/* * Copyright (c) 2016-present, Yann Collet, Facebook, Inc. * All rights reserved. * * This source code is licensed under both the BSD-style license (found in the * LICENSE file in the root directory of this source tree) and the GPLv2 (found * in the COPYING file in the root directory of this source tree). * You may select, at your option, one of the above-listed licenses. */ #ifndef ZSTDMT_COMPRESS_H #define ZSTDMT_COMPRESS_H #if defined (__cplusplus) extern "C" { #endif /* Note : This is an internal API. * Some methods are still exposed (ZSTDLIB_API), * because it used to be the only way to invoke MT compression. * Now, it's recommended to use ZSTD_compress_generic() instead. * These methods will stop being exposed in a future version */ /* === Dependencies === */ #include /* size_t */ #define ZSTD_STATIC_LINKING_ONLY /* ZSTD_parameters */ #include "zstd.h" /* ZSTD_inBuffer, ZSTD_outBuffer, ZSTDLIB_API */ /* === Constants === */ #define ZSTDMT_NBWORKERS_MAX 200 #ifndef ZSTDMT_JOBSIZE_MIN # define ZSTDMT_JOBSIZE_MIN (1U << 20) /* 1 MB - Minimum size of each compression job */ #endif #define ZSTDMT_JOBSIZE_MAX (MEM_32bits() ? (512 MB) : (1 GB)) /* note : limited by `jobSize` type, which is `int` */ /* === Memory management === */ typedef struct ZSTDMT_CCtx_s ZSTDMT_CCtx; ZSTDLIB_API ZSTDMT_CCtx* ZSTDMT_createCCtx(unsigned nbWorkers); ZSTDLIB_API ZSTDMT_CCtx* ZSTDMT_createCCtx_advanced(unsigned nbWorkers, ZSTD_customMem cMem); ZSTDLIB_API size_t ZSTDMT_freeCCtx(ZSTDMT_CCtx* mtctx); ZSTDLIB_API size_t ZSTDMT_sizeof_CCtx(ZSTDMT_CCtx* mtctx); /* === Simple one-pass compression function === */ ZSTDLIB_API size_t ZSTDMT_compressCCtx(ZSTDMT_CCtx* mtctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize, int compressionLevel); /* === Streaming functions === */ ZSTDLIB_API size_t ZSTDMT_initCStream(ZSTDMT_CCtx* mtctx, int compressionLevel); 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" */ ZSTDLIB_API size_t ZSTDMT_compressStream(ZSTDMT_CCtx* mtctx, ZSTD_outBuffer* output, ZSTD_inBuffer* input); 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()) */ 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()) */ /* === Advanced functions and parameters === */ ZSTDLIB_API size_t ZSTDMT_compress_advanced(ZSTDMT_CCtx* mtctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize, const ZSTD_CDict* cdict, ZSTD_parameters params, unsigned overlapLog); ZSTDLIB_API size_t ZSTDMT_initCStream_advanced(ZSTDMT_CCtx* mtctx, const void* dict, size_t dictSize, /* dict can be released after init, a local copy is preserved within zcs */ ZSTD_parameters params, unsigned long long pledgedSrcSize); /* pledgedSrcSize is optional and can be zero == unknown */ ZSTDLIB_API size_t ZSTDMT_initCStream_usingCDict(ZSTDMT_CCtx* mtctx, const ZSTD_CDict* cdict, ZSTD_frameParameters fparams, unsigned long long pledgedSrcSize); /* note : zero means empty */ /* ZSTDMT_parameter : * List of parameters that can be set using ZSTDMT_setMTCtxParameter() */ typedef enum { 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. */ 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 */ ZSTDMT_p_rsyncable /* Enables rsyncable mode. */ } ZSTDMT_parameter; /* ZSTDMT_setMTCtxParameter() : * allow setting individual parameters, one at a time, among a list of enums defined in ZSTDMT_parameter. * The function must be called typically after ZSTD_createCCtx() but __before ZSTDMT_init*() !__ * Parameters not explicitly reset by ZSTDMT_init*() remain the same in consecutive compression sessions. * @return : 0, or an error code (which can be tested using ZSTD_isError()) */ ZSTDLIB_API size_t ZSTDMT_setMTCtxParameter(ZSTDMT_CCtx* mtctx, ZSTDMT_parameter parameter, unsigned value); /* ZSTDMT_getMTCtxParameter() : * Query the ZSTDMT_CCtx for a parameter value. * @return : 0, or an error code (which can be tested using ZSTD_isError()) */ ZSTDLIB_API size_t ZSTDMT_getMTCtxParameter(ZSTDMT_CCtx* mtctx, ZSTDMT_parameter parameter, unsigned* value); /*! ZSTDMT_compressStream_generic() : * Combines ZSTDMT_compressStream() with optional ZSTDMT_flushStream() or ZSTDMT_endStream() * depending on flush directive. * @return : minimum amount of data still to be flushed * 0 if fully flushed * or an error code * note : needs to be init using any ZSTD_initCStream*() variant */ ZSTDLIB_API size_t ZSTDMT_compressStream_generic(ZSTDMT_CCtx* mtctx, ZSTD_outBuffer* output, ZSTD_inBuffer* input, ZSTD_EndDirective endOp); /* ======================================================== * === Private interface, for use by ZSTD_compress.c === * === Not exposed in libzstd. Never invoke directly === * ======================================================== */ /*! ZSTDMT_toFlushNow() * Tell how many bytes are ready to be flushed immediately. * Probe the oldest active job (not yet entirely flushed) and check its output buffer. * If return 0, it means there is no active job, * or, it means oldest job is still active, but everything produced has been flushed so far, * therefore flushing is limited by speed of oldest job. */ size_t ZSTDMT_toFlushNow(ZSTDMT_CCtx* mtctx); /*! ZSTDMT_CCtxParam_setMTCtxParameter() * like ZSTDMT_setMTCtxParameter(), but into a ZSTD_CCtx_Params */ size_t ZSTDMT_CCtxParam_setMTCtxParameter(ZSTD_CCtx_params* params, ZSTDMT_parameter parameter, unsigned value); /*! ZSTDMT_CCtxParam_setNbWorkers() * Set nbWorkers, and clamp it. * Also reset jobSize and overlapLog */ size_t ZSTDMT_CCtxParam_setNbWorkers(ZSTD_CCtx_params* params, unsigned nbWorkers); /*! ZSTDMT_updateCParams_whileCompressing() : * Updates only a selected set of compression parameters, to remain compatible with current frame. * New parameters will be applied to next compression job. */ void ZSTDMT_updateCParams_whileCompressing(ZSTDMT_CCtx* mtctx, const ZSTD_CCtx_params* cctxParams); /*! ZSTDMT_getFrameProgression(): * tells how much data has been consumed (input) and produced (output) for current frame. * able to count progression inside worker threads. */ ZSTD_frameProgression ZSTDMT_getFrameProgression(ZSTDMT_CCtx* mtctx); /*! ZSTDMT_initCStream_internal() : * Private use only. Init streaming operation. * expects params to be valid. * must receive dict, or cdict, or none, but not both. * @return : 0, or an error code */ size_t ZSTDMT_initCStream_internal(ZSTDMT_CCtx* zcs, const void* dict, size_t dictSize, ZSTD_dictContentType_e dictContentType, const ZSTD_CDict* cdict, ZSTD_CCtx_params params, unsigned long long pledgedSrcSize); #if defined (__cplusplus) } #endif #endif /* ZSTDMT_COMPRESS_H */