Mercurial > hgrepos > Python2 > PyMuPDF

comparison mupdf-source/thirdparty/jbig2dec/jbig2_huffman.h @ 2:b50eed0cc0ef upstream

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
parents
children
comparison
equal deleted inserted replaced
1:1d09e1dec1d9 2:b50eed0cc0ef
1 /* Copyright (C) 2001-2023 Artifex Software, Inc.
2 All Rights Reserved.
3
4 This software is provided AS-IS with no warranty, either express or
5 implied.
6
7 This software is distributed under license and may not be copied,
8 modified or distributed except as expressly authorized under the terms
9 of the license contained in the file LICENSE in this distribution.
10
11 Refer to licensing information at http://www.artifex.com or contact
12 Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
13 CA 94129, USA, for further information.
14 */
15
16 /*
17 jbig2dec
18 */
19
20 #ifndef _JBIG2_HUFFMAN_H
21 #define _JBIG2_HUFFMAN_H
22
23 /* Huffman coder interface */
24
25 typedef struct _Jbig2HuffmanEntry Jbig2HuffmanEntry;
26 typedef struct _Jbig2HuffmanState Jbig2HuffmanState;
27 typedef struct _Jbig2HuffmanTable Jbig2HuffmanTable;
28 typedef struct _Jbig2HuffmanParams Jbig2HuffmanParams;
29
30 struct _Jbig2HuffmanEntry {
31 union {
32 int32_t RANGELOW;
33 Jbig2HuffmanTable *ext_table;
34 } u;
35 byte PREFLEN;
36 byte RANGELEN;
37 byte flags;
38 };
39
40 struct _Jbig2HuffmanTable {
41 int log_table_size;
42 Jbig2HuffmanEntry *entries;
43 };
44
45 typedef struct _Jbig2HuffmanLine Jbig2HuffmanLine;
46
47 struct _Jbig2HuffmanLine {
48 int PREFLEN;
49 int RANGELEN;
50 int RANGELOW;
51 };
52
53 struct _Jbig2HuffmanParams {
54 bool HTOOB;
55 int n_lines;
56 const Jbig2HuffmanLine *lines;
57 };
58
59 Jbig2HuffmanState *jbig2_huffman_new(Jbig2Ctx *ctx, Jbig2WordStream *ws);
60
61 void jbig2_huffman_free(Jbig2Ctx *ctx, Jbig2HuffmanState *hs);
62
63 int jbig2_huffman_skip(Jbig2HuffmanState *hs);
64
65 int jbig2_huffman_advance(Jbig2HuffmanState *hs, size_t advance);
66
67 uint32_t jbig2_huffman_offset(Jbig2HuffmanState *hs);
68
69 int32_t jbig2_huffman_get(Jbig2HuffmanState *hs, const Jbig2HuffmanTable *table, bool *oob);
70
71 int32_t jbig2_huffman_get_bits(Jbig2HuffmanState *hs, const int bits, int *err);
72
73 #ifdef JBIG2_DEBUG
74 void jbig2_dump_huffman_state(Jbig2HuffmanState *hs);
75 void jbig2_dump_huffman_binary(Jbig2HuffmanState *hs);
76 #endif
77
78 Jbig2HuffmanTable *jbig2_build_huffman_table(Jbig2Ctx *ctx, const Jbig2HuffmanParams *params);
79
80 void jbig2_release_huffman_table(Jbig2Ctx *ctx, Jbig2HuffmanTable *table);
81
82 /* standard Huffman templates defined by the specification */
83 extern const Jbig2HuffmanParams jbig2_huffman_params_A; /* Table B.1 */
84 extern const Jbig2HuffmanParams jbig2_huffman_params_B; /* Table B.2 */
85 extern const Jbig2HuffmanParams jbig2_huffman_params_C; /* Table B.3 */
86 extern const Jbig2HuffmanParams jbig2_huffman_params_D; /* Table B.4 */
87 extern const Jbig2HuffmanParams jbig2_huffman_params_E; /* Table B.5 */
88 extern const Jbig2HuffmanParams jbig2_huffman_params_F; /* Table B.6 */
89 extern const Jbig2HuffmanParams jbig2_huffman_params_G; /* Table B.7 */
90 extern const Jbig2HuffmanParams jbig2_huffman_params_H; /* Table B.8 */
91 extern const Jbig2HuffmanParams jbig2_huffman_params_I; /* Table B.9 */
92 extern const Jbig2HuffmanParams jbig2_huffman_params_J; /* Table B.10 */
93 extern const Jbig2HuffmanParams jbig2_huffman_params_K; /* Table B.11 */
94 extern const Jbig2HuffmanParams jbig2_huffman_params_L; /* Table B.12 */
95 extern const Jbig2HuffmanParams jbig2_huffman_params_M; /* Table B.13 */
96 extern const Jbig2HuffmanParams jbig2_huffman_params_N; /* Table B.14 */
97 extern const Jbig2HuffmanParams jbig2_huffman_params_O; /* Table B.15 */
98
99 /* Routines to handle "code table segment (53)" */
100
101 /* Parse a code table segment, store Jbig2HuffmanParams in segment->result */
102 int jbig2_table(Jbig2Ctx *ctx, Jbig2Segment *segment, const byte *segment_data);
103
104 /* free Jbig2HuffmanParams allocated by jbig2_huffman_table() */
105 void jbig2_table_free(Jbig2Ctx *ctx, Jbig2HuffmanParams *params);
106
107 /* find a user supplied table used by 'segment' and by 'index' */
108 const Jbig2HuffmanParams *jbig2_find_table(Jbig2Ctx *ctx, Jbig2Segment *segment, int index);
109
110 #endif /* _JBIG2_HUFFMAN_H */