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annotate contrib/python-zstandard/zstd/common/huf.h @ 30895:c32454d69b85

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zstd: vendor python-zstandard 0.7.0 Commit 3054ae3a66112970a091d3939fee32c2d0c1a23e from https://github.com/indygreg/python-zstandard is imported without modifications (other than removing unwanted files). The vendored zstd library within has been upgraded from 1.1.2 to 1.1.3. This version introduced new APIs for threads, thread pools, multi-threaded compression, and a new dictionary builder (COVER). These features are not yet used by python-zstandard (or Mercurial for that matter). However, that will likely change in the next python-zstandard release (and I think there are opportunities for Mercurial to take advantage of the multi-threaded APIs). Relevant to Mercurial, the CFFI bindings are now fully implemented. This means zstd should "just work" with PyPy (although I haven't tried). The python-zstandard test suite also runs all tests against both the C extension and CFFI bindings to ensure feature parity. There is also a "decompress_content_dict_chain()" API. This was derived from discussions with Yann Collet on list about alternate ways of encoding delta chains. The change most relevant to Mercurial is a performance enhancement in the simple decompression API to reuse a data structure across operations. This makes decompression of multiple inputs significantly faster. (This scenario occurs when reading revlog delta chains, for example.) Using python-zstandard's bench.py to measure the performance difference... On changelog chunks in the mozilla-unified repo: decompress discrete decompress() reuse zctx 1.262243 wall; 1.260000 CPU; 1.260000 user; 0.000000 sys 170.43 MB/s (best of 3) 0.949106 wall; 0.950000 CPU; 0.950000 user; 0.000000 sys 226.66 MB/s (best of 4) decompress discrete dict decompress() reuse zctx 0.692170 wall; 0.690000 CPU; 0.690000 user; 0.000000 sys 310.80 MB/s (best of 5) 0.437088 wall; 0.440000 CPU; 0.440000 user; 0.000000 sys 492.17 MB/s (best of 7) On manifest chunks in the mozilla-unified repo: decompress discrete decompress() reuse zctx 1.367284 wall; 1.370000 CPU; 1.370000 user; 0.000000 sys 274.01 MB/s (best of 3) 1.086831 wall; 1.080000 CPU; 1.080000 user; 0.000000 sys 344.72 MB/s (best of 3) decompress discrete dict decompress() reuse zctx 0.993272 wall; 0.990000 CPU; 0.990000 user; 0.000000 sys 377.19 MB/s (best of 3) 0.678651 wall; 0.680000 CPU; 0.680000 user; 0.000000 sys 552.06 MB/s (best of 5) That should make reads on zstd revlogs a bit faster ;) # no-check-commit
author Gregory Szorc <gregory.szorc@gmail.com>
date Tue, 07 Feb 2017 23:24:47 -0800
parents b54a2984cdd4
children b1fb341d8a61
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1 /* ******************************************************************
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2 Huffman coder, part of New Generation Entropy library
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3 header file
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4 Copyright (C) 2013-2016, Yann Collet.
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5
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6 BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
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7
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8 Redistribution and use in source and binary forms, with or without
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9 modification, are permitted provided that the following conditions are
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10 met:
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12 * Redistributions of source code must retain the above copyright
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13 notice, this list of conditions and the following disclaimer.
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14 * Redistributions in binary form must reproduce the above
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15 copyright notice, this list of conditions and the following disclaimer
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16 in the documentation and/or other materials provided with the
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17 distribution.
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18
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19 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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20 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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21 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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22 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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23 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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24 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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25 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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26 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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27 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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28 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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29 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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30
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31 You can contact the author at :
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32 - Source repository : https://github.com/Cyan4973/FiniteStateEntropy
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33 ****************************************************************** */
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34 #ifndef HUF_H_298734234
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35 #define HUF_H_298734234
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36
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37 #if defined (__cplusplus)
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38 extern "C" {
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39 #endif
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41
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42 /* *** Dependencies *** */
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43 #include <stddef.h> /* size_t */
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44
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46 /* *** simple functions *** */
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47 /**
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48 HUF_compress() :
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49 Compress content from buffer 'src', of size 'srcSize', into buffer 'dst'.
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50 'dst' buffer must be already allocated.
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51 Compression runs faster if `dstCapacity` >= HUF_compressBound(srcSize).
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52 `srcSize` must be <= `HUF_BLOCKSIZE_MAX` == 128 KB.
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53 @return : size of compressed data (<= `dstCapacity`).
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54 Special values : if return == 0, srcData is not compressible => Nothing is stored within dst !!!
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55 if return == 1, srcData is a single repeated byte symbol (RLE compression).
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56 if HUF_isError(return), compression failed (more details using HUF_getErrorName())
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57 */
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58 size_t HUF_compress(void* dst, size_t dstCapacity,
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59 const void* src, size_t srcSize);
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60
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61 /**
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62 HUF_decompress() :
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63 Decompress HUF data from buffer 'cSrc', of size 'cSrcSize',
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64 into already allocated buffer 'dst', of minimum size 'dstSize'.
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65 `originalSize` : **must** be the ***exact*** size of original (uncompressed) data.
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66 Note : in contrast with FSE, HUF_decompress can regenerate
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67 RLE (cSrcSize==1) and uncompressed (cSrcSize==dstSize) data,
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68 because it knows size to regenerate.
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69 @return : size of regenerated data (== originalSize),
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70 or an error code, which can be tested using HUF_isError()
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71 */
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72 size_t HUF_decompress(void* dst, size_t originalSize,
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73 const void* cSrc, size_t cSrcSize);
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74
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75
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76 /* *** Tool functions *** */
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77 #define HUF_BLOCKSIZE_MAX (128 * 1024) /**< maximum input size for a single block compressed with HUF_compress */
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78 size_t HUF_compressBound(size_t size); /**< maximum compressed size (worst case) */
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79
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80 /* Error Management */
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81 unsigned HUF_isError(size_t code); /**< tells if a return value is an error code */
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82 const char* HUF_getErrorName(size_t code); /**< provides error code string (useful for debugging) */
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83
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84
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85 /* *** Advanced function *** */
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86
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87 /** HUF_compress2() :
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88 * Same as HUF_compress(), but offers direct control over `maxSymbolValue` and `tableLog` .
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89 * `tableLog` must be `<= HUF_TABLELOG_MAX` . */
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90 size_t HUF_compress2 (void* dst, size_t dstSize, const void* src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog);
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91
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92 /** HUF_compress4X_wksp() :
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93 * Same as HUF_compress2(), but uses externally allocated `workSpace`, which must be a table of >= 1024 unsigned */
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94 size_t HUF_compress4X_wksp (void* dst, size_t dstSize, const void* src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog, void* workSpace, size_t wkspSize); /**< `workSpace` must be a table of at least 1024 unsigned */
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95
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96
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97
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98 #ifdef HUF_STATIC_LINKING_ONLY
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99
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100 /* *** Dependencies *** */
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101 #include "mem.h" /* U32 */
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102
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103
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104 /* *** Constants *** */
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105 #define HUF_TABLELOG_ABSOLUTEMAX 15 /* absolute limit of HUF_MAX_TABLELOG. Beyond that value, code does not work */
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106 #define HUF_TABLELOG_MAX 12 /* max configured tableLog (for static allocation); can be modified up to HUF_ABSOLUTEMAX_TABLELOG */
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107 #define HUF_TABLELOG_DEFAULT 11 /* tableLog by default, when not specified */
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108 #define HUF_SYMBOLVALUE_MAX 255
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109 #if (HUF_TABLELOG_MAX > HUF_TABLELOG_ABSOLUTEMAX)
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110 # error "HUF_TABLELOG_MAX is too large !"
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111 #endif
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112
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113
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114 /* ****************************************
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115 * Static allocation
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116 ******************************************/
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117 /* HUF buffer bounds */
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118 #define HUF_CTABLEBOUND 129
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119 #define HUF_BLOCKBOUND(size) (size + (size>>8) + 8) /* only true if incompressible pre-filtered with fast heuristic */
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120 #define HUF_COMPRESSBOUND(size) (HUF_CTABLEBOUND + HUF_BLOCKBOUND(size)) /* Macro version, useful for static allocation */
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121
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122 /* static allocation of HUF's Compression Table */
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123 #define HUF_CREATE_STATIC_CTABLE(name, maxSymbolValue) \
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124 U32 name##hb[maxSymbolValue+1]; \
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125 void* name##hv = &(name##hb); \
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126 HUF_CElt* name = (HUF_CElt*)(name##hv) /* no final ; */
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127
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128 /* static allocation of HUF's DTable */
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129 typedef U32 HUF_DTable;
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130 #define HUF_DTABLE_SIZE(maxTableLog) (1 + (1<<(maxTableLog)))
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131 #define HUF_CREATE_STATIC_DTABLEX2(DTable, maxTableLog) \
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132 HUF_DTable DTable[HUF_DTABLE_SIZE((maxTableLog)-1)] = { ((U32)((maxTableLog)-1) * 0x01000001) }
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133 #define HUF_CREATE_STATIC_DTABLEX4(DTable, maxTableLog) \
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134 HUF_DTable DTable[HUF_DTABLE_SIZE(maxTableLog)] = { ((U32)(maxTableLog) * 0x01000001) }
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135
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136
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137 /* ****************************************
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138 * Advanced decompression functions
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139 ******************************************/
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140 size_t HUF_decompress4X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< single-symbol decoder */
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141 size_t HUF_decompress4X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< double-symbols decoder */
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142
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143 size_t HUF_decompress4X_DCtx (HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< decodes RLE and uncompressed */
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144 size_t HUF_decompress4X_hufOnly(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< considers RLE and uncompressed as errors */
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145 size_t HUF_decompress4X2_DCtx(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< single-symbol decoder */
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146 size_t HUF_decompress4X4_DCtx(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< double-symbols decoder */
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147
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148
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149 /* ****************************************
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150 * HUF detailed API
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151 ******************************************/
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152 /*!
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153 HUF_compress() does the following:
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154 1. count symbol occurrence from source[] into table count[] using FSE_count()
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155 2. (optional) refine tableLog using HUF_optimalTableLog()
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156 3. build Huffman table from count using HUF_buildCTable()
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157 4. save Huffman table to memory buffer using HUF_writeCTable()
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158 5. encode the data stream using HUF_compress4X_usingCTable()
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159
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160 The following API allows targeting specific sub-functions for advanced tasks.
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161 For example, it's possible to compress several blocks using the same 'CTable',
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162 or to save and regenerate 'CTable' using external methods.
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163 */
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164 /* FSE_count() : find it within "fse.h" */
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165 unsigned HUF_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue);
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166 typedef struct HUF_CElt_s HUF_CElt; /* incomplete type */
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167 size_t HUF_buildCTable (HUF_CElt* CTable, const unsigned* count, unsigned maxSymbolValue, unsigned maxNbBits);
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168 size_t HUF_writeCTable (void* dst, size_t maxDstSize, const HUF_CElt* CTable, unsigned maxSymbolValue, unsigned huffLog);
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169 size_t HUF_compress4X_usingCTable(void* dst, size_t dstSize, const void* src, size_t srcSize, const HUF_CElt* CTable);
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170
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171
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172 /** HUF_buildCTable_wksp() :
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173 * Same as HUF_buildCTable(), but using externally allocated scratch buffer.
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174 * `workSpace` must be aligned on 4-bytes boundaries, and be at least as large as a table of 1024 unsigned.
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175 */
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176 size_t HUF_buildCTable_wksp (HUF_CElt* tree, const U32* count, U32 maxSymbolValue, U32 maxNbBits, void* workSpace, size_t wkspSize);
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177
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178 /*! HUF_readStats() :
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179 Read compact Huffman tree, saved by HUF_writeCTable().
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180 `huffWeight` is destination buffer.
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181 @return : size read from `src` , or an error Code .
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182 Note : Needed by HUF_readCTable() and HUF_readDTableXn() . */
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183 size_t HUF_readStats(BYTE* huffWeight, size_t hwSize, U32* rankStats,
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184 U32* nbSymbolsPtr, U32* tableLogPtr,
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185 const void* src, size_t srcSize);
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186
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187 /** HUF_readCTable() :
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188 * Loading a CTable saved with HUF_writeCTable() */
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189 size_t HUF_readCTable (HUF_CElt* CTable, unsigned maxSymbolValue, const void* src, size_t srcSize);
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190
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191
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192 /*
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193 HUF_decompress() does the following:
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194 1. select the decompression algorithm (X2, X4) based on pre-computed heuristics
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195 2. build Huffman table from save, using HUF_readDTableXn()
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196 3. decode 1 or 4 segments in parallel using HUF_decompressSXn_usingDTable
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197 */
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198
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199 /** HUF_selectDecoder() :
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200 * Tells which decoder is likely to decode faster,
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201 * based on a set of pre-determined metrics.
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202 * @return : 0==HUF_decompress4X2, 1==HUF_decompress4X4 .
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203 * Assumption : 0 < cSrcSize < dstSize <= 128 KB */
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204 U32 HUF_selectDecoder (size_t dstSize, size_t cSrcSize);
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205
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206 size_t HUF_readDTableX2 (HUF_DTable* DTable, const void* src, size_t srcSize);
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207 size_t HUF_readDTableX4 (HUF_DTable* DTable, const void* src, size_t srcSize);
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208
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209 size_t HUF_decompress4X_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable);
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210 size_t HUF_decompress4X2_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable);
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211 size_t HUF_decompress4X4_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable);
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212
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213
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214 /* single stream variants */
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215
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216 size_t HUF_compress1X (void* dst, size_t dstSize, const void* src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog);
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217 size_t HUF_compress1X_wksp (void* dst, size_t dstSize, const void* src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog, void* workSpace, size_t wkspSize); /**< `workSpace` must be a table of at least 1024 unsigned */
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218 size_t HUF_compress1X_usingCTable(void* dst, size_t dstSize, const void* src, size_t srcSize, const HUF_CElt* CTable);
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219
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220 size_t HUF_decompress1X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /* single-symbol decoder */
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221 size_t HUF_decompress1X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /* double-symbol decoder */
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222
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223 size_t HUF_decompress1X_DCtx (HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize);
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224 size_t HUF_decompress1X2_DCtx(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< single-symbol decoder */
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225 size_t HUF_decompress1X4_DCtx(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< double-symbols decoder */
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226
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227 size_t HUF_decompress1X_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable); /**< automatic selection of sing or double symbol decoder, based on DTable */
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228 size_t HUF_decompress1X2_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable);
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229 size_t HUF_decompress1X4_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable);
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230
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231 #endif /* HUF_STATIC_LINKING_ONLY */
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232
2e484bdea8c4 zstd: vendor zstd 1.1.1
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233
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
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234 #if defined (__cplusplus)
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
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235 }
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
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236 #endif
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
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237
2e484bdea8c4 zstd: vendor zstd 1.1.1
Gregory Szorc <gregory.szorc@gmail.com>
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238 #endif /* HUF_H_298734234 */