ceph/src/zstd/lib/decompress/zstd_decompress_block.h

   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 #ifndef ZSTD_DEC_BLOCK_H
  13 #define ZSTD_DEC_BLOCK_H
  14
  15 /*-*******************************************************
  16  *  Dependencies
  17  *********************************************************/
  18 #include <stddef.h>   /* size_t */
  19 #include "../zstd.h"    /* DCtx, and some public functions */
  20 #include "../common/zstd_internal.h"  /* blockProperties_t, and some public functions */
  21 #include "zstd_decompress_internal.h"  /* ZSTD_seqSymbol */
  22
  23
  24 /* ===   Prototypes   === */
  25
  26 /* note: prototypes already published within `zstd.h` :
  27  * ZSTD_decompressBlock()
  28  */
  29
  30 /* note: prototypes already published within `zstd_internal.h` :
  31  * ZSTD_getcBlockSize()
  32  * ZSTD_decodeSeqHeaders()
  33  */
  34
  35
  36 /* ZSTD_decompressBlock_internal() :
  37  * decompress block, starting at `src`,
  38  * into destination buffer `dst`.
  39  * @return : decompressed block size,
  40  *           or an error code (which can be tested using ZSTD_isError())
  41  */
  42 size_t ZSTD_decompressBlock_internal(ZSTD_DCtx* dctx,
  43                                void* dst, size_t dstCapacity,
  44                          const void* src, size_t srcSize, const int frame);
  45
  46 /* ZSTD_buildFSETable() :
  47  * generate FSE decoding table for one symbol (ll, ml or off)
  48  * this function must be called with valid parameters only
  49  * (dt is large enough, normalizedCounter distribution total is a power of 2, max is within range, etc.)
  50  * in which case it cannot fail.
  51  * Internal use only.
  52  */
  53 void ZSTD_buildFSETable(ZSTD_seqSymbol* dt,
  54              const short* normalizedCounter, unsigned maxSymbolValue,
  55              const U32* baseValue, const U32* nbAdditionalBits,
  56                    unsigned tableLog);
  57
  58
  59 #endif /* ZSTD_DEC_BLOCK_H */