cd9660_chars2ui
buf[0] = cd9660_chars2ui(pi,4) - 1900;
buf[1] = cd9660_chars2ui(pi + 4,2);
buf[2] = cd9660_chars2ui(pi + 6,2);
buf[3] = cd9660_chars2ui(pi + 8,2);
buf[4] = cd9660_chars2ui(pi + 10,2);
buf[5] = cd9660_chars2ui(pi + 12,2);
static unsigned cd9660_chars2ui(unsigned char *begin, int len);