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#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <errno.h>
#include <jpeglib.h>
#include <setjmp.h>
#include <libexif/exif-data.h>
#include "readers.h"
#include "misc.h"
/* ---------------------------------------------------------------------- */
/* load */
struct jpeg_state {
FILE * infile; /* source file */
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;
jmp_buf errjump;
JSAMPARRAY buffer; /* Output row buffer */
int row_stride,linelength; /* physical row width in output buffer */
unsigned char *image,*ptr;
/* thumbnail */
unsigned char *thumbnail;
unsigned int tpos, tsize;
};
/* ---------------------------------------------------------------------- */
/* data source manager for thumbnail images */
static void thumbnail_src_init(struct jpeg_decompress_struct *cinfo)
{
struct jpeg_state *h = container_of(cinfo, struct jpeg_state, cinfo);
cinfo->src->next_input_byte = h->thumbnail;
cinfo->src->bytes_in_buffer = h->tsize;
}
static int thumbnail_src_fill(struct jpeg_decompress_struct *cinfo)
{
fprintf(stderr,"jpeg: panic: no more thumbnail input data\n");
exit(1);
}
static void thumbnail_src_skip(struct jpeg_decompress_struct *cinfo,
long num_bytes)
{
cinfo->src->next_input_byte += num_bytes;
}
static void thumbnail_src_term(struct jpeg_decompress_struct *cinfo)
{
/* nothing */
}
static struct jpeg_source_mgr thumbnail_mgr = {
.init_source = thumbnail_src_init,
.fill_input_buffer = thumbnail_src_fill,
.skip_input_data = thumbnail_src_skip,
.resync_to_restart = jpeg_resync_to_restart,
.term_source = thumbnail_src_term,
};
/* ---------------------------------------------------------------------- */
/* jpeg loader */
static void jerror_exit(j_common_ptr info)
{
struct jpeg_decompress_struct *cinfo = (struct jpeg_decompress_struct *)info;
struct jpeg_state *h = container_of(cinfo, struct jpeg_state, cinfo);
cinfo->err->output_message(info);
longjmp(h->errjump, 1);
jpeg_destroy_decompress(cinfo);
exit(1);
}
static void*
jpeg_init(FILE *fp, char *filename, unsigned int page,
struct ida_image_info *i, int thumbnail)
{
struct jpeg_state *h;
jpeg_saved_marker_ptr mark;
h = malloc(sizeof(*h));
memset(h,0,sizeof(*h));
h->infile = fp;
h->cinfo.err = jpeg_std_error(&h->jerr);
h->cinfo.err->error_exit = jerror_exit;
if(setjmp(h->errjump))
return 0;
jpeg_create_decompress(&h->cinfo);
jpeg_save_markers(&h->cinfo, JPEG_COM, 0xffff); /* comment */
jpeg_save_markers(&h->cinfo, JPEG_APP0+1, 0xffff); /* EXIF */
jpeg_stdio_src(&h->cinfo, h->infile);
jpeg_read_header(&h->cinfo, TRUE);
for (mark = h->cinfo.marker_list; NULL != mark; mark = mark->next) {
switch (mark->marker) {
case JPEG_COM:
if (debug)
fprintf(stderr,"jpeg: comment found (COM marker) [%.*s]\n",
(int)mark->data_length, mark->data);
load_add_extra(i,EXTRA_COMMENT,mark->data,mark->data_length);
break;
case JPEG_APP0 +1:
if (debug)
fprintf(stderr,"jpeg: exif data found (APP1 marker)\n");
load_add_extra(i,EXTRA_COMMENT,mark->data,mark->data_length);
if (thumbnail) {
ExifData *ed;
ed = exif_data_new_from_data(mark->data,mark->data_length);
if (ed->data &&
ed->data[0] == 0xff &&
ed->data[1] == 0xd8) {
if (debug)
fprintf(stderr,"jpeg: exif thumbnail found\n");
/* save away thumbnail data */
h->thumbnail = malloc(ed->size);
h->tsize = ed->size;
memcpy(h->thumbnail,ed->data,ed->size);
}
exif_data_unref(ed);
}
break;
}
}
if (h->thumbnail) {
/* save image size */
i->thumbnail = 1;
i->real_width = h->cinfo.image_width;
i->real_height = h->cinfo.image_height;
/* re-setup jpeg */
jpeg_destroy_decompress(&h->cinfo);
fclose(h->infile);
h->infile = NULL;
jpeg_create_decompress(&h->cinfo);
h->cinfo.src = &thumbnail_mgr;
jpeg_read_header(&h->cinfo, TRUE);
}
h->cinfo.out_color_space = JCS_RGB;
jpeg_start_decompress(&h->cinfo);
i->width = h->cinfo.image_width;
i->height = h->cinfo.image_height;
i->npages = 1;
switch (h->cinfo.density_unit) {
case 0: /* unknown */
break;
case 1: /* dot per inch */
i->dpi = h->cinfo.X_density;
break;
case 2: /* dot per cm */
i->dpi = res_cm_to_inch(h->cinfo.X_density);
break;
}
return h;
}
static void
jpeg_read(unsigned char *dst, unsigned int line, void *data)
{
struct jpeg_state *h = data;
JSAMPROW row = dst;
if(setjmp(h->errjump))
return;
jpeg_read_scanlines(&h->cinfo, &row, 1);
}
static void
jpeg_done(void *data)
{
struct jpeg_state *h = data;
if (setjmp(h->errjump))
return;
jpeg_destroy_decompress(&h->cinfo);
if (h->infile)
fclose(h->infile);
if (h->thumbnail)
free(h->thumbnail);
free(h);
}
struct ida_loader jpeg_loader = {
magic: "\xff\xd8",
moff: 0,
mlen: 2,
name: "libjpeg",
init: jpeg_init,
read: jpeg_read,
done: jpeg_done,
};
static void __init init_rd(void)
{
load_register(&jpeg_loader);
}
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