106 lines
3.1 KiB
C
106 lines
3.1 KiB
C
/*
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jbig2dec
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Copyright (C) 2001-2005 Artifex Software, Inc.
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This software is distributed under license and may not
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be copied, modified or distributed except as expressly
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authorized under the terms of the license contained in
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the file LICENSE in this distribution.
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For further licensing information refer to http://artifex.com/ or
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contact Artifex Software, Inc., 7 Mt. Lassen Drive - Suite A-134,
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San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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*/
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#ifndef JBIG2_HUFFMAN_H
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#define JBIG2_HUFFMAN_H
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/* Huffman coder interface */
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typedef struct _Jbig2HuffmanEntry Jbig2HuffmanEntry;
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typedef struct _Jbig2HuffmanState Jbig2HuffmanState;
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typedef struct _Jbig2HuffmanTable Jbig2HuffmanTable;
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typedef struct _Jbig2HuffmanParams Jbig2HuffmanParams;
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struct _Jbig2HuffmanEntry {
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union {
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int32_t RANGELOW;
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Jbig2HuffmanTable *ext_table;
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} u;
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byte PREFLEN;
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byte RANGELEN;
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byte flags;
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};
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struct _Jbig2HuffmanTable {
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int log_table_size;
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Jbig2HuffmanEntry *entries;
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};
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typedef struct _Jbig2HuffmanLine Jbig2HuffmanLine;
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struct _Jbig2HuffmanLine {
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int PREFLEN;
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int RANGELEN;
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int RANGELOW;
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};
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struct _Jbig2HuffmanParams {
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bool HTOOB;
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int n_lines;
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const Jbig2HuffmanLine *lines;
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};
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Jbig2HuffmanState *
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jbig2_huffman_new (Jbig2Ctx *ctx, Jbig2WordStream *ws);
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void
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jbig2_huffman_free (Jbig2Ctx *ctx, Jbig2HuffmanState *hs);
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void
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jbig2_huffman_skip(Jbig2HuffmanState *hs);
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void jbig2_huffman_advance(Jbig2HuffmanState *hs, int offset);
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int
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jbig2_huffman_offset(Jbig2HuffmanState *hs);
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int32_t
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jbig2_huffman_get (Jbig2HuffmanState *hs,
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const Jbig2HuffmanTable *table, bool *oob);
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int32_t
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jbig2_huffman_get_bits (Jbig2HuffmanState *hs, const int bits);
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#ifdef JBIG2_DEBUG
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void jbig2_dump_huffman_state(Jbig2HuffmanState *hs);
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void jbig2_dump_huffman_binary(Jbig2HuffmanState *hs);
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#endif
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Jbig2HuffmanTable *
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jbig2_build_huffman_table (Jbig2Ctx *ctx, const Jbig2HuffmanParams *params);
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void
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jbig2_release_huffman_table (Jbig2Ctx *ctx, Jbig2HuffmanTable *table);
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/* standard Huffman templates defined by the specification */
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extern const Jbig2HuffmanParams jbig2_huffman_params_A; /* Table B.1 */
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extern const Jbig2HuffmanParams jbig2_huffman_params_B; /* Table B.2 */
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extern const Jbig2HuffmanParams jbig2_huffman_params_C; /* Table B.3 */
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extern const Jbig2HuffmanParams jbig2_huffman_params_D; /* Table B.4 */
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extern const Jbig2HuffmanParams jbig2_huffman_params_E; /* Table B.5 */
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extern const Jbig2HuffmanParams jbig2_huffman_params_F; /* Table B.6 */
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extern const Jbig2HuffmanParams jbig2_huffman_params_G; /* Table B.7 */
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extern const Jbig2HuffmanParams jbig2_huffman_params_H; /* Table B.8 */
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extern const Jbig2HuffmanParams jbig2_huffman_params_I; /* Table B.9 */
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extern const Jbig2HuffmanParams jbig2_huffman_params_J; /* Table B.10 */
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extern const Jbig2HuffmanParams jbig2_huffman_params_K; /* Table B.11 */
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extern const Jbig2HuffmanParams jbig2_huffman_params_L; /* Table B.12 */
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extern const Jbig2HuffmanParams jbig2_huffman_params_M; /* Table B.13 */
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extern const Jbig2HuffmanParams jbig2_huffman_params_N; /* Table B.14 */
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extern const Jbig2HuffmanParams jbig2_huffman_params_O; /* Table B.15 */
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#endif /* JBIG2_HUFFMAN_H */
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