141 lines
6.5 KiB
C
141 lines
6.5 KiB
C
/*
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* Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under both the BSD-style license (found in the
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* LICENSE file in the root directory of this source tree) and the GPLv2 (found
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* in the COPYING file in the root directory of this source tree).
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* You may select, at your option, one of the above-listed licenses.
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*/
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#ifndef ZSTDMT_COMPRESS_H
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#define ZSTDMT_COMPRESS_H
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#if defined (__cplusplus)
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extern "C" {
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#endif
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/* Note : This is an internal API.
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* Some methods are still exposed (ZSTDLIB_API),
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* because it used to be the only way to invoke MT compression.
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* Now, it's recommended to use ZSTD_compress_generic() instead.
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* These methods will stop being exposed in a future version */
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/* === Dependencies === */
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#include <stddef.h> /* size_t */
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#define ZSTD_STATIC_LINKING_ONLY /* ZSTD_parameters */
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#include "zstd.h" /* ZSTD_inBuffer, ZSTD_outBuffer, ZSTDLIB_API */
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/* === Memory management === */
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typedef struct ZSTDMT_CCtx_s ZSTDMT_CCtx;
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ZSTDLIB_API ZSTDMT_CCtx* ZSTDMT_createCCtx(unsigned nbThreads);
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ZSTDLIB_API ZSTDMT_CCtx* ZSTDMT_createCCtx_advanced(unsigned nbThreads,
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ZSTD_customMem cMem);
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ZSTDLIB_API size_t ZSTDMT_freeCCtx(ZSTDMT_CCtx* mtctx);
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ZSTDLIB_API size_t ZSTDMT_sizeof_CCtx(ZSTDMT_CCtx* mtctx);
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/* === Simple buffer-to-butter one-pass function === */
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ZSTDLIB_API size_t ZSTDMT_compressCCtx(ZSTDMT_CCtx* mtctx,
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void* dst, size_t dstCapacity,
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const void* src, size_t srcSize,
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int compressionLevel);
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/* === Streaming functions === */
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ZSTDLIB_API size_t ZSTDMT_initCStream(ZSTDMT_CCtx* mtctx, int compressionLevel);
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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 may change in the future, to mean "empty" */
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ZSTDLIB_API size_t ZSTDMT_compressStream(ZSTDMT_CCtx* mtctx, ZSTD_outBuffer* output, ZSTD_inBuffer* input);
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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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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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/* === Advanced functions and parameters === */
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#ifndef ZSTDMT_JOBSIZE_MIN
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# define ZSTDMT_JOBSIZE_MIN (1U << 20) /* 1 MB - Minimum size of each compression job */
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#endif
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ZSTDLIB_API size_t ZSTDMT_compress_advanced(ZSTDMT_CCtx* mtctx,
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void* dst, size_t dstCapacity,
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const void* src, size_t srcSize,
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const ZSTD_CDict* cdict,
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ZSTD_parameters const params,
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unsigned overlapLog);
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ZSTDLIB_API size_t ZSTDMT_initCStream_advanced(ZSTDMT_CCtx* mtctx,
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const void* dict, size_t dictSize, /* dict can be released after init, a local copy is preserved within zcs */
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ZSTD_parameters params,
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unsigned long long pledgedSrcSize); /* pledgedSrcSize is optional and can be zero == unknown */
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ZSTDLIB_API size_t ZSTDMT_initCStream_usingCDict(ZSTDMT_CCtx* mtctx,
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const ZSTD_CDict* cdict,
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ZSTD_frameParameters fparams,
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unsigned long long pledgedSrcSize); /* note : zero means empty */
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/* ZSTDMT_parameter :
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* List of parameters that can be set using ZSTDMT_setMTCtxParameter() */
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typedef enum {
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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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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 */
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} ZSTDMT_parameter;
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/* ZSTDMT_setMTCtxParameter() :
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* allow setting individual parameters, one at a time, among a list of enums defined in ZSTDMT_parameter.
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* The function must be called typically after ZSTD_createCCtx() but __before ZSTDMT_init*() !__
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* Parameters not explicitly reset by ZSTDMT_init*() remain the same in consecutive compression sessions.
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* @return : 0, or an error code (which can be tested using ZSTD_isError()) */
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ZSTDLIB_API size_t ZSTDMT_setMTCtxParameter(ZSTDMT_CCtx* mtctx, ZSTDMT_parameter parameter, unsigned value);
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/*! ZSTDMT_compressStream_generic() :
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* Combines ZSTDMT_compressStream() with ZSTDMT_flushStream() or ZSTDMT_endStream()
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* depending on flush directive.
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* @return : minimum amount of data still to be flushed
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* 0 if fully flushed
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* or an error code */
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ZSTDLIB_API size_t ZSTDMT_compressStream_generic(ZSTDMT_CCtx* mtctx,
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ZSTD_outBuffer* output,
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ZSTD_inBuffer* input,
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ZSTD_EndDirective endOp);
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/* === Private definitions; never ever use directly === */
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size_t ZSTDMT_CCtxParam_setMTCtxParameter(ZSTD_CCtx_params* params, ZSTDMT_parameter parameter, unsigned value);
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/* ZSTDMT_CCtxParam_setNbThreads()
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* Set nbThreads, and clamp it correctly,
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* also reset jobSize and overlapLog */
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size_t ZSTDMT_CCtxParam_setNbThreads(ZSTD_CCtx_params* params, unsigned nbThreads);
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/* ZSTDMT_getNbThreads():
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* @return nb threads currently active in mtctx.
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* mtctx must be valid */
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size_t ZSTDMT_getNbThreads(const ZSTDMT_CCtx* mtctx);
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/*! ZSTDMT_initCStream_internal() :
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* Private use only. Init streaming operation.
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* expects params to be valid.
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* must receive dict, or cdict, or none, but not both.
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* @return : 0, or an error code */
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size_t ZSTDMT_initCStream_internal(ZSTDMT_CCtx* zcs,
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const void* dict, size_t dictSize, ZSTD_dictMode_e dictMode,
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const ZSTD_CDict* cdict,
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ZSTD_CCtx_params params, unsigned long long pledgedSrcSize);
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#if defined (__cplusplus)
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}
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#endif
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#endif /* ZSTDMT_COMPRESS_H */
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