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 "../common/zstd_deps.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  * The workspace must be 4-byte aligned and at least ZSTD_BUILD_FSE_TABLE_WKSP_SIZE bytes, which is
52  * defined in zstd_decompress_internal.h.
53  * Internal use only.
54  */
55 void ZSTD_buildFSETable(ZSTD_seqSymbol* dt,
56              const short* normalizedCounter, unsigned maxSymbolValue,
57              const U32* baseValue, const U32* nbAdditionalBits,
58                    unsigned tableLog, void* wksp, size_t wkspSize,
59                    int bmi2);
60 
61 
62 #endif /* ZSTD_DEC_BLOCK_H */
63