/*
* If the file name contains size information encoded in it,
* then that size is returned, even if it differs from the actual
* file dimensions. (It might have been truncated).
* Otherwise, the actual file size is passed to fb_common_image_size()
* to see if this is a plausible image size.
*
* Returns -
* 0 size unknown
* 1 width and height returned
*/
int
fb_common_file_size(size_t *widthp, size_t *heightp, const char *filename, int pixel_size)
/* pointer to returned width */
/* pointer to returned height */
/* image file to stat */
/* bytes per pixel */
{
struct stat sbuf;
size_t size;
register const char *cp;
*widthp = *heightp = 0; /* sanity */
if (pixel_size <= 0) {
return 0;
}
if (filename == NULL || *filename == '\0') {
return 0;
}
/* Skip over directory names, if any */
cp = strchr(filename, '/');
if (cp) {
cp++; /* skip over slash */
} else {
cp = filename; /* no slash */
}
if (fb_common_name_size(widthp, heightp, cp))
return 1;
if (stat(filename, &sbuf) < 0)
return 0;
size = (size_t)(sbuf.st_size / pixel_size);
return fb_common_image_size(widthp, heightp, size);
}
int
main(int argc, char **argv)
{
int ret = 0;
int nsamp;
if ( !get_args( argc, argv ) || bytes_per_sample <= 0 ) {
(void)fputs(usage, stderr);
return 1;
}
if ( !file_name && file_length <= 0 ) {
(void)fputs(usage, stderr);
return 1;
}
if ( file_name ) {
if ( !fb_common_file_size(&width, &height, file_name, bytes_per_sample) ) {
fprintf(stderr, "pixautosize: unable to autosize file '%s'\n", file_name);
ret = 1; /* ERROR */
}
} else {
nsamp = file_length/bytes_per_sample;
if ( !fb_common_image_size(&width, &height, nsamp) ) {
fprintf(stderr, "pixautosize: unable to autosize nsamples=%d\n", nsamp);
ret = 2; /* ERROR */
}
}
/*
* Whether or not an error message was printed to stderr above,
* print out the width and height on stdout.
* They will be zero on error.
*/
printf("WIDTH=%lu; HEIGHT=%lu\n", width, height);
return ret;
}
