192 lines
8.9 KiB
C++
192 lines
8.9 KiB
C++
/*
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* Copyright (c) 2016-2020, 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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* These APIs used to be exposed with 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_compress2 and ZSTD_compressStream2()
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* instead.
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*
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* If you depend on these APIs and can't switch, then define
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* ZSTD_LEGACY_MULTITHREADED_API when making the dynamic library.
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* However, we may completely remove these functions in a future
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* release, so please switch soon.
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*
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* This API requires ZSTD_MULTITHREAD to be defined during compilation,
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* otherwise ZSTDMT_createCCtx*() will fail.
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*/
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#ifdef ZSTD_LEGACY_MULTITHREADED_API
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# define ZSTDMT_API ZSTDLIB_API
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#else
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# define ZSTDMT_API
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#endif
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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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/* === Constants === */
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#ifndef ZSTDMT_NBWORKERS_MAX
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# define ZSTDMT_NBWORKERS_MAX 200
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#endif
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#ifndef ZSTDMT_JOBSIZE_MIN
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# define ZSTDMT_JOBSIZE_MIN (1 MB)
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#endif
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#define ZSTDMT_JOBLOG_MAX (MEM_32bits() ? 29 : 30)
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#define ZSTDMT_JOBSIZE_MAX (MEM_32bits() ? (512 MB) : (1024 MB))
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/* === Memory management === */
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typedef struct ZSTDMT_CCtx_s ZSTDMT_CCtx;
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/* Requires ZSTD_MULTITHREAD to be defined during compilation, otherwise it will return NULL. */
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ZSTDMT_API ZSTDMT_CCtx* ZSTDMT_createCCtx(unsigned nbWorkers);
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/* Requires ZSTD_MULTITHREAD to be defined during compilation, otherwise it will return NULL. */
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ZSTDMT_API ZSTDMT_CCtx* ZSTDMT_createCCtx_advanced(unsigned nbWorkers,
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ZSTD_customMem cMem);
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ZSTDMT_API size_t ZSTDMT_freeCCtx(ZSTDMT_CCtx* mtctx);
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ZSTDMT_API size_t ZSTDMT_sizeof_CCtx(ZSTDMT_CCtx* mtctx);
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/* === Simple one-pass compression function === */
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ZSTDMT_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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ZSTDMT_API size_t ZSTDMT_initCStream(ZSTDMT_CCtx* mtctx, int compressionLevel);
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ZSTDMT_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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ZSTDMT_API size_t ZSTDMT_nextInputSizeHint(const ZSTDMT_CCtx* mtctx);
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ZSTDMT_API size_t ZSTDMT_compressStream(ZSTDMT_CCtx* mtctx, ZSTD_outBuffer* output, ZSTD_inBuffer* input);
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ZSTDMT_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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ZSTDMT_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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ZSTDMT_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 params,
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int overlapLog);
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ZSTDMT_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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ZSTDMT_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_overlapLog, /* Each job may reload a part of previous job to enhance compression 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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ZSTDMT_p_rsyncable /* Enables rsyncable mode. */
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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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ZSTDMT_API size_t ZSTDMT_setMTCtxParameter(ZSTDMT_CCtx* mtctx, ZSTDMT_parameter parameter, int value);
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/* ZSTDMT_getMTCtxParameter() :
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* Query the ZSTDMT_CCtx for a parameter value.
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* @return : 0, or an error code (which can be tested using ZSTD_isError()) */
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ZSTDMT_API size_t ZSTDMT_getMTCtxParameter(ZSTDMT_CCtx* mtctx, ZSTDMT_parameter parameter, int* value);
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/*! ZSTDMT_compressStream_generic() :
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* Combines ZSTDMT_compressStream() with optional 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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* note : needs to be init using any ZSTD_initCStream*() variant */
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ZSTDMT_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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/* ========================================================
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* === Private interface, for use by ZSTD_compress.c ===
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* === Not exposed in libzstd. Never invoke directly ===
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* ======================================================== */
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/*! ZSTDMT_toFlushNow()
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* Tell how many bytes are ready to be flushed immediately.
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* Probe the oldest active job (not yet entirely flushed) and check its output buffer.
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* If return 0, it means there is no active job,
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* or, it means oldest job is still active, but everything produced has been flushed so far,
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* therefore flushing is limited by speed of oldest job. */
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size_t ZSTDMT_toFlushNow(ZSTDMT_CCtx* mtctx);
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/*! ZSTDMT_CCtxParam_setMTCtxParameter()
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* like ZSTDMT_setMTCtxParameter(), but into a ZSTD_CCtx_Params */
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size_t ZSTDMT_CCtxParam_setMTCtxParameter(ZSTD_CCtx_params* params, ZSTDMT_parameter parameter, int value);
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/*! ZSTDMT_CCtxParam_setNbWorkers()
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* Set nbWorkers, and clamp it.
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* Also reset jobSize and overlapLog */
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size_t ZSTDMT_CCtxParam_setNbWorkers(ZSTD_CCtx_params* params, unsigned nbWorkers);
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/*! ZSTDMT_updateCParams_whileCompressing() :
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* Updates only a selected set of compression parameters, to remain compatible with current frame.
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* New parameters will be applied to next compression job. */
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void ZSTDMT_updateCParams_whileCompressing(ZSTDMT_CCtx* mtctx, const ZSTD_CCtx_params* cctxParams);
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/*! ZSTDMT_getFrameProgression():
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* tells how much data has been consumed (input) and produced (output) for current frame.
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* able to count progression inside worker threads.
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*/
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ZSTD_frameProgression ZSTDMT_getFrameProgression(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_dictContentType_e dictContentType,
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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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