328 lines
10 KiB
C
Executable File
328 lines
10 KiB
C
Executable File
/*
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jbig2dec
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Copyright (C) 2001-2005 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 <stdlib.h>
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#include "jbig2.h"
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#include "jbig2_priv.h"
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#ifdef OUTPUT_PBM
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#include <stdio.h>
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#include "jbig2_image.h"
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#endif
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/* dump the page struct info */
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static void
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dump_page_info(Jbig2Ctx *ctx, Jbig2Segment *segment, Jbig2Page *page)
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{
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if (page->x_resolution == 0) {
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jbig2_error(ctx, JBIG2_SEVERITY_INFO, segment->number,
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"page %d image is %dx%d (unknown res)", page->number,
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page->width, page->height);
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} else if (page->x_resolution == page->y_resolution) {
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jbig2_error(ctx, JBIG2_SEVERITY_INFO, segment->number,
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"page %d image is %dx%d (%d ppm)", page->number,
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page->width, page->height,
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page->x_resolution);
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} else {
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jbig2_error(ctx, JBIG2_SEVERITY_INFO, segment->number,
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"page %d image is %dx%d (%dx%d ppm)", page->number,
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page->width, page->height,
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page->x_resolution, page->y_resolution);
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}
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if (page->striped) {
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jbig2_error(ctx, JBIG2_SEVERITY_INFO, segment->number,
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"\tmaximum stripe size: %d", page->stripe_size);
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}
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}
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/**
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* jbig2_page_info: parse page info segment
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*
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* Parse the page info segment data and fill out a corresponding
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* Jbig2Page struct and ready it for subsequent rendered data,
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* including allocating an image buffer for the page (or the first stripe)
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**/
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int
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jbig2_page_info (Jbig2Ctx *ctx, Jbig2Segment *segment, const uint8_t *segment_data)
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{
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Jbig2Page *page;
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/* a new page info segment implies the previous page is finished */
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page = &(ctx->pages[ctx->current_page]);
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if ((page->number != 0) &&
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((page->state == JBIG2_PAGE_NEW) || (page->state == JBIG2_PAGE_FREE))) {
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page->state = JBIG2_PAGE_COMPLETE;
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jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number,
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"unexpected page info segment, marking previous page finished");
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}
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/* find a free page */
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{
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int index, j;
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index = ctx->current_page;
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while (ctx->pages[index].state != JBIG2_PAGE_FREE) {
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index++;
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if (index >= ctx->max_page_index) {
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/* grow the list */
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ctx->pages = jbig2_realloc(ctx->allocator, ctx->pages,
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(ctx->max_page_index <<= 2) * sizeof(Jbig2Page));
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for (j=index; j < ctx->max_page_index; j++) {
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ctx->pages[j].state = JBIG2_PAGE_FREE;
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ctx->pages[j].number = 0;
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ctx->pages[j].image = NULL;
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}
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}
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}
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page = &(ctx->pages[index]);
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ctx->current_page = index;
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page->state = JBIG2_PAGE_NEW;
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page->number = segment->page_association;
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}
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/* FIXME: would be nice if we tried to work around this */
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if (segment->data_length < 19) {
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return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
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"segment too short");
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}
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/* 7.4.8.x */
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page->width = jbig2_get_int32(segment_data);
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page->height = jbig2_get_int32(segment_data + 4);
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page->x_resolution = jbig2_get_int32(segment_data + 8);
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page->y_resolution = jbig2_get_int32(segment_data + 12);
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page->flags = segment_data[16];
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/* 7.4.8.6 */
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{
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int16_t striping = jbig2_get_int16(segment_data +17);
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if (striping & 0x8000) {
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page->striped = TRUE;
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page->stripe_size = striping & 0x7FFF;
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} else {
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page->striped = FALSE;
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page->stripe_size = 0; /* would page->height be better? */
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}
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}
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if (page->height == 0xFFFFFFFF && page->striped == FALSE) {
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jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number,
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"height is unspecified but page is not markes as striped");
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page->striped = TRUE;
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}
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page->end_row = 0;
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if (segment->data_length > 19) {
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jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number,
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"extra data in segment");
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}
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dump_page_info(ctx, segment, page);
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/* allocate an approprate page image buffer */
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/* 7.4.8.2 */
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if (page->height == 0xFFFFFFFF) {
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page->image = jbig2_image_new(ctx, page->width, page->stripe_size);
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} else {
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page->image = jbig2_image_new(ctx, page->width, page->height);
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}
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if (page->image == NULL) {
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return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,
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"failed to allocate buffer for page image");
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} else {
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/* 8.2 (3) fill the page with the default pixel value */
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jbig2_image_clear(ctx, page->image, (page->flags & 4));
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jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, segment->number,
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"allocated %dx%d page image (%d bytes)",
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page->image->width, page->image->height,
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page->image->stride*page->image->height);
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}
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return 0;
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}
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/**
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* jbig2_end_of_stripe: parse and implement an end of stripe segment
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**/
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int
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jbig2_end_of_stripe(Jbig2Ctx *ctx, Jbig2Segment *segment, const uint8_t *segment_data)
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{
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Jbig2Page page = ctx->pages[ctx->current_page];
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int end_row;
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end_row = jbig2_get_int32(segment_data);
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if (end_row < page.end_row) {
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jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number,
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"end of stripe segment with non-positive end row advance"
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" (new end row %d vs current end row %d)",
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end_row, page.end_row);
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} else {
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jbig2_error(ctx, JBIG2_SEVERITY_INFO, segment->number,
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"end of stripe: advancing end row to %d", end_row);
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}
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page.end_row = end_row;
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return 0;
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}
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/**
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* jbig2_complete_page: complete a page image
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*
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* called upon seeing an 'end of page' segment, this routine
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* marks a page as completed so it can be returned.
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* compositing will have already happened in the previous
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* segment handlers.
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**/
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int
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jbig2_complete_page (Jbig2Ctx *ctx)
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{
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/* check for unfinished segments */
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if (ctx->segment_index != ctx->n_segments) {
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Jbig2Segment *segment = ctx->segments[ctx->segment_index];
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int code = 0;
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/* Some versions of Xerox Workcentre generate PDF files
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with the segment data length field of the last segment
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set to -1. Try to cope with this here. */
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if ((segment->data_length & 0xffffffff) == 0xffffffff) {
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jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number,
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"File has an invalid segment data length!"
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" Trying to decode using the available data.");
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segment->data_length = ctx->buf_wr_ix - ctx->buf_rd_ix;
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code = jbig2_parse_segment(ctx, segment, ctx->buf + ctx->buf_rd_ix);
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ctx->buf_rd_ix += segment->data_length;
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ctx->segment_index++;
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}
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}
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ctx->pages[ctx->current_page].state = JBIG2_PAGE_COMPLETE;
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return 0;
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}
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/**
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* jbig2_end_of_page: parse and implement an end of page segment
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**/
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int
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jbig2_end_of_page(Jbig2Ctx *ctx, Jbig2Segment *segment, const uint8_t *segment_data)
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{
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uint32_t page_number = ctx->pages[ctx->current_page].number;
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if (segment->page_association != page_number) {
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jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number,
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"end of page marker for page %d doesn't match current page number %d",
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segment->page_association, page_number);
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}
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jbig2_error(ctx, JBIG2_SEVERITY_INFO, segment->number,
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"end of page %d", page_number);
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jbig2_complete_page(ctx);
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#ifdef OUTPUT_PBM
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jbig2_image_write_pbm(ctx->pages[ctx->current_page].image, stdout);
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#endif
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return 0;
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}
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/**
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* jbig2_add_page_result: composite a decoding result onto a page
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*
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* this is called to add the results of segment decode (when it
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* is an image) to a page image buffer
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**/
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int
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jbig2_page_add_result(Jbig2Ctx *ctx, Jbig2Page *page, Jbig2Image *image,
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int x, int y, Jbig2ComposeOp op)
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{
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/* grow the page to accomodate a new stripe if necessary */
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if (page->striped) {
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int new_height = y + image->height + page->end_row;
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if (page->image->height < new_height) {
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jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, -1,
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"growing page buffer to %d rows "
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"to accomodate new stripe", new_height);
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jbig2_image_resize(ctx, page->image,
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page->image->width, new_height);
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}
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}
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jbig2_image_compose(ctx, page->image, image,
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x, y + page->end_row, JBIG2_COMPOSE_OR);
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return 0;
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}
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/**
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* jbig2_get_page: return the next available page image buffer
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*
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* the client can call this at any time to check if any pages
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* have been decoded. If so, it returns the first available
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* one. The client should then call jbig2_release_page() when
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* it no longer needs to refer to the image buffer.
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*
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* since this is a public routine for the library clients, we
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* return an image structure pointer, even though the function
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* name refers to a page; the page structure is private.
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**/
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Jbig2Image *jbig2_page_out(Jbig2Ctx *ctx)
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{
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int index;
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/* search for a completed page */
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for (index=0; index < ctx->max_page_index; index++) {
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if (ctx->pages[index].state == JBIG2_PAGE_COMPLETE) {
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ctx->pages[index].state = JBIG2_PAGE_RETURNED;
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jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, -1,
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"page %d returned to the client", ctx->pages[index].number);
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return jbig2_image_clone(ctx, ctx->pages[index].image);
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}
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}
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/* no pages available */
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return NULL;
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}
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/**
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* jbig2_release_page: tell the library a page can be freed
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**/
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int jbig2_release_page(Jbig2Ctx *ctx, Jbig2Image *image)
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{
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int index;
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/* find the matching page struct and mark it released */
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for (index = 0; index < ctx->max_page_index; index++) {
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if (ctx->pages[index].image == image) {
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jbig2_image_release(ctx, image);
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ctx->pages[index].state = JBIG2_PAGE_RELEASED;
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jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, -1,
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"page %d released by the client", ctx->pages[index].number);
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return 0;
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}
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}
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/* no matching pages */
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jbig2_error(ctx, JBIG2_SEVERITY_WARNING, -1,
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"jbig2_release_page called on unknown page");
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return 1;
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}
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