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/*
* Copyright (c) 2020-2021, yzrh <yzrh@noema.org>
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdlib.h>
#include <string.h>
#include "cnki_jbig.h"
#include "jbig.h"
int
cnki_jbig(char **bitmap, int *bitmap_size,
int *bitmap_width, int *bitmap_height,
const char * restrict jbig, int jbig_size)
{
dib_t *dib = malloc(sizeof(dib_t));
if (dib == NULL)
return 1;
memcpy(dib, jbig, 40);
bih_t *bih = malloc(sizeof(bih_t));
if (bih == NULL) {
free(dib);
return 1;
}
memset(bih, 0, sizeof(bih_t));
bih->d_l = 0;
bih->d = 0;
bih->p = 1;
bih->fill = 0;
bih->x_d = dib->width;
bih->y_d = dib->height;
bih->l_0 = bih->y_d / 35;
while (bih->l_0 > 128)
bih->l_0--;
if (bih->l_0 < 2)
bih->l_0 = 2;
bih->m_x = 8;
bih->m_y = 0;
bih->order |= 1 << 1;
bih->order |= 1 << 0;
bih->options |= 1 << 4;
bih->options |= 1 << 3;
bih->options |= 1 << 2;
bih->dptable = NULL;
int bie_size = jbig_size - 28; /* - 40 - 8 + 20 */
char *bie = malloc(bie_size);
if (bie == NULL) {
free(dib);
free(bih);
return 1;
}
memcpy(bie, bih, 20);
memcpy(bie + 20, jbig + 48, jbig_size - 48);
int ret = strdec_jbig(bitmap, bitmap_size, bie, bie_size);
if (ret == 0) {
*bitmap_width = bih->x_d;
*bitmap_height = bih->y_d;
}
free(dib);
free(bih);
free(bie);
if (ret != 0)
return 1;
return 0;
}
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