164 lines
7.2 KiB
C
164 lines
7.2 KiB
C
/*
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zstd_v05 - decoder for 0.5 format
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Header File
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Copyright (C) 2014-2016, Yann Collet.
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BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following disclaimer
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in the documentation and/or other materials provided with the
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distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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You can contact the author at :
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- zstd source repository : https://github.com/Cyan4973/zstd
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*/
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#ifndef ZSTDv05_H
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#define ZSTDv05_H
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#if defined (__cplusplus)
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extern "C" {
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#endif
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/*-*************************************
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* Dependencies
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***************************************/
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#include <stddef.h> /* size_t */
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/* *************************************
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* Simple functions
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***************************************/
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/*! ZSTDv05_decompress() :
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`compressedSize` : is the _exact_ size of the compressed blob, otherwise decompression will fail.
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`dstCapacity` must be large enough, equal or larger than originalSize.
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@return : the number of bytes decompressed into `dst` (<= `dstCapacity`),
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or an errorCode if it fails (which can be tested using ZSTDv05_isError()) */
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size_t ZSTDv05_decompress( void* dst, size_t dstCapacity,
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const void* src, size_t compressedSize);
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/* *************************************
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* Helper functions
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***************************************/
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/* Error Management */
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unsigned ZSTDv05_isError(size_t code); /*!< tells if a `size_t` function result is an error code */
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const char* ZSTDv05_getErrorName(size_t code); /*!< provides readable string for an error code */
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/* *************************************
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* Explicit memory management
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***************************************/
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/** Decompression context */
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typedef struct ZSTDv05_DCtx_s ZSTDv05_DCtx;
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ZSTDv05_DCtx* ZSTDv05_createDCtx(void);
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size_t ZSTDv05_freeDCtx(ZSTDv05_DCtx* dctx); /*!< @return : errorCode */
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/** ZSTDv05_decompressDCtx() :
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* Same as ZSTDv05_decompress(), but requires an already allocated ZSTDv05_DCtx (see ZSTDv05_createDCtx()) */
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size_t ZSTDv05_decompressDCtx(ZSTDv05_DCtx* ctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize);
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/*-***********************
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* Simple Dictionary API
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*************************/
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/*! ZSTDv05_decompress_usingDict() :
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* Decompression using a pre-defined Dictionary content (see dictBuilder).
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* Dictionary must be identical to the one used during compression, otherwise regenerated data will be corrupted.
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* Note : dict can be NULL, in which case, it's equivalent to ZSTDv05_decompressDCtx() */
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size_t ZSTDv05_decompress_usingDict(ZSTDv05_DCtx* dctx,
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void* dst, size_t dstCapacity,
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const void* src, size_t srcSize,
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const void* dict,size_t dictSize);
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/*-************************
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* Advanced Streaming API
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***************************/
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size_t ZSTDv05_decompressBegin_usingDict(ZSTDv05_DCtx* dctx, const void* dict, size_t dictSize);
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void ZSTDv05_copyDCtx(ZSTDv05_DCtx* dstDCtx, const ZSTDv05_DCtx* srcDCtx);
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size_t ZSTDv05_nextSrcSizeToDecompress(ZSTDv05_DCtx* dctx);
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size_t ZSTDv05_decompressContinue(ZSTDv05_DCtx* dctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize);
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/*-***********************
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* ZBUFF API
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*************************/
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typedef struct ZBUFFv05_DCtx_s ZBUFFv05_DCtx;
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ZBUFFv05_DCtx* ZBUFFv05_createDCtx(void);
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size_t ZBUFFv05_freeDCtx(ZBUFFv05_DCtx* dctx);
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size_t ZBUFFv05_decompressInit(ZBUFFv05_DCtx* dctx);
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size_t ZBUFFv05_decompressInitDictionary(ZBUFFv05_DCtx* dctx, const void* dict, size_t dictSize);
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size_t ZBUFFv05_decompressContinue(ZBUFFv05_DCtx* dctx,
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void* dst, size_t* dstCapacityPtr,
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const void* src, size_t* srcSizePtr);
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/*-***************************************************************************
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* Streaming decompression
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*
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* A ZBUFFv05_DCtx object is required to track streaming operations.
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* Use ZBUFFv05_createDCtx() and ZBUFFv05_freeDCtx() to create/release resources.
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* Use ZBUFFv05_decompressInit() to start a new decompression operation,
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* or ZBUFFv05_decompressInitDictionary() if decompression requires a dictionary.
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* Note that ZBUFFv05_DCtx objects can be reused multiple times.
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*
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* Use ZBUFFv05_decompressContinue() repetitively to consume your input.
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* *srcSizePtr and *dstCapacityPtr can be any size.
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* The function will report how many bytes were read or written by modifying *srcSizePtr and *dstCapacityPtr.
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* Note that it may not consume the entire input, in which case it's up to the caller to present remaining input again.
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* The content of @dst will be overwritten (up to *dstCapacityPtr) at each function call, so save its content if it matters or change @dst.
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* @return : a hint to preferred nb of bytes to use as input for next function call (it's only a hint, to help latency)
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* or 0 when a frame is completely decoded
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* or an error code, which can be tested using ZBUFFv05_isError().
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*
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* Hint : recommended buffer sizes (not compulsory) : ZBUFFv05_recommendedDInSize() / ZBUFFv05_recommendedDOutSize()
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* output : ZBUFFv05_recommendedDOutSize==128 KB block size is the internal unit, it ensures it's always possible to write a full block when decoded.
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* input : ZBUFFv05_recommendedDInSize==128Kb+3; just follow indications from ZBUFFv05_decompressContinue() to minimize latency. It should always be <= 128 KB + 3 .
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* *******************************************************************************/
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/* *************************************
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* Tool functions
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***************************************/
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unsigned ZBUFFv05_isError(size_t errorCode);
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const char* ZBUFFv05_getErrorName(size_t errorCode);
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/** Functions below provide recommended buffer sizes for Compression or Decompression operations.
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* These sizes are just hints, and tend to offer better latency */
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size_t ZBUFFv05_recommendedDInSize(void);
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size_t ZBUFFv05_recommendedDOutSize(void);
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/*-*************************************
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* Constants
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***************************************/
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#define ZSTDv05_MAGICNUMBER 0xFD2FB525 /* v0.5 */
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#if defined (__cplusplus)
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}
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#endif
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#endif /* ZSTDv0505_H */
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