shithub: jbig2

ref: 678523a15572456b68612fafc422d4dee29ca59c
dir: /jbig2_hufftab.h/

/*
    jbig2dec
    
    Copyright (c) 2001 artofcode LLC.
    
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.
    
    $Id: jbig2_hufftab.h,v 1.1 2001/06/26 00:30:00 giles Exp $
*/

/* predefined Huffman table definitions 
    -- See Annex B of the JBIG2 draft spec */

#ifndef JBIG2_HUFFTAB_H
#define JBIG2_HUFFTAB_H

typedef struct _Jbig2HuffmanEntry Jbig2HuffmanEntry;
typedef struct _Jbig2HuffmanState Jbig2HuffmanState;
typedef struct _Jbig2HuffmanTable Jbig2HuffmanTable;
typedef struct _Jbig2HuffmanParams Jbig2HuffmanParams;

struct _Jbig2HuffmanEntry {
  union {
    int32 RANGELOW;
    Jbig2HuffmanTable *ext_table;
  } u;
  byte PREFLEN;
  byte RANGELEN;
  byte flags;
};

struct _Jbig2HuffmanTable {
  int log_table_size;
  Jbig2HuffmanEntry *entries;
};

typedef struct _Jbig2HuffmanLine Jbig2HuffmanLine;

struct _Jbig2HuffmanLine {
  int PREFLEN;
  int RANGELEN;
  int RANGELOW;
};

struct _Jbig2HuffmanParams {
  bool HTOOB;
  int n_lines;
  const Jbig2HuffmanLine *lines;
};

/* Table B.1 */
const Jbig2HuffmanLine
jbig_huffman_lines_A[] = {
  { 1, 4, 0 },
  { 2, 8, 16 },
  { 3, 16, 272 },
  { 0, 32, -1 },   /* low */
  { 3, 32, 65808 } /* high */
};

const Jbig2HuffmanParams
jbig_huffman_params_A = { FALSE, 5, jbig_huffman_lines_A };

/* Table B.2 */
const Jbig2HuffmanLine
jbig_huffman_lines_B[] = {
  { 1, 0, 0 },
  { 2, 0, 1 },
  { 3, 0, 2 },
  { 4, 3, 3 },
  { 5, 6, 11 },
  { 0, 32, -1 }, /* low */
  { 6, 32, 75 }, /* high */
  { 6, 0, 0 }
};

const Jbig2HuffmanParams
jbig_huffman_params_B = { TRUE, 8, jbig_huffman_lines_B };

/* Table B.3 */
const Jbig2HuffmanLine
jbig_huffman_lines_C[] = {
  { 8, 8, -256 },
  { 1, 0, 0 },
  { 2, 0, 1 },
  { 3, 0, 2 },
  { 4, 3, 3 },
  { 5, 6, 11 },
  { 8, 32, -257 }, /* low */
  { 7, 32, 75 },   /* high */
  { 6, 0, 0 } /* OOB */
};

const Jbig2HuffmanParams
jbig_huffman_params_C = { TRUE, 9, jbig_huffman_lines_C };

/* Table B.4 */
const Jbig2HuffmanLine
jbig_huffman_lines_D[] = {
  { 1, 0, 1 },
  { 2, 0, 2 },
  { 3, 0, 3 },
  { 4, 3, 4 },
  { 5, 6, 12 },
  { 0, 32, -1 }, /* low */
  { 5, 32, 76 }, /* high */
};

const Jbig2HuffmanParams
jbig_huffman_params_D = { FALSE, 7, jbig_huffman_lines_D };

/* Table B.14 */
const Jbig2HuffmanLine
jbig_huffman_lines_N[] = {
  { 3, 0, -2 },
  { 3, 0, -1 },
  { 1, 0, 0 },
  { 3, 3, 1 },
  { 3, 6, 2 },
  { 0, 32, -1 }, /* low */
  { 0, 32, 3 }, /* high */
};

const Jbig2HuffmanParams
jbig_huffman_params_N = { FALSE, 7, jbig_huffman_lines_N };


#endif /* JBIG2_HUFFTAB_H */