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annotate contrib/python-zstandard/zstd/compress/zstdmt_compress.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 ZSTDMT_COMPRESS_H
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12 #define ZSTDMT_COMPRESS_H
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13
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14 #if defined (__cplusplus)
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15 extern "C" {
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16 #endif
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18
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19 /* Note : This is an internal API.
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20 * Some methods are still exposed (ZSTDLIB_API),
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21 * because it used to be the only way to invoke MT compression.
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22 * Now, it's recommended to use ZSTD_compress_generic() instead.
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23 * These methods will stop being exposed in a future version */
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24
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25 /* === Dependencies === */
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26 #include <stddef.h> /* size_t */
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27 #define ZSTD_STATIC_LINKING_ONLY /* ZSTD_parameters */
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28 #include "zstd.h" /* ZSTD_inBuffer, ZSTD_outBuffer, ZSTDLIB_API */
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31 /* === Constants === */
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32 #ifndef ZSTDMT_NBWORKERS_MAX
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33 # define ZSTDMT_NBWORKERS_MAX 200
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34 #endif
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35 #ifndef ZSTDMT_JOBSIZE_MIN
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36 # define ZSTDMT_JOBSIZE_MIN (1 MB)
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37 #endif
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38 #define ZSTDMT_JOBSIZE_MAX (MEM_32bits() ? (512 MB) : (1024 MB))
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41 /* === Memory management === */
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42 typedef struct ZSTDMT_CCtx_s ZSTDMT_CCtx;
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43 ZSTDLIB_API ZSTDMT_CCtx* ZSTDMT_createCCtx(unsigned nbWorkers);
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44 ZSTDLIB_API ZSTDMT_CCtx* ZSTDMT_createCCtx_advanced(unsigned nbWorkers,
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45 ZSTD_customMem cMem);
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46 ZSTDLIB_API size_t ZSTDMT_freeCCtx(ZSTDMT_CCtx* mtctx);
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47
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48 ZSTDLIB_API size_t ZSTDMT_sizeof_CCtx(ZSTDMT_CCtx* mtctx);
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51 /* === Simple one-pass compression function === */
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52
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53 ZSTDLIB_API size_t ZSTDMT_compressCCtx(ZSTDMT_CCtx* mtctx,
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54 void* dst, size_t dstCapacity,
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55 const void* src, size_t srcSize,
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56 int compressionLevel);
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57
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60 /* === Streaming functions === */
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61
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62 ZSTDLIB_API size_t ZSTDMT_initCStream(ZSTDMT_CCtx* mtctx, int compressionLevel);
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63 ZSTDLIB_API size_t ZSTDMT_resetCStream(ZSTDMT_CCtx* mtctx, unsigned long long pledgedSrcSize); /**< if srcSize is not known at reset time, use ZSTD_CONTENTSIZE_UNKNOWN. Note: for compatibility with older programs, 0 means the same as ZSTD_CONTENTSIZE_UNKNOWN, but it will change in the future to mean "empty" */
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64
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65 ZSTDLIB_API size_t ZSTDMT_nextInputSizeHint(const ZSTDMT_CCtx* mtctx);
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66 ZSTDLIB_API size_t ZSTDMT_compressStream(ZSTDMT_CCtx* mtctx, ZSTD_outBuffer* output, ZSTD_inBuffer* input);
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67
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68 ZSTDLIB_API size_t ZSTDMT_flushStream(ZSTDMT_CCtx* mtctx, ZSTD_outBuffer* output); /**< @return : 0 == all flushed; >0 : still some data to be flushed; or an error code (ZSTD_isError()) */
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69 ZSTDLIB_API size_t ZSTDMT_endStream(ZSTDMT_CCtx* mtctx, ZSTD_outBuffer* output); /**< @return : 0 == all flushed; >0 : still some data to be flushed; or an error code (ZSTD_isError()) */
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72 /* === Advanced functions and parameters === */
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73
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74 ZSTDLIB_API size_t ZSTDMT_compress_advanced(ZSTDMT_CCtx* mtctx,
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75 void* dst, size_t dstCapacity,
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76 const void* src, size_t srcSize,
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77 const ZSTD_CDict* cdict,
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78 ZSTD_parameters params,
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79 int overlapLog);
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80
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81 ZSTDLIB_API size_t ZSTDMT_initCStream_advanced(ZSTDMT_CCtx* mtctx,
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82 const void* dict, size_t dictSize, /* dict can be released after init, a local copy is preserved within zcs */
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83 ZSTD_parameters params,
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84 unsigned long long pledgedSrcSize); /* pledgedSrcSize is optional and can be zero == unknown */
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85
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86 ZSTDLIB_API size_t ZSTDMT_initCStream_usingCDict(ZSTDMT_CCtx* mtctx,
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87 const ZSTD_CDict* cdict,
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88 ZSTD_frameParameters fparams,
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89 unsigned long long pledgedSrcSize); /* note : zero means empty */
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90
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91 /* ZSTDMT_parameter :
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92 * List of parameters that can be set using ZSTDMT_setMTCtxParameter() */
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93 typedef enum {
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94 ZSTDMT_p_jobSize, /* Each job is compressed in parallel. By default, this value is dynamically determined depending on compression parameters. Can be set explicitly here. */
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95 ZSTDMT_p_overlapLog, /* Each job may reload a part of previous job to enhance compressionr ratio; 0 == no overlap, 6(default) == use 1/8th of window, >=9 == use full window. This is a "sticky" parameter : its value will be re-used on next compression job */
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96 ZSTDMT_p_rsyncable /* Enables rsyncable mode. */
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97 } ZSTDMT_parameter;
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98
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99 /* ZSTDMT_setMTCtxParameter() :
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100 * allow setting individual parameters, one at a time, among a list of enums defined in ZSTDMT_parameter.
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101 * The function must be called typically after ZSTD_createCCtx() but __before ZSTDMT_init*() !__
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102 * Parameters not explicitly reset by ZSTDMT_init*() remain the same in consecutive compression sessions.
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103 * @return : 0, or an error code (which can be tested using ZSTD_isError()) */
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104 ZSTDLIB_API size_t ZSTDMT_setMTCtxParameter(ZSTDMT_CCtx* mtctx, ZSTDMT_parameter parameter, int value);
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105
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106 /* ZSTDMT_getMTCtxParameter() :
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107 * Query the ZSTDMT_CCtx for a parameter value.
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108 * @return : 0, or an error code (which can be tested using ZSTD_isError()) */
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109 ZSTDLIB_API size_t ZSTDMT_getMTCtxParameter(ZSTDMT_CCtx* mtctx, ZSTDMT_parameter parameter, int* value);
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110
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111
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112 /*! ZSTDMT_compressStream_generic() :
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113 * Combines ZSTDMT_compressStream() with optional ZSTDMT_flushStream() or ZSTDMT_endStream()
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114 * depending on flush directive.
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115 * @return : minimum amount of data still to be flushed
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116 * 0 if fully flushed
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117 * or an error code
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118 * note : needs to be init using any ZSTD_initCStream*() variant */
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119 ZSTDLIB_API size_t ZSTDMT_compressStream_generic(ZSTDMT_CCtx* mtctx,
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120 ZSTD_outBuffer* output,
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121 ZSTD_inBuffer* input,
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122 ZSTD_EndDirective endOp);
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123
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124
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125 /* ========================================================
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126 * === Private interface, for use by ZSTD_compress.c ===
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127 * === Not exposed in libzstd. Never invoke directly ===
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128 * ======================================================== */
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129
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130 /*! ZSTDMT_toFlushNow()
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131 * Tell how many bytes are ready to be flushed immediately.
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132 * Probe the oldest active job (not yet entirely flushed) and check its output buffer.
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133 * If return 0, it means there is no active job,
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134 * or, it means oldest job is still active, but everything produced has been flushed so far,
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135 * therefore flushing is limited by speed of oldest job. */
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136 size_t ZSTDMT_toFlushNow(ZSTDMT_CCtx* mtctx);
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137
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138 /*! ZSTDMT_CCtxParam_setMTCtxParameter()
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139 * like ZSTDMT_setMTCtxParameter(), but into a ZSTD_CCtx_Params */
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140 size_t ZSTDMT_CCtxParam_setMTCtxParameter(ZSTD_CCtx_params* params, ZSTDMT_parameter parameter, int value);
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141
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142 /*! ZSTDMT_CCtxParam_setNbWorkers()
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143 * Set nbWorkers, and clamp it.
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144 * Also reset jobSize and overlapLog */
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145 size_t ZSTDMT_CCtxParam_setNbWorkers(ZSTD_CCtx_params* params, unsigned nbWorkers);
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146
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147 /*! ZSTDMT_updateCParams_whileCompressing() :
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148 * Updates only a selected set of compression parameters, to remain compatible with current frame.
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149 * New parameters will be applied to next compression job. */
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150 void ZSTDMT_updateCParams_whileCompressing(ZSTDMT_CCtx* mtctx, const ZSTD_CCtx_params* cctxParams);
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151
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152 /*! ZSTDMT_getFrameProgression():
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153 * tells how much data has been consumed (input) and produced (output) for current frame.
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154 * able to count progression inside worker threads.
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155 */
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156 ZSTD_frameProgression ZSTDMT_getFrameProgression(ZSTDMT_CCtx* mtctx);
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157
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158
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159 /*! ZSTDMT_initCStream_internal() :
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160 * Private use only. Init streaming operation.
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161 * expects params to be valid.
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162 * must receive dict, or cdict, or none, but not both.
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163 * @return : 0, or an error code */
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164 size_t ZSTDMT_initCStream_internal(ZSTDMT_CCtx* zcs,
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165 const void* dict, size_t dictSize, ZSTD_dictContentType_e dictContentType,
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166 const ZSTD_CDict* cdict,
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167 ZSTD_CCtx_params params, unsigned long long pledgedSrcSize);
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168
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169
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170 #if defined (__cplusplus)
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171 }
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172 #endif
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173
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174 #endif /* ZSTDMT_COMPRESS_H */