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annotate contrib/python-zstandard/zstd/compress/zstd_fast.c @ 40121:73fef626dae3

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zstandard: vendor python-zstandard 0.10.1 This was just released. The upstream source distribution from PyPI was extracted. Unwanted files were removed. The clang-format ignore list was updated to reflect the new source of files. setup.py was updated to pass a new argument to python-zstandard's function for returning an Extension instance. Upstream had to change to use relative paths because Python 3.7's packaging doesn't seem to like absolute paths when defining sources, includes, etc. The default relative path calculation is relative to setup_zstd.py which is different from the directory of Mercurial's setup.py. The project contains a vendored copy of zstandard 1.3.6. The old version was 1.3.4. The API should be backwards compatible and nothing in core should need adjusted. However, there is a new "chunker" API that we may find useful in places where we want to emit compressed chunks of a fixed size. There are a pair of bug fixes in 0.10.0 with regards to compressobj() and decompressobj() when block flushing is used. I actually found these bugs when introducing these APIs in Mercurial! But existing Mercurial code is not affected because we don't perform block flushing. # no-check-commit because 3rd party code has different style guidelines Differential Revision: https://phab.mercurial-scm.org/D4911
author Gregory Szorc <gregory.szorc@gmail.com>
date Mon, 08 Oct 2018 16:27:40 -0700
parents b1fb341d8a61
children 675775c33ab6
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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 #include "zstd_compress_internal.h"
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12 #include "zstd_fast.h"
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13
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14
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15 void ZSTD_fillHashTable(ZSTD_matchState_t* ms,
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16 void const* end, ZSTD_dictTableLoadMethod_e dtlm)
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17 {
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18 const ZSTD_compressionParameters* const cParams = &ms->cParams;
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19 U32* const hashTable = ms->hashTable;
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20 U32 const hBits = cParams->hashLog;
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21 U32 const mls = cParams->searchLength;
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22 const BYTE* const base = ms->window.base;
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23 const BYTE* ip = base + ms->nextToUpdate;
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24 const BYTE* const iend = ((const BYTE*)end) - HASH_READ_SIZE;
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25 const U32 fastHashFillStep = 3;
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26
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27 /* Always insert every fastHashFillStep position into the hash table.
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28 * Insert the other positions if their hash entry is empty.
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29 */
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30 for (; ip + fastHashFillStep - 1 <= iend; ip += fastHashFillStep) {
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31 U32 const current = (U32)(ip - base);
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32 U32 i;
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33 for (i = 0; i < fastHashFillStep; ++i) {
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34 size_t const hash = ZSTD_hashPtr(ip + i, hBits, mls);
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35 if (i == 0 || hashTable[hash] == 0)
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36 hashTable[hash] = current + i;
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37 /* Only load extra positions for ZSTD_dtlm_full */
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38 if (dtlm == ZSTD_dtlm_fast)
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39 break;
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40 }
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41 }
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42 }
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43
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44 FORCE_INLINE_TEMPLATE
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45 size_t ZSTD_compressBlock_fast_generic(
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46 ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
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47 void const* src, size_t srcSize,
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48 U32 const mls, ZSTD_dictMode_e const dictMode)
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49 {
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50 const ZSTD_compressionParameters* const cParams = &ms->cParams;
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51 U32* const hashTable = ms->hashTable;
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52 U32 const hlog = cParams->hashLog;
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53 /* support stepSize of 0 */
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54 U32 const stepSize = cParams->targetLength + !(cParams->targetLength);
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55 const BYTE* const base = ms->window.base;
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56 const BYTE* const istart = (const BYTE*)src;
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57 const BYTE* ip = istart;
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58 const BYTE* anchor = istart;
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59 const U32 prefixStartIndex = ms->window.dictLimit;
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60 const BYTE* const prefixStart = base + prefixStartIndex;
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61 const BYTE* const iend = istart + srcSize;
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62 const BYTE* const ilimit = iend - HASH_READ_SIZE;
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63 U32 offset_1=rep[0], offset_2=rep[1];
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64 U32 offsetSaved = 0;
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65
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66 const ZSTD_matchState_t* const dms = ms->dictMatchState;
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67 const ZSTD_compressionParameters* const dictCParams =
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68 dictMode == ZSTD_dictMatchState ?
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69 &dms->cParams : NULL;
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70 const U32* const dictHashTable = dictMode == ZSTD_dictMatchState ?
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71 dms->hashTable : NULL;
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72 const U32 dictStartIndex = dictMode == ZSTD_dictMatchState ?
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73 dms->window.dictLimit : 0;
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74 const BYTE* const dictBase = dictMode == ZSTD_dictMatchState ?
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75 dms->window.base : NULL;
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76 const BYTE* const dictStart = dictMode == ZSTD_dictMatchState ?
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77 dictBase + dictStartIndex : NULL;
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78 const BYTE* const dictEnd = dictMode == ZSTD_dictMatchState ?
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79 dms->window.nextSrc : NULL;
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80 const U32 dictIndexDelta = dictMode == ZSTD_dictMatchState ?
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81 prefixStartIndex - (U32)(dictEnd - dictBase) :
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82 0;
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83 const U32 dictAndPrefixLength = (U32)(ip - prefixStart + dictEnd - dictStart);
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84 const U32 dictHLog = dictMode == ZSTD_dictMatchState ?
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85 dictCParams->hashLog : hlog;
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86
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87 assert(dictMode == ZSTD_noDict || dictMode == ZSTD_dictMatchState);
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88
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89 /* otherwise, we would get index underflow when translating a dict index
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90 * into a local index */
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91 assert(dictMode != ZSTD_dictMatchState
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92 || prefixStartIndex >= (U32)(dictEnd - dictBase));
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93
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94 /* init */
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95 ip += (dictAndPrefixLength == 0);
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96 if (dictMode == ZSTD_noDict) {
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97 U32 const maxRep = (U32)(ip - prefixStart);
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98 if (offset_2 > maxRep) offsetSaved = offset_2, offset_2 = 0;
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99 if (offset_1 > maxRep) offsetSaved = offset_1, offset_1 = 0;
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100 }
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101 if (dictMode == ZSTD_dictMatchState) {
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102 /* dictMatchState repCode checks don't currently handle repCode == 0
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103 * disabling. */
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104 assert(offset_1 <= dictAndPrefixLength);
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105 assert(offset_2 <= dictAndPrefixLength);
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106 }
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107
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108 /* Main Search Loop */
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109 while (ip < ilimit) { /* < instead of <=, because repcode check at (ip+1) */
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110 size_t mLength;
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111 size_t const h = ZSTD_hashPtr(ip, hlog, mls);
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112 U32 const current = (U32)(ip-base);
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113 U32 const matchIndex = hashTable[h];
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114 const BYTE* match = base + matchIndex;
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115 const U32 repIndex = current + 1 - offset_1;
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116 const BYTE* repMatch = (dictMode == ZSTD_dictMatchState
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117 && repIndex < prefixStartIndex) ?
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118 dictBase + (repIndex - dictIndexDelta) :
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119 base + repIndex;
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120 hashTable[h] = current; /* update hash table */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
121
40121
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
122 if ( (dictMode == ZSTD_dictMatchState)
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
123 && ((U32)((prefixStartIndex-1) - repIndex) >= 3) /* intentional underflow : ensure repIndex isn't overlapping dict + prefix */
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
124 && (MEM_read32(repMatch) == MEM_read32(ip+1)) ) {
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
125 const BYTE* const repMatchEnd = repIndex < prefixStartIndex ? dictEnd : iend;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
126 mLength = ZSTD_count_2segments(ip+1+4, repMatch+4, iend, repMatchEnd, prefixStart) + 4;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
127 ip++;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
128 ZSTD_storeSeq(seqStore, ip-anchor, anchor, 0, mLength-MINMATCH);
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
129 } else if ( dictMode == ZSTD_noDict
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
130 && ((offset_1 > 0) & (MEM_read32(ip+1-offset_1) == MEM_read32(ip+1)))) {
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
131 mLength = ZSTD_count(ip+1+4, ip+1+4-offset_1, iend) + 4;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
132 ip++;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
133 ZSTD_storeSeq(seqStore, ip-anchor, anchor, 0, mLength-MINMATCH);
40121
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
134 } else if ( (matchIndex <= prefixStartIndex) ) {
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
135 if (dictMode == ZSTD_dictMatchState) {
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
136 size_t const dictHash = ZSTD_hashPtr(ip, dictHLog, mls);
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
137 U32 const dictMatchIndex = dictHashTable[dictHash];
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
138 const BYTE* dictMatch = dictBase + dictMatchIndex;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
139 if (dictMatchIndex <= dictStartIndex ||
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
140 MEM_read32(dictMatch) != MEM_read32(ip)) {
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
141 assert(stepSize >= 1);
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
142 ip += ((ip-anchor) >> kSearchStrength) + stepSize;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
143 continue;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
144 } else {
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
145 /* found a dict match */
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
146 U32 const offset = (U32)(current-dictMatchIndex-dictIndexDelta);
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
147 mLength = ZSTD_count_2segments(ip+4, dictMatch+4, iend, dictEnd, prefixStart) + 4;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
148 while (((ip>anchor) & (dictMatch>dictStart))
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
149 && (ip[-1] == dictMatch[-1])) {
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
150 ip--; dictMatch--; mLength++;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
151 } /* catch up */
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
152 offset_2 = offset_1;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
153 offset_1 = offset;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
154 ZSTD_storeSeq(seqStore, ip-anchor, anchor, offset + ZSTD_REP_MOVE, mLength-MINMATCH);
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
155 }
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
156 } else {
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
157 assert(stepSize >= 1);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
158 ip += ((ip-anchor) >> kSearchStrength) + stepSize;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
159 continue;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
160 }
40121
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
161 } else if (MEM_read32(match) != MEM_read32(ip)) {
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
162 /* it's not a match, and we're not going to check the dictionary */
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
163 assert(stepSize >= 1);
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
164 ip += ((ip-anchor) >> kSearchStrength) + stepSize;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
165 continue;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
166 } else {
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
167 /* found a regular match */
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
168 U32 const offset = (U32)(ip-match);
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
169 mLength = ZSTD_count(ip+4, match+4, iend) + 4;
40121
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
170 while (((ip>anchor) & (match>prefixStart))
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
171 && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
172 offset_2 = offset_1;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
173 offset_1 = offset;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
174 ZSTD_storeSeq(seqStore, ip-anchor, anchor, offset + ZSTD_REP_MOVE, mLength-MINMATCH);
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
175 }
37495
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
176
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
177 /* match found */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
178 ip += mLength;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
179 anchor = ip;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
180
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
181 if (ip <= ilimit) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
182 /* Fill Table */
40121
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
183 assert(base+current+2 > istart); /* check base overflow */
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
184 hashTable[ZSTD_hashPtr(base+current+2, hlog, mls)] = current+2; /* here because current+2 could be > iend-8 */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
185 hashTable[ZSTD_hashPtr(ip-2, hlog, mls)] = (U32)(ip-2-base);
40121
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
186
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
187 /* check immediate repcode */
40121
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
188 if (dictMode == ZSTD_dictMatchState) {
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
189 while (ip <= ilimit) {
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
190 U32 const current2 = (U32)(ip-base);
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
191 U32 const repIndex2 = current2 - offset_2;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
192 const BYTE* repMatch2 = repIndex2 < prefixStartIndex ?
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
193 dictBase - dictIndexDelta + repIndex2 :
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
194 base + repIndex2;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
195 if ( ((U32)((prefixStartIndex-1) - (U32)repIndex2) >= 3 /* intentional overflow */)
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
196 && (MEM_read32(repMatch2) == MEM_read32(ip)) ) {
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
197 const BYTE* const repEnd2 = repIndex2 < prefixStartIndex ? dictEnd : iend;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
198 size_t const repLength2 = ZSTD_count_2segments(ip+4, repMatch2+4, iend, repEnd2, prefixStart) + 4;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
199 U32 tmpOffset = offset_2; offset_2 = offset_1; offset_1 = tmpOffset; /* swap offset_2 <=> offset_1 */
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
200 ZSTD_storeSeq(seqStore, 0, anchor, 0, repLength2-MINMATCH);
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
201 hashTable[ZSTD_hashPtr(ip, hlog, mls)] = current2;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
202 ip += repLength2;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
203 anchor = ip;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
204 continue;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
205 }
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
206 break;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
207 }
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
208 }
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
209
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
210 if (dictMode == ZSTD_noDict) {
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
211 while ( (ip <= ilimit)
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
212 && ( (offset_2>0)
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
213 & (MEM_read32(ip) == MEM_read32(ip - offset_2)) )) {
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
214 /* store sequence */
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
215 size_t const rLength = ZSTD_count(ip+4, ip+4-offset_2, iend) + 4;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
216 U32 const tmpOff = offset_2; offset_2 = offset_1; offset_1 = tmpOff; /* swap offset_2 <=> offset_1 */
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
217 hashTable[ZSTD_hashPtr(ip, hlog, mls)] = (U32)(ip-base);
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
218 ZSTD_storeSeq(seqStore, 0, anchor, 0, rLength-MINMATCH);
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
219 ip += rLength;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
220 anchor = ip;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
221 continue; /* faster when present ... (?) */
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
222 } } } }
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
223
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
224 /* save reps for next block */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
225 rep[0] = offset_1 ? offset_1 : offsetSaved;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
226 rep[1] = offset_2 ? offset_2 : offsetSaved;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
227
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
228 /* Return the last literals size */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
229 return iend - anchor;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
230 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
231
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
232
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
233 size_t ZSTD_compressBlock_fast(
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
234 ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
40121
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
235 void const* src, size_t srcSize)
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
236 {
40121
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
237 ZSTD_compressionParameters const* cParams = &ms->cParams;
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
238 U32 const mls = cParams->searchLength;
40121
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
239 assert(ms->dictMatchState == NULL);
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
240 switch(mls)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
241 {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
242 default: /* includes case 3 */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
243 case 4 :
40121
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
244 return ZSTD_compressBlock_fast_generic(ms, seqStore, rep, src, srcSize, 4, ZSTD_noDict);
37495
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
245 case 5 :
40121
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
246 return ZSTD_compressBlock_fast_generic(ms, seqStore, rep, src, srcSize, 5, ZSTD_noDict);
37495
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
247 case 6 :
40121
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
248 return ZSTD_compressBlock_fast_generic(ms, seqStore, rep, src, srcSize, 6, ZSTD_noDict);
37495
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
249 case 7 :
40121
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
250 return ZSTD_compressBlock_fast_generic(ms, seqStore, rep, src, srcSize, 7, ZSTD_noDict);
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
251 }
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
252 }
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
253
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
254 size_t ZSTD_compressBlock_fast_dictMatchState(
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
255 ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
256 void const* src, size_t srcSize)
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
257 {
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
258 ZSTD_compressionParameters const* cParams = &ms->cParams;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
259 U32 const mls = cParams->searchLength;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
260 assert(ms->dictMatchState != NULL);
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
261 switch(mls)
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
262 {
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
263 default: /* includes case 3 */
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
264 case 4 :
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
265 return ZSTD_compressBlock_fast_generic(ms, seqStore, rep, src, srcSize, 4, ZSTD_dictMatchState);
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
266 case 5 :
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
267 return ZSTD_compressBlock_fast_generic(ms, seqStore, rep, src, srcSize, 5, ZSTD_dictMatchState);
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
268 case 6 :
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
269 return ZSTD_compressBlock_fast_generic(ms, seqStore, rep, src, srcSize, 6, ZSTD_dictMatchState);
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
270 case 7 :
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
271 return ZSTD_compressBlock_fast_generic(ms, seqStore, rep, src, srcSize, 7, ZSTD_dictMatchState);
37495
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
272 }
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
273 }
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
274
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
275
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
276 static size_t ZSTD_compressBlock_fast_extDict_generic(
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
277 ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
40121
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
278 void const* src, size_t srcSize, U32 const mls)
37495
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
279 {
40121
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
280 const ZSTD_compressionParameters* const cParams = &ms->cParams;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
281 U32* const hashTable = ms->hashTable;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
282 U32 const hlog = cParams->hashLog;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
283 /* support stepSize of 0 */
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
284 U32 const stepSize = cParams->targetLength + !(cParams->targetLength);
37495
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
285 const BYTE* const base = ms->window.base;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
286 const BYTE* const dictBase = ms->window.dictBase;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
287 const BYTE* const istart = (const BYTE*)src;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
288 const BYTE* ip = istart;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
289 const BYTE* anchor = istart;
40121
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
290 const U32 dictStartIndex = ms->window.lowLimit;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
291 const BYTE* const dictStart = dictBase + dictStartIndex;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
292 const U32 prefixStartIndex = ms->window.dictLimit;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
293 const BYTE* const prefixStart = base + prefixStartIndex;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
294 const BYTE* const dictEnd = dictBase + prefixStartIndex;
37495
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
295 const BYTE* const iend = istart + srcSize;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
296 const BYTE* const ilimit = iend - 8;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
297 U32 offset_1=rep[0], offset_2=rep[1];
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
298
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
299 /* Search Loop */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
300 while (ip < ilimit) { /* < instead of <=, because (ip+1) */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
301 const size_t h = ZSTD_hashPtr(ip, hlog, mls);
40121
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
302 const U32 matchIndex = hashTable[h];
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
303 const BYTE* const matchBase = matchIndex < prefixStartIndex ? dictBase : base;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
304 const BYTE* match = matchBase + matchIndex;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
305 const U32 current = (U32)(ip-base);
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
306 const U32 repIndex = current + 1 - offset_1;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
307 const BYTE* const repBase = repIndex < prefixStartIndex ? dictBase : base;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
308 const BYTE* const repMatch = repBase + repIndex;
37495
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
309 size_t mLength;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
310 hashTable[h] = current; /* update hash table */
40121
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
311 assert(offset_1 <= current +1); /* check repIndex */
37495
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
312
40121
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
313 if ( (((U32)((prefixStartIndex-1) - repIndex) >= 3) /* intentional underflow */ & (repIndex > dictStartIndex))
37495
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
314 && (MEM_read32(repMatch) == MEM_read32(ip+1)) ) {
40121
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
315 const BYTE* repMatchEnd = repIndex < prefixStartIndex ? dictEnd : iend;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
316 mLength = ZSTD_count_2segments(ip+1+4, repMatch+4, iend, repMatchEnd, prefixStart) + 4;
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
317 ip++;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
318 ZSTD_storeSeq(seqStore, ip-anchor, anchor, 0, mLength-MINMATCH);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
319 } else {
40121
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
320 if ( (matchIndex < dictStartIndex) ||
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
321 (MEM_read32(match) != MEM_read32(ip)) ) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
322 assert(stepSize >= 1);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
323 ip += ((ip-anchor) >> kSearchStrength) + stepSize;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
324 continue;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
325 }
40121
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
326 { const BYTE* matchEnd = matchIndex < prefixStartIndex ? dictEnd : iend;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
327 const BYTE* lowMatchPtr = matchIndex < prefixStartIndex ? dictStart : prefixStart;
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
328 U32 offset;
40121
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
329 mLength = ZSTD_count_2segments(ip+4, match+4, iend, matchEnd, prefixStart) + 4;
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
330 while (((ip>anchor) & (match>lowMatchPtr)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
331 offset = current - matchIndex;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
332 offset_2 = offset_1;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
333 offset_1 = offset;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
334 ZSTD_storeSeq(seqStore, ip-anchor, anchor, offset + ZSTD_REP_MOVE, mLength-MINMATCH);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
335 } }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
336
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
337 /* found a match : store it */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
338 ip += mLength;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
339 anchor = ip;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
340
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
341 if (ip <= ilimit) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
342 /* Fill Table */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
343 hashTable[ZSTD_hashPtr(base+current+2, hlog, mls)] = current+2;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
344 hashTable[ZSTD_hashPtr(ip-2, hlog, mls)] = (U32)(ip-2-base);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
345 /* check immediate repcode */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
346 while (ip <= ilimit) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
347 U32 const current2 = (U32)(ip-base);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
348 U32 const repIndex2 = current2 - offset_2;
40121
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
349 const BYTE* repMatch2 = repIndex2 < prefixStartIndex ? dictBase + repIndex2 : base + repIndex2;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
350 if ( (((U32)((prefixStartIndex-1) - repIndex2) >= 3) & (repIndex2 > dictStartIndex)) /* intentional overflow */
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
351 && (MEM_read32(repMatch2) == MEM_read32(ip)) ) {
40121
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
352 const BYTE* const repEnd2 = repIndex2 < prefixStartIndex ? dictEnd : iend;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
353 size_t const repLength2 = ZSTD_count_2segments(ip+4, repMatch2+4, iend, repEnd2, prefixStart) + 4;
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
354 U32 tmpOffset = offset_2; offset_2 = offset_1; offset_1 = tmpOffset; /* swap offset_2 <=> offset_1 */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
355 ZSTD_storeSeq(seqStore, 0, anchor, 0, repLength2-MINMATCH);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
356 hashTable[ZSTD_hashPtr(ip, hlog, mls)] = current2;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
357 ip += repLength2;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
358 anchor = ip;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
359 continue;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
360 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
361 break;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
362 } } }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
363
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
364 /* save reps for next block */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
365 rep[0] = offset_1;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
366 rep[1] = offset_2;
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367
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368 /* Return the last literals size */
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369 return iend - anchor;
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370 }
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371
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372
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373 size_t ZSTD_compressBlock_fast_extDict(
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374 ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
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375 void const* src, size_t srcSize)
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376 {
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377 ZSTD_compressionParameters const* cParams = &ms->cParams;
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378 U32 const mls = cParams->searchLength;
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379 switch(mls)
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380 {
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381 default: /* includes case 3 */
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382 case 4 :
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383 return ZSTD_compressBlock_fast_extDict_generic(ms, seqStore, rep, src, srcSize, 4);
37495
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384 case 5 :
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385 return ZSTD_compressBlock_fast_extDict_generic(ms, seqStore, rep, src, srcSize, 5);
37495
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386 case 6 :
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387 return ZSTD_compressBlock_fast_extDict_generic(ms, seqStore, rep, src, srcSize, 6);
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388 case 7 :
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389 return ZSTD_compressBlock_fast_extDict_generic(ms, seqStore, rep, src, srcSize, 7);
37495
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390 }
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391 }