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annotate contrib/python-zstandard/zstd/compress/zstd_double_fast.c @ 37495:b1fb341d8a61

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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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37495
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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_double_fast.h"
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13
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14
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15 void ZSTD_fillDoubleHashTable(ZSTD_matchState_t* ms,
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16 ZSTD_compressionParameters const* cParams,
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17 void const* end)
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18 {
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19 U32* const hashLarge = ms->hashTable;
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20 U32 const hBitsL = cParams->hashLog;
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21 U32 const mls = cParams->searchLength;
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22 U32* const hashSmall = ms->chainTable;
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23 U32 const hBitsS = cParams->chainLog;
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24 const BYTE* const base = ms->window.base;
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25 const BYTE* ip = base + ms->nextToUpdate;
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26 const BYTE* const iend = ((const BYTE*)end) - HASH_READ_SIZE;
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27 const U32 fastHashFillStep = 3;
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28
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29 /* Always insert every fastHashFillStep position into the hash tables.
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30 * Insert the other positions into the large hash table if their entry
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31 * is empty.
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32 */
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33 for (; ip + fastHashFillStep - 1 <= iend; ip += fastHashFillStep) {
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34 U32 const current = (U32)(ip - base);
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35 U32 i;
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36 for (i = 0; i < fastHashFillStep; ++i) {
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37 size_t const smHash = ZSTD_hashPtr(ip + i, hBitsS, mls);
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38 size_t const lgHash = ZSTD_hashPtr(ip + i, hBitsL, 8);
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39 if (i == 0)
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40 hashSmall[smHash] = current + i;
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41 if (i == 0 || hashLarge[lgHash] == 0)
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42 hashLarge[lgHash] = current + i;
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43 }
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44 }
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45 }
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46
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47
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48 FORCE_INLINE_TEMPLATE
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49 size_t ZSTD_compressBlock_doubleFast_generic(
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50 ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
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51 ZSTD_compressionParameters const* cParams, void const* src, size_t srcSize,
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52 U32 const mls /* template */)
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53 {
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54 U32* const hashLong = ms->hashTable;
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55 const U32 hBitsL = cParams->hashLog;
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56 U32* const hashSmall = ms->chainTable;
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57 const U32 hBitsS = cParams->chainLog;
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58 const BYTE* const base = ms->window.base;
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59 const BYTE* const istart = (const BYTE*)src;
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60 const BYTE* ip = istart;
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61 const BYTE* anchor = istart;
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62 const U32 lowestIndex = ms->window.dictLimit;
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63 const BYTE* const lowest = base + lowestIndex;
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64 const BYTE* const iend = istart + srcSize;
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65 const BYTE* const ilimit = iend - HASH_READ_SIZE;
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66 U32 offset_1=rep[0], offset_2=rep[1];
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67 U32 offsetSaved = 0;
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68
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69 /* init */
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70 ip += (ip==lowest);
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71 { U32 const maxRep = (U32)(ip-lowest);
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72 if (offset_2 > maxRep) offsetSaved = offset_2, offset_2 = 0;
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73 if (offset_1 > maxRep) offsetSaved = offset_1, offset_1 = 0;
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74 }
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75
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76 /* Main Search Loop */
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77 while (ip < ilimit) { /* < instead of <=, because repcode check at (ip+1) */
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78 size_t mLength;
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79 size_t const h2 = ZSTD_hashPtr(ip, hBitsL, 8);
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80 size_t const h = ZSTD_hashPtr(ip, hBitsS, mls);
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81 U32 const current = (U32)(ip-base);
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82 U32 const matchIndexL = hashLong[h2];
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83 U32 const matchIndexS = hashSmall[h];
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84 const BYTE* matchLong = base + matchIndexL;
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85 const BYTE* match = base + matchIndexS;
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86 hashLong[h2] = hashSmall[h] = current; /* update hash tables */
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87
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88 assert(offset_1 <= current); /* supposed guaranteed by construction */
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89 if ((offset_1 > 0) & (MEM_read32(ip+1-offset_1) == MEM_read32(ip+1))) {
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90 /* favor repcode */
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91 mLength = ZSTD_count(ip+1+4, ip+1+4-offset_1, iend) + 4;
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92 ip++;
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93 ZSTD_storeSeq(seqStore, ip-anchor, anchor, 0, mLength-MINMATCH);
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94 } else {
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95 U32 offset;
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96 if ( (matchIndexL > lowestIndex) && (MEM_read64(matchLong) == MEM_read64(ip)) ) {
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97 mLength = ZSTD_count(ip+8, matchLong+8, iend) + 8;
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98 offset = (U32)(ip-matchLong);
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99 while (((ip>anchor) & (matchLong>lowest)) && (ip[-1] == matchLong[-1])) { ip--; matchLong--; mLength++; } /* catch up */
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100 } else if ( (matchIndexS > lowestIndex) && (MEM_read32(match) == MEM_read32(ip)) ) {
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101 size_t const hl3 = ZSTD_hashPtr(ip+1, hBitsL, 8);
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102 U32 const matchIndexL3 = hashLong[hl3];
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103 const BYTE* matchL3 = base + matchIndexL3;
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104 hashLong[hl3] = current + 1;
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105 if ( (matchIndexL3 > lowestIndex) && (MEM_read64(matchL3) == MEM_read64(ip+1)) ) {
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106 mLength = ZSTD_count(ip+9, matchL3+8, iend) + 8;
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107 ip++;
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108 offset = (U32)(ip-matchL3);
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109 while (((ip>anchor) & (matchL3>lowest)) && (ip[-1] == matchL3[-1])) { ip--; matchL3--; mLength++; } /* catch up */
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110 } else {
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111 mLength = ZSTD_count(ip+4, match+4, iend) + 4;
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112 offset = (U32)(ip-match);
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113 while (((ip>anchor) & (match>lowest)) && (ip[-1] == match[-1])) { ip--; match--; mLength++; } /* catch up */
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114 }
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115 } else {
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116 ip += ((ip-anchor) >> kSearchStrength) + 1;
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117 continue;
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118 }
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119
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120 offset_2 = offset_1;
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121 offset_1 = offset;
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diff changeset
122
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
123 ZSTD_storeSeq(seqStore, ip-anchor, anchor, offset + ZSTD_REP_MOVE, mLength-MINMATCH);
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
124 }
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
125
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
126 /* match found */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
127 ip += mLength;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
128 anchor = ip;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
129
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
130 if (ip <= ilimit) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
131 /* Fill Table */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
132 hashLong[ZSTD_hashPtr(base+current+2, hBitsL, 8)] =
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
133 hashSmall[ZSTD_hashPtr(base+current+2, hBitsS, mls)] = current+2; /* here because current+2 could be > iend-8 */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
134 hashLong[ZSTD_hashPtr(ip-2, hBitsL, 8)] =
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
135 hashSmall[ZSTD_hashPtr(ip-2, hBitsS, mls)] = (U32)(ip-2-base);
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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 /* check immediate repcode */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
138 while ( (ip <= ilimit)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
139 && ( (offset_2>0)
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
140 & (MEM_read32(ip) == MEM_read32(ip - offset_2)) )) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
141 /* store sequence */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
142 size_t const rLength = ZSTD_count(ip+4, ip+4-offset_2, iend) + 4;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
143 { U32 const tmpOff = offset_2; offset_2 = offset_1; offset_1 = tmpOff; } /* swap offset_2 <=> offset_1 */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
144 hashSmall[ZSTD_hashPtr(ip, hBitsS, mls)] = (U32)(ip-base);
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
145 hashLong[ZSTD_hashPtr(ip, hBitsL, 8)] = (U32)(ip-base);
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
146 ZSTD_storeSeq(seqStore, 0, anchor, 0, rLength-MINMATCH);
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
147 ip += rLength;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
148 anchor = ip;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
149 continue; /* faster when present ... (?) */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
150 } } }
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
151
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
152 /* save reps for next block */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
153 rep[0] = offset_1 ? offset_1 : offsetSaved;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
154 rep[1] = offset_2 ? offset_2 : offsetSaved;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
155
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
156 /* Return the last literals size */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
157 return iend - anchor;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
158 }
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
159
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
160
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
161 size_t ZSTD_compressBlock_doubleFast(
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
162 ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
163 ZSTD_compressionParameters const* cParams, void const* src, size_t srcSize)
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
164 {
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
165 const U32 mls = cParams->searchLength;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
166 switch(mls)
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
167 {
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
168 default: /* includes case 3 */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
169 case 4 :
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
170 return ZSTD_compressBlock_doubleFast_generic(ms, seqStore, rep, cParams, src, srcSize, 4);
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
171 case 5 :
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
172 return ZSTD_compressBlock_doubleFast_generic(ms, seqStore, rep, cParams, src, srcSize, 5);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
173 case 6 :
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
174 return ZSTD_compressBlock_doubleFast_generic(ms, seqStore, rep, cParams, src, srcSize, 6);
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
175 case 7 :
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
176 return ZSTD_compressBlock_doubleFast_generic(ms, seqStore, rep, cParams, src, srcSize, 7);
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
177 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
178 }
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
179
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
180
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
181 static size_t ZSTD_compressBlock_doubleFast_extDict_generic(
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
182 ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
183 ZSTD_compressionParameters const* cParams, void const* src, size_t srcSize,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
184 U32 const mls /* template */)
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
185 {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
186 U32* const hashLong = ms->hashTable;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
187 U32 const hBitsL = cParams->hashLog;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
188 U32* const hashSmall = ms->chainTable;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
189 U32 const hBitsS = cParams->chainLog;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
190 const BYTE* const base = ms->window.base;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
191 const BYTE* const dictBase = ms->window.dictBase;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
192 const BYTE* const istart = (const BYTE*)src;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
193 const BYTE* ip = istart;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
194 const BYTE* anchor = istart;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
195 const U32 lowestIndex = ms->window.lowLimit;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
196 const BYTE* const dictStart = dictBase + lowestIndex;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
197 const U32 dictLimit = ms->window.dictLimit;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
198 const BYTE* const lowPrefixPtr = base + dictLimit;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
199 const BYTE* const dictEnd = dictBase + dictLimit;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
200 const BYTE* const iend = istart + srcSize;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
201 const BYTE* const ilimit = iend - 8;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
202 U32 offset_1=rep[0], offset_2=rep[1];
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
203
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
204 /* Search Loop */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
205 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
206 const size_t hSmall = ZSTD_hashPtr(ip, hBitsS, mls);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
207 const U32 matchIndex = hashSmall[hSmall];
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
208 const BYTE* matchBase = matchIndex < dictLimit ? dictBase : base;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
209 const BYTE* match = matchBase + matchIndex;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
210
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
211 const size_t hLong = ZSTD_hashPtr(ip, hBitsL, 8);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
212 const U32 matchLongIndex = hashLong[hLong];
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
213 const BYTE* matchLongBase = matchLongIndex < dictLimit ? dictBase : base;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
214 const BYTE* matchLong = matchLongBase + matchLongIndex;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
215
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
216 const U32 current = (U32)(ip-base);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
217 const U32 repIndex = current + 1 - offset_1; /* offset_1 expected <= current +1 */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
218 const BYTE* repBase = repIndex < dictLimit ? dictBase : base;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
219 const BYTE* repMatch = repBase + repIndex;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
220 size_t mLength;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
221 hashSmall[hSmall] = hashLong[hLong] = current; /* update hash table */
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
222
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
223 if ( (((U32)((dictLimit-1) - repIndex) >= 3) /* intentional underflow */ & (repIndex > lowestIndex))
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
224 && (MEM_read32(repMatch) == MEM_read32(ip+1)) ) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
225 const BYTE* repMatchEnd = repIndex < dictLimit ? dictEnd : iend;
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
226 mLength = ZSTD_count_2segments(ip+1+4, repMatch+4, iend, repMatchEnd, lowPrefixPtr) + 4;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
227 ip++;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
228 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
229 } else {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
230 if ((matchLongIndex > lowestIndex) && (MEM_read64(matchLong) == MEM_read64(ip))) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
231 const BYTE* matchEnd = matchLongIndex < dictLimit ? dictEnd : iend;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
232 const BYTE* lowMatchPtr = matchLongIndex < dictLimit ? dictStart : lowPrefixPtr;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
233 U32 offset;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
234 mLength = ZSTD_count_2segments(ip+8, matchLong+8, iend, matchEnd, lowPrefixPtr) + 8;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
235 offset = current - matchLongIndex;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
236 while (((ip>anchor) & (matchLong>lowMatchPtr)) && (ip[-1] == matchLong[-1])) { ip--; matchLong--; mLength++; } /* catch up */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
237 offset_2 = offset_1;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
238 offset_1 = offset;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
239 ZSTD_storeSeq(seqStore, ip-anchor, anchor, offset + ZSTD_REP_MOVE, mLength-MINMATCH);
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
240
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
241 } else if ((matchIndex > lowestIndex) && (MEM_read32(match) == MEM_read32(ip))) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
242 size_t const h3 = ZSTD_hashPtr(ip+1, hBitsL, 8);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
243 U32 const matchIndex3 = hashLong[h3];
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
244 const BYTE* const match3Base = matchIndex3 < dictLimit ? dictBase : base;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
245 const BYTE* match3 = match3Base + matchIndex3;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
246 U32 offset;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
247 hashLong[h3] = current + 1;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
248 if ( (matchIndex3 > lowestIndex) && (MEM_read64(match3) == MEM_read64(ip+1)) ) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
249 const BYTE* matchEnd = matchIndex3 < dictLimit ? dictEnd : iend;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
250 const BYTE* lowMatchPtr = matchIndex3 < dictLimit ? dictStart : lowPrefixPtr;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
251 mLength = ZSTD_count_2segments(ip+9, match3+8, iend, matchEnd, lowPrefixPtr) + 8;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
252 ip++;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
253 offset = current+1 - matchIndex3;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
254 while (((ip>anchor) & (match3>lowMatchPtr)) && (ip[-1] == match3[-1])) { ip--; match3--; mLength++; } /* catch up */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
255 } else {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
256 const BYTE* matchEnd = matchIndex < dictLimit ? dictEnd : iend;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
257 const BYTE* lowMatchPtr = matchIndex < dictLimit ? dictStart : lowPrefixPtr;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
258 mLength = ZSTD_count_2segments(ip+4, match+4, iend, matchEnd, lowPrefixPtr) + 4;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
259 offset = current - matchIndex;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
260 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
261 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
262 offset_2 = offset_1;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
263 offset_1 = offset;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
264 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
265
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
266 } else {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
267 ip += ((ip-anchor) >> kSearchStrength) + 1;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
268 continue;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
269 } }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
270
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
271 /* found a match : store it */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
272 ip += mLength;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
273 anchor = ip;
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 if (ip <= ilimit) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
276 /* Fill Table */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
277 hashSmall[ZSTD_hashPtr(base+current+2, hBitsS, mls)] = current+2;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
278 hashLong[ZSTD_hashPtr(base+current+2, hBitsL, 8)] = current+2;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
279 hashSmall[ZSTD_hashPtr(ip-2, hBitsS, mls)] = (U32)(ip-2-base);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
280 hashLong[ZSTD_hashPtr(ip-2, hBitsL, 8)] = (U32)(ip-2-base);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
281 /* check immediate repcode */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
282 while (ip <= ilimit) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
283 U32 const current2 = (U32)(ip-base);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
284 U32 const repIndex2 = current2 - offset_2;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
285 const BYTE* repMatch2 = repIndex2 < dictLimit ? dictBase + repIndex2 : base + repIndex2;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
286 if ( (((U32)((dictLimit-1) - repIndex2) >= 3) & (repIndex2 > lowestIndex)) /* intentional overflow */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
287 && (MEM_read32(repMatch2) == MEM_read32(ip)) ) {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
288 const BYTE* const repEnd2 = repIndex2 < dictLimit ? dictEnd : iend;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
289 size_t const repLength2 = ZSTD_count_2segments(ip+4, repMatch2+4, iend, repEnd2, lowPrefixPtr) + 4;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
290 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
291 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
292 hashSmall[ZSTD_hashPtr(ip, hBitsS, mls)] = current2;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
293 hashLong[ZSTD_hashPtr(ip, hBitsL, 8)] = current2;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
294 ip += repLength2;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
295 anchor = ip;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
296 continue;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
297 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
298 break;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
299 } } }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
300
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
301 /* save reps for next block */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
302 rep[0] = offset_1;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
303 rep[1] = offset_2;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
304
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
305 /* Return the last literals size */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
306 return iend - anchor;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
307 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
308
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
309
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
310 size_t ZSTD_compressBlock_doubleFast_extDict(
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
311 ZSTD_matchState_t* ms, seqStore_t* seqStore, U32 rep[ZSTD_REP_NUM],
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
312 ZSTD_compressionParameters const* cParams, void const* src, size_t srcSize)
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
313 {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
314 U32 const mls = cParams->searchLength;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
315 switch(mls)
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 default: /* includes case 3 */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
318 case 4 :
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
319 return ZSTD_compressBlock_doubleFast_extDict_generic(ms, seqStore, rep, cParams, src, srcSize, 4);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
320 case 5 :
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
321 return ZSTD_compressBlock_doubleFast_extDict_generic(ms, seqStore, rep, cParams, src, srcSize, 5);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
322 case 6 :
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
323 return ZSTD_compressBlock_doubleFast_extDict_generic(ms, seqStore, rep, cParams, src, srcSize, 6);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
324 case 7 :
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
325 return ZSTD_compressBlock_doubleFast_extDict_generic(ms, seqStore, rep, cParams, src, srcSize, 7);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
326 }
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
327 }