94 lines
3.6 KiB
C
94 lines
3.6 KiB
C
|
/*
|
||
|
|
* Copyright (c) Yann Collet, Meta Platforms, Inc. and affiliates.
|
||
|
|
* 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 ZSTD_V02_H_4174539423
|
||
|
|
#define ZSTD_V02_H_4174539423
|
||
|
|
|
||
|
|
#if defined (__cplusplus)
|
||
|
|
extern "C" {
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* *************************************
|
||
|
|
* Includes
|
||
|
|
***************************************/
|
||
|
|
#include <stddef.h> /* size_t */
|
||
|
|
|
||
|
|
|
||
|
|
/* *************************************
|
||
|
|
* Simple one-step function
|
||
|
|
***************************************/
|
||
|
|
/**
|
||
|
|
ZSTDv02_decompress() : decompress ZSTD frames compliant with v0.2.x format
|
||
|
|
compressedSize : is the exact source size
|
||
|
|
maxOriginalSize : is the size of the 'dst' buffer, which must be already allocated.
|
||
|
|
It must be equal or larger than originalSize, otherwise decompression will fail.
|
||
|
|
return : the number of bytes decompressed into destination buffer (originalSize)
|
||
|
|
or an errorCode if it fails (which can be tested using ZSTDv01_isError())
|
||
|
|
*/
|
||
|
|
size_t ZSTDv02_decompress( void* dst, size_t maxOriginalSize,
|
||
|
|
const void* src, size_t compressedSize);
|
||
|
|
|
||
|
|
/**
|
||
|
|
ZSTDv02_findFrameSizeInfoLegacy() : get the source length and decompressed bound of a ZSTD frame compliant with v0.2.x format
|
||
|
|
srcSize : The size of the 'src' buffer, at least as large as the frame pointed to by 'src'
|
||
|
|
cSize (output parameter) : the number of bytes that would be read to decompress this frame
|
||
|
|
or an error code if it fails (which can be tested using ZSTDv01_isError())
|
||
|
|
dBound (output parameter) : an upper-bound for the decompressed size of the data in the frame
|
||
|
|
or ZSTD_CONTENTSIZE_ERROR if an error occurs
|
||
|
|
|
||
|
|
note : assumes `cSize` and `dBound` are _not_ NULL.
|
||
|
|
*/
|
||
|
|
void ZSTDv02_findFrameSizeInfoLegacy(const void *src, size_t srcSize,
|
||
|
|
size_t* cSize, unsigned long long* dBound);
|
||
|
|
|
||
|
|
/**
|
||
|
|
ZSTDv02_isError() : tells if the result of ZSTDv02_decompress() is an error
|
||
|
|
*/
|
||
|
|
unsigned ZSTDv02_isError(size_t code);
|
||
|
|
|
||
|
|
|
||
|
|
/* *************************************
|
||
|
|
* Advanced functions
|
||
|
|
***************************************/
|
||
|
|
typedef struct ZSTDv02_Dctx_s ZSTDv02_Dctx;
|
||
|
|
ZSTDv02_Dctx* ZSTDv02_createDCtx(void);
|
||
|
|
size_t ZSTDv02_freeDCtx(ZSTDv02_Dctx* dctx);
|
||
|
|
|
||
|
|
size_t ZSTDv02_decompressDCtx(void* ctx,
|
||
|
|
void* dst, size_t maxOriginalSize,
|
||
|
|
const void* src, size_t compressedSize);
|
||
|
|
|
||
|
|
/* *************************************
|
||
|
|
* Streaming functions
|
||
|
|
***************************************/
|
||
|
|
size_t ZSTDv02_resetDCtx(ZSTDv02_Dctx* dctx);
|
||
|
|
|
||
|
|
size_t ZSTDv02_nextSrcSizeToDecompress(ZSTDv02_Dctx* dctx);
|
||
|
|
size_t ZSTDv02_decompressContinue(ZSTDv02_Dctx* dctx, void* dst, size_t maxDstSize, const void* src, size_t srcSize);
|
||
|
|
/**
|
||
|
|
Use above functions alternatively.
|
||
|
|
ZSTD_nextSrcSizeToDecompress() tells how much bytes to provide as 'srcSize' to ZSTD_decompressContinue().
|
||
|
|
ZSTD_decompressContinue() will use previous data blocks to improve compression if they are located prior to current block.
|
||
|
|
Result is the number of bytes regenerated within 'dst'.
|
||
|
|
It can be zero, which is not an error; it just means ZSTD_decompressContinue() has decoded some header.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* *************************************
|
||
|
|
* Prefix - version detection
|
||
|
|
***************************************/
|
||
|
|
#define ZSTDv02_magicNumber 0xFD2FB522 /* v0.2 */
|
||
|
|
|
||
|
|
|
||
|
|
#if defined (__cplusplus)
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* ZSTD_V02_H_4174539423 */
|