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annotate contrib/python-zstandard/zstd/common/zstd_internal.h @ 42070:675775c33ab6

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zstandard: vendor python-zstandard 0.11 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. The project contains a vendored copy of zstandard 1.3.8. The old version was 1.3.6. This should result in some minor performance wins. test-check-py3-compat.t was updated to reflect now-passing tests on Python 3.8. Some HTTP tests were updated to reflect new zstd compression output. # no-check-commit because 3rd party code has different style guidelines Differential Revision: https://phab.mercurial-scm.org/D6199
author Gregory Szorc <gregory.szorc@gmail.com>
date Thu, 04 Apr 2019 17:34:43 -0700
parents 73fef626dae3
children 69de49c4e39c
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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 #ifndef ZSTD_CCOMMON_H_MODULE
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12 #define ZSTD_CCOMMON_H_MODULE
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13
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14 /* this module contains definitions which must be identical
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15 * across compression, decompression and dictBuilder.
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16 * It also contains a few functions useful to at least 2 of them
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17 * and which benefit from being inlined */
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18
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19 /*-*************************************
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20 * Dependencies
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21 ***************************************/
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22 #include "compiler.h"
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23 #include "mem.h"
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24 #include "debug.h" /* assert, DEBUGLOG, RAWLOG, g_debuglevel */
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25 #include "error_private.h"
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26 #define ZSTD_STATIC_LINKING_ONLY
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27 #include "zstd.h"
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28 #define FSE_STATIC_LINKING_ONLY
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29 #include "fse.h"
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30 #define HUF_STATIC_LINKING_ONLY
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31 #include "huf.h"
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32 #ifndef XXH_STATIC_LINKING_ONLY
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33 # define XXH_STATIC_LINKING_ONLY /* XXH64_state_t */
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34 #endif
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35 #include "xxhash.h" /* XXH_reset, update, digest */
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36
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37
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38 #if defined (__cplusplus)
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39 extern "C" {
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40 #endif
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41
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42 /* ---- static assert (debug) --- */
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43 #define ZSTD_STATIC_ASSERT(c) DEBUG_STATIC_ASSERT(c)
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44 #define ZSTD_isError ERR_isError /* for inlining */
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45 #define FSE_isError ERR_isError
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46 #define HUF_isError ERR_isError
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47
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48
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49 /*-*************************************
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50 * shared macros
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51 ***************************************/
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52 #undef MIN
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53 #undef MAX
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54 #define MIN(a,b) ((a)<(b) ? (a) : (b))
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55 #define MAX(a,b) ((a)>(b) ? (a) : (b))
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56 #define CHECK_F(f) { size_t const errcod = f; if (ERR_isError(errcod)) return errcod; } /* check and Forward error code */
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57 #define CHECK_E(f, e) { size_t const errcod = f; if (ERR_isError(errcod)) return ERROR(e); } /* check and send Error code */
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58
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59
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60 /*-*************************************
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61 * Common constants
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62 ***************************************/
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63 #define ZSTD_OPT_NUM (1<<12)
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64
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65 #define ZSTD_REP_NUM 3 /* number of repcodes */
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66 #define ZSTD_REP_MOVE (ZSTD_REP_NUM-1)
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67 static const U32 repStartValue[ZSTD_REP_NUM] = { 1, 4, 8 };
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68
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69 #define KB *(1 <<10)
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70 #define MB *(1 <<20)
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71 #define GB *(1U<<30)
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72
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73 #define BIT7 128
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74 #define BIT6 64
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75 #define BIT5 32
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76 #define BIT4 16
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77 #define BIT1 2
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78 #define BIT0 1
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79
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80 #define ZSTD_WINDOWLOG_ABSOLUTEMIN 10
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81 static const size_t ZSTD_fcs_fieldSize[4] = { 0, 2, 4, 8 };
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82 static const size_t ZSTD_did_fieldSize[4] = { 0, 1, 2, 4 };
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83
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84 #define ZSTD_FRAMEIDSIZE 4 /* magic number size */
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85
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86 #define ZSTD_BLOCKHEADERSIZE 3 /* C standard doesn't allow `static const` variable to be init using another `static const` variable */
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87 static const size_t ZSTD_blockHeaderSize = ZSTD_BLOCKHEADERSIZE;
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88 typedef enum { bt_raw, bt_rle, bt_compressed, bt_reserved } blockType_e;
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89
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90 #define MIN_SEQUENCES_SIZE 1 /* nbSeq==0 */
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91 #define MIN_CBLOCK_SIZE (1 /*litCSize*/ + 1 /* RLE or RAW */ + MIN_SEQUENCES_SIZE /* nbSeq==0 */) /* for a non-null block */
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92
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93 #define HufLog 12
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94 typedef enum { set_basic, set_rle, set_compressed, set_repeat } symbolEncodingType_e;
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96 #define LONGNBSEQ 0x7F00
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97
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98 #define MINMATCH 3
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99
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100 #define Litbits 8
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101 #define MaxLit ((1<<Litbits) - 1)
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102 #define MaxML 52
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103 #define MaxLL 35
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104 #define DefaultMaxOff 28
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105 #define MaxOff 31
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106 #define MaxSeq MAX(MaxLL, MaxML) /* Assumption : MaxOff < MaxLL,MaxML */
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107 #define MLFSELog 9
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108 #define LLFSELog 9
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109 #define OffFSELog 8
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110 #define MaxFSELog MAX(MAX(MLFSELog, LLFSELog), OffFSELog)
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111
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112 static const U32 LL_bits[MaxLL+1] = { 0, 0, 0, 0, 0, 0, 0, 0,
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113 0, 0, 0, 0, 0, 0, 0, 0,
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114 1, 1, 1, 1, 2, 2, 3, 3,
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115 4, 6, 7, 8, 9,10,11,12,
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116 13,14,15,16 };
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117 static const S16 LL_defaultNorm[MaxLL+1] = { 4, 3, 2, 2, 2, 2, 2, 2,
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118 2, 2, 2, 2, 2, 1, 1, 1,
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119 2, 2, 2, 2, 2, 2, 2, 2,
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120 2, 3, 2, 1, 1, 1, 1, 1,
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121 -1,-1,-1,-1 };
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122 #define LL_DEFAULTNORMLOG 6 /* for static allocation */
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123 static const U32 LL_defaultNormLog = LL_DEFAULTNORMLOG;
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124
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
125 static const U32 ML_bits[MaxML+1] = { 0, 0, 0, 0, 0, 0, 0, 0,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
126 0, 0, 0, 0, 0, 0, 0, 0,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
127 0, 0, 0, 0, 0, 0, 0, 0,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
128 0, 0, 0, 0, 0, 0, 0, 0,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
129 1, 1, 1, 1, 2, 2, 3, 3,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
130 4, 4, 5, 7, 8, 9,10,11,
30434
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
131 12,13,14,15,16 };
37495
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
132 static const S16 ML_defaultNorm[MaxML+1] = { 1, 4, 3, 2, 2, 2, 2, 2,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
133 2, 1, 1, 1, 1, 1, 1, 1,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
134 1, 1, 1, 1, 1, 1, 1, 1,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
135 1, 1, 1, 1, 1, 1, 1, 1,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
136 1, 1, 1, 1, 1, 1, 1, 1,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
137 1, 1, 1, 1, 1, 1,-1,-1,
30434
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
138 -1,-1,-1,-1,-1 };
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
139 #define ML_DEFAULTNORMLOG 6 /* for static allocation */
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
140 static const U32 ML_defaultNormLog = ML_DEFAULTNORMLOG;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
141
37495
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
142 static const S16 OF_defaultNorm[DefaultMaxOff+1] = { 1, 1, 1, 1, 1, 1, 2, 2,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
143 2, 1, 1, 1, 1, 1, 1, 1,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
144 1, 1, 1, 1, 1, 1, 1, 1,
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
145 -1,-1,-1,-1,-1 };
30434
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
146 #define OF_DEFAULTNORMLOG 5 /* for static allocation */
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
147 static const U32 OF_defaultNormLog = OF_DEFAULTNORMLOG;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
148
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
149
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
150 /*-*******************************************
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
151 * Shared functions to include for inlining
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
152 *********************************************/
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
153 static void ZSTD_copy8(void* dst, const void* src) { memcpy(dst, src, 8); }
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
154 #define COPY8(d,s) { ZSTD_copy8(d,s); d+=8; s+=8; }
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
155
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
156 /*! ZSTD_wildcopy() :
37495
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
157 * custom version of memcpy(), can overwrite up to WILDCOPY_OVERLENGTH bytes (if length==0) */
30434
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
158 #define WILDCOPY_OVERLENGTH 8
30822
b54a2984cdd4 zstd: vendor python-zstandard 0.6.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30434
diff changeset
159 MEM_STATIC void ZSTD_wildcopy(void* dst, const void* src, ptrdiff_t length)
30434
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
160 {
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
161 const BYTE* ip = (const BYTE*)src;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
162 BYTE* op = (BYTE*)dst;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
163 BYTE* const oend = op + length;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
164 do
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
165 COPY8(op, ip)
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
166 while (op < oend);
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
167 }
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
168
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
169 MEM_STATIC void ZSTD_wildcopy_e(void* dst, const void* src, void* dstEnd) /* should be faster for decoding, but strangely, not verified on all platform */
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
170 {
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
171 const BYTE* ip = (const BYTE*)src;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
172 BYTE* op = (BYTE*)dst;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
173 BYTE* const oend = (BYTE*)dstEnd;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
174 do
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
175 COPY8(op, ip)
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
176 while (op < oend);
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
177 }
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
178
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
179
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
180 /*-*******************************************
37495
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
181 * Private declarations
30434
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
182 *********************************************/
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
183 typedef struct seqDef_s {
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
184 U32 offset;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
185 U16 litLength;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
186 U16 matchLength;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
187 } seqDef;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
188
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
189 typedef struct {
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
190 seqDef* sequencesStart;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
191 seqDef* sequences;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
192 BYTE* litStart;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
193 BYTE* lit;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
194 BYTE* llCode;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
195 BYTE* mlCode;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
196 BYTE* ofCode;
40121
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
197 size_t maxNbSeq;
73fef626dae3 zstandard: vendor python-zstandard 0.10.1
Gregory Szorc <gregory.szorc@gmail.com>
parents: 37495
diff changeset
198 size_t maxNbLit;
30434
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
199 U32 longLengthID; /* 0 == no longLength; 1 == Lit.longLength; 2 == Match.longLength; */
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
200 U32 longLengthPos;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
201 } seqStore_t;
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
202
37495
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
203 const seqStore_t* ZSTD_getSeqStore(const ZSTD_CCtx* ctx); /* compress & dictBuilder */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
204 void ZSTD_seqToCodes(const seqStore_t* seqStorePtr); /* compress, dictBuilder, decodeCorpus (shouldn't get its definition from here) */
30434
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
205
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
206 /* custom memory allocation functions */
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
207 void* ZSTD_malloc(size_t size, ZSTD_customMem customMem);
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
208 void* ZSTD_calloc(size_t size, ZSTD_customMem customMem);
30434
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
209 void ZSTD_free(void* ptr, ZSTD_customMem customMem);
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
210
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
211
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
212 MEM_STATIC U32 ZSTD_highbit32(U32 val) /* compress, dictBuilder, decodeCorpus */
30434
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
213 {
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
214 assert(val != 0);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
215 {
30434
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
216 # if defined(_MSC_VER) /* Visual */
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
217 unsigned long r=0;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
218 _BitScanReverse(&r, val);
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
219 return (unsigned)r;
30434
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
220 # elif defined(__GNUC__) && (__GNUC__ >= 3) /* GCC Intrinsic */
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
221 return 31 - __builtin_clz(val);
30434
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
222 # else /* Software version */
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
223 static const U32 DeBruijnClz[32] = { 0, 9, 1, 10, 13, 21, 2, 29, 11, 14, 16, 18, 22, 25, 3, 30, 8, 12, 20, 28, 15, 17, 24, 7, 19, 27, 23, 6, 26, 5, 4, 31 };
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
224 U32 v = val;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
225 v |= v >> 1;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
226 v |= v >> 2;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
227 v |= v >> 4;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
228 v |= v >> 8;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
229 v |= v >> 16;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
230 return DeBruijnClz[(v * 0x07C4ACDDU) >> 27];
30434
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
231 # endif
37495
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
232 }
30434
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
233 }
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
234
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff changeset
235
30895
c32454d69b85 zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30822
diff changeset
236 /* ZSTD_invalidateRepCodes() :
c32454d69b85 zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30822
diff changeset
237 * ensures next compression will not use repcodes from previous block.
c32454d69b85 zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30822
diff changeset
238 * Note : only works with regular variant;
c32454d69b85 zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30822
diff changeset
239 * do not use with extDict variant ! */
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
240 void ZSTD_invalidateRepCodes(ZSTD_CCtx* cctx); /* zstdmt, adaptive_compression (shouldn't get this definition from here) */
30895
c32454d69b85 zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30822
diff changeset
241
c32454d69b85 zstd: vendor python-zstandard 0.7.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30822
diff changeset
242
37495
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Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
243 typedef struct {
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
244 blockType_e blockType;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
245 U32 lastBlock;
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
246 U32 origSize;
42070
675775c33ab6 zstandard: vendor python-zstandard 0.11
Gregory Szorc <gregory.szorc@gmail.com>
parents: 40121
diff changeset
247 } blockProperties_t; /* declared here for decompress and fullbench */
37495
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
248
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
249 /*! ZSTD_getcBlockSize() :
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
250 * Provides the size of compressed block from block header `src` */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
251 /* Used by: decompress, fullbench (does not get its definition from here) */
b1fb341d8a61 zstandard: vendor python-zstandard 0.9.0
Gregory Szorc <gregory.szorc@gmail.com>
parents: 30895
diff changeset
252 size_t ZSTD_getcBlockSize(const void* src, size_t srcSize,
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253 blockProperties_t* bpPtr);
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254
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255 /*! ZSTD_decodeSeqHeaders() :
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256 * decode sequence header from src */
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257 /* Used by: decompress, fullbench (does not get its definition from here) */
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258 size_t ZSTD_decodeSeqHeaders(ZSTD_DCtx* dctx, int* nbSeqPtr,
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259 const void* src, size_t srcSize);
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260
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261
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262 #if defined (__cplusplus)
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263 }
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264 #endif
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265
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266 #endif /* ZSTD_CCOMMON_H_MODULE */