111 lines
3.8 KiB
C
111 lines
3.8 KiB
C
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/* Copyright (C) 2001-2019 Artifex Software, Inc.
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All Rights Reserved.
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This software is provided AS-IS with no warranty, either express or
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implied.
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This software is distributed under license and may not be copied,
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modified or distributed except as expressly authorized under the terms
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of the license contained in the file LICENSE in this distribution.
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Refer to licensing information at http://www.artifex.com or contact
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Artifex Software, Inc., 1305 Grant Avenue - Suite 200, Novato,
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CA 94945, U.S.A., +1(415)492-9861, for further information.
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*/
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/*
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jbig2dec
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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 *jbig2_huffman_new(Jbig2Ctx *ctx, Jbig2WordStream *ws);
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void jbig2_huffman_free(Jbig2Ctx *ctx, Jbig2HuffmanState *hs);
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int jbig2_huffman_skip(Jbig2HuffmanState *hs);
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int jbig2_huffman_advance(Jbig2HuffmanState *hs, size_t advance);
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uint32_t jbig2_huffman_offset(Jbig2HuffmanState *hs);
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int32_t jbig2_huffman_get(Jbig2HuffmanState *hs, const Jbig2HuffmanTable *table, bool *oob);
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int32_t jbig2_huffman_get_bits(Jbig2HuffmanState *hs, const int bits, int *err);
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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 *jbig2_build_huffman_table(Jbig2Ctx *ctx, const Jbig2HuffmanParams *params);
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void 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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/* Routines to handle "code table segment (53)" */
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/* Parse a code table segment, store Jbig2HuffmanParams in segment->result */
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int jbig2_table(Jbig2Ctx *ctx, Jbig2Segment *segment, const byte *segment_data);
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/* free Jbig2HuffmanParams allocated by jbig2_huffman_table() */
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void jbig2_table_free(Jbig2Ctx *ctx, Jbig2HuffmanParams *params);
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/* find a user supplied table used by 'segment' and by 'index' */
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const Jbig2HuffmanParams *jbig2_find_table(Jbig2Ctx *ctx, Jbig2Segment *segment, int index);
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#endif /* _JBIG2_HUFFMAN_H */
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