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/*
* jpeg DGI:
*
* build a jpeg extractor using the exif library.
*/
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
int main(int argc,char **argv)
{
char cmdbuf[1024]; // command buffer
char linebuf[1024];
if(argc!=2){
fprintf(stderr,"usage: %s <filename>",argv[0]);
exit(1);
}
sprintf(cmdbuf,"exif -m %s 2>/dev/null",argv[1]);
FILE *f = popen(cmdbuf,"r");
if(!f) perror(cmdbuf);
/* the exif -m command will give us lines of output, tab delimited.
* For DGI output we want names: values
*/
while(fgets(linebuf,sizeof(linebuf),f)){
/* Fix known errors in formatting */
if(strncmp(linebuf,"Date and Time",13)==0){
char *ds = strchr(linebuf,'\t');
if(ds && ds[5]==':' && ds[8]==':'){
ds[5]='-';
ds[8]='-';
}
}
bool before = true;
for(char *cc=linebuf;*cc;cc++){ // change ' '->'_" and '\t'->':' until we find the \t
if(before){
switch(*cc){
case ' ': putchar('-');break;
case ':': putchar('-');break;
case '(': putchar('-');break;
case ')': putchar('-');break;
case '\t': putchar(':');putchar(' ');before=false;break;
default: putchar(*cc);break;
}
}
else {
putchar(*cc);
}
}
}
pclose(f);
return(0);
}
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