C > Miscellaneous

Extract MacBinary data

Extract MacBinary data

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

int main(int argc, char *argv[]) {
 char buf[128] = {0};
 int fd_in = -1, fd_out = -1;
 long data_len;

 if(argc != 2) {
  fprintf(stderr, "Usage: MacBinary\n");
  return 1;
 }

 if((fd_in = open(argv[1], O_RDONLY)) == -1) {
  fprintf(stderr, "Error: `open(%s)'\n", argv[1]);
  return 1;
 }

 read(fd_in, buf, 128);
 buf[2 + buf[1]] = 0x00;

 data_len = buf[86] + 256 * (buf[85] + 256 * (buf [84] + 256 * buf[83]));

 if((fd_out = open(&buf[2], O_RDONLY|O_CREAT, 0666)) == -1) {
  fprintf(stderr, "Error: `open(%s)'\n", &buf[2]);
  return 1;
 }

 for(; data_len > 0; data_len -= 128)
  write(fd_out, buf, read(fd_in ,buf, data_len < 128 ? data_len : 128));

 close(fd_out);
 close(fd_in);

 return 0;
}