1/*
2 * Copyright (c) 2016-present, 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#ifdef ZBUFF_DISABLE_DEPRECATE_WARNINGS
44# define ZBUFF_DEPRECATED(message) ZSTDLIB_API /* disable deprecation warnings */
45#else
46# if defined (__cplusplus) && (__cplusplus >= 201402) /* C++14 or greater */
47# define ZBUFF_DEPRECATED(message) [[deprecated(message)]] ZSTDLIB_API
48# elif (defined(__GNUC__) && (__GNUC__ >= 5)) || defined(__clang__)
49# define ZBUFF_DEPRECATED(message) ZSTDLIB_API __attribute__((deprecated(message)))
50# elif defined(__GNUC__) && (__GNUC__ >= 3)
51# define ZBUFF_DEPRECATED(message) ZSTDLIB_API __attribute__((deprecated))
52# elif defined(_MSC_VER)
53# define ZBUFF_DEPRECATED(message) ZSTDLIB_API __declspec(deprecated(message))
54# else
55# pragma message("WARNING: You need to implement ZBUFF_DEPRECATED for this compiler")
56# define ZBUFF_DEPRECATED(message) ZSTDLIB_API
57# endif
58#endif /* ZBUFF_DISABLE_DEPRECATE_WARNINGS */
59
60
61/* *************************************
62* Streaming functions
63***************************************/
64/* This is the easier "buffered" streaming API,
65* using an internal buffer to lift all restrictions on user-provided buffers
66* which can be any size, any place, for both input and output.
67* ZBUFF and ZSTD are 100% interoperable,
68* frames created by one can be decoded by the other one */
69
70typedef ZSTD_CStream ZBUFF_CCtx;
71ZBUFF_DEPRECATED("use ZSTD_createCStream") ZBUFF_CCtx* ZBUFF_createCCtx(void);
72ZBUFF_DEPRECATED("use ZSTD_freeCStream") size_t ZBUFF_freeCCtx(ZBUFF_CCtx* cctx);
73
74ZBUFF_DEPRECATED("use ZSTD_initCStream") size_t ZBUFF_compressInit(ZBUFF_CCtx* cctx, int compressionLevel);
75ZBUFF_DEPRECATED("use ZSTD_initCStream_usingDict") size_t ZBUFF_compressInitDictionary(ZBUFF_CCtx* cctx, const void* dict, size_t dictSize, int compressionLevel);
76
77ZBUFF_DEPRECATED("use ZSTD_compressStream") size_t ZBUFF_compressContinue(ZBUFF_CCtx* cctx, void* dst, size_t* dstCapacityPtr, const void* src, size_t* srcSizePtr);
78ZBUFF_DEPRECATED("use ZSTD_flushStream") size_t ZBUFF_compressFlush(ZBUFF_CCtx* cctx, void* dst, size_t* dstCapacityPtr);
79ZBUFF_DEPRECATED("use ZSTD_endStream") size_t ZBUFF_compressEnd(ZBUFF_CCtx* cctx, void* dst, size_t* dstCapacityPtr);
80
81/*-*************************************************
82* Streaming compression - howto
83*
84* A ZBUFF_CCtx object is required to track streaming operation.
85* Use ZBUFF_createCCtx() and ZBUFF_freeCCtx() to create/release resources.
86* ZBUFF_CCtx objects can be reused multiple times.
87*
88* Start by initializing ZBUF_CCtx.
89* Use ZBUFF_compressInit() to start a new compression operation.
90* Use ZBUFF_compressInitDictionary() for a compression which requires a dictionary.
91*
92* Use ZBUFF_compressContinue() repetitively to consume input stream.
93* *srcSizePtr and *dstCapacityPtr can be any size.
94* The function will report how many bytes were read or written within *srcSizePtr and *dstCapacityPtr.
95* Note that it may not consume the entire input, in which case it's up to the caller to present again remaining data.
96* The content of `dst` will be overwritten (up to *dstCapacityPtr) at each call, so save its content if it matters or change @dst .
97* @return : a hint to preferred nb of bytes to use as input for next function call (it's just a hint, to improve latency)
98* or an error code, which can be tested using ZBUFF_isError().
99*
100* At any moment, it's possible to flush whatever data remains within buffer, using ZBUFF_compressFlush().
101* The nb of bytes written into `dst` will be reported into *dstCapacityPtr.
102* Note that the function cannot output more than *dstCapacityPtr,
103* therefore, some content might still be left into internal buffer if *dstCapacityPtr is too small.
104* @return : nb of bytes still present into internal buffer (0 if it's empty)
105* or an error code, which can be tested using ZBUFF_isError().
106*
107* ZBUFF_compressEnd() instructs to finish a frame.
108* It will perform a flush and write frame epilogue.
109* The epilogue is required for decoders to consider a frame completed.
110* Similar to ZBUFF_compressFlush(), it may not be able to output the entire internal buffer content if *dstCapacityPtr is too small.
111* In which case, call again ZBUFF_compressFlush() to complete the flush.
112* @return : nb of bytes still present into internal buffer (0 if it's empty)
113* or an error code, which can be tested using ZBUFF_isError().
114*
115* Hint : _recommended buffer_ sizes (not compulsory) : ZBUFF_recommendedCInSize() / ZBUFF_recommendedCOutSize()
116* input : ZBUFF_recommendedCInSize==128 KB block size is the internal unit, use this value to reduce intermediate stages (better latency)
117* output : ZBUFF_recommendedCOutSize==ZSTD_compressBound(128 KB) + 3 + 3 : ensures it's always possible to write/flush/end a full block. Skip some buffering.
118* By using both, it ensures that input will be entirely consumed, and output will always contain the result, reducing intermediate buffering.
119* **************************************************/
120
121
122typedef ZSTD_DStream ZBUFF_DCtx;
123ZBUFF_DEPRECATED("use ZSTD_createDStream") ZBUFF_DCtx* ZBUFF_createDCtx(void);
124ZBUFF_DEPRECATED("use ZSTD_freeDStream") size_t ZBUFF_freeDCtx(ZBUFF_DCtx* dctx);
125
126ZBUFF_DEPRECATED("use ZSTD_initDStream") size_t ZBUFF_decompressInit(ZBUFF_DCtx* dctx);
127ZBUFF_DEPRECATED("use ZSTD_initDStream_usingDict") size_t ZBUFF_decompressInitDictionary(ZBUFF_DCtx* dctx, const void* dict, size_t dictSize);
128
129ZBUFF_DEPRECATED("use ZSTD_decompressStream") size_t ZBUFF_decompressContinue(ZBUFF_DCtx* dctx,
130 void* dst, size_t* dstCapacityPtr,
131 const void* src, size_t* srcSizePtr);
132
133/*-***************************************************************************
134* Streaming decompression howto
135*
136* A ZBUFF_DCtx object is required to track streaming operations.
137* Use ZBUFF_createDCtx() and ZBUFF_freeDCtx() to create/release resources.
138* Use ZBUFF_decompressInit() to start a new decompression operation,
139* or ZBUFF_decompressInitDictionary() if decompression requires a dictionary.
140* Note that ZBUFF_DCtx objects can be re-init multiple times.
141*
142* Use ZBUFF_decompressContinue() repetitively to consume your input.
143* *srcSizePtr and *dstCapacityPtr can be any size.
144* The function will report how many bytes were read or written by modifying *srcSizePtr and *dstCapacityPtr.
145* Note that it may not consume the entire input, in which case it's up to the caller to present remaining input again.
146* The content of `dst` will be overwritten (up to *dstCapacityPtr) at each function call, so save its content if it matters, or change `dst`.
147* @return : 0 when a frame is completely decoded and fully flushed,
148* 1 when there is still some data left within internal buffer to flush,
149* >1 when more data is expected, with value being a suggested next input size (it's just a hint, which helps latency),
150* or an error code, which can be tested using ZBUFF_isError().
151*
152* Hint : recommended buffer sizes (not compulsory) : ZBUFF_recommendedDInSize() and ZBUFF_recommendedDOutSize()
153* output : ZBUFF_recommendedDOutSize== 128 KB block size is the internal unit, it ensures it's always possible to write a full block when decoded.
154* input : ZBUFF_recommendedDInSize == 128KB + 3;
155* just follow indications from ZBUFF_decompressContinue() to minimize latency. It should always be <= 128 KB + 3 .
156* *******************************************************************************/
157
158
159/* *************************************
160* Tool functions
161***************************************/
162ZBUFF_DEPRECATED("use ZSTD_isError") unsigned ZBUFF_isError(size_t errorCode);
163ZBUFF_DEPRECATED("use ZSTD_getErrorName") const char* ZBUFF_getErrorName(size_t errorCode);
164
165/** Functions below provide recommended buffer sizes for Compression or Decompression operations.
166* These sizes are just hints, they tend to offer better latency */
167ZBUFF_DEPRECATED("use ZSTD_CStreamInSize") size_t ZBUFF_recommendedCInSize(void);
168ZBUFF_DEPRECATED("use ZSTD_CStreamOutSize") size_t ZBUFF_recommendedCOutSize(void);
169ZBUFF_DEPRECATED("use ZSTD_DStreamInSize") size_t ZBUFF_recommendedDInSize(void);
170ZBUFF_DEPRECATED("use ZSTD_DStreamOutSize") size_t ZBUFF_recommendedDOutSize(void);
171
172#endif /* ZSTD_BUFFERED_H_23987 */
173
174
175#ifdef ZBUFF_STATIC_LINKING_ONLY
176#ifndef ZBUFF_STATIC_H_30298098432
177#define ZBUFF_STATIC_H_30298098432
178
179/* ====================================================================================
180 * The definitions in this section are considered experimental.
181 * They should never be used in association with a dynamic library, as they may change in the future.
182 * They are provided for advanced usages.
183 * Use them only in association with static linking.
184 * ==================================================================================== */
185
186/*--- Dependency ---*/
187#define ZSTD_STATIC_LINKING_ONLY /* ZSTD_parameters, ZSTD_customMem */
188#include "zstd.h"
189
190
191/*--- Custom memory allocator ---*/
192/*! ZBUFF_createCCtx_advanced() :
193 * Create a ZBUFF compression context using external alloc and free functions */
194ZBUFF_DEPRECATED("use ZSTD_createCStream_advanced") ZBUFF_CCtx* ZBUFF_createCCtx_advanced(ZSTD_customMem customMem);
195
196/*! ZBUFF_createDCtx_advanced() :
197 * Create a ZBUFF decompression context using external alloc and free functions */
198ZBUFF_DEPRECATED("use ZSTD_createDStream_advanced") ZBUFF_DCtx* ZBUFF_createDCtx_advanced(ZSTD_customMem customMem);
199
200
201/*--- Advanced Streaming Initialization ---*/
202ZBUFF_DEPRECATED("use ZSTD_initDStream_usingDict") size_t ZBUFF_compressInit_advanced(ZBUFF_CCtx* zbc,
203 const void* dict, size_t dictSize,
204 ZSTD_parameters params, unsigned long long pledgedSrcSize);
205
206
207#endif /* ZBUFF_STATIC_H_30298098432 */
208#endif /* ZBUFF_STATIC_LINKING_ONLY */
209
210
211#if defined (__cplusplus)
212}
213#endif
214