151 lines
4.0 KiB
C
Executable File
151 lines
4.0 KiB
C
Executable File
/*
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jbig2dec
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Copyright (C) 2009 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 <stdio.h>
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#include <ctype.h>
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#include "jbig2.h"
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#include "jbig2_image.h"
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/* take an image structure and write it to a file in pbm format */
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int jbig2_image_write_pbm_file(Jbig2Image *image, char *filename)
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{
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FILE *out;
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int error;
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if ((out = fopen(filename, "wb")) == NULL) {
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fprintf(stderr, "unable to open '%s' for writing", filename);
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return 1;
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}
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error = jbig2_image_write_pbm(image, out);
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fclose(out);
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return (error);
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}
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/* write out an image struct as a pbm stream to an open file pointer */
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int jbig2_image_write_pbm(Jbig2Image *image, FILE *out)
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{
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/* pbm header */
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fprintf(out, "P4\n%d %d\n", image->width, image->height);
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/* pbm format pads to a byte boundary, so we can
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just write out the whole data buffer
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NB: this assumes minimal stride for the width */
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fwrite(image->data, 1, image->height*image->stride, out);
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/* success */
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return 0;
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}
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/* take an image from a file in pbm format */
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Jbig2Image *jbig2_image_read_pbm_file(Jbig2Ctx *ctx, char *filename)
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{
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FILE *in;
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Jbig2Image *image;
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if ((in = fopen(filename, "rb")) == NULL) {
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fprintf(stderr, "unable to open '%s' for reading\n", filename);
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return NULL;
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}
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image = jbig2_image_read_pbm(ctx, in);
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fclose(in);
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return (image);
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}
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/* FIXME: should handle multi-image files */
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Jbig2Image *jbig2_image_read_pbm(Jbig2Ctx *ctx, FILE *in)
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{
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int i, dim[2];
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int done;
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Jbig2Image *image;
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int c;
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char buf[32];
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/* look for 'P4' magic */
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while ((c = fgetc(in)) != 'P') {
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if (feof(in)) return NULL;
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}
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if ((c = fgetc(in)) != '4') {
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fprintf(stderr, "not a binary pbm file.\n");
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return NULL;
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}
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/* read size. we must find two decimal numbers representing
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the image dimensions. 'done' will index whether we're
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looking for the width or the height and 'i' will be our
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array index for copying strings into our buffer */
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done = 0;
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i = 0;
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while (done < 2) {
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c = fgetc(in);
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/* skip whitespace */
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if (c == ' ' || c == '\t' || c == '\r' || c == '\n') continue;
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/* skip comments */
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if (c == '#') {
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while ((c = fgetc(in)) != '\n');
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continue;
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}
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/* report unexpected eof */
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if (c == EOF) {
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fprintf(stderr, "end-of-file parsing pbm header\n");
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return NULL;
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}
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if (isdigit(c)) {
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buf[i++] = c;
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while (isdigit(c = fgetc(in))) {
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if (i >= 32) {
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fprintf(stderr, "pbm parsing error\n");
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return NULL;
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}
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buf[i++] = c;
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}
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buf[i] = '\0';
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if (sscanf(buf, "%d", &dim[done]) != 1) {
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fprintf(stderr, "couldn't read pbm image dimensions\n");
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return NULL;
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}
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i = 0;
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done++;
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}
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}
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/* allocate image structure */
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image = jbig2_image_new(ctx, dim[0], dim[1]);
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if (image == NULL) {
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fprintf(stderr, "could not allocate %dx%d image for pbm file\n", dim[0], dim[1]);
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return NULL;
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}
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/* the pbm data is byte-aligned, so we can
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do a simple block read */
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fread(image->data, 1, image->height*image->stride, in);
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if (feof(in)) {
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fprintf(stderr, "unexpected end of pbm file.\n");
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jbig2_image_release(ctx, image);
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return NULL;
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}
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/* success */
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return image;
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}
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