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/* See LICENSE file for copyright and license details. */
#include <arpa/inet.h>
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h>
#include <jpeglib.h>
char *argv0;
static jmp_buf setjmp_buffer;
static void
usage(void)
{
fprintf(stderr, "usage: %s\n", argv0);
exit(EXIT_FAILURE);
}
METHODDEF(void)
if_jpeg_error(j_common_ptr cinfo)
{
/* Always display the message. */
/* We could postpone this until after returning, if we chose. */
(*cinfo->err->output_message) (cinfo);
/* Return control to the setjmp point */
longjmp(setjmp_buffer, 1);
}
int
main(int argc, char *argv[])
{
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;
uint32_t width, height, val_be;
uint16_t *ff_row = NULL;
size_t jpeg_row_len, ff_row_len, i, dx, sx;
int status = EXIT_FAILURE;
JSAMPARRAY buffer; /* output row buffer */
argv0 = argv[0];
if (argc > 1)
usage();
/* load jpeg */
cinfo.err = jpeg_std_error(&jerr);
jerr.error_exit = if_jpeg_error;
/* Establish the setjmp return context for my_error_exit to use. */
if (setjmp(setjmp_buffer)) {
/* If we get here, the JPEG code has signaled an error.
* We need to clean up the JPEG object, close the input file, and return. */
goto cleanup;
}
jpeg_create_decompress(&cinfo);
jpeg_stdio_src(&cinfo, stdin);
jpeg_read_header(&cinfo, TRUE);
width = cinfo.image_width;
height = cinfo.image_height;
/* change output for farbfeld */
cinfo.output_components = 3; /* # of color components per pixel */
cinfo.out_color_space = JCS_RGB; /* colorspace of input image */
jpeg_start_decompress(&cinfo);
jpeg_row_len = width * cinfo.output_components;
/* Make a one-row-high sample array that will go away when done with image */
buffer = (*cinfo.mem->alloc_sarray)
((j_common_ptr) &cinfo, JPOOL_IMAGE, jpeg_row_len, 1);
ff_row_len = strlen("RRGGBBAA") * width;
if(!(ff_row = malloc(ff_row_len))) {
fprintf(stderr, "Can't malloc\n");
return EXIT_FAILURE;
}
/* write header with big endian width and height-values */
fprintf(stdout, "farbfeld");
val_be = htonl(width);
fwrite(&val_be, sizeof(uint32_t), 1, stdout);
val_be = htonl(height);
fwrite(&val_be, sizeof(uint32_t), 1, stdout);
while (cinfo.output_scanline < cinfo.output_height) {
/* jpeg_read_scanlines expects an array of pointers to scanlines.
* Here the array is only one element long, but you could ask for
* more than one scanline at a time if that's more convenient. */
(void)jpeg_read_scanlines(&cinfo, buffer, 1);
for(i = 0, dx = 0, sx = 0; i < width; i++, sx += 3, dx += 4) {
ff_row[dx] = htons(buffer[0][sx] * 257);
ff_row[dx+1] = htons(buffer[0][sx+1] * 257);
ff_row[dx+2] = htons(buffer[0][sx+2] * 257);
ff_row[dx+3] = htons(65535);
}
/* write data */
if (fwrite(ff_row, 1, ff_row_len, stdout) != ff_row_len) {
fprintf(stderr, "fwrite() failed\n");
goto cleanup;
}
}
jpeg_finish_decompress(&cinfo);
status = EXIT_SUCCESS;
cleanup:
free(ff_row);
jpeg_destroy_decompress(&cinfo);
return status;
}
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