Mercurial > hgrepos > Python2 > PyMuPDF

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
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1 /* Copyright (C) 2001-2023 Artifex Software, Inc.
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2 All Rights Reserved.
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4 This software is provided AS-IS with no warranty, either express or
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5 implied.
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7 This software is distributed under license and may not be copied,
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8 modified or distributed except as expressly authorized under the terms
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9 of the license contained in the file LICENSE in this distribution.
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11 Refer to licensing information at http://www.artifex.com or contact
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12 Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
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13 CA 94129, USA, for further information.
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14 */
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16 /*
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17 jbig2dec
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18 */
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20 #ifndef _JBIG2_HUFFMAN_H
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21 #define _JBIG2_HUFFMAN_H
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23 /* Huffman coder interface */
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25 typedef struct _Jbig2HuffmanEntry Jbig2HuffmanEntry;
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26 typedef struct _Jbig2HuffmanState Jbig2HuffmanState;
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27 typedef struct _Jbig2HuffmanTable Jbig2HuffmanTable;
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28 typedef struct _Jbig2HuffmanParams Jbig2HuffmanParams;
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30 struct _Jbig2HuffmanEntry {
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31 union {
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32 int32_t RANGELOW;
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33 Jbig2HuffmanTable *ext_table;
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34 } u;
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35 byte PREFLEN;
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36 byte RANGELEN;
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37 byte flags;
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38 };
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40 struct _Jbig2HuffmanTable {
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41 int log_table_size;
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42 Jbig2HuffmanEntry *entries;
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43 };
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45 typedef struct _Jbig2HuffmanLine Jbig2HuffmanLine;
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47 struct _Jbig2HuffmanLine {
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48 int PREFLEN;
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49 int RANGELEN;
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50 int RANGELOW;
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51 };
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53 struct _Jbig2HuffmanParams {
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54 bool HTOOB;
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55 int n_lines;
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56 const Jbig2HuffmanLine *lines;
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57 };
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59 Jbig2HuffmanState *jbig2_huffman_new(Jbig2Ctx *ctx, Jbig2WordStream *ws);
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61 void jbig2_huffman_free(Jbig2Ctx *ctx, Jbig2HuffmanState *hs);
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63 int jbig2_huffman_skip(Jbig2HuffmanState *hs);
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65 int jbig2_huffman_advance(Jbig2HuffmanState *hs, size_t advance);
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67 uint32_t jbig2_huffman_offset(Jbig2HuffmanState *hs);
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69 int32_t jbig2_huffman_get(Jbig2HuffmanState *hs, const Jbig2HuffmanTable *table, bool *oob);
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71 int32_t jbig2_huffman_get_bits(Jbig2HuffmanState *hs, const int bits, int *err);
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73 #ifdef JBIG2_DEBUG
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74 void jbig2_dump_huffman_state(Jbig2HuffmanState *hs);
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75 void jbig2_dump_huffman_binary(Jbig2HuffmanState *hs);
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76 #endif
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78 Jbig2HuffmanTable *jbig2_build_huffman_table(Jbig2Ctx *ctx, const Jbig2HuffmanParams *params);
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80 void jbig2_release_huffman_table(Jbig2Ctx *ctx, Jbig2HuffmanTable *table);
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82 /* standard Huffman templates defined by the specification */
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83 extern const Jbig2HuffmanParams jbig2_huffman_params_A; /* Table B.1 */
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84 extern const Jbig2HuffmanParams jbig2_huffman_params_B; /* Table B.2 */
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85 extern const Jbig2HuffmanParams jbig2_huffman_params_C; /* Table B.3 */
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86 extern const Jbig2HuffmanParams jbig2_huffman_params_D; /* Table B.4 */
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87 extern const Jbig2HuffmanParams jbig2_huffman_params_E; /* Table B.5 */
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88 extern const Jbig2HuffmanParams jbig2_huffman_params_F; /* Table B.6 */
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89 extern const Jbig2HuffmanParams jbig2_huffman_params_G; /* Table B.7 */
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90 extern const Jbig2HuffmanParams jbig2_huffman_params_H; /* Table B.8 */
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91 extern const Jbig2HuffmanParams jbig2_huffman_params_I; /* Table B.9 */
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92 extern const Jbig2HuffmanParams jbig2_huffman_params_J; /* Table B.10 */
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93 extern const Jbig2HuffmanParams jbig2_huffman_params_K; /* Table B.11 */
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94 extern const Jbig2HuffmanParams jbig2_huffman_params_L; /* Table B.12 */
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95 extern const Jbig2HuffmanParams jbig2_huffman_params_M; /* Table B.13 */
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96 extern const Jbig2HuffmanParams jbig2_huffman_params_N; /* Table B.14 */
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97 extern const Jbig2HuffmanParams jbig2_huffman_params_O; /* Table B.15 */
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98
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99 /* Routines to handle "code table segment (53)" */
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100
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101 /* Parse a code table segment, store Jbig2HuffmanParams in segment->result */
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102 int jbig2_table(Jbig2Ctx *ctx, Jbig2Segment *segment, const byte *segment_data);
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103
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104 /* free Jbig2HuffmanParams allocated by jbig2_huffman_table() */
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105 void jbig2_table_free(Jbig2Ctx *ctx, Jbig2HuffmanParams *params);
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106
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107 /* find a user supplied table used by 'segment' and by 'index' */
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108 const Jbig2HuffmanParams *jbig2_find_table(Jbig2Ctx *ctx, Jbig2Segment *segment, int index);
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109
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110 #endif /* _JBIG2_HUFFMAN_H */