ref: dcb620344060d47d77e620d23c0e3e6aa3838f6b
dir: /jbig2_page.c/
/*
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_page.c,v 1.2 2002/06/15 16:02:55 giles Exp $
*/
#include <stdio.h>
#include <stdlib.h>
#include "jbig2.h"
#include "jbig2_priv.h"
/* parse the page info segment data starting at ctx->offset
a pointer to a new Jbig2PageInfo struct is returned
the ctx->offset pointer is not advanced; the caller must
take care of that, using the data_length field of the
segment header.
*/
static Jbig2PageInfo *
jbig2_read_page_info (Jbig2Ctx *ctx) {
Jbig2PageInfo *info = (Jbig2PageInfo *)jbig2_alloc(ctx->allocator, sizeof(Jbig2PageInfo));
int offset = ctx->buf_rd_ix;
if (info == NULL) {
printf("unable to allocate memory to parse page info segment\n");
return NULL;
}
info->width = get_int32(ctx, offset);
info->height = get_int32(ctx, offset + 4);
offset += 8;
info->x_resolution = get_int32(ctx, offset);
info->y_resolution = get_int32(ctx, offset + 4);
offset += 8;
get_bytes(ctx, &(info->flags), 1, offset++);
{
int16_t striping = get_int16(ctx, offset);
if (striping & 0x8000) {
info->striped = TRUE;
info->stripe_size = striping & 0x7FFF;
} else {
info->striped = FALSE;
info->stripe_size = 0; /* would info->height be better? */
}
offset += 2;
}
return info;
}
/* dump the page info struct */
static void
dump_page_info(Jbig2PageInfo *info)
{
FILE *out = stderr;
fprintf(out, "image is %dx%d ", info->width, info->height);
if (info->x_resolution == 0) {
fprintf(out, "(unknown res) ");
} else if (info->x_resolution == info->y_resolution) {
fprintf(out, "(%d ppm) ", info->x_resolution);
} else {
fprintf(out, "(%dx%d ppm) ", info->x_resolution, info->y_resolution);
}
if (info->striped) {
fprintf(out, "\tmaximum stripe size: %d\n", info->stripe_size);
} else {
fprintf(out, "\tno striping\n");
}
}