mercurial-scm/hg: contrib/python-zstandard/zstd/decompress/zstd_decompress

annotate contrib/python-zstandard/zstd/decompress/zstd_decompress_block.c @ 42937:69de49c4e39c

zstandard: vendor python-zstandard 0.12 The upstream source distribution from PyPI was extracted. Unwanted files were removed. The clang-format ignore list was updated to reflect the new source of files. test-repo-compengines.t was updated to reflect a change in behavior of the zstd library. The project contains a vendored copy of zstandard 1.4.3. The old version was 1.3.8. This should result in some minor performance wins. # no-check-commit because 3rd party code has different style guidelines Differential Revision: https://phab.mercurial-scm.org/D6858

author	Gregory Szorc <gregory.szorc@gmail.com>
date	Sun, 15 Sep 2019 20:04:00 -0700
parents	675775c33ab6
children	de7838053207

rev	line source
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1 /*
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	2 * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	3 * All rights reserved.
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	4 *
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	5 * This source code is licensed under both the BSD-style license (found in the
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	6 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	7 * in the COPYING file in the root directory of this source tree).
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	8 * You may select, at your option, one of the above-listed licenses.
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	9 */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	10
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	11 /* zstd_decompress_block :
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	12 * this module takes care of decompressing _compressed_ block */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	13
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	14 /-******************************************************
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	15 * Dependencies
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	16 *********************************************************/
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	17 #include <string.h> /* memcpy, memmove, memset */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	18 #include "compiler.h" /* prefetch */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	19 #include "cpu.h" /* bmi2 */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	20 #include "mem.h" /* low level memory routines */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	21 #define FSE_STATIC_LINKING_ONLY
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	22 #include "fse.h"
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	23 #define HUF_STATIC_LINKING_ONLY
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	24 #include "huf.h"
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	25 #include "zstd_internal.h"
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	26 #include "zstd_decompress_internal.h" /* ZSTD_DCtx */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	27 #include "zstd_ddict.h" /* ZSTD_DDictDictContent */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	28 #include "zstd_decompress_block.h"
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	29
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	30 /_******************************************************
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	31 * Macros
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	32 **********************************************************/
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	33
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	34 /* These two optional macros force the use one way or another of the two
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	35 * ZSTD_decompressSequences implementations. You can't force in both directions
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	36 * at the same time.
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	37 */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	38 #if defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT) && \
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	39 defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	40 #error "Cannot force the use of the short and the long ZSTD_decompressSequences variants!"
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	41 #endif
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	42
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	43
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	44 /_******************************************************
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	45 * Memory operations
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	46 **********************************************************/
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	47 static void ZSTD_copy4(void* dst, const void* src) { memcpy(dst, src, 4); }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	48
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	49
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	50 /-************************************************************
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	51 * Block decoding
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	52 ***************************************************************/
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	53
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	54 /*! ZSTD_getcBlockSize() :
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	55 * Provides the size of compressed block from block header `src` */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	56 size_t ZSTD_getcBlockSize(const void* src, size_t srcSize,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	57 blockProperties_t* bpPtr)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	58 {
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	59 RETURN_ERROR_IF(srcSize < ZSTD_blockHeaderSize, srcSize_wrong);
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	60
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	61 { U32 const cBlockHeader = MEM_readLE24(src);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	62 U32 const cSize = cBlockHeader >> 3;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	63 bpPtr->lastBlock = cBlockHeader & 1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	64 bpPtr->blockType = (blockType_e)((cBlockHeader >> 1) & 3);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	65 bpPtr->origSize = cSize; /* only useful for RLE */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	66 if (bpPtr->blockType == bt_rle) return 1;
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	67 RETURN_ERROR_IF(bpPtr->blockType == bt_reserved, corruption_detected);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	68 return cSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	69 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	70 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	71
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	72
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	73 /* Hidden declaration for fullbench */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	74 size_t ZSTD_decodeLiteralsBlock(ZSTD_DCtx* dctx,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	75 const void* src, size_t srcSize);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	76 /*! ZSTD_decodeLiteralsBlock() :
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	77 * @return : nb of bytes read from src (< srcSize )
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	78 * note : symbol not declared but exposed for fullbench */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	79 size_t ZSTD_decodeLiteralsBlock(ZSTD_DCtx* dctx,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	80 const void* src, size_t srcSize) /* note : srcSize < BLOCKSIZE */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	81 {
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	82 DEBUGLOG(5, "ZSTD_decodeLiteralsBlock");
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	83 RETURN_ERROR_IF(srcSize < MIN_CBLOCK_SIZE, corruption_detected);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	84
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	85 { const BYTE* const istart = (const BYTE*) src;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	86 symbolEncodingType_e const litEncType = (symbolEncodingType_e)(istart[0] & 3);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	87
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	88 switch(litEncType)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	89 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	90 case set_repeat:
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	91 DEBUGLOG(5, "set_repeat flag : re-using stats from previous compressed literals block");
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	92 RETURN_ERROR_IF(dctx->litEntropy==0, dictionary_corrupted);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	93 /* fall-through */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	94
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	95 case set_compressed:
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	96 RETURN_ERROR_IF(srcSize < 5, corruption_detected, "srcSize >= MIN_CBLOCK_SIZE == 3; here we need up to 5 for case 3");
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	97 { size_t lhSize, litSize, litCSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	98 U32 singleStream=0;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	99 U32 const lhlCode = (istart[0] >> 2) & 3;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	100 U32 const lhc = MEM_readLE32(istart);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	101 size_t hufSuccess;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	102 switch(lhlCode)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	103 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	104 case 0: case 1: default: /* note : default is impossible, since lhlCode into [0..3] */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	105 /* 2 - 2 - 10 - 10 */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	106 singleStream = !lhlCode;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	107 lhSize = 3;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	108 litSize = (lhc >> 4) & 0x3FF;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	109 litCSize = (lhc >> 14) & 0x3FF;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	110 break;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	111 case 2:
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	112 /* 2 - 2 - 14 - 14 */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	113 lhSize = 4;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	114 litSize = (lhc >> 4) & 0x3FFF;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	115 litCSize = lhc >> 18;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	116 break;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	117 case 3:
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	118 /* 2 - 2 - 18 - 18 */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	119 lhSize = 5;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	120 litSize = (lhc >> 4) & 0x3FFFF;
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	121 litCSize = (lhc >> 22) + ((size_t)istart[4] << 10);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	122 break;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	123 }
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	124 RETURN_ERROR_IF(litSize > ZSTD_BLOCKSIZE_MAX, corruption_detected);
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	125 RETURN_ERROR_IF(litCSize + lhSize > srcSize, corruption_detected);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	126
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	127 /* prefetch huffman table if cold */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	128 if (dctx->ddictIsCold && (litSize > 768 /* heuristic */)) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	129 PREFETCH_AREA(dctx->HUFptr, sizeof(dctx->entropy.hufTable));
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	130 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	131
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	132 if (litEncType==set_repeat) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	133 if (singleStream) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	134 hufSuccess = HUF_decompress1X_usingDTable_bmi2(
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	135 dctx->litBuffer, litSize, istart+lhSize, litCSize,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	136 dctx->HUFptr, dctx->bmi2);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	137 } else {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	138 hufSuccess = HUF_decompress4X_usingDTable_bmi2(
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	139 dctx->litBuffer, litSize, istart+lhSize, litCSize,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	140 dctx->HUFptr, dctx->bmi2);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	141 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	142 } else {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	143 if (singleStream) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	144 #if defined(HUF_FORCE_DECOMPRESS_X2)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	145 hufSuccess = HUF_decompress1X_DCtx_wksp(
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	146 dctx->entropy.hufTable, dctx->litBuffer, litSize,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	147 istart+lhSize, litCSize, dctx->workspace,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	148 sizeof(dctx->workspace));
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	149 #else
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	150 hufSuccess = HUF_decompress1X1_DCtx_wksp_bmi2(
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	151 dctx->entropy.hufTable, dctx->litBuffer, litSize,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	152 istart+lhSize, litCSize, dctx->workspace,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	153 sizeof(dctx->workspace), dctx->bmi2);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	154 #endif
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	155 } else {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	156 hufSuccess = HUF_decompress4X_hufOnly_wksp_bmi2(
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	157 dctx->entropy.hufTable, dctx->litBuffer, litSize,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	158 istart+lhSize, litCSize, dctx->workspace,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	159 sizeof(dctx->workspace), dctx->bmi2);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	160 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	161 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	162
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	163 RETURN_ERROR_IF(HUF_isError(hufSuccess), corruption_detected);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	164
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	165 dctx->litPtr = dctx->litBuffer;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	166 dctx->litSize = litSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	167 dctx->litEntropy = 1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	168 if (litEncType==set_compressed) dctx->HUFptr = dctx->entropy.hufTable;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	169 memset(dctx->litBuffer + dctx->litSize, 0, WILDCOPY_OVERLENGTH);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	170 return litCSize + lhSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	171 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	172
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	173 case set_basic:
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	174 { size_t litSize, lhSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	175 U32 const lhlCode = ((istart[0]) >> 2) & 3;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	176 switch(lhlCode)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	177 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	178 case 0: case 2: default: /* note : default is impossible, since lhlCode into [0..3] */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	179 lhSize = 1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	180 litSize = istart[0] >> 3;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	181 break;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	182 case 1:
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	183 lhSize = 2;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	184 litSize = MEM_readLE16(istart) >> 4;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	185 break;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	186 case 3:
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	187 lhSize = 3;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	188 litSize = MEM_readLE24(istart) >> 4;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	189 break;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	190 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	191
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	192 if (lhSize+litSize+WILDCOPY_OVERLENGTH > srcSize) { /* risk reading beyond src buffer with wildcopy */
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	193 RETURN_ERROR_IF(litSize+lhSize > srcSize, corruption_detected);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	194 memcpy(dctx->litBuffer, istart+lhSize, litSize);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	195 dctx->litPtr = dctx->litBuffer;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	196 dctx->litSize = litSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	197 memset(dctx->litBuffer + dctx->litSize, 0, WILDCOPY_OVERLENGTH);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	198 return lhSize+litSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	199 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	200 /* direct reference into compressed stream */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	201 dctx->litPtr = istart+lhSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	202 dctx->litSize = litSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	203 return lhSize+litSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	204 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	205
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	206 case set_rle:
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	207 { U32 const lhlCode = ((istart[0]) >> 2) & 3;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	208 size_t litSize, lhSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	209 switch(lhlCode)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	210 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	211 case 0: case 2: default: /* note : default is impossible, since lhlCode into [0..3] */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	212 lhSize = 1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	213 litSize = istart[0] >> 3;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	214 break;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	215 case 1:
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	216 lhSize = 2;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	217 litSize = MEM_readLE16(istart) >> 4;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	218 break;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	219 case 3:
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	220 lhSize = 3;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	221 litSize = MEM_readLE24(istart) >> 4;
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	222 RETURN_ERROR_IF(srcSize<4, corruption_detected, "srcSize >= MIN_CBLOCK_SIZE == 3; here we need lhSize+1 = 4");
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	223 break;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	224 }
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	225 RETURN_ERROR_IF(litSize > ZSTD_BLOCKSIZE_MAX, corruption_detected);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	226 memset(dctx->litBuffer, istart[lhSize], litSize + WILDCOPY_OVERLENGTH);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	227 dctx->litPtr = dctx->litBuffer;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	228 dctx->litSize = litSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	229 return lhSize+1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	230 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	231 default:
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	232 RETURN_ERROR(corruption_detected, "impossible");
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	233 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	234 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	235 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	236
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	237 /* Default FSE distribution tables.
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	238 * These are pre-calculated FSE decoding tables using default distributions as defined in specification :
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	239 * https://github.com/facebook/zstd/blob/master/doc/zstd_compression_format.md#default-distributions
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	240 * They were generated programmatically with following method :
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	241 * - start from default distributions, present in /lib/common/zstd_internal.h
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	242 * - generate tables normally, using ZSTD_buildFSETable()
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	243 * - printout the content of tables
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	244 * - pretify output, report below, test with fuzzer to ensure it's correct */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	245
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	246 /* Default FSE distribution table for Literal Lengths */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	247 static const ZSTD_seqSymbol LL_defaultDTable[(1<<LL_DEFAULTNORMLOG)+1] = {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	248 { 1, 1, 1, LL_DEFAULTNORMLOG}, /* header : fastMode, tableLog */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	249 /* nextState, nbAddBits, nbBits, baseVal */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	250 { 0, 0, 4, 0}, { 16, 0, 4, 0},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	251 { 32, 0, 5, 1}, { 0, 0, 5, 3},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	252 { 0, 0, 5, 4}, { 0, 0, 5, 6},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	253 { 0, 0, 5, 7}, { 0, 0, 5, 9},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	254 { 0, 0, 5, 10}, { 0, 0, 5, 12},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	255 { 0, 0, 6, 14}, { 0, 1, 5, 16},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	256 { 0, 1, 5, 20}, { 0, 1, 5, 22},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	257 { 0, 2, 5, 28}, { 0, 3, 5, 32},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	258 { 0, 4, 5, 48}, { 32, 6, 5, 64},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	259 { 0, 7, 5, 128}, { 0, 8, 6, 256},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	260 { 0, 10, 6, 1024}, { 0, 12, 6, 4096},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	261 { 32, 0, 4, 0}, { 0, 0, 4, 1},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	262 { 0, 0, 5, 2}, { 32, 0, 5, 4},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	263 { 0, 0, 5, 5}, { 32, 0, 5, 7},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	264 { 0, 0, 5, 8}, { 32, 0, 5, 10},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	265 { 0, 0, 5, 11}, { 0, 0, 6, 13},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	266 { 32, 1, 5, 16}, { 0, 1, 5, 18},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	267 { 32, 1, 5, 22}, { 0, 2, 5, 24},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	268 { 32, 3, 5, 32}, { 0, 3, 5, 40},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	269 { 0, 6, 4, 64}, { 16, 6, 4, 64},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	270 { 32, 7, 5, 128}, { 0, 9, 6, 512},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	271 { 0, 11, 6, 2048}, { 48, 0, 4, 0},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	272 { 16, 0, 4, 1}, { 32, 0, 5, 2},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	273 { 32, 0, 5, 3}, { 32, 0, 5, 5},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	274 { 32, 0, 5, 6}, { 32, 0, 5, 8},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	275 { 32, 0, 5, 9}, { 32, 0, 5, 11},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	276 { 32, 0, 5, 12}, { 0, 0, 6, 15},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	277 { 32, 1, 5, 18}, { 32, 1, 5, 20},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	278 { 32, 2, 5, 24}, { 32, 2, 5, 28},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	279 { 32, 3, 5, 40}, { 32, 4, 5, 48},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	280 { 0, 16, 6,65536}, { 0, 15, 6,32768},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	281 { 0, 14, 6,16384}, { 0, 13, 6, 8192},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	282 }; /* LL_defaultDTable */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	283
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	284 /* Default FSE distribution table for Offset Codes */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	285 static const ZSTD_seqSymbol OF_defaultDTable[(1<<OF_DEFAULTNORMLOG)+1] = {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	286 { 1, 1, 1, OF_DEFAULTNORMLOG}, /* header : fastMode, tableLog */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	287 /* nextState, nbAddBits, nbBits, baseVal */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	288 { 0, 0, 5, 0}, { 0, 6, 4, 61},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	289 { 0, 9, 5, 509}, { 0, 15, 5,32765},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	290 { 0, 21, 5,2097149}, { 0, 3, 5, 5},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	291 { 0, 7, 4, 125}, { 0, 12, 5, 4093},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	292 { 0, 18, 5,262141}, { 0, 23, 5,8388605},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	293 { 0, 5, 5, 29}, { 0, 8, 4, 253},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	294 { 0, 14, 5,16381}, { 0, 20, 5,1048573},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	295 { 0, 2, 5, 1}, { 16, 7, 4, 125},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	296 { 0, 11, 5, 2045}, { 0, 17, 5,131069},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	297 { 0, 22, 5,4194301}, { 0, 4, 5, 13},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	298 { 16, 8, 4, 253}, { 0, 13, 5, 8189},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	299 { 0, 19, 5,524285}, { 0, 1, 5, 1},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	300 { 16, 6, 4, 61}, { 0, 10, 5, 1021},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	301 { 0, 16, 5,65533}, { 0, 28, 5,268435453},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	302 { 0, 27, 5,134217725}, { 0, 26, 5,67108861},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	303 { 0, 25, 5,33554429}, { 0, 24, 5,16777213},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	304 }; /* OF_defaultDTable */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	305
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	306
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	307 /* Default FSE distribution table for Match Lengths */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	308 static const ZSTD_seqSymbol ML_defaultDTable[(1<<ML_DEFAULTNORMLOG)+1] = {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	309 { 1, 1, 1, ML_DEFAULTNORMLOG}, /* header : fastMode, tableLog */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	310 /* nextState, nbAddBits, nbBits, baseVal */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	311 { 0, 0, 6, 3}, { 0, 0, 4, 4},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	312 { 32, 0, 5, 5}, { 0, 0, 5, 6},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	313 { 0, 0, 5, 8}, { 0, 0, 5, 9},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	314 { 0, 0, 5, 11}, { 0, 0, 6, 13},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	315 { 0, 0, 6, 16}, { 0, 0, 6, 19},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	316 { 0, 0, 6, 22}, { 0, 0, 6, 25},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	317 { 0, 0, 6, 28}, { 0, 0, 6, 31},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	318 { 0, 0, 6, 34}, { 0, 1, 6, 37},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	319 { 0, 1, 6, 41}, { 0, 2, 6, 47},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	320 { 0, 3, 6, 59}, { 0, 4, 6, 83},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	321 { 0, 7, 6, 131}, { 0, 9, 6, 515},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	322 { 16, 0, 4, 4}, { 0, 0, 4, 5},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	323 { 32, 0, 5, 6}, { 0, 0, 5, 7},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	324 { 32, 0, 5, 9}, { 0, 0, 5, 10},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	325 { 0, 0, 6, 12}, { 0, 0, 6, 15},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	326 { 0, 0, 6, 18}, { 0, 0, 6, 21},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	327 { 0, 0, 6, 24}, { 0, 0, 6, 27},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	328 { 0, 0, 6, 30}, { 0, 0, 6, 33},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	329 { 0, 1, 6, 35}, { 0, 1, 6, 39},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	330 { 0, 2, 6, 43}, { 0, 3, 6, 51},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	331 { 0, 4, 6, 67}, { 0, 5, 6, 99},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	332 { 0, 8, 6, 259}, { 32, 0, 4, 4},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	333 { 48, 0, 4, 4}, { 16, 0, 4, 5},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	334 { 32, 0, 5, 7}, { 32, 0, 5, 8},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	335 { 32, 0, 5, 10}, { 32, 0, 5, 11},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	336 { 0, 0, 6, 14}, { 0, 0, 6, 17},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	337 { 0, 0, 6, 20}, { 0, 0, 6, 23},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	338 { 0, 0, 6, 26}, { 0, 0, 6, 29},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	339 { 0, 0, 6, 32}, { 0, 16, 6,65539},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	340 { 0, 15, 6,32771}, { 0, 14, 6,16387},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	341 { 0, 13, 6, 8195}, { 0, 12, 6, 4099},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	342 { 0, 11, 6, 2051}, { 0, 10, 6, 1027},
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	343 }; /* ML_defaultDTable */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	344
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	345
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	346 static void ZSTD_buildSeqTable_rle(ZSTD_seqSymbol* dt, U32 baseValue, U32 nbAddBits)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	347 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	348 void* ptr = dt;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	349 ZSTD_seqSymbol_header* const DTableH = (ZSTD_seqSymbol_header*)ptr;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	350 ZSTD_seqSymbol* const cell = dt + 1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	351
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	352 DTableH->tableLog = 0;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	353 DTableH->fastMode = 0;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	354
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	355 cell->nbBits = 0;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	356 cell->nextState = 0;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	357 assert(nbAddBits < 255);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	358 cell->nbAdditionalBits = (BYTE)nbAddBits;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	359 cell->baseValue = baseValue;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	360 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	361
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	362
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	363 /* ZSTD_buildFSETable() :
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	364 * generate FSE decoding table for one symbol (ll, ml or off)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	365 * cannot fail if input is valid =>
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	366 * all inputs are presumed validated at this stage */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	367 void
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	368 ZSTD_buildFSETable(ZSTD_seqSymbol* dt,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	369 const short* normalizedCounter, unsigned maxSymbolValue,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	370 const U32* baseValue, const U32* nbAdditionalBits,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	371 unsigned tableLog)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	372 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	373 ZSTD_seqSymbol* const tableDecode = dt+1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	374 U16 symbolNext[MaxSeq+1];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	375
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	376 U32 const maxSV1 = maxSymbolValue + 1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	377 U32 const tableSize = 1 << tableLog;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	378 U32 highThreshold = tableSize-1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	379
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	380 /* Sanity Checks */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	381 assert(maxSymbolValue <= MaxSeq);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	382 assert(tableLog <= MaxFSELog);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	383
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	384 /* Init, lay down lowprob symbols */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	385 { ZSTD_seqSymbol_header DTableH;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	386 DTableH.tableLog = tableLog;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	387 DTableH.fastMode = 1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	388 { S16 const largeLimit= (S16)(1 << (tableLog-1));
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	389 U32 s;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	390 for (s=0; s<maxSV1; s++) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	391 if (normalizedCounter[s]==-1) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	392 tableDecode[highThreshold--].baseValue = s;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	393 symbolNext[s] = 1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	394 } else {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	395 if (normalizedCounter[s] >= largeLimit) DTableH.fastMode=0;
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	396 assert(normalizedCounter[s]>=0);
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	397 symbolNext[s] = (U16)normalizedCounter[s];
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	398 } } }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	399 memcpy(dt, &DTableH, sizeof(DTableH));
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	400 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	401
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	402 /* Spread symbols */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	403 { U32 const tableMask = tableSize-1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	404 U32 const step = FSE_TABLESTEP(tableSize);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	405 U32 s, position = 0;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	406 for (s=0; s<maxSV1; s++) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	407 int i;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	408 for (i=0; i<normalizedCounter[s]; i++) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	409 tableDecode[position].baseValue = s;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	410 position = (position + step) & tableMask;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	411 while (position > highThreshold) position = (position + step) & tableMask; /* lowprob area */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	412 } }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	413 assert(position == 0); /* position must reach all cells once, otherwise normalizedCounter is incorrect */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	414 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	415
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	416 /* Build Decoding table */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	417 { U32 u;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	418 for (u=0; u<tableSize; u++) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	419 U32 const symbol = tableDecode[u].baseValue;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	420 U32 const nextState = symbolNext[symbol]++;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	421 tableDecode[u].nbBits = (BYTE) (tableLog - BIT_highbit32(nextState) );
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	422 tableDecode[u].nextState = (U16) ( (nextState << tableDecode[u].nbBits) - tableSize);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	423 assert(nbAdditionalBits[symbol] < 255);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	424 tableDecode[u].nbAdditionalBits = (BYTE)nbAdditionalBits[symbol];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	425 tableDecode[u].baseValue = baseValue[symbol];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	426 } }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	427 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	428
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	429
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	430 /*! ZSTD_buildSeqTable() :
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	431 * @return : nb bytes read from src,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	432 * or an error code if it fails */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	433 static size_t ZSTD_buildSeqTable(ZSTD_seqSymbol* DTableSpace, const ZSTD_seqSymbol** DTablePtr,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	434 symbolEncodingType_e type, unsigned max, U32 maxLog,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	435 const void* src, size_t srcSize,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	436 const U32* baseValue, const U32* nbAdditionalBits,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	437 const ZSTD_seqSymbol* defaultTable, U32 flagRepeatTable,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	438 int ddictIsCold, int nbSeq)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	439 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	440 switch(type)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	441 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	442 case set_rle :
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	443 RETURN_ERROR_IF(!srcSize, srcSize_wrong);
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	444 RETURN_ERROR_IF(((const BYTE)src) > max, corruption_detected);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	445 { U32 const symbol = (const BYTE)src;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	446 U32 const baseline = baseValue[symbol];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	447 U32 const nbBits = nbAdditionalBits[symbol];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	448 ZSTD_buildSeqTable_rle(DTableSpace, baseline, nbBits);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	449 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	450 *DTablePtr = DTableSpace;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	451 return 1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	452 case set_basic :
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	453 *DTablePtr = defaultTable;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	454 return 0;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	455 case set_repeat:
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	456 RETURN_ERROR_IF(!flagRepeatTable, corruption_detected);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	457 /* prefetch FSE table if used */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	458 if (ddictIsCold && (nbSeq > 24 /* heuristic */)) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	459 const void* const pStart = *DTablePtr;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	460 size_t const pSize = sizeof(ZSTD_seqSymbol) * (SEQSYMBOL_TABLE_SIZE(maxLog));
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	461 PREFETCH_AREA(pStart, pSize);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	462 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	463 return 0;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	464 case set_compressed :
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	465 { unsigned tableLog;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	466 S16 norm[MaxSeq+1];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	467 size_t const headerSize = FSE_readNCount(norm, &max, &tableLog, src, srcSize);
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	468 RETURN_ERROR_IF(FSE_isError(headerSize), corruption_detected);
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	469 RETURN_ERROR_IF(tableLog > maxLog, corruption_detected);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	470 ZSTD_buildFSETable(DTableSpace, norm, max, baseValue, nbAdditionalBits, tableLog);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	471 *DTablePtr = DTableSpace;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	472 return headerSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	473 }
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	474 default :
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	475 assert(0);
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	476 RETURN_ERROR(GENERIC, "impossible");
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	477 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	478 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	479
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	480 size_t ZSTD_decodeSeqHeaders(ZSTD_DCtx* dctx, int* nbSeqPtr,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	481 const void* src, size_t srcSize)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	482 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	483 const BYTE* const istart = (const BYTE* const)src;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	484 const BYTE* const iend = istart + srcSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	485 const BYTE* ip = istart;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	486 int nbSeq;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	487 DEBUGLOG(5, "ZSTD_decodeSeqHeaders");
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	488
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	489 /* check */
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	490 RETURN_ERROR_IF(srcSize < MIN_SEQUENCES_SIZE, srcSize_wrong);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	491
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	492 /* SeqHead */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	493 nbSeq = *ip++;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	494 if (!nbSeq) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	495 *nbSeqPtr=0;
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	496 RETURN_ERROR_IF(srcSize != 1, srcSize_wrong);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	497 return 1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	498 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	499 if (nbSeq > 0x7F) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	500 if (nbSeq == 0xFF) {
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	501 RETURN_ERROR_IF(ip+2 > iend, srcSize_wrong);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	502 nbSeq = MEM_readLE16(ip) + LONGNBSEQ, ip+=2;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	503 } else {
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	504 RETURN_ERROR_IF(ip >= iend, srcSize_wrong);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	505 nbSeq = ((nbSeq-0x80)<<8) + *ip++;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	506 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	507 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	508 *nbSeqPtr = nbSeq;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	509
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	510 /* FSE table descriptors */
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	511 RETURN_ERROR_IF(ip+1 > iend, srcSize_wrong); /* minimum possible size: 1 byte for symbol encoding types */
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	512 { symbolEncodingType_e const LLtype = (symbolEncodingType_e)(*ip >> 6);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	513 symbolEncodingType_e const OFtype = (symbolEncodingType_e)((*ip >> 4) & 3);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	514 symbolEncodingType_e const MLtype = (symbolEncodingType_e)((*ip >> 2) & 3);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	515 ip++;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	516
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	517 /* Build DTables */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	518 { size_t const llhSize = ZSTD_buildSeqTable(dctx->entropy.LLTable, &dctx->LLTptr,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	519 LLtype, MaxLL, LLFSELog,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	520 ip, iend-ip,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	521 LL_base, LL_bits,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	522 LL_defaultDTable, dctx->fseEntropy,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	523 dctx->ddictIsCold, nbSeq);
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	524 RETURN_ERROR_IF(ZSTD_isError(llhSize), corruption_detected);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	525 ip += llhSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	526 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	527
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	528 { size_t const ofhSize = ZSTD_buildSeqTable(dctx->entropy.OFTable, &dctx->OFTptr,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	529 OFtype, MaxOff, OffFSELog,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	530 ip, iend-ip,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	531 OF_base, OF_bits,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	532 OF_defaultDTable, dctx->fseEntropy,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	533 dctx->ddictIsCold, nbSeq);
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	534 RETURN_ERROR_IF(ZSTD_isError(ofhSize), corruption_detected);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	535 ip += ofhSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	536 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	537
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	538 { size_t const mlhSize = ZSTD_buildSeqTable(dctx->entropy.MLTable, &dctx->MLTptr,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	539 MLtype, MaxML, MLFSELog,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	540 ip, iend-ip,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	541 ML_base, ML_bits,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	542 ML_defaultDTable, dctx->fseEntropy,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	543 dctx->ddictIsCold, nbSeq);
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	544 RETURN_ERROR_IF(ZSTD_isError(mlhSize), corruption_detected);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	545 ip += mlhSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	546 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	547 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	548
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	549 return ip-istart;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	550 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	551
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	552
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	553 typedef struct {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	554 size_t litLength;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	555 size_t matchLength;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	556 size_t offset;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	557 const BYTE* match;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	558 } seq_t;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	559
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	560 typedef struct {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	561 size_t state;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	562 const ZSTD_seqSymbol* table;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	563 } ZSTD_fseState;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	564
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	565 typedef struct {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	566 BIT_DStream_t DStream;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	567 ZSTD_fseState stateLL;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	568 ZSTD_fseState stateOffb;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	569 ZSTD_fseState stateML;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	570 size_t prevOffset[ZSTD_REP_NUM];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	571 const BYTE* prefixStart;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	572 const BYTE* dictEnd;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	573 size_t pos;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	574 } seqState_t;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	575
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	576
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	577 /* ZSTD_execSequenceLast7():
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	578 * exceptional case : decompress a match starting within last 7 bytes of output buffer.
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	579 * requires more careful checks, to ensure there is no overflow.
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	580 * performance does not matter though.
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	581 * note : this case is supposed to be never generated "naturally" by reference encoder,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	582 * since in most cases it needs at least 8 bytes to look for a match.
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	583 * but it's allowed by the specification. */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	584 FORCE_NOINLINE
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	585 size_t ZSTD_execSequenceLast7(BYTE* op,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	586 BYTE* const oend, seq_t sequence,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	587 const BYTE** litPtr, const BYTE* const litLimit,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	588 const BYTE* const base, const BYTE* const vBase, const BYTE* const dictEnd)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	589 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	590 BYTE* const oLitEnd = op + sequence.litLength;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	591 size_t const sequenceLength = sequence.litLength + sequence.matchLength;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	592 BYTE* const oMatchEnd = op + sequenceLength; /* risk : address space overflow (32-bits) */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	593 const BYTE* const iLitEnd = *litPtr + sequence.litLength;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	594 const BYTE* match = oLitEnd - sequence.offset;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	595
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	596 /* check */
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	597 RETURN_ERROR_IF(oMatchEnd>oend, dstSize_tooSmall, "last match must fit within dstBuffer");
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	598 RETURN_ERROR_IF(iLitEnd > litLimit, corruption_detected, "try to read beyond literal buffer");
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	599
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	600 /* copy literals */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	601 while (op < oLitEnd) op++ = (*litPtr)++;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	602
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	603 /* copy Match */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	604 if (sequence.offset > (size_t)(oLitEnd - base)) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	605 /* offset beyond prefix */
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	606 RETURN_ERROR_IF(sequence.offset > (size_t)(oLitEnd - vBase),corruption_detected);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	607 match = dictEnd - (base-match);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	608 if (match + sequence.matchLength <= dictEnd) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	609 memmove(oLitEnd, match, sequence.matchLength);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	610 return sequenceLength;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	611 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	612 /* span extDict & currentPrefixSegment */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	613 { size_t const length1 = dictEnd - match;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	614 memmove(oLitEnd, match, length1);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	615 op = oLitEnd + length1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	616 sequence.matchLength -= length1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	617 match = base;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	618 } }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	619 while (op < oMatchEnd) op++ = match++;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	620 return sequenceLength;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	621 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	622
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	623
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	624 HINT_INLINE
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	625 size_t ZSTD_execSequence(BYTE* op,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	626 BYTE* const oend, seq_t sequence,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	627 const BYTE** litPtr, const BYTE* const litLimit,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	628 const BYTE* const prefixStart, const BYTE* const virtualStart, const BYTE* const dictEnd)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	629 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	630 BYTE* const oLitEnd = op + sequence.litLength;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	631 size_t const sequenceLength = sequence.litLength + sequence.matchLength;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	632 BYTE* const oMatchEnd = op + sequenceLength; /* risk : address space overflow (32-bits) */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	633 BYTE* const oend_w = oend - WILDCOPY_OVERLENGTH;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	634 const BYTE* const iLitEnd = *litPtr + sequence.litLength;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	635 const BYTE* match = oLitEnd - sequence.offset;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	636
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	637 /* check */
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	638 RETURN_ERROR_IF(oMatchEnd>oend, dstSize_tooSmall, "last match must start at a minimum distance of WILDCOPY_OVERLENGTH from oend");
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	639 RETURN_ERROR_IF(iLitEnd > litLimit, corruption_detected, "over-read beyond lit buffer");
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	640 if (oLitEnd>oend_w) return ZSTD_execSequenceLast7(op, oend, sequence, litPtr, litLimit, prefixStart, virtualStart, dictEnd);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	641
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	642 /* copy Literals */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	643 if (sequence.litLength > 8)
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	644 ZSTD_wildcopy_16min(op, (litPtr), sequence.litLength, ZSTD_no_overlap); / note : since oLitEnd <= oend-WILDCOPY_OVERLENGTH, no risk of overwrite beyond oend */
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	645 else
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	646 ZSTD_copy8(op, *litPtr);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	647 op = oLitEnd;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	648 litPtr = iLitEnd; / update for next sequence */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	649
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	650 /* copy Match */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	651 if (sequence.offset > (size_t)(oLitEnd - prefixStart)) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	652 /* offset beyond prefix -> go into extDict */
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	653 RETURN_ERROR_IF(sequence.offset > (size_t)(oLitEnd - virtualStart), corruption_detected);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	654 match = dictEnd + (match - prefixStart);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	655 if (match + sequence.matchLength <= dictEnd) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	656 memmove(oLitEnd, match, sequence.matchLength);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	657 return sequenceLength;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	658 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	659 /* span extDict & currentPrefixSegment */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	660 { size_t const length1 = dictEnd - match;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	661 memmove(oLitEnd, match, length1);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	662 op = oLitEnd + length1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	663 sequence.matchLength -= length1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	664 match = prefixStart;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	665 if (op > oend_w \|\| sequence.matchLength < MINMATCH) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	666 U32 i;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	667 for (i = 0; i < sequence.matchLength; ++i) op[i] = match[i];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	668 return sequenceLength;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	669 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	670 } }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	671 /* Requirement: op <= oend_w && sequence.matchLength >= MINMATCH */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	672
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	673 /* match within prefix */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	674 if (sequence.offset < 8) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	675 /* close range match, overlap */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	676 static const U32 dec32table[] = { 0, 1, 2, 1, 4, 4, 4, 4 }; /* added */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	677 static const int dec64table[] = { 8, 8, 8, 7, 8, 9,10,11 }; /* subtracted */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	678 int const sub2 = dec64table[sequence.offset];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	679 op[0] = match[0];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	680 op[1] = match[1];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	681 op[2] = match[2];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	682 op[3] = match[3];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	683 match += dec32table[sequence.offset];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	684 ZSTD_copy4(op+4, match);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	685 match -= sub2;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	686 } else {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	687 ZSTD_copy8(op, match);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	688 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	689 op += 8; match += 8;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	690
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	691 if (oMatchEnd > oend-(16-MINMATCH)) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	692 if (op < oend_w) {
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	693 ZSTD_wildcopy(op, match, oend_w - op, ZSTD_overlap_src_before_dst);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	694 match += oend_w - op;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	695 op = oend_w;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	696 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	697 while (op < oMatchEnd) op++ = match++;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	698 } else {
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	699 ZSTD_wildcopy(op, match, (ptrdiff_t)sequence.matchLength-8, ZSTD_overlap_src_before_dst); /* works even if matchLength < 8 */
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	700 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	701 return sequenceLength;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	702 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	703
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	704
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	705 HINT_INLINE
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	706 size_t ZSTD_execSequenceLong(BYTE* op,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	707 BYTE* const oend, seq_t sequence,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	708 const BYTE** litPtr, const BYTE* const litLimit,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	709 const BYTE* const prefixStart, const BYTE* const dictStart, const BYTE* const dictEnd)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	710 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	711 BYTE* const oLitEnd = op + sequence.litLength;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	712 size_t const sequenceLength = sequence.litLength + sequence.matchLength;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	713 BYTE* const oMatchEnd = op + sequenceLength; /* risk : address space overflow (32-bits) */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	714 BYTE* const oend_w = oend - WILDCOPY_OVERLENGTH;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	715 const BYTE* const iLitEnd = *litPtr + sequence.litLength;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	716 const BYTE* match = sequence.match;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	717
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	718 /* check */
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	719 RETURN_ERROR_IF(oMatchEnd > oend, dstSize_tooSmall, "last match must start at a minimum distance of WILDCOPY_OVERLENGTH from oend");
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	720 RETURN_ERROR_IF(iLitEnd > litLimit, corruption_detected, "over-read beyond lit buffer");
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	721 if (oLitEnd > oend_w) return ZSTD_execSequenceLast7(op, oend, sequence, litPtr, litLimit, prefixStart, dictStart, dictEnd);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	722
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	723 /* copy Literals */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	724 if (sequence.litLength > 8)
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	725 ZSTD_wildcopy_16min(op, litPtr, sequence.litLength, ZSTD_no_overlap); / note : since oLitEnd <= oend-WILDCOPY_OVERLENGTH, no risk of overwrite beyond oend */
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	726 else
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	727 ZSTD_copy8(op, litPtr); / note : op <= oLitEnd <= oend_w == oend - 8 */
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	728
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	729 op = oLitEnd;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	730 litPtr = iLitEnd; / update for next sequence */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	731
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	732 /* copy Match */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	733 if (sequence.offset > (size_t)(oLitEnd - prefixStart)) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	734 /* offset beyond prefix */
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	735 RETURN_ERROR_IF(sequence.offset > (size_t)(oLitEnd - dictStart), corruption_detected);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	736 if (match + sequence.matchLength <= dictEnd) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	737 memmove(oLitEnd, match, sequence.matchLength);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	738 return sequenceLength;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	739 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	740 /* span extDict & currentPrefixSegment */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	741 { size_t const length1 = dictEnd - match;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	742 memmove(oLitEnd, match, length1);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	743 op = oLitEnd + length1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	744 sequence.matchLength -= length1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	745 match = prefixStart;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	746 if (op > oend_w \|\| sequence.matchLength < MINMATCH) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	747 U32 i;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	748 for (i = 0; i < sequence.matchLength; ++i) op[i] = match[i];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	749 return sequenceLength;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	750 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	751 } }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	752 assert(op <= oend_w);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	753 assert(sequence.matchLength >= MINMATCH);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	754
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	755 /* match within prefix */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	756 if (sequence.offset < 8) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	757 /* close range match, overlap */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	758 static const U32 dec32table[] = { 0, 1, 2, 1, 4, 4, 4, 4 }; /* added */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	759 static const int dec64table[] = { 8, 8, 8, 7, 8, 9,10,11 }; /* subtracted */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	760 int const sub2 = dec64table[sequence.offset];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	761 op[0] = match[0];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	762 op[1] = match[1];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	763 op[2] = match[2];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	764 op[3] = match[3];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	765 match += dec32table[sequence.offset];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	766 ZSTD_copy4(op+4, match);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	767 match -= sub2;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	768 } else {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	769 ZSTD_copy8(op, match);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	770 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	771 op += 8; match += 8;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	772
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	773 if (oMatchEnd > oend-(16-MINMATCH)) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	774 if (op < oend_w) {
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	775 ZSTD_wildcopy(op, match, oend_w - op, ZSTD_overlap_src_before_dst);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	776 match += oend_w - op;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	777 op = oend_w;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	778 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	779 while (op < oMatchEnd) op++ = match++;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	780 } else {
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	781 ZSTD_wildcopy(op, match, (ptrdiff_t)sequence.matchLength-8, ZSTD_overlap_src_before_dst); /* works even if matchLength < 8 */
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	782 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	783 return sequenceLength;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	784 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	785
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	786 static void
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	787 ZSTD_initFseState(ZSTD_fseState* DStatePtr, BIT_DStream_t* bitD, const ZSTD_seqSymbol* dt)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	788 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	789 const void* ptr = dt;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	790 const ZSTD_seqSymbol_header* const DTableH = (const ZSTD_seqSymbol_header*)ptr;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	791 DStatePtr->state = BIT_readBits(bitD, DTableH->tableLog);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	792 DEBUGLOG(6, "ZSTD_initFseState : val=%u using %u bits",
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	793 (U32)DStatePtr->state, DTableH->tableLog);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	794 BIT_reloadDStream(bitD);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	795 DStatePtr->table = dt + 1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	796 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	797
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	798 FORCE_INLINE_TEMPLATE void
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	799 ZSTD_updateFseState(ZSTD_fseState* DStatePtr, BIT_DStream_t* bitD)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	800 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	801 ZSTD_seqSymbol const DInfo = DStatePtr->table[DStatePtr->state];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	802 U32 const nbBits = DInfo.nbBits;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	803 size_t const lowBits = BIT_readBits(bitD, nbBits);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	804 DStatePtr->state = DInfo.nextState + lowBits;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	805 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	806
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	807 /* We need to add at most (ZSTD_WINDOWLOG_MAX_32 - 1) bits to read the maximum
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	808 * offset bits. But we can only read at most (STREAM_ACCUMULATOR_MIN_32 - 1)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	809 * bits before reloading. This value is the maximum number of bytes we read
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	810 * after reloading when we are decoding long offsets.
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	811 */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	812 #define LONG_OFFSETS_MAX_EXTRA_BITS_32 \
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	813 (ZSTD_WINDOWLOG_MAX_32 > STREAM_ACCUMULATOR_MIN_32 \
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	814 ? ZSTD_WINDOWLOG_MAX_32 - STREAM_ACCUMULATOR_MIN_32 \
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	815 : 0)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	816
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	817 typedef enum { ZSTD_lo_isRegularOffset, ZSTD_lo_isLongOffset=1 } ZSTD_longOffset_e;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	818
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	819 #ifndef ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	820 FORCE_INLINE_TEMPLATE seq_t
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	821 ZSTD_decodeSequence(seqState_t* seqState, const ZSTD_longOffset_e longOffsets)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	822 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	823 seq_t seq;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	824 U32 const llBits = seqState->stateLL.table[seqState->stateLL.state].nbAdditionalBits;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	825 U32 const mlBits = seqState->stateML.table[seqState->stateML.state].nbAdditionalBits;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	826 U32 const ofBits = seqState->stateOffb.table[seqState->stateOffb.state].nbAdditionalBits;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	827 U32 const totalBits = llBits+mlBits+ofBits;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	828 U32 const llBase = seqState->stateLL.table[seqState->stateLL.state].baseValue;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	829 U32 const mlBase = seqState->stateML.table[seqState->stateML.state].baseValue;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	830 U32 const ofBase = seqState->stateOffb.table[seqState->stateOffb.state].baseValue;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	831
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	832 /* sequence */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	833 { size_t offset;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	834 if (!ofBits)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	835 offset = 0;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	836 else {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	837 ZSTD_STATIC_ASSERT(ZSTD_lo_isLongOffset == 1);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	838 ZSTD_STATIC_ASSERT(LONG_OFFSETS_MAX_EXTRA_BITS_32 == 5);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	839 assert(ofBits <= MaxOff);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	840 if (MEM_32bits() && longOffsets && (ofBits >= STREAM_ACCUMULATOR_MIN_32)) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	841 U32 const extraBits = ofBits - MIN(ofBits, 32 - seqState->DStream.bitsConsumed);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	842 offset = ofBase + (BIT_readBitsFast(&seqState->DStream, ofBits - extraBits) << extraBits);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	843 BIT_reloadDStream(&seqState->DStream);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	844 if (extraBits) offset += BIT_readBitsFast(&seqState->DStream, extraBits);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	845 assert(extraBits <= LONG_OFFSETS_MAX_EXTRA_BITS_32); /* to avoid another reload */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	846 } else {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	847 offset = ofBase + BIT_readBitsFast(&seqState->DStream, ofBits/>0/); /* <= (ZSTD_WINDOWLOG_MAX-1) bits */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	848 if (MEM_32bits()) BIT_reloadDStream(&seqState->DStream);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	849 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	850 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	851
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	852 if (ofBits <= 1) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	853 offset += (llBase==0);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	854 if (offset) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	855 size_t temp = (offset==3) ? seqState->prevOffset[0] - 1 : seqState->prevOffset[offset];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	856 temp += !temp; /* 0 is not valid; input is corrupted; force offset to 1 */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	857 if (offset != 1) seqState->prevOffset[2] = seqState->prevOffset[1];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	858 seqState->prevOffset[1] = seqState->prevOffset[0];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	859 seqState->prevOffset[0] = offset = temp;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	860 } else { /* offset == 0 */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	861 offset = seqState->prevOffset[0];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	862 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	863 } else {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	864 seqState->prevOffset[2] = seqState->prevOffset[1];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	865 seqState->prevOffset[1] = seqState->prevOffset[0];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	866 seqState->prevOffset[0] = offset;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	867 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	868 seq.offset = offset;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	869 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	870
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	871 seq.matchLength = mlBase
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	872 + ((mlBits>0) ? BIT_readBitsFast(&seqState->DStream, mlBits/>0/) : 0); /* <= 16 bits */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	873 if (MEM_32bits() && (mlBits+llBits >= STREAM_ACCUMULATOR_MIN_32-LONG_OFFSETS_MAX_EXTRA_BITS_32))
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	874 BIT_reloadDStream(&seqState->DStream);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	875 if (MEM_64bits() && (totalBits >= STREAM_ACCUMULATOR_MIN_64-(LLFSELog+MLFSELog+OffFSELog)))
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	876 BIT_reloadDStream(&seqState->DStream);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	877 /* Ensure there are enough bits to read the rest of data in 64-bit mode. */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	878 ZSTD_STATIC_ASSERT(16+LLFSELog+MLFSELog+OffFSELog < STREAM_ACCUMULATOR_MIN_64);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	879
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	880 seq.litLength = llBase
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	881 + ((llBits>0) ? BIT_readBitsFast(&seqState->DStream, llBits/>0/) : 0); /* <= 16 bits */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	882 if (MEM_32bits())
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	883 BIT_reloadDStream(&seqState->DStream);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	884
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	885 DEBUGLOG(6, "seq: litL=%u, matchL=%u, offset=%u",
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	886 (U32)seq.litLength, (U32)seq.matchLength, (U32)seq.offset);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	887
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	888 /* ANS state update */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	889 ZSTD_updateFseState(&seqState->stateLL, &seqState->DStream); /* <= 9 bits */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	890 ZSTD_updateFseState(&seqState->stateML, &seqState->DStream); /* <= 9 bits */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	891 if (MEM_32bits()) BIT_reloadDStream(&seqState->DStream); /* <= 18 bits */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	892 ZSTD_updateFseState(&seqState->stateOffb, &seqState->DStream); /* <= 8 bits */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	893
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	894 return seq;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	895 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	896
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	897 FORCE_INLINE_TEMPLATE size_t
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	898 DONT_VECTORIZE
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	899 ZSTD_decompressSequences_body( ZSTD_DCtx* dctx,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	900 void* dst, size_t maxDstSize,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	901 const void* seqStart, size_t seqSize, int nbSeq,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	902 const ZSTD_longOffset_e isLongOffset)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	903 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	904 const BYTE* ip = (const BYTE*)seqStart;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	905 const BYTE* const iend = ip + seqSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	906 BYTE* const ostart = (BYTE* const)dst;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	907 BYTE* const oend = ostart + maxDstSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	908 BYTE* op = ostart;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	909 const BYTE* litPtr = dctx->litPtr;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	910 const BYTE* const litEnd = litPtr + dctx->litSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	911 const BYTE* const prefixStart = (const BYTE*) (dctx->prefixStart);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	912 const BYTE* const vBase = (const BYTE*) (dctx->virtualStart);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	913 const BYTE* const dictEnd = (const BYTE*) (dctx->dictEnd);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	914 DEBUGLOG(5, "ZSTD_decompressSequences_body");
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	915
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	916 /* Regen sequences */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	917 if (nbSeq) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	918 seqState_t seqState;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	919 dctx->fseEntropy = 1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	920 { U32 i; for (i=0; i<ZSTD_REP_NUM; i++) seqState.prevOffset[i] = dctx->entropy.rep[i]; }
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	921 RETURN_ERROR_IF(
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	922 ERR_isError(BIT_initDStream(&seqState.DStream, ip, iend-ip)),
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	923 corruption_detected);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	924 ZSTD_initFseState(&seqState.stateLL, &seqState.DStream, dctx->LLTptr);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	925 ZSTD_initFseState(&seqState.stateOffb, &seqState.DStream, dctx->OFTptr);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	926 ZSTD_initFseState(&seqState.stateML, &seqState.DStream, dctx->MLTptr);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	927
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	928 ZSTD_STATIC_ASSERT(
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	929 BIT_DStream_unfinished < BIT_DStream_completed &&
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	930 BIT_DStream_endOfBuffer < BIT_DStream_completed &&
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	931 BIT_DStream_completed < BIT_DStream_overflow);
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	932
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	933 for ( ; (BIT_reloadDStream(&(seqState.DStream)) <= BIT_DStream_completed) && nbSeq ; ) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	934 nbSeq--;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	935 { seq_t const sequence = ZSTD_decodeSequence(&seqState, isLongOffset);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	936 size_t const oneSeqSize = ZSTD_execSequence(op, oend, sequence, &litPtr, litEnd, prefixStart, vBase, dictEnd);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	937 DEBUGLOG(6, "regenerated sequence size : %u", (U32)oneSeqSize);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	938 if (ZSTD_isError(oneSeqSize)) return oneSeqSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	939 op += oneSeqSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	940 } }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	941
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	942 /* check if reached exact end */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	943 DEBUGLOG(5, "ZSTD_decompressSequences_body: after decode loop, remaining nbSeq : %i", nbSeq);
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	944 RETURN_ERROR_IF(nbSeq, corruption_detected);
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	945 RETURN_ERROR_IF(BIT_reloadDStream(&seqState.DStream) < BIT_DStream_completed, corruption_detected);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	946 /* save reps for next block */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	947 { U32 i; for (i=0; i<ZSTD_REP_NUM; i++) dctx->entropy.rep[i] = (U32)(seqState.prevOffset[i]); }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	948 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	949
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	950 /* last literal segment */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	951 { size_t const lastLLSize = litEnd - litPtr;
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	952 RETURN_ERROR_IF(lastLLSize > (size_t)(oend-op), dstSize_tooSmall);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	953 memcpy(op, litPtr, lastLLSize);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	954 op += lastLLSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	955 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	956
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	957 return op-ostart;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	958 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	959
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	960 static size_t
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	961 ZSTD_decompressSequences_default(ZSTD_DCtx* dctx,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	962 void* dst, size_t maxDstSize,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	963 const void* seqStart, size_t seqSize, int nbSeq,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	964 const ZSTD_longOffset_e isLongOffset)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	965 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	966 return ZSTD_decompressSequences_body(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	967 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	968 #endif /* ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	969
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	970
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	971
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	972 #ifndef ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	973 FORCE_INLINE_TEMPLATE seq_t
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	974 ZSTD_decodeSequenceLong(seqState_t* seqState, ZSTD_longOffset_e const longOffsets)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	975 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	976 seq_t seq;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	977 U32 const llBits = seqState->stateLL.table[seqState->stateLL.state].nbAdditionalBits;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	978 U32 const mlBits = seqState->stateML.table[seqState->stateML.state].nbAdditionalBits;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	979 U32 const ofBits = seqState->stateOffb.table[seqState->stateOffb.state].nbAdditionalBits;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	980 U32 const totalBits = llBits+mlBits+ofBits;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	981 U32 const llBase = seqState->stateLL.table[seqState->stateLL.state].baseValue;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	982 U32 const mlBase = seqState->stateML.table[seqState->stateML.state].baseValue;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	983 U32 const ofBase = seqState->stateOffb.table[seqState->stateOffb.state].baseValue;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	984
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	985 /* sequence */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	986 { size_t offset;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	987 if (!ofBits)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	988 offset = 0;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	989 else {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	990 ZSTD_STATIC_ASSERT(ZSTD_lo_isLongOffset == 1);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	991 ZSTD_STATIC_ASSERT(LONG_OFFSETS_MAX_EXTRA_BITS_32 == 5);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	992 assert(ofBits <= MaxOff);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	993 if (MEM_32bits() && longOffsets) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	994 U32 const extraBits = ofBits - MIN(ofBits, STREAM_ACCUMULATOR_MIN_32-1);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	995 offset = ofBase + (BIT_readBitsFast(&seqState->DStream, ofBits - extraBits) << extraBits);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	996 if (MEM_32bits() \|\| extraBits) BIT_reloadDStream(&seqState->DStream);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	997 if (extraBits) offset += BIT_readBitsFast(&seqState->DStream, extraBits);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	998 } else {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	999 offset = ofBase + BIT_readBitsFast(&seqState->DStream, ofBits); /* <= (ZSTD_WINDOWLOG_MAX-1) bits */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1000 if (MEM_32bits()) BIT_reloadDStream(&seqState->DStream);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1001 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1002 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1003
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1004 if (ofBits <= 1) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1005 offset += (llBase==0);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1006 if (offset) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1007 size_t temp = (offset==3) ? seqState->prevOffset[0] - 1 : seqState->prevOffset[offset];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1008 temp += !temp; /* 0 is not valid; input is corrupted; force offset to 1 */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1009 if (offset != 1) seqState->prevOffset[2] = seqState->prevOffset[1];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1010 seqState->prevOffset[1] = seqState->prevOffset[0];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1011 seqState->prevOffset[0] = offset = temp;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1012 } else {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1013 offset = seqState->prevOffset[0];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1014 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1015 } else {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1016 seqState->prevOffset[2] = seqState->prevOffset[1];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1017 seqState->prevOffset[1] = seqState->prevOffset[0];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1018 seqState->prevOffset[0] = offset;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1019 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1020 seq.offset = offset;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1021 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1022
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1023 seq.matchLength = mlBase + ((mlBits>0) ? BIT_readBitsFast(&seqState->DStream, mlBits) : 0); /* <= 16 bits */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1024 if (MEM_32bits() && (mlBits+llBits >= STREAM_ACCUMULATOR_MIN_32-LONG_OFFSETS_MAX_EXTRA_BITS_32))
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1025 BIT_reloadDStream(&seqState->DStream);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1026 if (MEM_64bits() && (totalBits >= STREAM_ACCUMULATOR_MIN_64-(LLFSELog+MLFSELog+OffFSELog)))
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1027 BIT_reloadDStream(&seqState->DStream);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1028 /* Verify that there is enough bits to read the rest of the data in 64-bit mode. */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1029 ZSTD_STATIC_ASSERT(16+LLFSELog+MLFSELog+OffFSELog < STREAM_ACCUMULATOR_MIN_64);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1030
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1031 seq.litLength = llBase + ((llBits>0) ? BIT_readBitsFast(&seqState->DStream, llBits) : 0); /* <= 16 bits */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1032 if (MEM_32bits())
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1033 BIT_reloadDStream(&seqState->DStream);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1034
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1035 { size_t const pos = seqState->pos + seq.litLength;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1036 const BYTE* const matchBase = (seq.offset > pos) ? seqState->dictEnd : seqState->prefixStart;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1037 seq.match = matchBase + pos - seq.offset; /* note : this operation can overflow when seq.offset is really too large, which can only happen when input is corrupted.
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1038 * No consequence though : no memory access will occur, overly large offset will be detected in ZSTD_execSequenceLong() */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1039 seqState->pos = pos + seq.matchLength;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1040 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1041
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1042 /* ANS state update */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1043 ZSTD_updateFseState(&seqState->stateLL, &seqState->DStream); /* <= 9 bits */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1044 ZSTD_updateFseState(&seqState->stateML, &seqState->DStream); /* <= 9 bits */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1045 if (MEM_32bits()) BIT_reloadDStream(&seqState->DStream); /* <= 18 bits */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1046 ZSTD_updateFseState(&seqState->stateOffb, &seqState->DStream); /* <= 8 bits */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1047
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1048 return seq;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1049 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1050
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1051 FORCE_INLINE_TEMPLATE size_t
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1052 ZSTD_decompressSequencesLong_body(
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1053 ZSTD_DCtx* dctx,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1054 void* dst, size_t maxDstSize,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1055 const void* seqStart, size_t seqSize, int nbSeq,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1056 const ZSTD_longOffset_e isLongOffset)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1057 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1058 const BYTE* ip = (const BYTE*)seqStart;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1059 const BYTE* const iend = ip + seqSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1060 BYTE* const ostart = (BYTE* const)dst;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1061 BYTE* const oend = ostart + maxDstSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1062 BYTE* op = ostart;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1063 const BYTE* litPtr = dctx->litPtr;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1064 const BYTE* const litEnd = litPtr + dctx->litSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1065 const BYTE* const prefixStart = (const BYTE*) (dctx->prefixStart);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1066 const BYTE* const dictStart = (const BYTE*) (dctx->virtualStart);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1067 const BYTE* const dictEnd = (const BYTE*) (dctx->dictEnd);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1068
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1069 /* Regen sequences */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1070 if (nbSeq) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1071 #define STORED_SEQS 4
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1072 #define STORED_SEQS_MASK (STORED_SEQS-1)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1073 #define ADVANCED_SEQS 4
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1074 seq_t sequences[STORED_SEQS];
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1075 int const seqAdvance = MIN(nbSeq, ADVANCED_SEQS);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1076 seqState_t seqState;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1077 int seqNb;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1078 dctx->fseEntropy = 1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1079 { int i; for (i=0; i<ZSTD_REP_NUM; i++) seqState.prevOffset[i] = dctx->entropy.rep[i]; }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1080 seqState.prefixStart = prefixStart;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1081 seqState.pos = (size_t)(op-prefixStart);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1082 seqState.dictEnd = dictEnd;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1083 assert(iend >= ip);
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	1084 RETURN_ERROR_IF(
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	1085 ERR_isError(BIT_initDStream(&seqState.DStream, ip, iend-ip)),
69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	1086 corruption_detected);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1087 ZSTD_initFseState(&seqState.stateLL, &seqState.DStream, dctx->LLTptr);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1088 ZSTD_initFseState(&seqState.stateOffb, &seqState.DStream, dctx->OFTptr);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1089 ZSTD_initFseState(&seqState.stateML, &seqState.DStream, dctx->MLTptr);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1090
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1091 /* prepare in advance */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1092 for (seqNb=0; (BIT_reloadDStream(&seqState.DStream) <= BIT_DStream_completed) && (seqNb<seqAdvance); seqNb++) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1093 sequences[seqNb] = ZSTD_decodeSequenceLong(&seqState, isLongOffset);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1094 PREFETCH_L1(sequences[seqNb].match); PREFETCH_L1(sequences[seqNb].match + sequences[seqNb].matchLength - 1); /* note : it's safe to invoke PREFETCH() on any memory address, including invalid ones */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1095 }
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	1096 RETURN_ERROR_IF(seqNb<seqAdvance, corruption_detected);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1097
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1098 /* decode and decompress */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1099 for ( ; (BIT_reloadDStream(&(seqState.DStream)) <= BIT_DStream_completed) && (seqNb<nbSeq) ; seqNb++) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1100 seq_t const sequence = ZSTD_decodeSequenceLong(&seqState, isLongOffset);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1101 size_t const oneSeqSize = ZSTD_execSequenceLong(op, oend, sequences[(seqNb-ADVANCED_SEQS) & STORED_SEQS_MASK], &litPtr, litEnd, prefixStart, dictStart, dictEnd);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1102 if (ZSTD_isError(oneSeqSize)) return oneSeqSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1103 PREFETCH_L1(sequence.match); PREFETCH_L1(sequence.match + sequence.matchLength - 1); /* note : it's safe to invoke PREFETCH() on any memory address, including invalid ones */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1104 sequences[seqNb & STORED_SEQS_MASK] = sequence;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1105 op += oneSeqSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1106 }
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	1107 RETURN_ERROR_IF(seqNb<nbSeq, corruption_detected);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1108
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1109 /* finish queue */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1110 seqNb -= seqAdvance;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1111 for ( ; seqNb<nbSeq ; seqNb++) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1112 size_t const oneSeqSize = ZSTD_execSequenceLong(op, oend, sequences[seqNb&STORED_SEQS_MASK], &litPtr, litEnd, prefixStart, dictStart, dictEnd);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1113 if (ZSTD_isError(oneSeqSize)) return oneSeqSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1114 op += oneSeqSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1115 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1116
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1117 /* save reps for next block */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1118 { U32 i; for (i=0; i<ZSTD_REP_NUM; i++) dctx->entropy.rep[i] = (U32)(seqState.prevOffset[i]); }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1119 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1120
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1121 /* last literal segment */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1122 { size_t const lastLLSize = litEnd - litPtr;
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	1123 RETURN_ERROR_IF(lastLLSize > (size_t)(oend-op), dstSize_tooSmall);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1124 memcpy(op, litPtr, lastLLSize);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1125 op += lastLLSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1126 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1127
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1128 return op-ostart;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1129 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1130
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1131 static size_t
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1132 ZSTD_decompressSequencesLong_default(ZSTD_DCtx* dctx,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1133 void* dst, size_t maxDstSize,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1134 const void* seqStart, size_t seqSize, int nbSeq,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1135 const ZSTD_longOffset_e isLongOffset)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1136 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1137 return ZSTD_decompressSequencesLong_body(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1138 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1139 #endif /* ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1140
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1141
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1142
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1143 #if DYNAMIC_BMI2
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1144
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1145 #ifndef ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1146 static TARGET_ATTRIBUTE("bmi2") size_t
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	1147 DONT_VECTORIZE
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1148 ZSTD_decompressSequences_bmi2(ZSTD_DCtx* dctx,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1149 void* dst, size_t maxDstSize,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1150 const void* seqStart, size_t seqSize, int nbSeq,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1151 const ZSTD_longOffset_e isLongOffset)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1152 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1153 return ZSTD_decompressSequences_body(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1154 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1155 #endif /* ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1156
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1157 #ifndef ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1158 static TARGET_ATTRIBUTE("bmi2") size_t
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1159 ZSTD_decompressSequencesLong_bmi2(ZSTD_DCtx* dctx,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1160 void* dst, size_t maxDstSize,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1161 const void* seqStart, size_t seqSize, int nbSeq,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1162 const ZSTD_longOffset_e isLongOffset)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1163 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1164 return ZSTD_decompressSequencesLong_body(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1165 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1166 #endif /* ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1167
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1168 #endif /* DYNAMIC_BMI2 */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1169
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1170 typedef size_t (*ZSTD_decompressSequences_t)(
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1171 ZSTD_DCtx* dctx,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1172 void* dst, size_t maxDstSize,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1173 const void* seqStart, size_t seqSize, int nbSeq,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1174 const ZSTD_longOffset_e isLongOffset);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1175
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1176 #ifndef ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1177 static size_t
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1178 ZSTD_decompressSequences(ZSTD_DCtx* dctx, void* dst, size_t maxDstSize,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1179 const void* seqStart, size_t seqSize, int nbSeq,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1180 const ZSTD_longOffset_e isLongOffset)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1181 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1182 DEBUGLOG(5, "ZSTD_decompressSequences");
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1183 #if DYNAMIC_BMI2
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1184 if (dctx->bmi2) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1185 return ZSTD_decompressSequences_bmi2(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1186 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1187 #endif
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1188 return ZSTD_decompressSequences_default(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1189 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1190 #endif /* ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1191
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1192
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1193 #ifndef ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1194 /* ZSTD_decompressSequencesLong() :
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1195 * decompression function triggered when a minimum share of offsets is considered "long",
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1196 * aka out of cache.
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	1197 * note : "long" definition seems overloaded here, sometimes meaning "wider than bitstream register", and sometimes meaning "farther than memory cache distance".
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1198 * This function will try to mitigate main memory latency through the use of prefetching */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1199 static size_t
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1200 ZSTD_decompressSequencesLong(ZSTD_DCtx* dctx,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1201 void* dst, size_t maxDstSize,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1202 const void* seqStart, size_t seqSize, int nbSeq,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1203 const ZSTD_longOffset_e isLongOffset)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1204 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1205 DEBUGLOG(5, "ZSTD_decompressSequencesLong");
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1206 #if DYNAMIC_BMI2
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1207 if (dctx->bmi2) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1208 return ZSTD_decompressSequencesLong_bmi2(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1209 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1210 #endif
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1211 return ZSTD_decompressSequencesLong_default(dctx, dst, maxDstSize, seqStart, seqSize, nbSeq, isLongOffset);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1212 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1213 #endif /* ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1214
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1215
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1216
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1217 #if !defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT) && \
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1218 !defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1219 /* ZSTD_getLongOffsetsShare() :
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1220 * condition : offTable must be valid
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1221 * @return : "share" of long offsets (arbitrarily defined as > (1<<23))
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1222 * compared to maximum possible of (1<<OffFSELog) */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1223 static unsigned
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1224 ZSTD_getLongOffsetsShare(const ZSTD_seqSymbol* offTable)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1225 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1226 const void* ptr = offTable;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1227 U32 const tableLog = ((const ZSTD_seqSymbol_header*)ptr)[0].tableLog;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1228 const ZSTD_seqSymbol* table = offTable + 1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1229 U32 const max = 1 << tableLog;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1230 U32 u, total = 0;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1231 DEBUGLOG(5, "ZSTD_getLongOffsetsShare: (tableLog=%u)", tableLog);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1232
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1233 assert(max <= (1 << OffFSELog)); /* max not too large */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1234 for (u=0; u<max; u++) {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1235 if (table[u].nbAdditionalBits > 22) total += 1;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1236 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1237
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1238 assert(tableLog <= OffFSELog);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1239 total <<= (OffFSELog - tableLog); /* scale to OffFSELog */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1240
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1241 return total;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1242 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1243 #endif
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1244
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1245
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1246 size_t
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1247 ZSTD_decompressBlock_internal(ZSTD_DCtx* dctx,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1248 void* dst, size_t dstCapacity,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1249 const void* src, size_t srcSize, const int frame)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1250 { /* blockType == blockCompressed */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1251 const BYTE* ip = (const BYTE*)src;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1252 /* isLongOffset must be true if there are long offsets.
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1253 * Offsets are long if they are larger than 2^STREAM_ACCUMULATOR_MIN.
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1254 * We don't expect that to be the case in 64-bit mode.
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1255 * In block mode, window size is not known, so we have to be conservative.
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1256 * (note: but it could be evaluated from current-lowLimit)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1257 */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1258 ZSTD_longOffset_e const isLongOffset = (ZSTD_longOffset_e)(MEM_32bits() && (!frame \|\| (dctx->fParams.windowSize > (1ULL << STREAM_ACCUMULATOR_MIN))));
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1259 DEBUGLOG(5, "ZSTD_decompressBlock_internal (size : %u)", (U32)srcSize);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1260
42937 69de49c4e39c zstandard: vendor python-zstandard 0.12 Gregory Szorc <gregory.szorc@gmail.com> parents: 42070 diff changeset	1261 RETURN_ERROR_IF(srcSize >= ZSTD_BLOCKSIZE_MAX, srcSize_wrong);
42070 675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1262
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1263 /* Decode literals section */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1264 { size_t const litCSize = ZSTD_decodeLiteralsBlock(dctx, src, srcSize);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1265 DEBUGLOG(5, "ZSTD_decodeLiteralsBlock : %u", (U32)litCSize);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1266 if (ZSTD_isError(litCSize)) return litCSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1267 ip += litCSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1268 srcSize -= litCSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1269 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1270
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1271 /* Build Decoding Tables */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1272 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1273 /* These macros control at build-time which decompressor implementation
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1274 * we use. If neither is defined, we do some inspection and dispatch at
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1275 * runtime.
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1276 */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1277 #if !defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT) && \
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1278 !defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1279 int usePrefetchDecoder = dctx->ddictIsCold;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1280 #endif
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1281 int nbSeq;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1282 size_t const seqHSize = ZSTD_decodeSeqHeaders(dctx, &nbSeq, ip, srcSize);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1283 if (ZSTD_isError(seqHSize)) return seqHSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1284 ip += seqHSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1285 srcSize -= seqHSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1286
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1287 #if !defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT) && \
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1288 !defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1289 if ( !usePrefetchDecoder
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1290 && (!frame \|\| (dctx->fParams.windowSize > (1<<24)))
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1291 && (nbSeq>ADVANCED_SEQS) ) { /* could probably use a larger nbSeq limit */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1292 U32 const shareLongOffsets = ZSTD_getLongOffsetsShare(dctx->OFTptr);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1293 U32 const minShare = MEM_64bits() ? 7 : 20; /* heuristic values, correspond to 2.73% and 7.81% */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1294 usePrefetchDecoder = (shareLongOffsets >= minShare);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1295 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1296 #endif
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1297
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1298 dctx->ddictIsCold = 0;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1299
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1300 #if !defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT) && \
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1301 !defined(ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1302 if (usePrefetchDecoder)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1303 #endif
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1304 #ifndef ZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1305 return ZSTD_decompressSequencesLong(dctx, dst, dstCapacity, ip, srcSize, nbSeq, isLongOffset);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1306 #endif
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1307
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1308 #ifndef ZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1309 /* else */
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1310 return ZSTD_decompressSequences(dctx, dst, dstCapacity, ip, srcSize, nbSeq, isLongOffset);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1311 #endif
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1312 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1313 }
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1314
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1315
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1316 size_t ZSTD_decompressBlock(ZSTD_DCtx* dctx,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1317 void* dst, size_t dstCapacity,
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1318 const void* src, size_t srcSize)
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1319 {
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1320 size_t dSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1321 ZSTD_checkContinuity(dctx, dst);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1322 dSize = ZSTD_decompressBlock_internal(dctx, dst, dstCapacity, src, srcSize, /* frame */ 0);
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1323 dctx->previousDstEnd = (char*)dst + dSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1324 return dSize;
675775c33ab6 zstandard: vendor python-zstandard 0.11 Gregory Szorc <gregory.szorc@gmail.com> parents: diff changeset	1325 }

Mercurial > public > mercurial-scm > hg

annotate contrib/python-zstandard/zstd/decompress/zstd_decompress_block.c @ 42937:69de49c4e39c