1/* 2 * Copyright (c) Yann Collet, Facebook, Inc. 3 * All rights reserved. 4 * 5 * This source code is licensed under both the BSD-style license (found in the 6 * LICENSE file in the root directory of this source tree) and the GPLv2 (found 7 * in the COPYING file in the root directory of this source tree). 8 * You may select, at your option, one of the above-listed licenses. 9 */ 10 11/* *************************************************************** 12* NOTES/WARNINGS 13******************************************************************/ 14/* The streaming API defined here is deprecated. 15 * Consider migrating towards ZSTD_compressStream() API in `zstd.h` 16 * See 'lib/README.md'. 17 *****************************************************************/ 18 19 20#if defined (__cplusplus) 21extern "C" { 22#endif 23 24#ifndef ZSTD_BUFFERED_H_23987 25#define ZSTD_BUFFERED_H_23987 26 27/* ************************************* 28* Dependencies 29***************************************/ 30#include <stddef.h> /* size_t */ 31#include "../zstd.h" /* ZSTD_CStream, ZSTD_DStream, ZSTDLIB_API */ 32 33 34/* *************************************************************** 35* Compiler specifics 36*****************************************************************/ 37/* Deprecation warnings */ 38/* Should these warnings be a problem, 39 * it is generally possible to disable them, 40 * typically with -Wno-deprecated-declarations for gcc 41 * or _CRT_SECURE_NO_WARNINGS in Visual. 42 * Otherwise, it's also possible to define ZBUFF_DISABLE_DEPRECATE_WARNINGS 43 */ 44#ifdef ZBUFF_DISABLE_DEPRECATE_WARNINGS 45# define ZBUFF_DEPRECATED(message) ZSTDLIB_API /* disable deprecation warnings */ 46#else 47# if defined (__cplusplus) && (__cplusplus >= 201402) /* C++14 or greater */ 48# define ZBUFF_DEPRECATED(message) [[deprecated(message)]] ZSTDLIB_API 49# elif (defined(GNUC) && (GNUC > 4 || (GNUC == 4 && GNUC_MINOR >= 5))) || defined(__clang__) 50# define ZBUFF_DEPRECATED(message) ZSTDLIB_API __attribute__((deprecated(message))) 51# elif defined(__GNUC__) && (__GNUC__ >= 3) 52# define ZBUFF_DEPRECATED(message) ZSTDLIB_API __attribute__((deprecated)) 53# elif defined(_MSC_VER) 54# define ZBUFF_DEPRECATED(message) ZSTDLIB_API __declspec(deprecated(message)) 55# else 56# pragma message("WARNING: You need to implement ZBUFF_DEPRECATED for this compiler") 57# define ZBUFF_DEPRECATED(message) ZSTDLIB_API 58# endif 59#endif /* ZBUFF_DISABLE_DEPRECATE_WARNINGS */ 60 61 62/* ************************************* 63* Streaming functions 64***************************************/ 65/* This is the easier "buffered" streaming API, 66* using an internal buffer to lift all restrictions on user-provided buffers 67* which can be any size, any place, for both input and output. 68* ZBUFF and ZSTD are 100% interoperable, 69* frames created by one can be decoded by the other one */ 70 71typedef ZSTD_CStream ZBUFF_CCtx; 72ZBUFF_DEPRECATED("use ZSTD_createCStream") ZBUFF_CCtx* ZBUFF_createCCtx(void); 73ZBUFF_DEPRECATED("use ZSTD_freeCStream") size_t ZBUFF_freeCCtx(ZBUFF_CCtx* cctx); 74 75ZBUFF_DEPRECATED("use ZSTD_initCStream") size_t ZBUFF_compressInit(ZBUFF_CCtx* cctx, int compressionLevel); 76ZBUFF_DEPRECATED("use ZSTD_initCStream_usingDict") size_t ZBUFF_compressInitDictionary(ZBUFF_CCtx* cctx, const void* dict, size_t dictSize, int compressionLevel); 77 78ZBUFF_DEPRECATED("use ZSTD_compressStream") size_t ZBUFF_compressContinue(ZBUFF_CCtx* cctx, void* dst, size_t* dstCapacityPtr, const void* src, size_t* srcSizePtr); 79ZBUFF_DEPRECATED("use ZSTD_flushStream") size_t ZBUFF_compressFlush(ZBUFF_CCtx* cctx, void* dst, size_t* dstCapacityPtr); 80ZBUFF_DEPRECATED("use ZSTD_endStream") size_t ZBUFF_compressEnd(ZBUFF_CCtx* cctx, void* dst, size_t* dstCapacityPtr); 81 82/*-************************************************* 83* Streaming compression - howto 84* 85* A ZBUFF_CCtx object is required to track streaming operation. 86* Use ZBUFF_createCCtx() and ZBUFF_freeCCtx() to create/release resources. 87* ZBUFF_CCtx objects can be reused multiple times. 88* 89* Start by initializing ZBUF_CCtx. 90* Use ZBUFF_compressInit() to start a new compression operation. 91* Use ZBUFF_compressInitDictionary() for a compression which requires a dictionary. 92* 93* Use ZBUFF_compressContinue() repetitively to consume input stream. 94* *srcSizePtr and *dstCapacityPtr can be any size. 95* The function will report how many bytes were read or written within *srcSizePtr and *dstCapacityPtr. 96* Note that it may not consume the entire input, in which case it's up to the caller to present again remaining data. 97* The content of `dst` will be overwritten (up to *dstCapacityPtr) at each call, so save its content if it matters or change @dst . 98* @return : a hint to preferred nb of bytes to use as input for next function call (it's just a hint, to improve latency) 99* or an error code, which can be tested using ZBUFF_isError(). 100* 101* At any moment, it's possible to flush whatever data remains within buffer, using ZBUFF_compressFlush(). 102* The nb of bytes written into `dst` will be reported into *dstCapacityPtr. 103* Note that the function cannot output more than *dstCapacityPtr, 104* therefore, some content might still be left into internal buffer if *dstCapacityPtr is too small. 105* @return : nb of bytes still present into internal buffer (0 if it's empty) 106* or an error code, which can be tested using ZBUFF_isError(). 107* 108* ZBUFF_compressEnd() instructs to finish a frame. 109* It will perform a flush and write frame epilogue. 110* The epilogue is required for decoders to consider a frame completed. 111* Similar to ZBUFF_compressFlush(), it may not be able to output the entire internal buffer content if *dstCapacityPtr is too small. 112* In which case, call again ZBUFF_compressFlush() to complete the flush. 113* @return : nb of bytes still present into internal buffer (0 if it's empty) 114* or an error code, which can be tested using ZBUFF_isError(). 115* 116* Hint : _recommended buffer_ sizes (not compulsory) : ZBUFF_recommendedCInSize() / ZBUFF_recommendedCOutSize() 117* input : ZBUFF_recommendedCInSize==128 KB block size is the internal unit, use this value to reduce intermediate stages (better latency) 118* output : ZBUFF_recommendedCOutSize==ZSTD_compressBound(128 KB) + 3 + 3 : ensures it's always possible to write/flush/end a full block. Skip some buffering. 119* By using both, it ensures that input will be entirely consumed, and output will always contain the result, reducing intermediate buffering. 120* **************************************************/ 121 122 123typedef ZSTD_DStream ZBUFF_DCtx; 124ZBUFF_DEPRECATED("use ZSTD_createDStream") ZBUFF_DCtx* ZBUFF_createDCtx(void); 125ZBUFF_DEPRECATED("use ZSTD_freeDStream") size_t ZBUFF_freeDCtx(ZBUFF_DCtx* dctx); 126 127ZBUFF_DEPRECATED("use ZSTD_initDStream") size_t ZBUFF_decompressInit(ZBUFF_DCtx* dctx); 128ZBUFF_DEPRECATED("use ZSTD_initDStream_usingDict") size_t ZBUFF_decompressInitDictionary(ZBUFF_DCtx* dctx, const void* dict, size_t dictSize); 129 130ZBUFF_DEPRECATED("use ZSTD_decompressStream") size_t ZBUFF_decompressContinue(ZBUFF_DCtx* dctx, 131 void* dst, size_t* dstCapacityPtr, 132 const void* src, size_t* srcSizePtr); 133 134/*-*************************************************************************** 135* Streaming decompression howto 136* 137* A ZBUFF_DCtx object is required to track streaming operations. 138* Use ZBUFF_createDCtx() and ZBUFF_freeDCtx() to create/release resources. 139* Use ZBUFF_decompressInit() to start a new decompression operation, 140* or ZBUFF_decompressInitDictionary() if decompression requires a dictionary. 141* Note that ZBUFF_DCtx objects can be re-init multiple times. 142* 143* Use ZBUFF_decompressContinue() repetitively to consume your input. 144* *srcSizePtr and *dstCapacityPtr can be any size. 145* The function will report how many bytes were read or written by modifying *srcSizePtr and *dstCapacityPtr. 146* Note that it may not consume the entire input, in which case it's up to the caller to present remaining input again. 147* The content of `dst` will be overwritten (up to *dstCapacityPtr) at each function call, so save its content if it matters, or change `dst`. 148* @return : 0 when a frame is completely decoded and fully flushed, 149* 1 when there is still some data left within internal buffer to flush, 150* >1 when more data is expected, with value being a suggested next input size (it's just a hint, which helps latency), 151* or an error code, which can be tested using ZBUFF_isError(). 152* 153* Hint : recommended buffer sizes (not compulsory) : ZBUFF_recommendedDInSize() and ZBUFF_recommendedDOutSize() 154* output : ZBUFF_recommendedDOutSize== 128 KB block size is the internal unit, it ensures it's always possible to write a full block when decoded. 155* input : ZBUFF_recommendedDInSize == 128KB + 3; 156* just follow indications from ZBUFF_decompressContinue() to minimize latency. It should always be <= 128 KB + 3 . 157* *******************************************************************************/ 158 159 160/* ************************************* 161* Tool functions 162***************************************/ 163ZBUFF_DEPRECATED("use ZSTD_isError") unsigned ZBUFF_isError(size_t errorCode); 164ZBUFF_DEPRECATED("use ZSTD_getErrorName") const char* ZBUFF_getErrorName(size_t errorCode); 165 166/** Functions below provide recommended buffer sizes for Compression or Decompression operations. 167* These sizes are just hints, they tend to offer better latency */ 168ZBUFF_DEPRECATED("use ZSTD_CStreamInSize") size_t ZBUFF_recommendedCInSize(void); 169ZBUFF_DEPRECATED("use ZSTD_CStreamOutSize") size_t ZBUFF_recommendedCOutSize(void); 170ZBUFF_DEPRECATED("use ZSTD_DStreamInSize") size_t ZBUFF_recommendedDInSize(void); 171ZBUFF_DEPRECATED("use ZSTD_DStreamOutSize") size_t ZBUFF_recommendedDOutSize(void); 172 173#endif /* ZSTD_BUFFERED_H_23987 */ 174 175 176#ifdef ZBUFF_STATIC_LINKING_ONLY 177#ifndef ZBUFF_STATIC_H_30298098432 178#define ZBUFF_STATIC_H_30298098432 179 180/* ==================================================================================== 181 * The definitions in this section are considered experimental. 182 * They should never be used in association with a dynamic library, as they may change in the future. 183 * They are provided for advanced usages. 184 * Use them only in association with static linking. 185 * ==================================================================================== */ 186 187/*--- Dependency ---*/ 188#define ZSTD_STATIC_LINKING_ONLY /* ZSTD_parameters, ZSTD_customMem */ 189#include "../zstd.h" 190 191 192/*--- Custom memory allocator ---*/ 193/*! ZBUFF_createCCtx_advanced() : 194 * Create a ZBUFF compression context using external alloc and free functions */ 195ZBUFF_DEPRECATED("use ZSTD_createCStream_advanced") ZBUFF_CCtx* ZBUFF_createCCtx_advanced(ZSTD_customMem customMem); 196 197/*! ZBUFF_createDCtx_advanced() : 198 * Create a ZBUFF decompression context using external alloc and free functions */ 199ZBUFF_DEPRECATED("use ZSTD_createDStream_advanced") ZBUFF_DCtx* ZBUFF_createDCtx_advanced(ZSTD_customMem customMem); 200 201 202/*--- Advanced Streaming Initialization ---*/ 203ZBUFF_DEPRECATED("use ZSTD_initDStream_usingDict") size_t ZBUFF_compressInit_advanced(ZBUFF_CCtx* zbc, 204 const void* dict, size_t dictSize, 205 ZSTD_parameters params, unsigned long long pledgedSrcSize); 206 207 208#endif /* ZBUFF_STATIC_H_30298098432 */ 209#endif /* ZBUFF_STATIC_LINKING_ONLY */ 210 211 212#if defined (__cplusplus) 213} 214#endif 215