/*
* doit.c: Quick hack to play a sequence of GIF files.
*
* Rob McCool
*
* This code is released into the public domain.  Do whatever
* you want with it.
*
*/

#include <sys/types.h>
#include <sys/mman.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <stdio.h>

#define LASTCHAR 'p'

#define HEADER \
"Content-type: multipart/x-mixed-replace;boundary=ThisRandomString\n" \

#define RANDOMSTRING "\n--ThisRandomString\n"
#define ENDSTRING "\n--ThisRandomString--\n"
#define CTSTRING "Content-type: image/gif\n\n"

int main()
{
   struct stat fi;
   char fn[32];
   caddr_t fp;
   unsigned char x;
   int fd;

   if(write(STDOUT_FILENO, HEADER, strlen(HEADER)) == -1)
       exit(0);
   if(write(STDOUT_FILENO, RANDOMSTRING, strlen(RANDOMSTRING)) == -1)
       exit(0);

   x = 'a';

   while(1) {
       sleep(1);
       if(write(STDOUT_FILENO, CTSTRING, strlen(CTSTRING)) == -1)
           exit(0);
       sprintf(fn, "images/a%c.gif", (char) x);
       if( (fd = open(fn, O_RDONLY)) == -1)
           continue;
       fstat(fd, &fi);
       fp = mmap(NULL, fi.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
       if(fp == (caddr_t) -1)
           exit(0);
       if(write(STDOUT_FILENO, (void *) fp, fi.st_size) == -1)
           exit(0);
       munmap(fp, fi.st_size);
       close(fd);
       if(write(STDOUT_FILENO, RANDOMSTRING, strlen(RANDOMSTRING)) == -1)
           exit(0);
       if(x == LASTCHAR) goto thats_it;
       else ++x;
   }

   /* This goto is Marc's fault.  Marc digs goto. */

thats_it:
   exit (0);
}