2 * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
5 * This source code is licensed under both the BSD-style license (found in the
6 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
7 * in the COPYING file in the root directory of this source tree).
8 * You may select, at your option, one of the above-listed licenses.
11 #ifndef ZSTDMT_COMPRESS_H
12 #define ZSTDMT_COMPRESS_H
14 #if defined (__cplusplus)
19 /* Note : This is an internal API.
20 * Some methods are still exposed (ZSTDLIB_API),
21 * because it used to be the only way to invoke MT compression.
22 * Now, it's recommended to use ZSTD_compress_generic() instead.
23 * These methods will stop being exposed in a future version */
25 /* === Dependencies === */
26 #include <stddef.h> /* size_t */
27 #define ZSTD_STATIC_LINKING_ONLY /* ZSTD_parameters */
28 #include "zstd.h" /* ZSTD_inBuffer, ZSTD_outBuffer, ZSTDLIB_API */
31 /* === Memory management === */
32 typedef struct ZSTDMT_CCtx_s ZSTDMT_CCtx;
33 ZSTDLIB_API ZSTDMT_CCtx* ZSTDMT_createCCtx(unsigned nbWorkers);
34 ZSTDLIB_API ZSTDMT_CCtx* ZSTDMT_createCCtx_advanced(unsigned nbWorkers,
36 ZSTDLIB_API size_t ZSTDMT_freeCCtx(ZSTDMT_CCtx* mtctx);
38 ZSTDLIB_API size_t ZSTDMT_sizeof_CCtx(ZSTDMT_CCtx* mtctx);
41 /* === Simple one-pass compression function === */
43 ZSTDLIB_API size_t ZSTDMT_compressCCtx(ZSTDMT_CCtx* mtctx,
44 void* dst, size_t dstCapacity,
45 const void* src, size_t srcSize,
46 int compressionLevel);
50 /* === Streaming functions === */
52 ZSTDLIB_API size_t ZSTDMT_initCStream(ZSTDMT_CCtx* mtctx, int compressionLevel);
53 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" */
55 ZSTDLIB_API size_t ZSTDMT_compressStream(ZSTDMT_CCtx* mtctx, ZSTD_outBuffer* output, ZSTD_inBuffer* input);
57 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()) */
58 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()) */
61 /* === Advanced functions and parameters === */
63 #ifndef ZSTDMT_JOBSIZE_MIN
64 # define ZSTDMT_JOBSIZE_MIN (1U << 20) /* 1 MB - Minimum size of each compression job */
67 ZSTDLIB_API size_t ZSTDMT_compress_advanced(ZSTDMT_CCtx* mtctx,
68 void* dst, size_t dstCapacity,
69 const void* src, size_t srcSize,
70 const ZSTD_CDict* cdict,
71 ZSTD_parameters params,
74 ZSTDLIB_API size_t ZSTDMT_initCStream_advanced(ZSTDMT_CCtx* mtctx,
75 const void* dict, size_t dictSize, /* dict can be released after init, a local copy is preserved within zcs */
76 ZSTD_parameters params,
77 unsigned long long pledgedSrcSize); /* pledgedSrcSize is optional and can be zero == unknown */
79 ZSTDLIB_API size_t ZSTDMT_initCStream_usingCDict(ZSTDMT_CCtx* mtctx,
80 const ZSTD_CDict* cdict,
81 ZSTD_frameParameters fparams,
82 unsigned long long pledgedSrcSize); /* note : zero means empty */
85 * List of parameters that can be set using ZSTDMT_setMTCtxParameter() */
87 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. */
88 ZSTDMT_p_overlapSectionLog /* 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 */
91 /* ZSTDMT_setMTCtxParameter() :
92 * allow setting individual parameters, one at a time, among a list of enums defined in ZSTDMT_parameter.
93 * The function must be called typically after ZSTD_createCCtx() but __before ZSTDMT_init*() !__
94 * Parameters not explicitly reset by ZSTDMT_init*() remain the same in consecutive compression sessions.
95 * @return : 0, or an error code (which can be tested using ZSTD_isError()) */
96 ZSTDLIB_API size_t ZSTDMT_setMTCtxParameter(ZSTDMT_CCtx* mtctx, ZSTDMT_parameter parameter, unsigned value);
98 /* ZSTDMT_getMTCtxParameter() :
99 * Query the ZSTDMT_CCtx for a parameter value.
100 * @return : 0, or an error code (which can be tested using ZSTD_isError()) */
101 ZSTDLIB_API size_t ZSTDMT_getMTCtxParameter(ZSTDMT_CCtx* mtctx, ZSTDMT_parameter parameter, unsigned* value);
104 /*! ZSTDMT_compressStream_generic() :
105 * Combines ZSTDMT_compressStream() with optional ZSTDMT_flushStream() or ZSTDMT_endStream()
106 * depending on flush directive.
107 * @return : minimum amount of data still to be flushed
110 * note : needs to be init using any ZSTD_initCStream*() variant */
111 ZSTDLIB_API size_t ZSTDMT_compressStream_generic(ZSTDMT_CCtx* mtctx,
112 ZSTD_outBuffer* output,
113 ZSTD_inBuffer* input,
114 ZSTD_EndDirective endOp);
117 /* ========================================================
118 * === Private interface, for use by ZSTD_compress.c ===
119 * === Not exposed in libzstd. Never invoke directly ===
120 * ======================================================== */
122 /*! ZSTDMT_toFlushNow()
123 * Tell how many bytes are ready to be flushed immediately.
124 * Probe the oldest active job (not yet entirely flushed) and check its output buffer.
125 * If return 0, it means there is no active job,
126 * or, it means oldest job is still active, but everything produced has been flushed so far,
127 * therefore flushing is limited by speed of oldest job. */
128 size_t ZSTDMT_toFlushNow(ZSTDMT_CCtx* mtctx);
130 /*! ZSTDMT_CCtxParam_setMTCtxParameter()
131 * like ZSTDMT_setMTCtxParameter(), but into a ZSTD_CCtx_Params */
132 size_t ZSTDMT_CCtxParam_setMTCtxParameter(ZSTD_CCtx_params* params, ZSTDMT_parameter parameter, unsigned value);
134 /*! ZSTDMT_CCtxParam_setNbWorkers()
135 * Set nbWorkers, and clamp it.
136 * Also reset jobSize and overlapLog */
137 size_t ZSTDMT_CCtxParam_setNbWorkers(ZSTD_CCtx_params* params, unsigned nbWorkers);
139 /*! ZSTDMT_updateCParams_whileCompressing() :
140 * Updates only a selected set of compression parameters, to remain compatible with current frame.
141 * New parameters will be applied to next compression job. */
142 void ZSTDMT_updateCParams_whileCompressing(ZSTDMT_CCtx* mtctx, const ZSTD_CCtx_params* cctxParams);
144 /*! ZSTDMT_getFrameProgression():
145 * tells how much data has been consumed (input) and produced (output) for current frame.
146 * able to count progression inside worker threads.
148 ZSTD_frameProgression ZSTDMT_getFrameProgression(ZSTDMT_CCtx* mtctx);
151 /*! ZSTDMT_initCStream_internal() :
152 * Private use only. Init streaming operation.
153 * expects params to be valid.
154 * must receive dict, or cdict, or none, but not both.
155 * @return : 0, or an error code */
156 size_t ZSTDMT_initCStream_internal(ZSTDMT_CCtx* zcs,
157 const void* dict, size_t dictSize, ZSTD_dictContentType_e dictContentType,
158 const ZSTD_CDict* cdict,
159 ZSTD_CCtx_params params, unsigned long long pledgedSrcSize);
162 #if defined (__cplusplus)
166 #endif /* ZSTDMT_COMPRESS_H */