c3ab9eb590
It is now dual-licensed BSD-3-Clause and GPL-2.0, we use the former. The PATENTS file is no longer applicable \o/ Also add zstd to COPYRIGHT.txt
116 lines
5.2 KiB
C++
116 lines
5.2 KiB
C++
/*
|
|
* 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).
|
|
*/
|
|
|
|
#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 <stddef.h> /* size_t */
|
|
#define ZSTD_STATIC_LINKING_ONLY /* ZSTD_parameters */
|
|
#include "zstd.h" /* ZSTD_inBuffer, ZSTD_outBuffer, ZSTDLIB_API */
|
|
|
|
|
|
/* === Memory management === */
|
|
typedef struct ZSTDMT_CCtx_s ZSTDMT_CCtx;
|
|
ZSTDLIB_API ZSTDMT_CCtx* ZSTDMT_createCCtx(unsigned nbThreads);
|
|
ZSTDLIB_API ZSTDMT_CCtx* ZSTDMT_createCCtx_advanced(unsigned nbThreads,
|
|
ZSTD_customMem cMem);
|
|
ZSTDLIB_API size_t ZSTDMT_freeCCtx(ZSTDMT_CCtx* mtctx);
|
|
|
|
ZSTDLIB_API size_t ZSTDMT_sizeof_CCtx(ZSTDMT_CCtx* mtctx);
|
|
|
|
|
|
/* === Simple buffer-to-butter one-pass 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); /**< pledgedSrcSize is optional and can be zero == unknown */
|
|
|
|
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 === */
|
|
|
|
#ifndef ZSTDMT_SECTION_SIZE_MIN
|
|
# define ZSTDMT_SECTION_SIZE_MIN (1U << 20) /* 1 MB - Minimum size of each compression job */
|
|
#endif
|
|
|
|
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 const 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 */
|
|
|
|
/* ZSDTMT_parameter :
|
|
* List of parameters that can be set using ZSTDMT_setMTCtxParameter() */
|
|
typedef enum {
|
|
ZSTDMT_p_sectionSize, /* size of input "section". Each section is compressed in parallel. 0 means default, which is dynamically determined within compression functions */
|
|
ZSTDMT_p_overlapSectionLog /* Log of overlapped section; 0 == no overlap, 6(default) == use 1/8th of window, >=9 == use full window */
|
|
} ZSDTMT_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().
|
|
* 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, ZSDTMT_parameter parameter, unsigned value);
|
|
|
|
|
|
/*! ZSTDMT_compressStream_generic() :
|
|
* Combines ZSTDMT_compressStream() with 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 */
|
|
ZSTDLIB_API size_t ZSTDMT_compressStream_generic(ZSTDMT_CCtx* mtctx,
|
|
ZSTD_outBuffer* output,
|
|
ZSTD_inBuffer* input,
|
|
ZSTD_EndDirective endOp);
|
|
|
|
|
|
|
|
#if defined (__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif /* ZSTDMT_COMPRESS_H */
|