157 lines
6.9 KiB
C
157 lines
6.9 KiB
C
/**
|
|
* Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This source code is licensed under the BSD-style license found in the
|
|
* LICENSE file in the root directory of this source tree. An additional grant
|
|
* of patent rights can be found in the PATENTS file in the same directory.
|
|
*/
|
|
|
|
#ifndef ZSTDv05_H
|
|
#define ZSTDv05_H
|
|
|
|
#if defined (__cplusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
/*-*************************************
|
|
* Dependencies
|
|
***************************************/
|
|
#include <stddef.h> /* size_t */
|
|
#include "mem.h" /* U64, U32 */
|
|
|
|
|
|
/* *************************************
|
|
* Simple functions
|
|
***************************************/
|
|
/*! ZSTDv05_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 ZSTDv05_isError()) */
|
|
size_t ZSTDv05_decompress( void* dst, size_t dstCapacity,
|
|
const void* src, size_t compressedSize);
|
|
|
|
/**
|
|
ZSTDv05_getFrameSrcSize() : get the source length of a ZSTD frame
|
|
compressedSize : The size of the 'src' buffer, at least as large as the frame pointed to by 'src'
|
|
return : the number of bytes that would be read to decompress this frame
|
|
or an errorCode if it fails (which can be tested using ZSTDv05_isError())
|
|
*/
|
|
size_t ZSTDv05_findFrameCompressedSize(const void* src, size_t compressedSize);
|
|
|
|
/* *************************************
|
|
* Helper functions
|
|
***************************************/
|
|
/* Error Management */
|
|
unsigned ZSTDv05_isError(size_t code); /*!< tells if a `size_t` function result is an error code */
|
|
const char* ZSTDv05_getErrorName(size_t code); /*!< provides readable string for an error code */
|
|
|
|
|
|
/* *************************************
|
|
* Explicit memory management
|
|
***************************************/
|
|
/** Decompression context */
|
|
typedef struct ZSTDv05_DCtx_s ZSTDv05_DCtx;
|
|
ZSTDv05_DCtx* ZSTDv05_createDCtx(void);
|
|
size_t ZSTDv05_freeDCtx(ZSTDv05_DCtx* dctx); /*!< @return : errorCode */
|
|
|
|
/** ZSTDv05_decompressDCtx() :
|
|
* Same as ZSTDv05_decompress(), but requires an already allocated ZSTDv05_DCtx (see ZSTDv05_createDCtx()) */
|
|
size_t ZSTDv05_decompressDCtx(ZSTDv05_DCtx* ctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize);
|
|
|
|
|
|
/*-***********************
|
|
* Simple Dictionary API
|
|
*************************/
|
|
/*! ZSTDv05_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 ZSTDv05_decompressDCtx() */
|
|
size_t ZSTDv05_decompress_usingDict(ZSTDv05_DCtx* dctx,
|
|
void* dst, size_t dstCapacity,
|
|
const void* src, size_t srcSize,
|
|
const void* dict,size_t dictSize);
|
|
|
|
/*-************************
|
|
* Advanced Streaming API
|
|
***************************/
|
|
typedef enum { ZSTDv05_fast, ZSTDv05_greedy, ZSTDv05_lazy, ZSTDv05_lazy2, ZSTDv05_btlazy2, ZSTDv05_opt, ZSTDv05_btopt } ZSTDv05_strategy;
|
|
typedef struct {
|
|
U64 srcSize;
|
|
U32 windowLog; /* the only useful information to retrieve */
|
|
U32 contentLog; U32 hashLog; U32 searchLog; U32 searchLength; U32 targetLength; ZSTDv05_strategy strategy;
|
|
} ZSTDv05_parameters;
|
|
size_t ZSTDv05_getFrameParams(ZSTDv05_parameters* params, const void* src, size_t srcSize);
|
|
|
|
size_t ZSTDv05_decompressBegin_usingDict(ZSTDv05_DCtx* dctx, const void* dict, size_t dictSize);
|
|
void ZSTDv05_copyDCtx(ZSTDv05_DCtx* dstDCtx, const ZSTDv05_DCtx* srcDCtx);
|
|
size_t ZSTDv05_nextSrcSizeToDecompress(ZSTDv05_DCtx* dctx);
|
|
size_t ZSTDv05_decompressContinue(ZSTDv05_DCtx* dctx, void* dst, size_t dstCapacity, const void* src, size_t srcSize);
|
|
|
|
|
|
/*-***********************
|
|
* ZBUFF API
|
|
*************************/
|
|
typedef struct ZBUFFv05_DCtx_s ZBUFFv05_DCtx;
|
|
ZBUFFv05_DCtx* ZBUFFv05_createDCtx(void);
|
|
size_t ZBUFFv05_freeDCtx(ZBUFFv05_DCtx* dctx);
|
|
|
|
size_t ZBUFFv05_decompressInit(ZBUFFv05_DCtx* dctx);
|
|
size_t ZBUFFv05_decompressInitDictionary(ZBUFFv05_DCtx* dctx, const void* dict, size_t dictSize);
|
|
|
|
size_t ZBUFFv05_decompressContinue(ZBUFFv05_DCtx* dctx,
|
|
void* dst, size_t* dstCapacityPtr,
|
|
const void* src, size_t* srcSizePtr);
|
|
|
|
/*-***************************************************************************
|
|
* Streaming decompression
|
|
*
|
|
* A ZBUFFv05_DCtx object is required to track streaming operations.
|
|
* Use ZBUFFv05_createDCtx() and ZBUFFv05_freeDCtx() to create/release resources.
|
|
* Use ZBUFFv05_decompressInit() to start a new decompression operation,
|
|
* or ZBUFFv05_decompressInitDictionary() if decompression requires a dictionary.
|
|
* Note that ZBUFFv05_DCtx objects can be reused multiple times.
|
|
*
|
|
* Use ZBUFFv05_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 ZBUFFv05_isError().
|
|
*
|
|
* Hint : recommended buffer sizes (not compulsory) : ZBUFFv05_recommendedDInSize() / ZBUFFv05_recommendedDOutSize()
|
|
* output : ZBUFFv05_recommendedDOutSize==128 KB block size is the internal unit, it ensures it's always possible to write a full block when decoded.
|
|
* input : ZBUFFv05_recommendedDInSize==128Kb+3; just follow indications from ZBUFFv05_decompressContinue() to minimize latency. It should always be <= 128 KB + 3 .
|
|
* *******************************************************************************/
|
|
|
|
|
|
/* *************************************
|
|
* Tool functions
|
|
***************************************/
|
|
unsigned ZBUFFv05_isError(size_t errorCode);
|
|
const char* ZBUFFv05_getErrorName(size_t errorCode);
|
|
|
|
/** Functions below provide recommended buffer sizes for Compression or Decompression operations.
|
|
* These sizes are just hints, and tend to offer better latency */
|
|
size_t ZBUFFv05_recommendedDInSize(void);
|
|
size_t ZBUFFv05_recommendedDOutSize(void);
|
|
|
|
|
|
|
|
/*-*************************************
|
|
* Constants
|
|
***************************************/
|
|
#define ZSTDv05_MAGICNUMBER 0xFD2FB525 /* v0.5 */
|
|
|
|
|
|
|
|
|
|
#if defined (__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif /* ZSTDv0505_H */
|