114 lines
4.6 KiB
C++
114 lines
4.6 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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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, you must use ZSTD_compress2 and ZSTD_compressStream2() instead.
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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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/* === Dependencies === */
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#include "../common/zstd_deps.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 /* a different value can be selected at compile time */
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# define ZSTDMT_NBWORKERS_MAX ((sizeof(void*)==4) /*32-bit*/ ? 64 : 256)
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#endif
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#ifndef ZSTDMT_JOBSIZE_MIN /* a different value can be selected at compile time */
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# define ZSTDMT_JOBSIZE_MIN (512 KB)
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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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/* ========================================================
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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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/* === 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_CCtx* ZSTDMT_createCCtx_advanced(unsigned nbWorkers,
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ZSTD_customMem cMem,
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ZSTD_threadPool *pool);
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size_t ZSTDMT_freeCCtx(ZSTDMT_CCtx* mtctx);
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size_t ZSTDMT_sizeof_CCtx(ZSTDMT_CCtx* mtctx);
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/* === Streaming functions === */
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size_t ZSTDMT_nextInputSizeHint(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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* mtctx can be freshly constructed or reused from a prior compression.
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* If mtctx is reused, memory allocations from the prior compression may not be freed,
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* even if they are not needed for the current compression.
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* @return : 0, or an error code */
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size_t ZSTDMT_initCStream_internal(ZSTDMT_CCtx* mtctx,
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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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/*! 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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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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/*! 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_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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#if defined (__cplusplus)
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}
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#endif
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#endif /* ZSTDMT_COMPRESS_H */
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