1 /*
2  * Copyright (c) 2016-2020, 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 
13 /* *************************************
14 *  Dependencies
15 ***************************************/
16 #define ZBUFF_STATIC_LINKING_ONLY
17 #include "zbuff.h"
18 
19 
ZBUFF_createDCtx(void)20 ZBUFF_DCtx* ZBUFF_createDCtx(void)
21 {
22     return ZSTD_createDStream();
23 }
24 
ZBUFF_createDCtx_advanced(ZSTD_customMem customMem)25 ZBUFF_DCtx* ZBUFF_createDCtx_advanced(ZSTD_customMem customMem)
26 {
27     return ZSTD_createDStream_advanced(customMem);
28 }
29 
ZBUFF_freeDCtx(ZBUFF_DCtx * zbd)30 size_t ZBUFF_freeDCtx(ZBUFF_DCtx* zbd)
31 {
32     return ZSTD_freeDStream(zbd);
33 }
34 
35 
36 /* *** Initialization *** */
37 
ZBUFF_decompressInitDictionary(ZBUFF_DCtx * zbd,const void * dict,size_t dictSize)38 size_t ZBUFF_decompressInitDictionary(ZBUFF_DCtx* zbd, const void* dict, size_t dictSize)
39 {
40     return ZSTD_initDStream_usingDict(zbd, dict, dictSize);
41 }
42 
ZBUFF_decompressInit(ZBUFF_DCtx * zbd)43 size_t ZBUFF_decompressInit(ZBUFF_DCtx* zbd)
44 {
45     return ZSTD_initDStream(zbd);
46 }
47 
48 
49 /* *** Decompression *** */
50 
ZBUFF_decompressContinue(ZBUFF_DCtx * zbd,void * dst,size_t * dstCapacityPtr,const void * src,size_t * srcSizePtr)51 size_t ZBUFF_decompressContinue(ZBUFF_DCtx* zbd,
52                                 void* dst, size_t* dstCapacityPtr,
53                           const void* src, size_t* srcSizePtr)
54 {
55     ZSTD_outBuffer outBuff;
56     ZSTD_inBuffer inBuff;
57     size_t result;
58     outBuff.dst  = dst;
59     outBuff.pos  = 0;
60     outBuff.size = *dstCapacityPtr;
61     inBuff.src  = src;
62     inBuff.pos  = 0;
63     inBuff.size = *srcSizePtr;
64     result = ZSTD_decompressStream(zbd, &outBuff, &inBuff);
65     *dstCapacityPtr = outBuff.pos;
66     *srcSizePtr = inBuff.pos;
67     return result;
68 }
69 
70 
71 /* *************************************
72 *  Tool functions
73 ***************************************/
ZBUFF_recommendedDInSize(void)74 size_t ZBUFF_recommendedDInSize(void)  { return ZSTD_DStreamInSize(); }
ZBUFF_recommendedDOutSize(void)75 size_t ZBUFF_recommendedDOutSize(void) { return ZSTD_DStreamOutSize(); }
76