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zstandard: vendor python-zstandard 0.9.0 This was just released. It features a number of goodies. More info at https://gregoryszorc.com/blog/2018/04/09/release-of-python-zstandard-0.9/. The clang-format ignore list was updated to reflect the new source of files. The project contains a vendored copy of zstandard 1.3.4. The old version was 1.1.3. One of the changes between those versions is that zstandard is now dual licensed BSD + GPLv2 and the patent rights grant has been removed. Good riddance. The API should be backwards compatible. So no changes in core should be needed. However, there were a number of changes in the library that we'll want to adapt to. Those will be addressed in subsequent commits. Differential Revision: https://phab.mercurial-scm.org/D3198
author Gregory Szorc <gregory.szorc@gmail.com>
date Mon, 09 Apr 2018 10:13:29 -0700
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children 73fef626dae3
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1 /*
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2 * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
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3 * All rights reserved.
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4 *
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5 * This source code is licensed under both the BSD-style license (found in the
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6 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
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7 * in the COPYING file in the root directory of this source tree).
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8 * You may select, at your option, one of the above-listed licenses.
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9 */
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10
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11 /* This header contains definitions
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12 * that shall **only** be used by modules within lib/compress.
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13 */
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14
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15 #ifndef ZSTD_COMPRESS_H
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16 #define ZSTD_COMPRESS_H
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17
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18 /*-*************************************
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19 * Dependencies
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20 ***************************************/
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21 #include "zstd_internal.h"
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22 #ifdef ZSTD_MULTITHREAD
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23 # include "zstdmt_compress.h"
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24 #endif
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25
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26 #if defined (__cplusplus)
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27 extern "C" {
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28 #endif
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29
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30 /*-*************************************
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31 * Constants
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32 ***************************************/
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33 #define kSearchStrength 8
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34 #define HASH_READ_SIZE 8
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35 #define ZSTD_DUBT_UNSORTED_MARK 1 /* For btlazy2 strategy, index 1 now means "unsorted".
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36 It could be confused for a real successor at index "1", if sorted as larger than its predecessor.
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37 It's not a big deal though : candidate will just be sorted again.
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38 Additionnally, candidate position 1 will be lost.
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39 But candidate 1 cannot hide a large tree of candidates, so it's a minimal loss.
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40 The benefit is that ZSTD_DUBT_UNSORTED_MARK cannot be misdhandled after table re-use with a different strategy */
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41
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42
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43 /*-*************************************
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44 * Context memory management
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45 ***************************************/
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46 typedef enum { ZSTDcs_created=0, ZSTDcs_init, ZSTDcs_ongoing, ZSTDcs_ending } ZSTD_compressionStage_e;
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47 typedef enum { zcss_init=0, zcss_load, zcss_flush } ZSTD_cStreamStage;
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48
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49 typedef struct ZSTD_prefixDict_s {
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50 const void* dict;
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51 size_t dictSize;
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52 ZSTD_dictContentType_e dictContentType;
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53 } ZSTD_prefixDict;
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54
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55 typedef struct {
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56 U32 hufCTable[HUF_CTABLE_SIZE_U32(255)];
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57 FSE_CTable offcodeCTable[FSE_CTABLE_SIZE_U32(OffFSELog, MaxOff)];
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58 FSE_CTable matchlengthCTable[FSE_CTABLE_SIZE_U32(MLFSELog, MaxML)];
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59 FSE_CTable litlengthCTable[FSE_CTABLE_SIZE_U32(LLFSELog, MaxLL)];
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60 HUF_repeat hufCTable_repeatMode;
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61 FSE_repeat offcode_repeatMode;
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62 FSE_repeat matchlength_repeatMode;
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63 FSE_repeat litlength_repeatMode;
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64 } ZSTD_entropyCTables_t;
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65
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66 typedef struct {
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67 U32 off;
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68 U32 len;
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69 } ZSTD_match_t;
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70
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71 typedef struct {
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72 int price;
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73 U32 off;
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74 U32 mlen;
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75 U32 litlen;
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76 U32 rep[ZSTD_REP_NUM];
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77 } ZSTD_optimal_t;
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78
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79 typedef struct {
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80 /* All tables are allocated inside cctx->workspace by ZSTD_resetCCtx_internal() */
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81 U32* litFreq; /* table of literals statistics, of size 256 */
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82 U32* litLengthFreq; /* table of litLength statistics, of size (MaxLL+1) */
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83 U32* matchLengthFreq; /* table of matchLength statistics, of size (MaxML+1) */
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84 U32* offCodeFreq; /* table of offCode statistics, of size (MaxOff+1) */
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85 ZSTD_match_t* matchTable; /* list of found matches, of size ZSTD_OPT_NUM+1 */
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86 ZSTD_optimal_t* priceTable; /* All positions tracked by optimal parser, of size ZSTD_OPT_NUM+1 */
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87
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88 U32 litSum; /* nb of literals */
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89 U32 litLengthSum; /* nb of litLength codes */
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90 U32 matchLengthSum; /* nb of matchLength codes */
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91 U32 offCodeSum; /* nb of offset codes */
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92 /* begin updated by ZSTD_setLog2Prices */
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93 U32 log2litSum; /* pow2 to compare log2(litfreq) to */
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94 U32 log2litLengthSum; /* pow2 to compare log2(llfreq) to */
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95 U32 log2matchLengthSum; /* pow2 to compare log2(mlfreq) to */
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96 U32 log2offCodeSum; /* pow2 to compare log2(offreq) to */
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97 /* end : updated by ZSTD_setLog2Prices */
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98 U32 staticPrices; /* prices follow a pre-defined cost structure, statistics are irrelevant */
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99 } optState_t;
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100
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101 typedef struct {
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102 ZSTD_entropyCTables_t entropy;
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103 U32 rep[ZSTD_REP_NUM];
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104 } ZSTD_compressedBlockState_t;
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105
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106 typedef struct {
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107 BYTE const* nextSrc; /* next block here to continue on current prefix */
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108 BYTE const* base; /* All regular indexes relative to this position */
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109 BYTE const* dictBase; /* extDict indexes relative to this position */
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110 U32 dictLimit; /* below that point, need extDict */
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111 U32 lowLimit; /* below that point, no more data */
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112 } ZSTD_window_t;
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113
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114 typedef struct {
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115 ZSTD_window_t window; /* State for window round buffer management */
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116 U32 loadedDictEnd; /* index of end of dictionary */
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117 U32 nextToUpdate; /* index from which to continue table update */
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118 U32 nextToUpdate3; /* index from which to continue table update */
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119 U32 hashLog3; /* dispatch table : larger == faster, more memory */
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120 U32* hashTable;
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121 U32* hashTable3;
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122 U32* chainTable;
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123 optState_t opt; /* optimal parser state */
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124 } ZSTD_matchState_t;
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125
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diff changeset
126 typedef struct {
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parents:
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127 ZSTD_compressedBlockState_t* prevCBlock;
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parents:
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128 ZSTD_compressedBlockState_t* nextCBlock;
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parents:
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129 ZSTD_matchState_t matchState;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
130 } ZSTD_blockState_t;
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parents:
diff changeset
131
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diff changeset
132 typedef struct {
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133 U32 offset;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
134 U32 checksum;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
135 } ldmEntry_t;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
136
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
137 typedef struct {
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parents:
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138 ZSTD_window_t window; /* State for the window round buffer management */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
139 ldmEntry_t* hashTable;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
140 BYTE* bucketOffsets; /* Next position in bucket to insert entry */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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141 U64 hashPower; /* Used to compute the rolling hash.
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
142 * Depends on ldmParams.minMatchLength */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
143 } ldmState_t;
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Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
144
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
145 typedef struct {
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diff changeset
146 U32 enableLdm; /* 1 if enable long distance matching */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
147 U32 hashLog; /* Log size of hashTable */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
148 U32 bucketSizeLog; /* Log bucket size for collision resolution, at most 8 */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
149 U32 minMatchLength; /* Minimum match length */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
150 U32 hashEveryLog; /* Log number of entries to skip */
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parents:
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151 U32 windowLog; /* Window log for the LDM */
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parents:
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152 } ldmParams_t;
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153
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Gregory Szorc <gregory.szorc@gmail.com>
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154 typedef struct {
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155 U32 offset;
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Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
156 U32 litLength;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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157 U32 matchLength;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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158 } rawSeq;
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159
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160 typedef struct {
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161 rawSeq* seq; /* The start of the sequences */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
162 size_t pos; /* The position where reading stopped. <= size. */
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163 size_t size; /* The number of sequences. <= capacity. */
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parents:
diff changeset
164 size_t capacity; /* The capacity of the `seq` pointer */
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165 } rawSeqStore_t;
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parents:
diff changeset
166
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
167 struct ZSTD_CCtx_params_s {
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parents:
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168 ZSTD_format_e format;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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169 ZSTD_compressionParameters cParams;
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Gregory Szorc <gregory.szorc@gmail.com>
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170 ZSTD_frameParameters fParams;
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Gregory Szorc <gregory.szorc@gmail.com>
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171
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Gregory Szorc <gregory.szorc@gmail.com>
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172 int compressionLevel;
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Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
173 int disableLiteralCompression;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
174 int forceWindow; /* force back-references to respect limit of
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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175 * 1<<wLog, even for dictionary */
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Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
176
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Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
177 /* Multithreading: used to pass parameters to mtctx */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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178 unsigned nbWorkers;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
179 unsigned jobSize;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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180 unsigned overlapSizeLog;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
181
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
182 /* Long distance matching parameters */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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183 ldmParams_t ldmParams;
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Gregory Szorc <gregory.szorc@gmail.com>
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184
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
185 /* Internal use, for createCCtxParams() and freeCCtxParams() only */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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186 ZSTD_customMem customMem;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
187 }; /* typedef'd to ZSTD_CCtx_params within "zstd.h" */
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188
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Gregory Szorc <gregory.szorc@gmail.com>
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189 struct ZSTD_CCtx_s {
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Gregory Szorc <gregory.szorc@gmail.com>
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190 ZSTD_compressionStage_e stage;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
191 int cParamsChanged; /* == 1 if cParams(except wlog) or compression level are changed in requestedParams. Triggers transmission of new params to ZSTDMT (if available) then reset to 0. */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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192 int bmi2; /* == 1 if the CPU supports BMI2 and 0 otherwise. CPU support is determined dynamically once per context lifetime. */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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193 ZSTD_CCtx_params requestedParams;
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Gregory Szorc <gregory.szorc@gmail.com>
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194 ZSTD_CCtx_params appliedParams;
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Gregory Szorc <gregory.szorc@gmail.com>
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195 U32 dictID;
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Gregory Szorc <gregory.szorc@gmail.com>
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196 void* workSpace;
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Gregory Szorc <gregory.szorc@gmail.com>
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197 size_t workSpaceSize;
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Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
198 size_t blockSize;
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Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
199 unsigned long long pledgedSrcSizePlusOne; /* this way, 0 (default) == unknown */
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Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
200 unsigned long long consumedSrcSize;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
201 unsigned long long producedCSize;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
202 XXH64_state_t xxhState;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
203 ZSTD_customMem customMem;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
204 size_t staticSize;
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Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
205
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Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
206 seqStore_t seqStore; /* sequences storage ptrs */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
207 ldmState_t ldmState; /* long distance matching state */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
208 rawSeq* ldmSequences; /* Storage for the ldm output sequences */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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209 size_t maxNbLdmSequences;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
210 rawSeqStore_t externSeqStore; /* Mutable reference to external sequences */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
211 ZSTD_blockState_t blockState;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
212 U32* entropyWorkspace; /* entropy workspace of HUF_WORKSPACE_SIZE bytes */
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Gregory Szorc <gregory.szorc@gmail.com>
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213
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Gregory Szorc <gregory.szorc@gmail.com>
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214 /* streaming */
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Gregory Szorc <gregory.szorc@gmail.com>
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215 char* inBuff;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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216 size_t inBuffSize;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
217 size_t inToCompress;
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Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
218 size_t inBuffPos;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
219 size_t inBuffTarget;
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Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
220 char* outBuff;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
221 size_t outBuffSize;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
222 size_t outBuffContentSize;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
223 size_t outBuffFlushedSize;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
224 ZSTD_cStreamStage streamStage;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
225 U32 frameEnded;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
226
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
227 /* Dictionary */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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228 ZSTD_CDict* cdictLocal;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
229 const ZSTD_CDict* cdict;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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230 ZSTD_prefixDict prefixDict; /* single-usage dictionary */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
231
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
232 /* Multi-threading */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
233 #ifdef ZSTD_MULTITHREAD
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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234 ZSTDMT_CCtx* mtctx;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
235 #endif
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
236 };
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
237
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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238
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
239 typedef size_t (*ZSTD_blockCompressor) (
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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240 ZSTD_matchState_t* bs, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
241 ZSTD_compressionParameters const* cParams, void const* src, size_t srcSize);
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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242 ZSTD_blockCompressor ZSTD_selectBlockCompressor(ZSTD_strategy strat, int extDict);
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parents:
diff changeset
243
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
244
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
245 MEM_STATIC U32 ZSTD_LLcode(U32 litLength)
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
246 {
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
247 static const BYTE LL_Code[64] = { 0, 1, 2, 3, 4, 5, 6, 7,
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parents:
diff changeset
248 8, 9, 10, 11, 12, 13, 14, 15,
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parents:
diff changeset
249 16, 16, 17, 17, 18, 18, 19, 19,
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
250 20, 20, 20, 20, 21, 21, 21, 21,
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parents:
diff changeset
251 22, 22, 22, 22, 22, 22, 22, 22,
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parents:
diff changeset
252 23, 23, 23, 23, 23, 23, 23, 23,
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parents:
diff changeset
253 24, 24, 24, 24, 24, 24, 24, 24,
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parents:
diff changeset
254 24, 24, 24, 24, 24, 24, 24, 24 };
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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255 static const U32 LL_deltaCode = 19;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
256 return (litLength > 63) ? ZSTD_highbit32(litLength) + LL_deltaCode : LL_Code[litLength];
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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257 }
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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258
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Gregory Szorc <gregory.szorc@gmail.com>
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diff changeset
259 /* ZSTD_MLcode() :
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
260 * note : mlBase = matchLength - MINMATCH;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
261 * because it's the format it's stored in seqStore->sequences */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
262 MEM_STATIC U32 ZSTD_MLcode(U32 mlBase)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
263 {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
264 static const BYTE ML_Code[128] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
265 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
266 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 36, 36, 37, 37, 37, 37,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
267 38, 38, 38, 38, 38, 38, 38, 38, 39, 39, 39, 39, 39, 39, 39, 39,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
268 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
269 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
270 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
271 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42, 42 };
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
272 static const U32 ML_deltaCode = 36;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
273 return (mlBase > 127) ? ZSTD_highbit32(mlBase) + ML_deltaCode : ML_Code[mlBase];
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
274 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
275
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
276 /*! ZSTD_storeSeq() :
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
277 * Store a sequence (literal length, literals, offset code and match length code) into seqStore_t.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
278 * `offsetCode` : distance to match + 3 (values 1-3 are repCodes).
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
279 * `mlBase` : matchLength - MINMATCH
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
280 */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
281 MEM_STATIC void ZSTD_storeSeq(seqStore_t* seqStorePtr, size_t litLength, const void* literals, U32 offsetCode, size_t mlBase)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
282 {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
283 #if defined(ZSTD_DEBUG) && (ZSTD_DEBUG >= 6)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
284 static const BYTE* g_start = NULL;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
285 if (g_start==NULL) g_start = (const BYTE*)literals; /* note : index only works for compression within a single segment */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
286 { U32 const pos = (U32)((const BYTE*)literals - g_start);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
287 DEBUGLOG(6, "Cpos%7u :%3u literals, match%3u bytes at dist.code%7u",
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
288 pos, (U32)litLength, (U32)mlBase+MINMATCH, (U32)offsetCode);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
289 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
290 #endif
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
291 /* copy Literals */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
292 assert(seqStorePtr->lit + litLength <= seqStorePtr->litStart + 128 KB);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
293 ZSTD_wildcopy(seqStorePtr->lit, literals, litLength);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
294 seqStorePtr->lit += litLength;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
295
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
296 /* literal Length */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
297 if (litLength>0xFFFF) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
298 assert(seqStorePtr->longLengthID == 0); /* there can only be a single long length */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
299 seqStorePtr->longLengthID = 1;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
300 seqStorePtr->longLengthPos = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
301 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
302 seqStorePtr->sequences[0].litLength = (U16)litLength;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
303
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
304 /* match offset */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
305 seqStorePtr->sequences[0].offset = offsetCode + 1;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
306
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
307 /* match Length */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
308 if (mlBase>0xFFFF) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
309 assert(seqStorePtr->longLengthID == 0); /* there can only be a single long length */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
310 seqStorePtr->longLengthID = 2;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
311 seqStorePtr->longLengthPos = (U32)(seqStorePtr->sequences - seqStorePtr->sequencesStart);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
312 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
313 seqStorePtr->sequences[0].matchLength = (U16)mlBase;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
314
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
315 seqStorePtr->sequences++;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
316 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
317
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
318
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
319 /*-*************************************
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
320 * Match length counter
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
321 ***************************************/
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
322 static unsigned ZSTD_NbCommonBytes (size_t val)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
323 {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
324 if (MEM_isLittleEndian()) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
325 if (MEM_64bits()) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
326 # if defined(_MSC_VER) && defined(_WIN64)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
327 unsigned long r = 0;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
328 _BitScanForward64( &r, (U64)val );
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
329 return (unsigned)(r>>3);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
330 # elif defined(__GNUC__) && (__GNUC__ >= 4)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
331 return (__builtin_ctzll((U64)val) >> 3);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
332 # else
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
333 static const int DeBruijnBytePos[64] = { 0, 0, 0, 0, 0, 1, 1, 2,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
334 0, 3, 1, 3, 1, 4, 2, 7,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
335 0, 2, 3, 6, 1, 5, 3, 5,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
336 1, 3, 4, 4, 2, 5, 6, 7,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
337 7, 0, 1, 2, 3, 3, 4, 6,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
338 2, 6, 5, 5, 3, 4, 5, 6,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
339 7, 1, 2, 4, 6, 4, 4, 5,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
340 7, 2, 6, 5, 7, 6, 7, 7 };
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
341 return DeBruijnBytePos[((U64)((val & -(long long)val) * 0x0218A392CDABBD3FULL)) >> 58];
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
342 # endif
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
343 } else { /* 32 bits */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
344 # if defined(_MSC_VER)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
345 unsigned long r=0;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
346 _BitScanForward( &r, (U32)val );
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
347 return (unsigned)(r>>3);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
348 # elif defined(__GNUC__) && (__GNUC__ >= 3)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
349 return (__builtin_ctz((U32)val) >> 3);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
350 # else
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
351 static const int DeBruijnBytePos[32] = { 0, 0, 3, 0, 3, 1, 3, 0,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
352 3, 2, 2, 1, 3, 2, 0, 1,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
353 3, 3, 1, 2, 2, 2, 2, 0,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
354 3, 1, 2, 0, 1, 0, 1, 1 };
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
355 return DeBruijnBytePos[((U32)((val & -(S32)val) * 0x077CB531U)) >> 27];
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
356 # endif
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
357 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
358 } else { /* Big Endian CPU */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
359 if (MEM_64bits()) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
360 # if defined(_MSC_VER) && defined(_WIN64)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
361 unsigned long r = 0;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
362 _BitScanReverse64( &r, val );
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
363 return (unsigned)(r>>3);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
364 # elif defined(__GNUC__) && (__GNUC__ >= 4)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
365 return (__builtin_clzll(val) >> 3);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
366 # else
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
367 unsigned r;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
368 const unsigned n32 = sizeof(size_t)*4; /* calculate this way due to compiler complaining in 32-bits mode */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
369 if (!(val>>n32)) { r=4; } else { r=0; val>>=n32; }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
370 if (!(val>>16)) { r+=2; val>>=8; } else { val>>=24; }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
371 r += (!val);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
372 return r;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
373 # endif
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
374 } else { /* 32 bits */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
375 # if defined(_MSC_VER)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
376 unsigned long r = 0;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
377 _BitScanReverse( &r, (unsigned long)val );
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
378 return (unsigned)(r>>3);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
379 # elif defined(__GNUC__) && (__GNUC__ >= 3)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
380 return (__builtin_clz((U32)val) >> 3);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
381 # else
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
382 unsigned r;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
383 if (!(val>>16)) { r=2; val>>=8; } else { r=0; val>>=24; }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
384 r += (!val);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
385 return r;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
386 # endif
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
387 } }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
388 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
389
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
390
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
391 MEM_STATIC size_t ZSTD_count(const BYTE* pIn, const BYTE* pMatch, const BYTE* const pInLimit)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
392 {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
393 const BYTE* const pStart = pIn;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
394 const BYTE* const pInLoopLimit = pInLimit - (sizeof(size_t)-1);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
395
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
396 if (pIn < pInLoopLimit) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
397 { size_t const diff = MEM_readST(pMatch) ^ MEM_readST(pIn);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
398 if (diff) return ZSTD_NbCommonBytes(diff); }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
399 pIn+=sizeof(size_t); pMatch+=sizeof(size_t);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
400 while (pIn < pInLoopLimit) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
401 size_t const diff = MEM_readST(pMatch) ^ MEM_readST(pIn);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
402 if (!diff) { pIn+=sizeof(size_t); pMatch+=sizeof(size_t); continue; }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
403 pIn += ZSTD_NbCommonBytes(diff);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
404 return (size_t)(pIn - pStart);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
405 } }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
406 if (MEM_64bits() && (pIn<(pInLimit-3)) && (MEM_read32(pMatch) == MEM_read32(pIn))) { pIn+=4; pMatch+=4; }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
407 if ((pIn<(pInLimit-1)) && (MEM_read16(pMatch) == MEM_read16(pIn))) { pIn+=2; pMatch+=2; }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
408 if ((pIn<pInLimit) && (*pMatch == *pIn)) pIn++;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
409 return (size_t)(pIn - pStart);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
410 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
411
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
412 /** ZSTD_count_2segments() :
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
413 * can count match length with `ip` & `match` in 2 different segments.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
414 * convention : on reaching mEnd, match count continue starting from iStart
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
415 */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
416 MEM_STATIC size_t
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
417 ZSTD_count_2segments(const BYTE* ip, const BYTE* match,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
418 const BYTE* iEnd, const BYTE* mEnd, const BYTE* iStart)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
419 {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
420 const BYTE* const vEnd = MIN( ip + (mEnd - match), iEnd);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
421 size_t const matchLength = ZSTD_count(ip, match, vEnd);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
422 if (match + matchLength != mEnd) return matchLength;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
423 return matchLength + ZSTD_count(ip+matchLength, iStart, iEnd);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
424 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
425
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
426
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
427 /*-*************************************
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
428 * Hashes
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
429 ***************************************/
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
430 static const U32 prime3bytes = 506832829U;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
431 static U32 ZSTD_hash3(U32 u, U32 h) { return ((u << (32-24)) * prime3bytes) >> (32-h) ; }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
432 MEM_STATIC size_t ZSTD_hash3Ptr(const void* ptr, U32 h) { return ZSTD_hash3(MEM_readLE32(ptr), h); } /* only in zstd_opt.h */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
433
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
434 static const U32 prime4bytes = 2654435761U;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
435 static U32 ZSTD_hash4(U32 u, U32 h) { return (u * prime4bytes) >> (32-h) ; }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
436 static size_t ZSTD_hash4Ptr(const void* ptr, U32 h) { return ZSTD_hash4(MEM_read32(ptr), h); }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
437
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
438 static const U64 prime5bytes = 889523592379ULL;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
439 static size_t ZSTD_hash5(U64 u, U32 h) { return (size_t)(((u << (64-40)) * prime5bytes) >> (64-h)) ; }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
440 static size_t ZSTD_hash5Ptr(const void* p, U32 h) { return ZSTD_hash5(MEM_readLE64(p), h); }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
441
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
442 static const U64 prime6bytes = 227718039650203ULL;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
443 static size_t ZSTD_hash6(U64 u, U32 h) { return (size_t)(((u << (64-48)) * prime6bytes) >> (64-h)) ; }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
444 static size_t ZSTD_hash6Ptr(const void* p, U32 h) { return ZSTD_hash6(MEM_readLE64(p), h); }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
445
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
446 static const U64 prime7bytes = 58295818150454627ULL;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
447 static size_t ZSTD_hash7(U64 u, U32 h) { return (size_t)(((u << (64-56)) * prime7bytes) >> (64-h)) ; }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
448 static size_t ZSTD_hash7Ptr(const void* p, U32 h) { return ZSTD_hash7(MEM_readLE64(p), h); }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
449
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
450 static const U64 prime8bytes = 0xCF1BBCDCB7A56463ULL;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
451 static size_t ZSTD_hash8(U64 u, U32 h) { return (size_t)(((u) * prime8bytes) >> (64-h)) ; }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
452 static size_t ZSTD_hash8Ptr(const void* p, U32 h) { return ZSTD_hash8(MEM_readLE64(p), h); }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
453
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
454 MEM_STATIC size_t ZSTD_hashPtr(const void* p, U32 hBits, U32 mls)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
455 {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
456 switch(mls)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
457 {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
458 default:
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
459 case 4: return ZSTD_hash4Ptr(p, hBits);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
460 case 5: return ZSTD_hash5Ptr(p, hBits);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
461 case 6: return ZSTD_hash6Ptr(p, hBits);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
462 case 7: return ZSTD_hash7Ptr(p, hBits);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
463 case 8: return ZSTD_hash8Ptr(p, hBits);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
464 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
465 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
466
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
467 /*-*************************************
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
468 * Round buffer management
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
469 ***************************************/
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
470 /* Max current allowed */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
471 #define ZSTD_CURRENT_MAX ((3U << 29) + (1U << ZSTD_WINDOWLOG_MAX))
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
472 /* Maximum chunk size before overflow correction needs to be called again */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
473 #define ZSTD_CHUNKSIZE_MAX \
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
474 ( ((U32)-1) /* Maximum ending current index */ \
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
475 - ZSTD_CURRENT_MAX) /* Maximum beginning lowLimit */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
476
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
477 /**
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
478 * ZSTD_window_clear():
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
479 * Clears the window containing the history by simply setting it to empty.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
480 */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
481 MEM_STATIC void ZSTD_window_clear(ZSTD_window_t* window)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
482 {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
483 size_t const endT = (size_t)(window->nextSrc - window->base);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
484 U32 const end = (U32)endT;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
485
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
486 window->lowLimit = end;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
487 window->dictLimit = end;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
488 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
489
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
490 /**
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
491 * ZSTD_window_hasExtDict():
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
492 * Returns non-zero if the window has a non-empty extDict.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
493 */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
494 MEM_STATIC U32 ZSTD_window_hasExtDict(ZSTD_window_t const window)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
495 {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
496 return window.lowLimit < window.dictLimit;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
497 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
498
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
499 /**
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
500 * ZSTD_window_needOverflowCorrection():
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
501 * Returns non-zero if the indices are getting too large and need overflow
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
502 * protection.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
503 */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
504 MEM_STATIC U32 ZSTD_window_needOverflowCorrection(ZSTD_window_t const window,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
505 void const* srcEnd)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
506 {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
507 U32 const current = (U32)((BYTE const*)srcEnd - window.base);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
508 return current > ZSTD_CURRENT_MAX;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
509 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
510
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
511 /**
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
512 * ZSTD_window_correctOverflow():
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
513 * Reduces the indices to protect from index overflow.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
514 * Returns the correction made to the indices, which must be applied to every
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
515 * stored index.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
516 *
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
517 * The least significant cycleLog bits of the indices must remain the same,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
518 * which may be 0. Every index up to maxDist in the past must be valid.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
519 * NOTE: (maxDist & cycleMask) must be zero.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
520 */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
521 MEM_STATIC U32 ZSTD_window_correctOverflow(ZSTD_window_t* window, U32 cycleLog,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
522 U32 maxDist, void const* src)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
523 {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
524 /* preemptive overflow correction:
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
525 * 1. correction is large enough:
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
526 * lowLimit > (3<<29) ==> current > 3<<29 + 1<<windowLog
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
527 * 1<<windowLog <= newCurrent < 1<<chainLog + 1<<windowLog
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
528 *
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
529 * current - newCurrent
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
530 * > (3<<29 + 1<<windowLog) - (1<<windowLog + 1<<chainLog)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
531 * > (3<<29) - (1<<chainLog)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
532 * > (3<<29) - (1<<30) (NOTE: chainLog <= 30)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
533 * > 1<<29
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
534 *
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
535 * 2. (ip+ZSTD_CHUNKSIZE_MAX - cctx->base) doesn't overflow:
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
536 * After correction, current is less than (1<<chainLog + 1<<windowLog).
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
537 * In 64-bit mode we are safe, because we have 64-bit ptrdiff_t.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
538 * In 32-bit mode we are safe, because (chainLog <= 29), so
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
539 * ip+ZSTD_CHUNKSIZE_MAX - cctx->base < 1<<32.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
540 * 3. (cctx->lowLimit + 1<<windowLog) < 1<<32:
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
541 * windowLog <= 31 ==> 3<<29 + 1<<windowLog < 7<<29 < 1<<32.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
542 */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
543 U32 const cycleMask = (1U << cycleLog) - 1;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
544 U32 const current = (U32)((BYTE const*)src - window->base);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
545 U32 const newCurrent = (current & cycleMask) + maxDist;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
546 U32 const correction = current - newCurrent;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
547 assert((maxDist & cycleMask) == 0);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
548 assert(current > newCurrent);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
549 /* Loose bound, should be around 1<<29 (see above) */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
550 assert(correction > 1<<28);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
551
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
552 window->base += correction;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
553 window->dictBase += correction;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
554 window->lowLimit -= correction;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
555 window->dictLimit -= correction;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
556
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
557 DEBUGLOG(4, "Correction of 0x%x bytes to lowLimit=0x%x", correction,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
558 window->lowLimit);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
559 return correction;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
560 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
561
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
562 /**
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
563 * ZSTD_window_enforceMaxDist():
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
564 * Updates lowLimit so that:
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
565 * (srcEnd - base) - lowLimit == maxDist + loadedDictEnd
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
566 * This allows a simple check that index >= lowLimit to see if index is valid.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
567 * This must be called before a block compression call, with srcEnd as the block
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
568 * source end.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
569 * If loadedDictEndPtr is not NULL, we set it to zero once we update lowLimit.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
570 * This is because dictionaries are allowed to be referenced as long as the last
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
571 * byte of the dictionary is in the window, but once they are out of range,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
572 * they cannot be referenced. If loadedDictEndPtr is NULL, we use
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
573 * loadedDictEnd == 0.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
574 */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
575 MEM_STATIC void ZSTD_window_enforceMaxDist(ZSTD_window_t* window,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
576 void const* srcEnd, U32 maxDist,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
577 U32* loadedDictEndPtr)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
578 {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
579 U32 const current = (U32)((BYTE const*)srcEnd - window->base);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
580 U32 loadedDictEnd = loadedDictEndPtr != NULL ? *loadedDictEndPtr : 0;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
581 if (current > maxDist + loadedDictEnd) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
582 U32 const newLowLimit = current - maxDist;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
583 if (window->lowLimit < newLowLimit) window->lowLimit = newLowLimit;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
584 if (window->dictLimit < window->lowLimit) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
585 DEBUGLOG(5, "Update dictLimit from %u to %u", window->dictLimit,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
586 window->lowLimit);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
587 window->dictLimit = window->lowLimit;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
588 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
589 if (loadedDictEndPtr)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
590 *loadedDictEndPtr = 0;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
591 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
592 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
593
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
594 /**
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
595 * ZSTD_window_update():
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
596 * Updates the window by appending [src, src + srcSize) to the window.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
597 * If it is not contiguous, the current prefix becomes the extDict, and we
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
598 * forget about the extDict. Handles overlap of the prefix and extDict.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
599 * Returns non-zero if the segment is contiguous.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
600 */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
601 MEM_STATIC U32 ZSTD_window_update(ZSTD_window_t* window,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
602 void const* src, size_t srcSize)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
603 {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
604 BYTE const* const ip = (BYTE const*)src;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
605 U32 contiguous = 1;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
606 /* Check if blocks follow each other */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
607 if (src != window->nextSrc) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
608 /* not contiguous */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
609 size_t const distanceFromBase = (size_t)(window->nextSrc - window->base);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
610 DEBUGLOG(5, "Non contiguous blocks, new segment starts at %u",
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
611 window->dictLimit);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
612 window->lowLimit = window->dictLimit;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
613 assert(distanceFromBase == (size_t)(U32)distanceFromBase); /* should never overflow */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
614 window->dictLimit = (U32)distanceFromBase;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
615 window->dictBase = window->base;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
616 window->base = ip - distanceFromBase;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
617 // ms->nextToUpdate = window->dictLimit;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
618 if (window->dictLimit - window->lowLimit < HASH_READ_SIZE) window->lowLimit = window->dictLimit; /* too small extDict */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
619 contiguous = 0;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
620 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
621 window->nextSrc = ip + srcSize;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
622 /* if input and dictionary overlap : reduce dictionary (area presumed modified by input) */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
623 if ( (ip+srcSize > window->dictBase + window->lowLimit)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
624 & (ip < window->dictBase + window->dictLimit)) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
625 ptrdiff_t const highInputIdx = (ip + srcSize) - window->dictBase;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
626 U32 const lowLimitMax = (highInputIdx > (ptrdiff_t)window->dictLimit) ? window->dictLimit : (U32)highInputIdx;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
627 window->lowLimit = lowLimitMax;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
628 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
629 return contiguous;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
630 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
631
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
632 #if defined (__cplusplus)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
633 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
634 #endif
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
635
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
636
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
637 /* ==============================================================
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
638 * Private declarations
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
639 * These prototypes shall only be called from within lib/compress
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
640 * ============================================================== */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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641
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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642 /* ZSTD_getCParamsFromCCtxParams() :
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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643 * cParams are built depending on compressionLevel, src size hints,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
644 * LDM and manually set compression parameters.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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645 */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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646 ZSTD_compressionParameters ZSTD_getCParamsFromCCtxParams(
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
647 const ZSTD_CCtx_params* CCtxParams, U64 srcSizeHint, size_t dictSize);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
648
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
649 /*! ZSTD_initCStream_internal() :
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
650 * Private use only. Init streaming operation.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
651 * expects params to be valid.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
652 * must receive dict, or cdict, or none, but not both.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
653 * @return : 0, or an error code */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
654 size_t ZSTD_initCStream_internal(ZSTD_CStream* zcs,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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655 const void* dict, size_t dictSize,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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656 const ZSTD_CDict* cdict,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
657 ZSTD_CCtx_params params, unsigned long long pledgedSrcSize);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
658
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
659 /*! ZSTD_compressStream_generic() :
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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660 * Private use only. To be called from zstdmt_compress.c in single-thread mode. */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
661 size_t ZSTD_compressStream_generic(ZSTD_CStream* zcs,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
662 ZSTD_outBuffer* output,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
663 ZSTD_inBuffer* input,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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664 ZSTD_EndDirective const flushMode);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
665
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
666 /*! ZSTD_getCParamsFromCDict() :
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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667 * as the name implies */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
668 ZSTD_compressionParameters ZSTD_getCParamsFromCDict(const ZSTD_CDict* cdict);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
669
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
670 /* ZSTD_compressBegin_advanced_internal() :
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
671 * Private use only. To be called from zstdmt_compress.c. */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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672 size_t ZSTD_compressBegin_advanced_internal(ZSTD_CCtx* cctx,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
673 const void* dict, size_t dictSize,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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674 ZSTD_dictContentType_e dictContentType,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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675 const ZSTD_CDict* cdict,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
676 ZSTD_CCtx_params params,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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677 unsigned long long pledgedSrcSize);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
678
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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679 /* ZSTD_compress_advanced_internal() :
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
680 * Private use only. To be called from zstdmt_compress.c. */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
681 size_t ZSTD_compress_advanced_internal(ZSTD_CCtx* cctx,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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682 void* dst, size_t dstCapacity,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
683 const void* src, size_t srcSize,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
684 const void* dict,size_t dictSize,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
685 ZSTD_CCtx_params params);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
686
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
687
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
688 /* ZSTD_writeLastEmptyBlock() :
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
689 * output an empty Block with end-of-frame mark to complete a frame
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
690 * @return : size of data written into `dst` (== ZSTD_blockHeaderSize (defined in zstd_internal.h))
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
691 * or an error code if `dstCapcity` is too small (<ZSTD_blockHeaderSize)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
692 */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
693 size_t ZSTD_writeLastEmptyBlock(void* dst, size_t dstCapacity);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
694
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
695
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
696 /* ZSTD_referenceExternalSequences() :
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
697 * Must be called before starting a compression operation.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
698 * seqs must parse a prefix of the source.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
699 * This cannot be used when long range matching is enabled.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
700 * Zstd will use these sequences, and pass the literals to a secondary block
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
701 * compressor.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
702 * @return : An error code on failure.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
703 * NOTE: seqs are not verified! Invalid sequences can cause out-of-bounds memory
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
704 * access and data corruption.
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
705 */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
706 size_t ZSTD_referenceExternalSequences(ZSTD_CCtx* cctx, rawSeq* seq, size_t nbSeq);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
707
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
708
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
709 #endif /* ZSTD_COMPRESS_H */