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annotate contrib/python-zstandard/zstd/common/huf.h @ 30822:b54a2984cdd4

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zstd: vendor python-zstandard 0.6.0 Commit 63c68d6f5fc8de4afd9bde81b13b537beb4e47e8 from https://github.com/indygreg/python-zstandard is imported without modifications (other than removing unwanted files). This includes minor performance and feature improvements. It also changes the vendored zstd library from 1.1.1 to 1.1.2. # no-check-commit
author Gregory Szorc <gregory.szorc@gmail.com>
date Sat, 14 Jan 2017 19:41:43 -0800
parents 2e484bdea8c4
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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11
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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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40
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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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45
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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
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233
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234 #if defined (__cplusplus)
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235 }
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236 #endif
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237
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238 #endif /* HUF_H_298734234 */