ref: 8384a640605066b60d21140504f92d31dd77947f
dir: /jbig2_segment.c/
/*
jbig2dec
Copyright (c) 2002 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_segment.c,v 1.5 2002/06/20 15:42:47 giles Exp $
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include "jbig2.h"
#include "jbig2_priv.h"
#include "jbig2_symbol_dict.h"
Jbig2SegmentHeader *
jbig2_parse_segment_header (Jbig2Ctx *ctx, uint8_t *buf, size_t buf_size,
size_t *p_header_size)
{
Jbig2SegmentHeader *result;
uint8_t rtscarf;
uint32_t rtscarf_long;
int referred_to_segment_count;
int referred_to_segment_size;
int pa_size;
int offset;
/* minimum possible size of a jbig2 segment header */
if (buf_size < 11)
return NULL;
result = (Jbig2SegmentHeader *)jbig2_alloc(ctx->allocator,
sizeof(Jbig2SegmentHeader));
/* 7.2.2 */
result->segment_number = jbig2_get_int32 (buf);
/* 7.2.3 */
result->flags = buf[4];
/* 7.2.4 */
rtscarf = buf[5];
if ((rtscarf & 0xe0) == 0xe0)
{
rtscarf_long = jbig2_get_int32(buf + 5);
referred_to_segment_count = rtscarf_long & 0x1fffffff;
offset = 5 + 4 + (referred_to_segment_count + 1) / 8;
}
else
{
referred_to_segment_count = (rtscarf >> 5);
offset = 5 + 1;
}
result->referred_to_segment_count = referred_to_segment_count;
/* 7.2.5 */
/* todo: read referred to segment numbers */
/* For now, we skip them. */
referred_to_segment_size = result->segment_number <= 256 ? 1:
result->segment_number <= 65536 ? 2:
4;
offset += referred_to_segment_count * referred_to_segment_size;
/* 7.2.6 */
pa_size = result->flags & 0x40 ? 4 : 1;
if (offset + pa_size + 4 > buf_size)
{
jbig2_free (ctx->allocator, result);
return NULL;
}
if (result->flags & 0x40) {
result->page_association = jbig2_get_int32(buf + offset);
offset += 4;
} else {
result->page_association = buf[offset++];
}
/* 7.2.7 */
result->data_length = jbig2_get_int32 (buf + offset);
*p_header_size = offset + 4;
return result;
}
void
jbig2_free_segment_header (Jbig2Ctx *ctx, Jbig2SegmentHeader *sh)
{
jbig2_free (ctx->allocator, sh);
}
void
jbig2_get_region_segment_info(Jbig2RegionSegmentInfo *info,
const byte *segment_data)
{
/* 7.4.1 */
info->width = jbig2_get_int32(segment_data);
info->height = jbig2_get_int32(segment_data + 4);
info->x = jbig2_get_int32(segment_data + 8);
info->y = jbig2_get_int32(segment_data + 12);
info->flags = segment_data[16];
}
int jbig2_write_segment (Jbig2Ctx *ctx, Jbig2SegmentHeader *sh,
const uint8_t *segment_data)
{
jbig2_error(ctx, JBIG2_SEVERITY_INFO, sh->segment_number,
"Segment %d, flags=%x, type=%d, data_length=%d",
sh->segment_number, sh->flags, sh->flags & 63,
sh->data_length);
switch (sh->flags & 63)
{
case 0:
return jbig2_symbol_dictionary(ctx, sh, segment_data);
case 4:
return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, sh->segment_number,
"unhandled segment type 'intermediate text region'");
case 6:
return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, sh->segment_number,
"unhandled segment type 'immediate text region'");
case 7:
return jbig2_read_text_info(ctx, sh, segment_data);
case 16:
return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, sh->segment_number,
"unhandled segment type 'pattern dictionary'");
case 20:
return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, sh->segment_number,
"unhandled segment type 'intermediate halftone region'");
case 22:
return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, sh->segment_number,
"unhandled segment type 'immediate halftone region'");
case 23:
return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, sh->segment_number,
"unhandled segment type 'immediate lossless halftone region'");
case 36:
return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, sh->segment_number,
"unhandled segment type 'intermediate generic region'");
case 38:
return jbig2_immediate_generic_region(ctx, sh, segment_data);
case 39:
return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, sh->segment_number,
"unhandled segment type 'immediate lossless generic region'");
case 40:
return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, sh->segment_number,
"unhandled segment type 'intermediate generic refinement region'");
case 42:
return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, sh->segment_number,
"unhandled segment type 'immediate generic refinement region'");
case 43:
return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, sh->segment_number,
"unhandled segment type 'immediate lossless generic refinement region'");
case 48:
return jbig2_read_page_info(ctx, sh, segment_data);
case 49:
return jbig2_complete_page(ctx, sh, segment_data);
case 50:
return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, sh->segment_number,
"unhandled segment type 'end of stripe'");
case 51:
ctx->state = JBIG2_FILE_EOF;
return jbig2_error(ctx, JBIG2_SEVERITY_INFO, sh->segment_number,
"end of file");
case 52:
return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, sh->segment_number,
"unhandled segment type 'profile'");
case 53:
return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, sh->segment_number,
"unhandled table segment");
case 62:
return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, sh->segment_number,
"unhandled extension segment");
default:
jbig2_error(ctx, JBIG2_SEVERITY_WARNING, sh->segment_number,
"unknown segment type %d", sh->flags & 63);
}
return 0;
}