186 lines
8.3 KiB
C
186 lines
8.3 KiB
C
/*
|
|
zstd_v06 - decoder for 0.6 format
|
|
Header File
|
|
Copyright (C) 2014-2016, Yann Collet.
|
|
|
|
BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are
|
|
met:
|
|
* Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
* Redistributions in binary form must reproduce the above
|
|
copyright notice, this list of conditions and the following disclaimer
|
|
in the documentation and/or other materials provided with the
|
|
distribution.
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
You can contact the author at :
|
|
- zstd source repository : https://github.com/Cyan4973/zstd
|
|
*/
|
|
#ifndef ZSTDv06_H
|
|
#define ZSTDv06_H
|
|
|
|
#if defined (__cplusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
/*-*************************************
|
|
* Dependencies
|
|
***************************************/
|
|
#include <stddef.h> /* size_t */
|
|
|
|
|
|
/*-***************************************************************
|
|
* Export parameters
|
|
*****************************************************************/
|
|
/*!
|
|
* ZSTDv06_DLL_EXPORT :
|
|
* Enable exporting of functions when building a Windows DLL
|
|
*/
|
|
#if defined(_WIN32) && defined(ZSTDv06_DLL_EXPORT) && (ZSTDv06_DLL_EXPORT==1)
|
|
# define ZSTDLIB_API __declspec(dllexport)
|
|
#else
|
|
# define ZSTDLIB_API
|
|
#endif
|
|
|
|
|
|
/* *************************************
|
|
* Simple functions
|
|
***************************************/
|
|
/*! ZSTDv06_decompress() :
|
|
`compressedSize` : is the _exact_ size of the compressed blob, otherwise decompression will fail.
|
|
`dstCapacity` must be large enough, equal or larger than originalSize.
|
|
@return : the number of bytes decompressed into `dst` (<= `dstCapacity`),
|
|
or an errorCode if it fails (which can be tested using ZSTDv06_isError()) */
|
|
ZSTDLIB_API size_t ZSTDv06_decompress( void* dst, size_t dstCapacity,
|
|
const void* src, size_t compressedSize);
|
|
|
|
|
|
/* *************************************
|
|
* Helper functions
|
|
***************************************/
|
|
ZSTDLIB_API size_t ZSTDv06_compressBound(size_t srcSize); /*!< maximum compressed size (worst case scenario) */
|
|
|
|
/* Error Management */
|
|
ZSTDLIB_API unsigned ZSTDv06_isError(size_t code); /*!< tells if a `size_t` function result is an error code */
|
|
ZSTDLIB_API const char* ZSTDv06_getErrorName(size_t code); /*!< provides readable string for an error code */
|
|
|
|
|
|
/* *************************************
|
|
* Explicit memory management
|
|
***************************************/
|
|
/** Decompression context */
|
|
typedef struct ZSTDv06_DCtx_s ZSTDv06_DCtx;
|
|
ZSTDLIB_API ZSTDv06_DCtx* ZSTDv06_createDCtx(void);
|
|
ZSTDLIB_API size_t ZSTDv06_freeDCtx(ZSTDv06_DCtx* dctx); /*!< @return : errorCode */
|
|
|
|
/** ZSTDv06_decompressDCtx() :
|
|
* Same as ZSTDv06_decompress(), but requires an already allocated ZSTDv06_DCtx (see ZSTDv06_createDCtx()) */
|
|
ZSTDLIB_API size_t ZSTDv06_decompressDCtx(ZSTDv06_DCtx* ctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize);
|
|
|
|
|
|
/*-***********************
|
|
* Dictionary API
|
|
*************************/
|
|
/*! ZSTDv06_decompress_usingDict() :
|
|
* Decompression using a pre-defined Dictionary content (see dictBuilder).
|
|
* Dictionary must be identical to the one used during compression, otherwise regenerated data will be corrupted.
|
|
* Note : dict can be NULL, in which case, it's equivalent to ZSTDv06_decompressDCtx() */
|
|
ZSTDLIB_API size_t ZSTDv06_decompress_usingDict(ZSTDv06_DCtx* dctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize,
|
|
const void* dict,size_t dictSize);
|
|
|
|
|
|
/*-************************
|
|
* Advanced Streaming API
|
|
***************************/
|
|
|
|
typedef struct ZSTDv06_frameParams_s ZSTDv06_frameParams;
|
|
|
|
ZSTDLIB_API size_t ZSTDv06_getFrameParams(ZSTDv06_frameParams* fparamsPtr, const void* src, size_t srcSize); /**< doesn't consume input */
|
|
ZSTDLIB_API size_t ZSTDv06_decompressBegin_usingDict(ZSTDv06_DCtx* dctx, const void* dict, size_t dictSize);
|
|
ZSTDLIB_API void ZSTDv06_copyDCtx(ZSTDv06_DCtx* dctx, const ZSTDv06_DCtx* preparedDCtx);
|
|
|
|
ZSTDLIB_API size_t ZSTDv06_nextSrcSizeToDecompress(ZSTDv06_DCtx* dctx);
|
|
ZSTDLIB_API size_t ZSTDv06_decompressContinue(ZSTDv06_DCtx* dctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize);
|
|
|
|
|
|
|
|
/* *************************************
|
|
* ZBUFF API
|
|
***************************************/
|
|
|
|
typedef struct ZBUFFv06_DCtx_s ZBUFFv06_DCtx;
|
|
ZSTDLIB_API ZBUFFv06_DCtx* ZBUFFv06_createDCtx(void);
|
|
ZSTDLIB_API size_t ZBUFFv06_freeDCtx(ZBUFFv06_DCtx* dctx);
|
|
|
|
ZSTDLIB_API size_t ZBUFFv06_decompressInit(ZBUFFv06_DCtx* dctx);
|
|
ZSTDLIB_API size_t ZBUFFv06_decompressInitDictionary(ZBUFFv06_DCtx* dctx, const void* dict, size_t dictSize);
|
|
|
|
ZSTDLIB_API size_t ZBUFFv06_decompressContinue(ZBUFFv06_DCtx* dctx,
|
|
void* dst, size_t* dstCapacityPtr,
|
|
const void* src, size_t* srcSizePtr);
|
|
|
|
/*-***************************************************************************
|
|
* Streaming decompression howto
|
|
*
|
|
* A ZBUFFv06_DCtx object is required to track streaming operations.
|
|
* Use ZBUFFv06_createDCtx() and ZBUFFv06_freeDCtx() to create/release resources.
|
|
* Use ZBUFFv06_decompressInit() to start a new decompression operation,
|
|
* or ZBUFFv06_decompressInitDictionary() if decompression requires a dictionary.
|
|
* Note that ZBUFFv06_DCtx objects can be re-init multiple times.
|
|
*
|
|
* Use ZBUFFv06_decompressContinue() repetitively to consume your input.
|
|
* *srcSizePtr and *dstCapacityPtr can be any size.
|
|
* The function will report how many bytes were read or written by modifying *srcSizePtr and *dstCapacityPtr.
|
|
* Note that it may not consume the entire input, in which case it's up to the caller to present remaining input again.
|
|
* The content of `dst` will be overwritten (up to *dstCapacityPtr) at each function call, so save its content if it matters, or change `dst`.
|
|
* @return : a hint to preferred nb of bytes to use as input for next function call (it's only a hint, to help latency),
|
|
* or 0 when a frame is completely decoded,
|
|
* or an error code, which can be tested using ZBUFFv06_isError().
|
|
*
|
|
* Hint : recommended buffer sizes (not compulsory) : ZBUFFv06_recommendedDInSize() and ZBUFFv06_recommendedDOutSize()
|
|
* output : ZBUFFv06_recommendedDOutSize== 128 KB block size is the internal unit, it ensures it's always possible to write a full block when decoded.
|
|
* input : ZBUFFv06_recommendedDInSize == 128KB + 3;
|
|
* just follow indications from ZBUFFv06_decompressContinue() to minimize latency. It should always be <= 128 KB + 3 .
|
|
* *******************************************************************************/
|
|
|
|
|
|
/* *************************************
|
|
* Tool functions
|
|
***************************************/
|
|
ZSTDLIB_API unsigned ZBUFFv06_isError(size_t errorCode);
|
|
ZSTDLIB_API const char* ZBUFFv06_getErrorName(size_t errorCode);
|
|
|
|
/** Functions below provide recommended buffer sizes for Compression or Decompression operations.
|
|
* These sizes are just hints, they tend to offer better latency */
|
|
ZSTDLIB_API size_t ZBUFFv06_recommendedDInSize(void);
|
|
ZSTDLIB_API size_t ZBUFFv06_recommendedDOutSize(void);
|
|
|
|
|
|
/*-*************************************
|
|
* Constants
|
|
***************************************/
|
|
#define ZSTDv06_MAGICNUMBER 0xFD2FB526 /* v0.6 */
|
|
|
|
|
|
|
|
#if defined (__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif /* ZSTDv06_BUFFERED_H */
|