213 lines
11 KiB
C
213 lines
11 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.
|
|
*/
|
|
|
|
/* ***************************************************************
|
|
* NOTES/WARNINGS
|
|
******************************************************************/
|
|
/* The streaming API defined here is deprecated.
|
|
* Consider migrating towards ZSTD_compressStream() API in `zstd.h`
|
|
* See 'lib/README.md'.
|
|
*****************************************************************/
|
|
|
|
#ifndef ZSTD_BUFFERED_H_23987
|
|
#define ZSTD_BUFFERED_H_23987
|
|
|
|
#if defined (__cplusplus)
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* *************************************
|
|
* Dependencies
|
|
***************************************/
|
|
#include <stddef.h> /* size_t */
|
|
|
|
|
|
/* ***************************************************************
|
|
* Compiler specifics
|
|
*****************************************************************/
|
|
/* ZSTD_DLL_EXPORT :
|
|
* Enable exporting of functions when building a Windows DLL */
|
|
#if defined(_WIN32) && defined(ZSTD_DLL_EXPORT) && (ZSTD_DLL_EXPORT==1)
|
|
# define ZSTDLIB_API __declspec(dllexport)
|
|
#else
|
|
# define ZSTDLIB_API
|
|
#endif
|
|
|
|
/* Deprecation warnings */
|
|
/* Should these warnings be a problem,
|
|
it is generally possible to disable them,
|
|
typically with -Wno-deprecated-declarations for gcc
|
|
or _CRT_SECURE_NO_WARNINGS in Visual.
|
|
Otherwise, it's also possible to define ZBUFF_DISABLE_DEPRECATE_WARNINGS */
|
|
#ifdef ZBUFF_DISABLE_DEPRECATE_WARNINGS
|
|
# define ZBUFF_DEPRECATED(message) /* disable deprecation warnings */
|
|
#else
|
|
# if (defined(__GNUC__) && (__GNUC__ >= 4)) || defined(__clang__)
|
|
# define ZBUFF_DEPRECATED(message) __attribute__((deprecated(message)))
|
|
# elif defined(__GNUC__) && (__GNUC__ >= 3)
|
|
# define ZBUFF_DEPRECATED(message) __attribute__((deprecated))
|
|
# elif defined(_MSC_VER)
|
|
# define ZBUFF_DEPRECATED(message) __declspec(deprecated(message))
|
|
# else
|
|
# pragma message("WARNING: You need to implement ZBUFF_DEPRECATED for this compiler")
|
|
# define ZBUFF_DEPRECATED(message)
|
|
# endif
|
|
#endif /* ZBUFF_DISABLE_DEPRECATE_WARNINGS */
|
|
|
|
|
|
/* *************************************
|
|
* Streaming functions
|
|
***************************************/
|
|
/* This is the easier "buffered" streaming API,
|
|
* using an internal buffer to lift all restrictions on user-provided buffers
|
|
* which can be any size, any place, for both input and output.
|
|
* ZBUFF and ZSTD are 100% interoperable,
|
|
* frames created by one can be decoded by the other one */
|
|
|
|
typedef struct ZBUFF_CCtx_s ZBUFF_CCtx;
|
|
ZBUFF_DEPRECATED("use ZSTD_createCStream") ZBUFF_CCtx* ZBUFF_createCCtx(void);
|
|
ZBUFF_DEPRECATED("use ZSTD_freeCStream") size_t ZBUFF_freeCCtx(ZBUFF_CCtx* cctx);
|
|
|
|
ZBUFF_DEPRECATED("use ZSTD_initCStream") size_t ZBUFF_compressInit(ZBUFF_CCtx* cctx, int compressionLevel);
|
|
ZBUFF_DEPRECATED("use ZSTD_initCStream_usingDict") size_t ZBUFF_compressInitDictionary(ZBUFF_CCtx* cctx, const void* dict, size_t dictSize, int compressionLevel);
|
|
|
|
ZBUFF_DEPRECATED("use ZSTD_compressStream") size_t ZBUFF_compressContinue(ZBUFF_CCtx* cctx, void* dst, size_t* dstCapacityPtr, const void* src, size_t* srcSizePtr);
|
|
ZBUFF_DEPRECATED("use ZSTD_flushStream") size_t ZBUFF_compressFlush(ZBUFF_CCtx* cctx, void* dst, size_t* dstCapacityPtr);
|
|
ZBUFF_DEPRECATED("use ZSTD_endStream") size_t ZBUFF_compressEnd(ZBUFF_CCtx* cctx, void* dst, size_t* dstCapacityPtr);
|
|
|
|
/*-*************************************************
|
|
* Streaming compression - howto
|
|
*
|
|
* A ZBUFF_CCtx object is required to track streaming operation.
|
|
* Use ZBUFF_createCCtx() and ZBUFF_freeCCtx() to create/release resources.
|
|
* ZBUFF_CCtx objects can be reused multiple times.
|
|
*
|
|
* Start by initializing ZBUF_CCtx.
|
|
* Use ZBUFF_compressInit() to start a new compression operation.
|
|
* Use ZBUFF_compressInitDictionary() for a compression which requires a dictionary.
|
|
*
|
|
* Use ZBUFF_compressContinue() repetitively to consume input stream.
|
|
* *srcSizePtr and *dstCapacityPtr can be any size.
|
|
* The function will report how many bytes were read or written within *srcSizePtr and *dstCapacityPtr.
|
|
* Note that it may not consume the entire input, in which case it's up to the caller to present again remaining data.
|
|
* The content of `dst` will be overwritten (up to *dstCapacityPtr) at each 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 just a hint, to improve latency)
|
|
* or an error code, which can be tested using ZBUFF_isError().
|
|
*
|
|
* At any moment, it's possible to flush whatever data remains within buffer, using ZBUFF_compressFlush().
|
|
* The nb of bytes written into `dst` will be reported into *dstCapacityPtr.
|
|
* Note that the function cannot output more than *dstCapacityPtr,
|
|
* therefore, some content might still be left into internal buffer if *dstCapacityPtr is too small.
|
|
* @return : nb of bytes still present into internal buffer (0 if it's empty)
|
|
* or an error code, which can be tested using ZBUFF_isError().
|
|
*
|
|
* ZBUFF_compressEnd() instructs to finish a frame.
|
|
* It will perform a flush and write frame epilogue.
|
|
* The epilogue is required for decoders to consider a frame completed.
|
|
* Similar to ZBUFF_compressFlush(), it may not be able to output the entire internal buffer content if *dstCapacityPtr is too small.
|
|
* In which case, call again ZBUFF_compressFlush() to complete the flush.
|
|
* @return : nb of bytes still present into internal buffer (0 if it's empty)
|
|
* or an error code, which can be tested using ZBUFF_isError().
|
|
*
|
|
* Hint : _recommended buffer_ sizes (not compulsory) : ZBUFF_recommendedCInSize() / ZBUFF_recommendedCOutSize()
|
|
* input : ZBUFF_recommendedCInSize==128 KB block size is the internal unit, use this value to reduce intermediate stages (better latency)
|
|
* output : ZBUFF_recommendedCOutSize==ZSTD_compressBound(128 KB) + 3 + 3 : ensures it's always possible to write/flush/end a full block. Skip some buffering.
|
|
* By using both, it ensures that input will be entirely consumed, and output will always contain the result, reducing intermediate buffering.
|
|
* **************************************************/
|
|
|
|
|
|
typedef struct ZBUFF_DCtx_s ZBUFF_DCtx;
|
|
ZBUFF_DEPRECATED("use ZSTD_createDStream") ZBUFF_DCtx* ZBUFF_createDCtx(void);
|
|
ZBUFF_DEPRECATED("use ZSTD_freeDStream") size_t ZBUFF_freeDCtx(ZBUFF_DCtx* dctx);
|
|
|
|
ZBUFF_DEPRECATED("use ZSTD_initDStream") size_t ZBUFF_decompressInit(ZBUFF_DCtx* dctx);
|
|
ZBUFF_DEPRECATED("use ZSTD_initDStream_usingDict") size_t ZBUFF_decompressInitDictionary(ZBUFF_DCtx* dctx, const void* dict, size_t dictSize);
|
|
|
|
ZBUFF_DEPRECATED("use ZSTD_decompressStream") size_t ZBUFF_decompressContinue(ZBUFF_DCtx* dctx,
|
|
void* dst, size_t* dstCapacityPtr,
|
|
const void* src, size_t* srcSizePtr);
|
|
|
|
/*-***************************************************************************
|
|
* Streaming decompression howto
|
|
*
|
|
* A ZBUFF_DCtx object is required to track streaming operations.
|
|
* Use ZBUFF_createDCtx() and ZBUFF_freeDCtx() to create/release resources.
|
|
* Use ZBUFF_decompressInit() to start a new decompression operation,
|
|
* or ZBUFF_decompressInitDictionary() if decompression requires a dictionary.
|
|
* Note that ZBUFF_DCtx objects can be re-init multiple times.
|
|
*
|
|
* Use ZBUFF_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 : 0 when a frame is completely decoded and fully flushed,
|
|
* 1 when there is still some data left within internal buffer to flush,
|
|
* >1 when more data is expected, with value being a suggested next input size (it's just a hint, which helps latency),
|
|
* or an error code, which can be tested using ZBUFF_isError().
|
|
*
|
|
* Hint : recommended buffer sizes (not compulsory) : ZBUFF_recommendedDInSize() and ZBUFF_recommendedDOutSize()
|
|
* output : ZBUFF_recommendedDOutSize== 128 KB block size is the internal unit, it ensures it's always possible to write a full block when decoded.
|
|
* input : ZBUFF_recommendedDInSize == 128KB + 3;
|
|
* just follow indications from ZBUFF_decompressContinue() to minimize latency. It should always be <= 128 KB + 3 .
|
|
* *******************************************************************************/
|
|
|
|
|
|
/* *************************************
|
|
* Tool functions
|
|
***************************************/
|
|
ZBUFF_DEPRECATED("use ZSTD_isError") unsigned ZBUFF_isError(size_t errorCode);
|
|
ZBUFF_DEPRECATED("use ZSTD_getErrorName") const char* ZBUFF_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 */
|
|
ZBUFF_DEPRECATED("use ZSTD_CStreamInSize") size_t ZBUFF_recommendedCInSize(void);
|
|
ZBUFF_DEPRECATED("use ZSTD_CStreamOutSize") size_t ZBUFF_recommendedCOutSize(void);
|
|
ZBUFF_DEPRECATED("use ZSTD_DStreamInSize") size_t ZBUFF_recommendedDInSize(void);
|
|
ZBUFF_DEPRECATED("use ZSTD_DStreamOutSize") size_t ZBUFF_recommendedDOutSize(void);
|
|
|
|
|
|
#ifdef ZBUFF_STATIC_LINKING_ONLY
|
|
|
|
/* ====================================================================================
|
|
* The definitions in this section are considered experimental.
|
|
* They should never be used in association with a dynamic library, as they may change in the future.
|
|
* They are provided for advanced usages.
|
|
* Use them only in association with static linking.
|
|
* ==================================================================================== */
|
|
|
|
/*--- Dependency ---*/
|
|
#define ZSTD_STATIC_LINKING_ONLY /* ZSTD_parameters, ZSTD_customMem */
|
|
#include "zstd.h"
|
|
|
|
|
|
/*--- Custom memory allocator ---*/
|
|
/*! ZBUFF_createCCtx_advanced() :
|
|
* Create a ZBUFF compression context using external alloc and free functions */
|
|
ZBUFF_DEPRECATED("use ZSTD_createCStream_advanced") ZBUFF_CCtx* ZBUFF_createCCtx_advanced(ZSTD_customMem customMem);
|
|
|
|
/*! ZBUFF_createDCtx_advanced() :
|
|
* Create a ZBUFF decompression context using external alloc and free functions */
|
|
ZBUFF_DEPRECATED("use ZSTD_createDStream_advanced") ZBUFF_DCtx* ZBUFF_createDCtx_advanced(ZSTD_customMem customMem);
|
|
|
|
|
|
/*--- Advanced Streaming Initialization ---*/
|
|
ZBUFF_DEPRECATED("use ZSTD_initDStream_usingDict") size_t ZBUFF_compressInit_advanced(ZBUFF_CCtx* zbc,
|
|
const void* dict, size_t dictSize,
|
|
ZSTD_parameters params, unsigned long long pledgedSrcSize);
|
|
|
|
#endif /* ZBUFF_STATIC_LINKING_ONLY */
|
|
|
|
|
|
#if defined (__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif /* ZSTD_BUFFERED_H_23987 */
|