1 /*
2 * Copyright (c) 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 #ifndef ZSTD_COMPRESS_SEQUENCES_H
12 #define ZSTD_COMPRESS_SEQUENCES_H
13
14 #include "../common/fse.h" /* FSE_repeat, FSE_CTable */
15 #include "../common/zstd_internal.h" /* symbolEncodingType_e, ZSTD_strategy */
16
17 typedef enum {
18 ZSTD_defaultDisallowed = 0,
19 ZSTD_defaultAllowed = 1
20 } ZSTD_defaultPolicy_e;
21
22 symbolEncodingType_e
23 ZSTD_selectEncodingType(
24 FSE_repeat* repeatMode, unsigned const* count, unsigned const max,
25 size_t const mostFrequent, size_t nbSeq, unsigned const FSELog,
26 FSE_CTable const* prevCTable,
27 short const* defaultNorm, U32 defaultNormLog,
28 ZSTD_defaultPolicy_e const isDefaultAllowed,
29 ZSTD_strategy const strategy);
30
31 size_t
32 ZSTD_buildCTable(void* dst, size_t dstCapacity,
33 FSE_CTable* nextCTable, U32 FSELog, symbolEncodingType_e type,
34 unsigned* count, U32 max,
35 const BYTE* codeTable, size_t nbSeq,
36 const S16* defaultNorm, U32 defaultNormLog, U32 defaultMax,
37 const FSE_CTable* prevCTable, size_t prevCTableSize,
38 void* entropyWorkspace, size_t entropyWorkspaceSize);
39
40 size_t ZSTD_encodeSequences(
41 void* dst, size_t dstCapacity,
42 FSE_CTable const* CTable_MatchLength, BYTE const* mlCodeTable,
43 FSE_CTable const* CTable_OffsetBits, BYTE const* ofCodeTable,
44 FSE_CTable const* CTable_LitLength, BYTE const* llCodeTable,
45 seqDef const* sequences, size_t nbSeq, int longOffsets, int bmi2);
46
47 size_t ZSTD_fseBitCost(
48 FSE_CTable const* ctable,
49 unsigned const* count,
50 unsigned const max);
51
52 size_t ZSTD_crossEntropyCost(short const* norm, unsigned accuracyLog,
53 unsigned const* count, unsigned const max);
54 #endif /* ZSTD_COMPRESS_SEQUENCES_H */
55
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