296 lines
9.5 KiB
C
Executable File
296 lines
9.5 KiB
C
Executable File
/*
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jbig2dec
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Copyright (C) 2002-2005 Artifex Software, Inc.
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This software is distributed under license and may not
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be copied, modified or distributed except as expressly
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authorized under the terms of the license contained in
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the file LICENSE in this distribution.
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For further licensing information refer to http://artifex.com/ or
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contact Artifex Software, Inc., 7 Mt. Lassen Drive - Suite A-134,
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San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "os_types.h"
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#include <stddef.h> /* size_t */
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#include "jbig2.h"
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#include "jbig2_priv.h"
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#include "jbig2_symbol_dict.h"
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#include "jbig2_metadata.h"
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Jbig2Segment *
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jbig2_parse_segment_header (Jbig2Ctx *ctx, uint8_t *buf, size_t buf_size,
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size_t *p_header_size)
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{
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Jbig2Segment *result;
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uint8_t rtscarf;
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uint32_t rtscarf_long;
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uint32_t *referred_to_segments;
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int referred_to_segment_count;
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int referred_to_segment_size;
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int pa_size;
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int offset;
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/* minimum possible size of a jbig2 segment header */
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if (buf_size < 11)
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return NULL;
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result = (Jbig2Segment *)jbig2_alloc(ctx->allocator,
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sizeof(Jbig2Segment));
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/* 7.2.2 */
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result->number = jbig2_get_int32(buf);
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/* 7.2.3 */
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result->flags = buf[4];
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/* 7.2.4 referred-to segments */
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rtscarf = buf[5];
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if ((rtscarf & 0xe0) == 0xe0)
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{
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rtscarf_long = jbig2_get_int32(buf + 5);
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referred_to_segment_count = rtscarf_long & 0x1fffffff;
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offset = 5 + 4 + (referred_to_segment_count + 1) / 8;
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}
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else
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{
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referred_to_segment_count = (rtscarf >> 5);
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offset = 5 + 1;
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}
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result->referred_to_segment_count = referred_to_segment_count;
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/* we now have enough information to compute the full header length */
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referred_to_segment_size = result->number <= 256 ? 1:
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result->number <= 65536 ? 2 : 4; /* 7.2.5 */
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pa_size = result->flags & 0x40 ? 4 : 1; /* 7.2.6 */
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if (offset + referred_to_segment_count*referred_to_segment_size + pa_size + 4 > buf_size)
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{
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jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, result->number,
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"jbig2_parse_segment_header() called with insufficient data", -1);
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jbig2_free (ctx->allocator, result);
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return NULL;
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}
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/* 7.2.5 */
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if (referred_to_segment_count)
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{
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int i;
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referred_to_segments = jbig2_alloc(ctx->allocator, referred_to_segment_count * referred_to_segment_size * sizeof(uint32_t));
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for (i = 0; i < referred_to_segment_count; i++) {
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referred_to_segments[i] =
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(referred_to_segment_size == 1) ? buf[offset] :
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(referred_to_segment_size == 2) ? jbig2_get_int16(buf+offset) :
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jbig2_get_int32(buf + offset);
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offset += referred_to_segment_size;
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jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, result->number,
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"segment %d refers to segment %d",
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result->number, referred_to_segments[i]);
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}
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result->referred_to_segments = referred_to_segments;
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}
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else /* no referred-to segments */
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{
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result->referred_to_segments = NULL;
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}
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/* 7.2.6 */
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if (result->flags & 0x40) {
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result->page_association = jbig2_get_int32(buf + offset);
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offset += 4;
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} else {
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result->page_association = buf[offset++];
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}
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jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, result->number,
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"segment %d is associated with page %d",
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result->number, result->page_association);
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/* 7.2.7 */
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result->data_length = jbig2_get_int32(buf + offset);
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*p_header_size = offset + 4;
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/* no body parsing results yet */
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result->result = NULL;
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return result;
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}
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void
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jbig2_free_segment (Jbig2Ctx *ctx, Jbig2Segment *segment)
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{
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if (segment->referred_to_segments != NULL) {
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jbig2_free(ctx->allocator, segment->referred_to_segments);
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}
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/* todo: we need either some separate fields or
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a more complex result object rather than this
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brittle special casing */
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switch (segment->flags & 63) {
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case 0: /* symbol dictionary */
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if (segment->result != NULL)
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jbig2_sd_release(ctx, segment->result);
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break;
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case 4: /* intermediate text region */
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case 40: /* intermediate refinement region */
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if (segment->result != NULL)
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jbig2_image_release(ctx, segment->result);
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break;
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case 62:
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if (segment->result != NULL)
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jbig2_metadata_free(ctx, segment->result);
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break;
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default:
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/* anything else is probably an undefined pointer */
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break;
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}
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jbig2_free (ctx->allocator, segment);
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}
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/* find a segment by number */
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Jbig2Segment *
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jbig2_find_segment(Jbig2Ctx *ctx, uint32_t number)
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{
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int index, index_max = ctx->segment_index - 1;
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const Jbig2Ctx *global_ctx = ctx->global_ctx;
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/* FIXME: binary search would be better */
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for (index = index_max; index >= 0; index--)
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if (ctx->segments[index]->number == number)
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return (ctx->segments[index]);
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if (global_ctx)
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for (index = global_ctx->segment_index - 1; index >= 0; index--)
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if (global_ctx->segments[index]->number == number)
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return (global_ctx->segments[index]);
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/* didn't find a match */
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return NULL;
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}
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/* parse the generic portion of a region segment data header */
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void
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jbig2_get_region_segment_info(Jbig2RegionSegmentInfo *info,
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const uint8_t *segment_data)
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{
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/* 7.4.1 */
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info->width = jbig2_get_int32(segment_data);
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info->height = jbig2_get_int32(segment_data + 4);
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info->x = jbig2_get_int32(segment_data + 8);
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info->y = jbig2_get_int32(segment_data + 12);
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info->flags = segment_data[16];
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info->op = info->flags & 0x7;
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}
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/* dispatch code for extension segment parsing */
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int jbig2_parse_extension_segment(Jbig2Ctx *ctx, Jbig2Segment *segment,
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const uint8_t *segment_data)
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{
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uint32_t type;
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bool reserved, dependent, necessary;
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type = jbig2_get_int32(segment_data);
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reserved = type & 0x20000000;
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dependent = type & 0x40000000;
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necessary = type & 0x80000000;
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if (necessary && !reserved) {
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jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number,
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"extension segment is marked 'necessary' but not 'reservered' contrary to spec");
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}
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switch (type) {
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case 0x20000000: return jbig2_comment_ascii(ctx, segment, segment_data);
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case 0x20000002: return jbig2_comment_unicode(ctx, segment, segment_data);
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default:
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if (necessary) {
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return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
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"unhandled necessary extension segment type 0x%08x", type);
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} else {
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return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number,
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"unhandled extension segment");
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}
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}
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return 0;
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}
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/* general segment parsing dispatch */
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int jbig2_parse_segment (Jbig2Ctx *ctx, Jbig2Segment *segment,
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const uint8_t *segment_data)
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{
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jbig2_error(ctx, JBIG2_SEVERITY_INFO, segment->number,
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"Segment %d, flags=%x, type=%d, data_length=%d",
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segment->number, segment->flags, segment->flags & 63,
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segment->data_length);
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switch (segment->flags & 63)
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{
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case 0:
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return jbig2_symbol_dictionary(ctx, segment, segment_data);
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case 4: /* intermediate text region */
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case 6: /* immediate text region */
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case 7: /* immediate lossless text region */
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return jbig2_text_region(ctx, segment, segment_data);
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#ifdef JBIG2_HALFTONE
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case 16:
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return jbig2_pattern_dictionary(ctx, segment, segment_data);
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case 20: /* intermediate halftone region */
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case 22: /* immediate halftone region */
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case 23: /* immediate lossless halftone region */
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return jbig2_halftone_region(ctx, segment, segment_data);
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#else
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case 16:
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return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number,
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"unhandled segment type 'pattern dictionary'");
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case 20:
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return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number,
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"unhandled segment type 'intermediate halftone region'");
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case 22:
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return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number,
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"unhandled segment type 'immediate halftone region'");
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case 23:
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return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number,
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"unhandled segment type 'immediate lossless halftone region'");
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#endif
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case 36:
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return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number,
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"unhandled segment type 'intermediate generic region'");
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case 38: /* immediate generic region */
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case 39: /* immediate lossless generic region */
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return jbig2_immediate_generic_region(ctx, segment, segment_data);
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case 40: /* intermediate generic refinement region */
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case 42: /* immediate generic refinement region */
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case 43: /* immediate lossless generic refinement region */
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return jbig2_refinement_region(ctx, segment, segment_data);
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case 48:
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return jbig2_page_info(ctx, segment, segment_data);
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case 49:
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return jbig2_end_of_page(ctx, segment, segment_data);
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case 50:
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return jbig2_end_of_stripe(ctx, segment, segment_data);
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case 51:
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ctx->state = JBIG2_FILE_EOF;
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return jbig2_error(ctx, JBIG2_SEVERITY_INFO, segment->number,
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"end of file");
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case 52:
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return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number,
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"unhandled segment type 'profile'");
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case 53:
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return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number,
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"unhandled table segment");
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case 62:
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return jbig2_parse_extension_segment(ctx, segment, segment_data);
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default:
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jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number,
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"unknown segment type %d", segment->flags & 63);
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}
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return 0;
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}
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