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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
parents b54a2984cdd4
children 73fef626dae3
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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
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35 #if defined (__cplusplus)
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36 extern "C" {
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37 #endif
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38
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39 #ifndef HUF_H_298734234
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40 #define HUF_H_298734234
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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 /* *** library symbols visibility *** */
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47 /* Note : when linking with -fvisibility=hidden on gcc, or by default on Visual,
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48 * HUF symbols remain "private" (internal symbols for library only).
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49 * Set macro FSE_DLL_EXPORT to 1 if you want HUF symbols visible on DLL interface */
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50 #if defined(FSE_DLL_EXPORT) && (FSE_DLL_EXPORT==1) && defined(__GNUC__) && (__GNUC__ >= 4)
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51 # define HUF_PUBLIC_API __attribute__ ((visibility ("default")))
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52 #elif defined(FSE_DLL_EXPORT) && (FSE_DLL_EXPORT==1) /* Visual expected */
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53 # define HUF_PUBLIC_API __declspec(dllexport)
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54 #elif defined(FSE_DLL_IMPORT) && (FSE_DLL_IMPORT==1)
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55 # define HUF_PUBLIC_API __declspec(dllimport) /* not required, just to generate faster code (saves a function pointer load from IAT and an indirect jump) */
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56 #else
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57 # define HUF_PUBLIC_API
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58 #endif
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59
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60
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61 /* ========================== */
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62 /* *** simple functions *** */
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63 /* ========================== */
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64
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65 /** HUF_compress() :
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66 * Compress content from buffer 'src', of size 'srcSize', into buffer 'dst'.
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67 * 'dst' buffer must be already allocated.
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68 * Compression runs faster if `dstCapacity` >= HUF_compressBound(srcSize).
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69 * `srcSize` must be <= `HUF_BLOCKSIZE_MAX` == 128 KB.
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70 * @return : size of compressed data (<= `dstCapacity`).
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71 * Special values : if return == 0, srcData is not compressible => Nothing is stored within dst !!!
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72 * if HUF_isError(return), compression failed (more details using HUF_getErrorName())
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73 */
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74 HUF_PUBLIC_API size_t HUF_compress(void* dst, size_t dstCapacity,
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75 const void* src, size_t srcSize);
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76
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77 /** HUF_decompress() :
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78 * Decompress HUF data from buffer 'cSrc', of size 'cSrcSize',
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79 * into already allocated buffer 'dst', of minimum size 'dstSize'.
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80 * `originalSize` : **must** be the ***exact*** size of original (uncompressed) data.
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81 * Note : in contrast with FSE, HUF_decompress can regenerate
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82 * RLE (cSrcSize==1) and uncompressed (cSrcSize==dstSize) data,
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83 * because it knows size to regenerate (originalSize).
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84 * @return : size of regenerated data (== originalSize),
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85 * or an error code, which can be tested using HUF_isError()
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86 */
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87 HUF_PUBLIC_API size_t HUF_decompress(void* dst, size_t originalSize,
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88 const void* cSrc, size_t cSrcSize);
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90
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91 /* *** Tool functions *** */
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92 #define HUF_BLOCKSIZE_MAX (128 * 1024) /**< maximum input size for a single block compressed with HUF_compress */
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93 HUF_PUBLIC_API size_t HUF_compressBound(size_t size); /**< maximum compressed size (worst case) */
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94
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95 /* Error Management */
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96 HUF_PUBLIC_API unsigned HUF_isError(size_t code); /**< tells if a return value is an error code */
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97 HUF_PUBLIC_API const char* HUF_getErrorName(size_t code); /**< provides error code string (useful for debugging) */
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98
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99
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100 /* *** Advanced function *** */
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101
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102 /** HUF_compress2() :
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103 * Same as HUF_compress(), but offers control over `maxSymbolValue` and `tableLog`.
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104 * `maxSymbolValue` must be <= HUF_SYMBOLVALUE_MAX .
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105 * `tableLog` must be `<= HUF_TABLELOG_MAX` . */
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106 HUF_PUBLIC_API size_t HUF_compress2 (void* dst, size_t dstCapacity,
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107 const void* src, size_t srcSize,
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108 unsigned maxSymbolValue, unsigned tableLog);
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109
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110 /** HUF_compress4X_wksp() :
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111 * Same as HUF_compress2(), but uses externally allocated `workSpace`.
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112 * `workspace` must have minimum alignment of 4, and be at least as large as HUF_WORKSPACE_SIZE */
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113 #define HUF_WORKSPACE_SIZE (6 << 10)
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114 #define HUF_WORKSPACE_SIZE_U32 (HUF_WORKSPACE_SIZE / sizeof(U32))
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115 HUF_PUBLIC_API size_t HUF_compress4X_wksp (void* dst, size_t dstCapacity,
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116 const void* src, size_t srcSize,
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117 unsigned maxSymbolValue, unsigned tableLog,
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118 void* workSpace, size_t wkspSize);
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119
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120 #endif /* HUF_H_298734234 */
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121
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122 /* ******************************************************************
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123 * WARNING !!
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124 * The following section contains advanced and experimental definitions
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125 * which shall never be used in the context of a dynamic library,
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126 * because they are not guaranteed to remain stable in the future.
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127 * Only consider them in association with static linking.
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128 * *****************************************************************/
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129 #if defined(HUF_STATIC_LINKING_ONLY) && !defined(HUF_H_HUF_STATIC_LINKING_ONLY)
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130 #define HUF_H_HUF_STATIC_LINKING_ONLY
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131
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132 /* *** Dependencies *** */
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133 #include "mem.h" /* U32 */
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134
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135
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136 /* *** Constants *** */
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137 #define HUF_TABLELOG_MAX 12 /* max runtime value of tableLog (due to static allocation); can be modified up to HUF_ABSOLUTEMAX_TABLELOG */
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138 #define HUF_TABLELOG_DEFAULT 11 /* default tableLog value when none specified */
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139 #define HUF_SYMBOLVALUE_MAX 255
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140
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141 #define HUF_TABLELOG_ABSOLUTEMAX 15 /* absolute limit of HUF_MAX_TABLELOG. Beyond that value, code does not work */
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142 #if (HUF_TABLELOG_MAX > HUF_TABLELOG_ABSOLUTEMAX)
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143 # error "HUF_TABLELOG_MAX is too large !"
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144 #endif
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145
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146
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147 /* ****************************************
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148 * Static allocation
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149 ******************************************/
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150 /* HUF buffer bounds */
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151 #define HUF_CTABLEBOUND 129
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152 #define HUF_BLOCKBOUND(size) (size + (size>>8) + 8) /* only true when incompressible is pre-filtered with fast heuristic */
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153 #define HUF_COMPRESSBOUND(size) (HUF_CTABLEBOUND + HUF_BLOCKBOUND(size)) /* Macro version, useful for static allocation */
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154
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155 /* static allocation of HUF's Compression Table */
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156 #define HUF_CTABLE_SIZE_U32(maxSymbolValue) ((maxSymbolValue)+1) /* Use tables of U32, for proper alignment */
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157 #define HUF_CTABLE_SIZE(maxSymbolValue) (HUF_CTABLE_SIZE_U32(maxSymbolValue) * sizeof(U32))
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158 #define HUF_CREATE_STATIC_CTABLE(name, maxSymbolValue) \
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159 U32 name##hb[HUF_CTABLE_SIZE_U32(maxSymbolValue)]; \
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160 void* name##hv = &(name##hb); \
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161 HUF_CElt* name = (HUF_CElt*)(name##hv) /* no final ; */
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162
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163 /* static allocation of HUF's DTable */
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164 typedef U32 HUF_DTable;
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165 #define HUF_DTABLE_SIZE(maxTableLog) (1 + (1<<(maxTableLog)))
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166 #define HUF_CREATE_STATIC_DTABLEX2(DTable, maxTableLog) \
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167 HUF_DTable DTable[HUF_DTABLE_SIZE((maxTableLog)-1)] = { ((U32)((maxTableLog)-1) * 0x01000001) }
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168 #define HUF_CREATE_STATIC_DTABLEX4(DTable, maxTableLog) \
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169 HUF_DTable DTable[HUF_DTABLE_SIZE(maxTableLog)] = { ((U32)(maxTableLog) * 0x01000001) }
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170
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171
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172 /* ****************************************
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173 * Advanced decompression functions
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174 ******************************************/
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175 size_t HUF_decompress4X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< single-symbol decoder */
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176 size_t HUF_decompress4X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /**< double-symbols decoder */
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177
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178 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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179 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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180 size_t HUF_decompress4X_hufOnly_wksp(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize, void* workSpace, size_t wkspSize); /**< considers RLE and uncompressed as errors */
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181 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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182 size_t HUF_decompress4X2_DCtx_wksp(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize, void* workSpace, size_t wkspSize); /**< single-symbol decoder */
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183 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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184 size_t HUF_decompress4X4_DCtx_wksp(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize, void* workSpace, size_t wkspSize); /**< double-symbols decoder */
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185
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186
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187 /* ****************************************
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188 * HUF detailed API
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189 * ****************************************/
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190
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191 /*! HUF_compress() does the following:
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192 * 1. count symbol occurrence from source[] into table count[] using FSE_count() (exposed within "fse.h")
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193 * 2. (optional) refine tableLog using HUF_optimalTableLog()
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194 * 3. build Huffman table from count using HUF_buildCTable()
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195 * 4. save Huffman table to memory buffer using HUF_writeCTable()
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196 * 5. encode the data stream using HUF_compress4X_usingCTable()
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197 *
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198 * The following API allows targeting specific sub-functions for advanced tasks.
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199 * For example, it's possible to compress several blocks using the same 'CTable',
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200 * or to save and regenerate 'CTable' using external methods.
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201 */
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202 unsigned HUF_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue);
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203 typedef struct HUF_CElt_s HUF_CElt; /* incomplete type */
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204 size_t HUF_buildCTable (HUF_CElt* CTable, const unsigned* count, unsigned maxSymbolValue, unsigned maxNbBits); /* @return : maxNbBits; CTable and count can overlap. In which case, CTable will overwrite count content */
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205 size_t HUF_writeCTable (void* dst, size_t maxDstSize, const HUF_CElt* CTable, unsigned maxSymbolValue, unsigned huffLog);
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206 size_t HUF_compress4X_usingCTable(void* dst, size_t dstSize, const void* src, size_t srcSize, const HUF_CElt* CTable);
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207
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208 typedef enum {
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209 HUF_repeat_none, /**< Cannot use the previous table */
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210 HUF_repeat_check, /**< Can use the previous table but it must be checked. Note : The previous table must have been constructed by HUF_compress{1, 4}X_repeat */
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211 HUF_repeat_valid /**< Can use the previous table and it is asumed to be valid */
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212 } HUF_repeat;
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213 /** HUF_compress4X_repeat() :
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214 * Same as HUF_compress4X_wksp(), but considers using hufTable if *repeat != HUF_repeat_none.
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215 * If it uses hufTable it does not modify hufTable or repeat.
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216 * If it doesn't, it sets *repeat = HUF_repeat_none, and it sets hufTable to the table used.
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217 * If preferRepeat then the old table will always be used if valid. */
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218 size_t HUF_compress4X_repeat(void* dst, size_t dstSize,
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219 const void* src, size_t srcSize,
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220 unsigned maxSymbolValue, unsigned tableLog,
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221 void* workSpace, size_t wkspSize, /**< `workSpace` must be aligned on 4-bytes boundaries, `wkspSize` must be >= HUF_WORKSPACE_SIZE */
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222 HUF_CElt* hufTable, HUF_repeat* repeat, int preferRepeat, int bmi2);
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223
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224 /** HUF_buildCTable_wksp() :
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225 * Same as HUF_buildCTable(), but using externally allocated scratch buffer.
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226 * `workSpace` must be aligned on 4-bytes boundaries, and its size must be >= HUF_CTABLE_WORKSPACE_SIZE.
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227 */
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228 #define HUF_CTABLE_WORKSPACE_SIZE_U32 (2*HUF_SYMBOLVALUE_MAX +1 +1)
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229 #define HUF_CTABLE_WORKSPACE_SIZE (HUF_CTABLE_WORKSPACE_SIZE_U32 * sizeof(unsigned))
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230 size_t HUF_buildCTable_wksp (HUF_CElt* tree, const U32* count, U32 maxSymbolValue, U32 maxNbBits, void* workSpace, size_t wkspSize);
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231
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232 /*! HUF_readStats() :
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233 * Read compact Huffman tree, saved by HUF_writeCTable().
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234 * `huffWeight` is destination buffer.
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235 * @return : size read from `src` , or an error Code .
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236 * Note : Needed by HUF_readCTable() and HUF_readDTableXn() . */
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237 size_t HUF_readStats(BYTE* huffWeight, size_t hwSize,
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238 U32* rankStats, U32* nbSymbolsPtr, U32* tableLogPtr,
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239 const void* src, size_t srcSize);
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240
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241 /** HUF_readCTable() :
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242 * Loading a CTable saved with HUF_writeCTable() */
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243 size_t HUF_readCTable (HUF_CElt* CTable, unsigned* maxSymbolValuePtr, const void* src, size_t srcSize);
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244
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245
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246 /*
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247 * HUF_decompress() does the following:
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248 * 1. select the decompression algorithm (X2, X4) based on pre-computed heuristics
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249 * 2. build Huffman table from save, using HUF_readDTableX?()
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250 * 3. decode 1 or 4 segments in parallel using HUF_decompress?X?_usingDTable()
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251 */
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252
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253 /** HUF_selectDecoder() :
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254 * Tells which decoder is likely to decode faster,
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255 * based on a set of pre-computed metrics.
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256 * @return : 0==HUF_decompress4X2, 1==HUF_decompress4X4 .
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257 * Assumption : 0 < dstSize <= 128 KB */
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258 U32 HUF_selectDecoder (size_t dstSize, size_t cSrcSize);
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259
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260 /**
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261 * The minimum workspace size for the `workSpace` used in
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262 * HUF_readDTableX2_wksp() and HUF_readDTableX4_wksp().
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263 *
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264 * The space used depends on HUF_TABLELOG_MAX, ranging from ~1500 bytes when
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265 * HUF_TABLE_LOG_MAX=12 to ~1850 bytes when HUF_TABLE_LOG_MAX=15.
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266 * Buffer overflow errors may potentially occur if code modifications result in
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267 * a required workspace size greater than that specified in the following
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268 * macro.
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269 */
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270 #define HUF_DECOMPRESS_WORKSPACE_SIZE (2 << 10)
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271 #define HUF_DECOMPRESS_WORKSPACE_SIZE_U32 (HUF_DECOMPRESS_WORKSPACE_SIZE / sizeof(U32))
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272
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273 size_t HUF_readDTableX2 (HUF_DTable* DTable, const void* src, size_t srcSize);
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274 size_t HUF_readDTableX2_wksp (HUF_DTable* DTable, const void* src, size_t srcSize, void* workSpace, size_t wkspSize);
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275 size_t HUF_readDTableX4 (HUF_DTable* DTable, const void* src, size_t srcSize);
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276 size_t HUF_readDTableX4_wksp (HUF_DTable* DTable, const void* src, size_t srcSize, void* workSpace, size_t wkspSize);
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277
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278 size_t HUF_decompress4X_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable);
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279 size_t HUF_decompress4X2_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable);
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280 size_t HUF_decompress4X4_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable);
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281
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282
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283 /* ====================== */
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284 /* single stream variants */
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285 /* ====================== */
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286
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287 size_t HUF_compress1X (void* dst, size_t dstSize, const void* src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog);
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288 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 HUF_WORKSPACE_SIZE_U32 unsigned */
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289 size_t HUF_compress1X_usingCTable(void* dst, size_t dstSize, const void* src, size_t srcSize, const HUF_CElt* CTable);
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290 /** HUF_compress1X_repeat() :
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291 * Same as HUF_compress1X_wksp(), but considers using hufTable if *repeat != HUF_repeat_none.
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292 * If it uses hufTable it does not modify hufTable or repeat.
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293 * If it doesn't, it sets *repeat = HUF_repeat_none, and it sets hufTable to the table used.
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294 * If preferRepeat then the old table will always be used if valid. */
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295 size_t HUF_compress1X_repeat(void* dst, size_t dstSize,
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296 const void* src, size_t srcSize,
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297 unsigned maxSymbolValue, unsigned tableLog,
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298 void* workSpace, size_t wkspSize, /**< `workSpace` must be aligned on 4-bytes boundaries, `wkspSize` must be >= HUF_WORKSPACE_SIZE */
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299 HUF_CElt* hufTable, HUF_repeat* repeat, int preferRepeat, int bmi2);
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300
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301 size_t HUF_decompress1X2 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /* single-symbol decoder */
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302 size_t HUF_decompress1X4 (void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize); /* double-symbol decoder */
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303
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304 size_t HUF_decompress1X_DCtx (HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize);
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305 size_t HUF_decompress1X_DCtx_wksp (HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize, void* workSpace, size_t wkspSize);
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306 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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307 size_t HUF_decompress1X2_DCtx_wksp(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize, void* workSpace, size_t wkspSize); /**< single-symbol decoder */
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308 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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309 size_t HUF_decompress1X4_DCtx_wksp(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize, void* workSpace, size_t wkspSize); /**< double-symbols decoder */
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310
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311 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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312 size_t HUF_decompress1X2_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable);
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313 size_t HUF_decompress1X4_usingDTable(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable);
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314
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315 /* BMI2 variants.
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316 * If the CPU has BMI2 support, pass bmi2=1, otherwise pass bmi2=0.
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317 */
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318 size_t HUF_decompress1X_usingDTable_bmi2(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable, int bmi2);
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319 size_t HUF_decompress1X2_DCtx_wksp_bmi2(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize, void* workSpace, size_t wkspSize, int bmi2);
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320 size_t HUF_decompress4X_usingDTable_bmi2(void* dst, size_t maxDstSize, const void* cSrc, size_t cSrcSize, const HUF_DTable* DTable, int bmi2);
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321 size_t HUF_decompress4X_hufOnly_wksp_bmi2(HUF_DTable* dctx, void* dst, size_t dstSize, const void* cSrc, size_t cSrcSize, void* workSpace, size_t wkspSize, int bmi2);
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322
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323 #endif /* HUF_STATIC_LINKING_ONLY */
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324
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325 #if defined (__cplusplus)
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326 }
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327 #endif