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| 4680 | right-hear | 1 | /* |
| 2 | jbig2dec |
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| 3 | |||
| 4 | Copyright (C) 2001-2005 Artifex Software, Inc. |
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| 5 | |||
| 6 | This software is distributed under license and may not |
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| 7 | be copied, modified or distributed except as expressly |
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| 8 | authorized under the terms of the license contained in |
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| 9 | the file LICENSE in this distribution. |
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| 10 | |||
| 11 | For further licensing information refer to http://artifex.com/ or |
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| 12 | contact Artifex Software, Inc., 7 Mt. Lassen Drive - Suite A-134, |
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| 13 | San Rafael, CA 94903, U.S.A., +1(415)492-9861. |
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| 14 | */ |
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| 15 | |||
| 16 | #ifndef JBIG2_HUFFMAN_H |
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| 17 | #define JBIG2_HUFFMAN_H |
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| 18 | |||
| 19 | /* Huffman coder interface */ |
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| 20 | |||
| 21 | typedef struct _Jbig2HuffmanEntry Jbig2HuffmanEntry; |
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| 22 | typedef struct _Jbig2HuffmanState Jbig2HuffmanState; |
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| 23 | typedef struct _Jbig2HuffmanTable Jbig2HuffmanTable; |
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| 24 | typedef struct _Jbig2HuffmanParams Jbig2HuffmanParams; |
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| 25 | |||
| 26 | struct _Jbig2HuffmanEntry { |
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| 27 | union { |
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| 28 | int32_t RANGELOW; |
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| 29 | Jbig2HuffmanTable *ext_table; |
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| 30 | } u; |
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| 31 | byte PREFLEN; |
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| 32 | byte RANGELEN; |
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| 33 | byte flags; |
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| 34 | }; |
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| 35 | |||
| 36 | struct _Jbig2HuffmanTable { |
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| 37 | int log_table_size; |
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| 38 | Jbig2HuffmanEntry *entries; |
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| 39 | }; |
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| 40 | |||
| 41 | typedef struct _Jbig2HuffmanLine Jbig2HuffmanLine; |
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| 42 | |||
| 43 | struct _Jbig2HuffmanLine { |
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| 44 | int PREFLEN; |
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| 45 | int RANGELEN; |
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| 46 | int RANGELOW; |
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| 47 | }; |
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| 48 | |||
| 49 | struct _Jbig2HuffmanParams { |
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| 50 | bool HTOOB; |
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| 51 | int n_lines; |
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| 52 | const Jbig2HuffmanLine *lines; |
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| 53 | }; |
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| 54 | |||
| 55 | Jbig2HuffmanState * |
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| 56 | jbig2_huffman_new (Jbig2Ctx *ctx, Jbig2WordStream *ws); |
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| 57 | |||
| 58 | void |
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| 59 | jbig2_huffman_free (Jbig2Ctx *ctx, Jbig2HuffmanState *hs); |
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| 60 | |||
| 61 | void |
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| 62 | jbig2_huffman_skip(Jbig2HuffmanState *hs); |
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| 63 | |||
| 64 | void jbig2_huffman_advance(Jbig2HuffmanState *hs, int offset); |
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| 65 | |||
| 66 | int |
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| 67 | jbig2_huffman_offset(Jbig2HuffmanState *hs); |
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| 68 | |||
| 69 | int32_t |
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| 70 | jbig2_huffman_get (Jbig2HuffmanState *hs, |
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| 71 | const Jbig2HuffmanTable *table, bool *oob); |
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| 72 | |||
| 73 | int32_t |
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| 74 | jbig2_huffman_get_bits (Jbig2HuffmanState *hs, const int bits); |
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| 75 | |||
| 76 | #ifdef JBIG2_DEBUG |
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| 77 | void jbig2_dump_huffman_state(Jbig2HuffmanState *hs); |
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| 78 | void jbig2_dump_huffman_binary(Jbig2HuffmanState *hs); |
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| 79 | #endif |
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| 80 | |||
| 81 | Jbig2HuffmanTable * |
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| 82 | jbig2_build_huffman_table (Jbig2Ctx *ctx, const Jbig2HuffmanParams *params); |
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| 83 | |||
| 84 | void |
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| 85 | jbig2_release_huffman_table (Jbig2Ctx *ctx, Jbig2HuffmanTable *table); |
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| 86 | |||
| 87 | /* standard Huffman templates defined by the specification */ |
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| 88 | extern const Jbig2HuffmanParams jbig2_huffman_params_A; /* Table B.1 */ |
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| 89 | extern const Jbig2HuffmanParams jbig2_huffman_params_B; /* Table B.2 */ |
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| 90 | extern const Jbig2HuffmanParams jbig2_huffman_params_C; /* Table B.3 */ |
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| 91 | extern const Jbig2HuffmanParams jbig2_huffman_params_D; /* Table B.4 */ |
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| 92 | extern const Jbig2HuffmanParams jbig2_huffman_params_E; /* Table B.5 */ |
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| 93 | extern const Jbig2HuffmanParams jbig2_huffman_params_F; /* Table B.6 */ |
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| 94 | extern const Jbig2HuffmanParams jbig2_huffman_params_G; /* Table B.7 */ |
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| 95 | extern const Jbig2HuffmanParams jbig2_huffman_params_H; /* Table B.8 */ |
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| 96 | extern const Jbig2HuffmanParams jbig2_huffman_params_I; /* Table B.9 */ |
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| 97 | extern const Jbig2HuffmanParams jbig2_huffman_params_J; /* Table B.10 */ |
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| 98 | extern const Jbig2HuffmanParams jbig2_huffman_params_K; /* Table B.11 */ |
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| 99 | extern const Jbig2HuffmanParams jbig2_huffman_params_L; /* Table B.12 */ |
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| 100 | extern const Jbig2HuffmanParams jbig2_huffman_params_M; /* Table B.13 */ |
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| 101 | extern const Jbig2HuffmanParams jbig2_huffman_params_N; /* Table B.14 */ |
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| 102 | extern const Jbig2HuffmanParams jbig2_huffman_params_O; /* Table B.15 */ |
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| 103 | |||
| 104 | |||
| 105 | #endif /* JBIG2_HUFFMAN_H */ |