ceph/src/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 the BSD-style license found in the
   6  * LICENSE file in the root directory of this source tree. An additional grant
   7  * of patent rights can be found in the PATENTS file in the same directory.
   8  */
   9
  10
  11
  12 /* *************************************
  13 *  Dependencies
  14 ***************************************/
  15 #define ZBUFF_STATIC_LINKING_ONLY
  16 #include "zbuff.h"
  17
  18
  19 ZBUFF_DCtx* ZBUFF_createDCtx(void)
  20 {
  21     return ZSTD_createDStream();
  22 }
  23
  24 ZBUFF_DCtx* ZBUFF_createDCtx_advanced(ZSTD_customMem customMem)
  25 {
  26     return ZSTD_createDStream_advanced(customMem);
  27 }
  28
  29 size_t ZBUFF_freeDCtx(ZBUFF_DCtx* zbd)
  30 {
  31     return ZSTD_freeDStream(zbd);
  32 }
  33
  34
  35 /* *** Initialization *** */
  36
  37 size_t ZBUFF_decompressInitDictionary(ZBUFF_DCtx* zbd, const void* dict, size_t dictSize)
  38 {
  39     return ZSTD_initDStream_usingDict(zbd, dict, dictSize);
  40 }
  41
  42 size_t ZBUFF_decompressInit(ZBUFF_DCtx* zbd)
  43 {
  44     return ZSTD_initDStream(zbd);
  45 }
  46
  47
  48 /* *** Decompression *** */
  49
  50 size_t ZBUFF_decompressContinue(ZBUFF_DCtx* zbd,
  51                                 void* dst, size_t* dstCapacityPtr,
  52                           const void* src, size_t* srcSizePtr)
  53 {
  54     ZSTD_outBuffer outBuff;
  55     ZSTD_inBuffer inBuff;
  56     size_t result;
  57     outBuff.dst  = dst;
  58     outBuff.pos  = 0;
  59     outBuff.size = *dstCapacityPtr;
  60     inBuff.src  = src;
  61     inBuff.pos  = 0;
  62     inBuff.size = *srcSizePtr;
  63     result = ZSTD_decompressStream(zbd, &outBuff, &inBuff);
  64     *dstCapacityPtr = outBuff.pos;
  65     *srcSizePtr = inBuff.pos;
  66     return result;
  67 }
  68
  69
  70 /* *************************************
  71 *  Tool functions
  72 ***************************************/
  73 size_t ZBUFF_recommendedDInSize(void)  { return ZSTD_DStreamInSize(); }
  74 size_t ZBUFF_recommendedDOutSize(void) { return ZSTD_DStreamOutSize(); }