sys/contrib/zstd/lib/deprecated/zbuff_decompress.c

   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
  13 /* *************************************
  14 *  Dependencies
  15 ***************************************/
  16 #define ZBUFF_STATIC_LINKING_ONLY
  17 #include "zbuff.h"
  18
  19
  20 ZBUFF_DCtx* ZBUFF_createDCtx(void)
  21 {
  22     return ZSTD_createDStream();
  23 }
  24
  25 ZBUFF_DCtx* ZBUFF_createDCtx_advanced(ZSTD_customMem customMem)
  26 {
  27     return ZSTD_createDStream_advanced(customMem);
  28 }
  29
  30 size_t ZBUFF_freeDCtx(ZBUFF_DCtx* zbd)
  31 {
  32     return ZSTD_freeDStream(zbd);
  33 }
  34
  35
  36 /* *** Initialization *** */
  37
  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
  43 size_t ZBUFF_decompressInit(ZBUFF_DCtx* zbd)
  44 {
  45     return ZSTD_initDStream(zbd);
  46 }
  47
  48
  49 /* *** Decompression *** */
  50
  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 ***************************************/
  74 size_t ZBUFF_recommendedDInSize(void)  { return ZSTD_DStreamInSize(); }
  75 size_t ZBUFF_recommendedDOutSize(void) { return ZSTD_DStreamOutSize(); }