ref: 73934fd922618a011046c6fcbd844b26854b584f
dir: /jbig2_mmr.c/
/* An implementation of MMR decoding. This is based on the implementation
in Ghostscript.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "os_types.h"
#include <stddef.h>
#include <stdio.h>
#include "jbig2.h"
#include "jbig2_priv.h"
#include "jbig2_arith.h"
#include "jbig2_generic.h"
#include "jbig2_mmr.h"
typedef struct {
int width;
int height;
const byte *data;
size_t size;
int data_index;
int bit_index;
uint32_t word;
} Jbig2MmrCtx;
static void
jbig2_decode_mmr_init(Jbig2MmrCtx *mmr, int width, int height,
const byte *data, size_t size)
{
int i;
uint32_t word = 0;
mmr->width = width;
mmr->height = height;
mmr->data = data;
mmr->size = size;
mmr->data_index = 0;
mmr->bit_index = 0;
for (i = 0; i < size && i < 4; i++)
word |= (data[i] << ((3 - i) << 3));
mmr->word = word;
}
static void
jbig2_decode_mmr_consume(Jbig2MmrCtx *mmr, int n_bits)
{
mmr->word <<= n_bits;
mmr->bit_index += n_bits;
while (mmr->bit_index >= 8)
{
mmr->bit_index -= 8;
if (mmr->data_index + 4 < mmr->size)
mmr->word |= (mmr->data[mmr->data_index + 4] << mmr->bit_index);
mmr->data_index++;
}
}
typedef struct {
int val;
int n_bits;
} cfd_node;
const cfd_node cf_white_decode[] = {
{ 256, 12 },
{ 272, 12 },
{ 29, 8 },
{ 30, 8 },
{ 45, 8 },
{ 46, 8 },
{ 22, 7 },
{ 22, 7 },
{ 23, 7 },
{ 23, 7 },
{ 47, 8 },
{ 48, 8 },
{ 13, 6 },
{ 13, 6 },
{ 13, 6 },
{ 13, 6 },
{ 20, 7 },
{ 20, 7 },
{ 33, 8 },
{ 34, 8 },
{ 35, 8 },
{ 36, 8 },
{ 37, 8 },
{ 38, 8 },
{ 19, 7 },
{ 19, 7 },
{ 31, 8 },
{ 32, 8 },
{ 1, 6 },
{ 1, 6 },
{ 1, 6 },
{ 1, 6 },
{ 12, 6 },
{ 12, 6 },
{ 12, 6 },
{ 12, 6 },
{ 53, 8 },
{ 54, 8 },
{ 26, 7 },
{ 26, 7 },
{ 39, 8 },
{ 40, 8 },
{ 41, 8 },
{ 42, 8 },
{ 43, 8 },
{ 44, 8 },
{ 21, 7 },
{ 21, 7 },
{ 28, 7 },
{ 28, 7 },
{ 61, 8 },
{ 62, 8 },
{ 63, 8 },
{ 0, 8 },
{ 320, 8 },
{ 384, 8 },
{ 10, 5 },
{ 10, 5 },
{ 10, 5 },
{ 10, 5 },
{ 10, 5 },
{ 10, 5 },
{ 10, 5 },
{ 10, 5 },
{ 11, 5 },
{ 11, 5 },
{ 11, 5 },
{ 11, 5 },
{ 11, 5 },
{ 11, 5 },
{ 11, 5 },
{ 11, 5 },
{ 27, 7 },
{ 27, 7 },
{ 59, 8 },
{ 60, 8 },
{ 288, 9 },
{ 290, 9 },
{ 18, 7 },
{ 18, 7 },
{ 24, 7 },
{ 24, 7 },
{ 49, 8 },
{ 50, 8 },
{ 51, 8 },
{ 52, 8 },
{ 25, 7 },
{ 25, 7 },
{ 55, 8 },
{ 56, 8 },
{ 57, 8 },
{ 58, 8 },
{ 192, 6 },
{ 192, 6 },
{ 192, 6 },
{ 192, 6 },
{ 1664, 6 },
{ 1664, 6 },
{ 1664, 6 },
{ 1664, 6 },
{ 448, 8 },
{ 512, 8 },
{ 292, 9 },
{ 640, 8 },
{ 576, 8 },
{ 294, 9 },
{ 296, 9 },
{ 298, 9 },
{ 300, 9 },
{ 302, 9 },
{ 256, 7 },
{ 256, 7 },
{ 2, 4 },
{ 2, 4 },
{ 2, 4 },
{ 2, 4 },
{ 2, 4 },
{ 2, 4 },
{ 2, 4 },
{ 2, 4 },
{ 2, 4 },
{ 2, 4 },
{ 2, 4 },
{ 2, 4 },
{ 2, 4 },
{ 2, 4 },
{ 2, 4 },
{ 2, 4 },
{ 3, 4 },
{ 3, 4 },
{ 3, 4 },
{ 3, 4 },
{ 3, 4 },
{ 3, 4 },
{ 3, 4 },
{ 3, 4 },
{ 3, 4 },
{ 3, 4 },
{ 3, 4 },
{ 3, 4 },
{ 3, 4 },
{ 3, 4 },
{ 3, 4 },
{ 3, 4 },
{ 128, 5 },
{ 128, 5 },
{ 128, 5 },
{ 128, 5 },
{ 128, 5 },
{ 128, 5 },
{ 128, 5 },
{ 128, 5 },
{ 8, 5 },
{ 8, 5 },
{ 8, 5 },
{ 8, 5 },
{ 8, 5 },
{ 8, 5 },
{ 8, 5 },
{ 8, 5 },
{ 9, 5 },
{ 9, 5 },
{ 9, 5 },
{ 9, 5 },
{ 9, 5 },
{ 9, 5 },
{ 9, 5 },
{ 9, 5 },
{ 16, 6 },
{ 16, 6 },
{ 16, 6 },
{ 16, 6 },
{ 17, 6 },
{ 17, 6 },
{ 17, 6 },
{ 17, 6 },
{ 4, 4 },
{ 4, 4 },
{ 4, 4 },
{ 4, 4 },
{ 4, 4 },
{ 4, 4 },
{ 4, 4 },
{ 4, 4 },
{ 4, 4 },
{ 4, 4 },
{ 4, 4 },
{ 4, 4 },
{ 4, 4 },
{ 4, 4 },
{ 4, 4 },
{ 4, 4 },
{ 5, 4 },
{ 5, 4 },
{ 5, 4 },
{ 5, 4 },
{ 5, 4 },
{ 5, 4 },
{ 5, 4 },
{ 5, 4 },
{ 5, 4 },
{ 5, 4 },
{ 5, 4 },
{ 5, 4 },
{ 5, 4 },
{ 5, 4 },
{ 5, 4 },
{ 5, 4 },
{ 14, 6 },
{ 14, 6 },
{ 14, 6 },
{ 14, 6 },
{ 15, 6 },
{ 15, 6 },
{ 15, 6 },
{ 15, 6 },
{ 64, 5 },
{ 64, 5 },
{ 64, 5 },
{ 64, 5 },
{ 64, 5 },
{ 64, 5 },
{ 64, 5 },
{ 64, 5 },
{ 6, 4 },
{ 6, 4 },
{ 6, 4 },
{ 6, 4 },
{ 6, 4 },
{ 6, 4 },
{ 6, 4 },
{ 6, 4 },
{ 6, 4 },
{ 6, 4 },
{ 6, 4 },
{ 6, 4 },
{ 6, 4 },
{ 6, 4 },
{ 6, 4 },
{ 6, 4 },
{ 7, 4 },
{ 7, 4 },
{ 7, 4 },
{ 7, 4 },
{ 7, 4 },
{ 7, 4 },
{ 7, 4 },
{ 7, 4 },
{ 7, 4 },
{ 7, 4 },
{ 7, 4 },
{ 7, 4 },
{ 7, 4 },
{ 7, 4 },
{ 7, 4 },
{ 7, 4 },
{ -2, 3 },
{ -2, 3 },
{ -1, 0 },
{ -1, 0 },
{ -1, 0 },
{ -1, 0 },
{ -1, 0 },
{ -1, 0 },
{ -1, 0 },
{ -1, 0 },
{ -1, 0 },
{ -1, 0 },
{ -1, 0 },
{ -1, 0 },
{ -1, 0 },
{ -3, 4 },
{ 1792, 3 },
{ 1792, 3 },
{ 1984, 4 },
{ 2048, 4 },
{ 2112, 4 },
{ 2176, 4 },
{ 2240, 4 },
{ 2304, 4 },
{ 1856, 3 },
{ 1856, 3 },
{ 1920, 3 },
{ 1920, 3 },
{ 2368, 4 },
{ 2432, 4 },
{ 2496, 4 },
{ 2560, 4 },
{ 1472, 1 },
{ 1536, 1 },
{ 1600, 1 },
{ 1728, 1 },
{ 704, 1 },
{ 768, 1 },
{ 832, 1 },
{ 896, 1 },
{ 960, 1 },
{ 1024, 1 },
{ 1088, 1 },
{ 1152, 1 },
{ 1216, 1 },
{ 1280, 1 },
{ 1344, 1 },
{ 1408, 1 }
};
/* Black decoding table. */
const cfd_node cf_black_decode[] = {
{ 128, 12 },
{ 160, 13 },
{ 224, 12 },
{ 256, 12 },
{ 10, 7 },
{ 11, 7 },
{ 288, 12 },
{ 12, 7 },
{ 9, 6 },
{ 9, 6 },
{ 8, 6 },
{ 8, 6 },
{ 7, 5 },
{ 7, 5 },
{ 7, 5 },
{ 7, 5 },
{ 6, 4 },
{ 6, 4 },
{ 6, 4 },
{ 6, 4 },
{ 6, 4 },
{ 6, 4 },
{ 6, 4 },
{ 6, 4 },
{ 5, 4 },
{ 5, 4 },
{ 5, 4 },
{ 5, 4 },
{ 5, 4 },
{ 5, 4 },
{ 5, 4 },
{ 5, 4 },
{ 1, 3 },
{ 1, 3 },
{ 1, 3 },
{ 1, 3 },
{ 1, 3 },
{ 1, 3 },
{ 1, 3 },
{ 1, 3 },
{ 1, 3 },
{ 1, 3 },
{ 1, 3 },
{ 1, 3 },
{ 1, 3 },
{ 1, 3 },
{ 1, 3 },
{ 1, 3 },
{ 4, 3 },
{ 4, 3 },
{ 4, 3 },
{ 4, 3 },
{ 4, 3 },
{ 4, 3 },
{ 4, 3 },
{ 4, 3 },
{ 4, 3 },
{ 4, 3 },
{ 4, 3 },
{ 4, 3 },
{ 4, 3 },
{ 4, 3 },
{ 4, 3 },
{ 4, 3 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 3, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ 2, 2 },
{ -2, 4 },
{ -2, 4 },
{ -1, 0 },
{ -1, 0 },
{ -1, 0 },
{ -1, 0 },
{ -1, 0 },
{ -1, 0 },
{ -1, 0 },
{ -1, 0 },
{ -1, 0 },
{ -1, 0 },
{ -1, 0 },
{ -1, 0 },
{ -1, 0 },
{ -3, 5 },
{ 1792, 4 },
{ 1792, 4 },
{ 1984, 5 },
{ 2048, 5 },
{ 2112, 5 },
{ 2176, 5 },
{ 2240, 5 },
{ 2304, 5 },
{ 1856, 4 },
{ 1856, 4 },
{ 1920, 4 },
{ 1920, 4 },
{ 2368, 5 },
{ 2432, 5 },
{ 2496, 5 },
{ 2560, 5 },
{ 18, 3 },
{ 18, 3 },
{ 18, 3 },
{ 18, 3 },
{ 18, 3 },
{ 18, 3 },
{ 18, 3 },
{ 18, 3 },
{ 52, 5 },
{ 52, 5 },
{ 640, 6 },
{ 704, 6 },
{ 768, 6 },
{ 832, 6 },
{ 55, 5 },
{ 55, 5 },
{ 56, 5 },
{ 56, 5 },
{ 1280, 6 },
{ 1344, 6 },
{ 1408, 6 },
{ 1472, 6 },
{ 59, 5 },
{ 59, 5 },
{ 60, 5 },
{ 60, 5 },
{ 1536, 6 },
{ 1600, 6 },
{ 24, 4 },
{ 24, 4 },
{ 24, 4 },
{ 24, 4 },
{ 25, 4 },
{ 25, 4 },
{ 25, 4 },
{ 25, 4 },
{ 1664, 6 },
{ 1728, 6 },
{ 320, 5 },
{ 320, 5 },
{ 384, 5 },
{ 384, 5 },
{ 448, 5 },
{ 448, 5 },
{ 512, 6 },
{ 576, 6 },
{ 53, 5 },
{ 53, 5 },
{ 54, 5 },
{ 54, 5 },
{ 896, 6 },
{ 960, 6 },
{ 1024, 6 },
{ 1088, 6 },
{ 1152, 6 },
{ 1216, 6 },
{ 64, 3 },
{ 64, 3 },
{ 64, 3 },
{ 64, 3 },
{ 64, 3 },
{ 64, 3 },
{ 64, 3 },
{ 64, 3 },
{ 13, 1 },
{ 13, 1 },
{ 13, 1 },
{ 13, 1 },
{ 13, 1 },
{ 13, 1 },
{ 13, 1 },
{ 13, 1 },
{ 13, 1 },
{ 13, 1 },
{ 13, 1 },
{ 13, 1 },
{ 13, 1 },
{ 13, 1 },
{ 13, 1 },
{ 13, 1 },
{ 23, 4 },
{ 23, 4 },
{ 50, 5 },
{ 51, 5 },
{ 44, 5 },
{ 45, 5 },
{ 46, 5 },
{ 47, 5 },
{ 57, 5 },
{ 58, 5 },
{ 61, 5 },
{ 256, 5 },
{ 16, 3 },
{ 16, 3 },
{ 16, 3 },
{ 16, 3 },
{ 17, 3 },
{ 17, 3 },
{ 17, 3 },
{ 17, 3 },
{ 48, 5 },
{ 49, 5 },
{ 62, 5 },
{ 63, 5 },
{ 30, 5 },
{ 31, 5 },
{ 32, 5 },
{ 33, 5 },
{ 40, 5 },
{ 41, 5 },
{ 22, 4 },
{ 22, 4 },
{ 14, 1 },
{ 14, 1 },
{ 14, 1 },
{ 14, 1 },
{ 14, 1 },
{ 14, 1 },
{ 14, 1 },
{ 14, 1 },
{ 14, 1 },
{ 14, 1 },
{ 14, 1 },
{ 14, 1 },
{ 14, 1 },
{ 14, 1 },
{ 14, 1 },
{ 14, 1 },
{ 15, 2 },
{ 15, 2 },
{ 15, 2 },
{ 15, 2 },
{ 15, 2 },
{ 15, 2 },
{ 15, 2 },
{ 15, 2 },
{ 128, 5 },
{ 192, 5 },
{ 26, 5 },
{ 27, 5 },
{ 28, 5 },
{ 29, 5 },
{ 19, 4 },
{ 19, 4 },
{ 20, 4 },
{ 20, 4 },
{ 34, 5 },
{ 35, 5 },
{ 36, 5 },
{ 37, 5 },
{ 38, 5 },
{ 39, 5 },
{ 21, 4 },
{ 21, 4 },
{ 42, 5 },
{ 43, 5 },
{ 0, 3 },
{ 0, 3 },
{ 0, 3 },
{ 0, 3 }
};
static int
jbig2_decode_get_code(Jbig2MmrCtx *mmr, const cfd_node *table, int initial_bits)
{
uint32_t word = mmr->word;
int table_ix = word >> (32 - initial_bits);
int val = table[table_ix].val;
int n_bits = table[table_ix].n_bits;
if (n_bits > 8)
{
int mask = (1 << (32 - initial_bits)) - 1;
table_ix = val + ((word & mask) >> (32 - n_bits));
val = table[table_ix].val;
n_bits = 8 + table[table_ix].n_bits + 8;
}
jbig2_decode_mmr_consume(mmr, n_bits);
return val;
}
static int
jbig2_decode_get_run(Jbig2MmrCtx *mmr, const cfd_node *table, int initial_bits)
{
int result = 0;
int val;
do
{
val = jbig2_decode_get_code(mmr, table, initial_bits);
result += val;
}
while (val >= 64);
return result;
}
static void
jbig2_decode_mmr_line(Jbig2MmrCtx *mmr, const byte *ref, byte *dst)
{
while (1)
{
uint32_t word = mmr->word;
/* printf ("%08x\n", word); */
if ((word >> (32 - 3)) == 1)
{
int white_run, black_run;
jbig2_decode_mmr_consume(mmr, 3);
white_run = jbig2_decode_get_run(mmr, cf_white_decode, 8);
black_run = jbig2_decode_get_run(mmr, cf_black_decode, 7);
/* printf ("H %d %d\n", white_run, black_run); */
}
else if ((word >> (32 - 4)) == 1)
{
/* printf ("P\n"); */
jbig2_decode_mmr_consume(mmr, 3);
}
else if ((word >> (32 - 1)) == 1)
{
/* printf ("V(0)\n"); */
jbig2_decode_mmr_consume(mmr, 1);
}
else if ((word >> (32 - 3)) == 3)
{
/* printf ("VR(1)\n"); */
jbig2_decode_mmr_consume(mmr, 3);
}
else if ((word >> (32 - 6)) == 3)
{
/* printf ("VR(2)\n"); */
jbig2_decode_mmr_consume(mmr, 6);
}
else if ((word >> (32 - 7)) == 3)
{
/* printf ("VR(3)\n"); */
jbig2_decode_mmr_consume(mmr, 7);
}
else if ((word >> (32 - 3)) == 2)
{
/* printf ("VL(1)\n"); */
jbig2_decode_mmr_consume(mmr, 3);
}
else if ((word >> (32 - 6)) == 2)
{
/* printf ("VL(2)\n"); */
jbig2_decode_mmr_consume(mmr, 6);
}
else if ((word >> (32 - 7)) == 2)
{
/* printf ("VL(3)\n"); */
jbig2_decode_mmr_consume(mmr, 7);
}
else
break;
}
}
int
jbig2_decode_generic_mmr(Jbig2Ctx *ctx,
Jbig2Segment *segment,
const Jbig2GenericRegionParams *params,
const byte *data, size_t size,
Jbig2Image *image)
{
Jbig2MmrCtx mmr;
const int rowstride = image->stride;
const byte *gbreg_line = (const byte *)image->data;
int y;
jbig2_decode_mmr_init(&mmr, image->width, image->height, data, size);
for (y = 0; y < image->height; y++)
{
jbig2_decode_mmr_line(&mmr, gbreg_line, NULL);
gbreg_line += rowstride;
}
return 0;
}