Function StripCRCFileName

Descent3/pilot.cpp:2143–2182

StripCRCFileName Given a filename that has the _ in it at the end of the name, it will fill in dest with just the filename part (without the trailing _ ).

//	Given a filename that has the _<CRC> in it at the end of the name, it will fill
//	in dest with just the filename part (without the trailing _<CRC>).
void StripCRCFileName(const char *src, char *dest) {
  ASSERT(src);
  ASSERT(dest);

  int full_strlen = strlen(src);
  char ext[256];
  ddio_SplitPath(src, NULL, NULL, ext);
  int extstrlen = strlen(ext);
  int eon = full_strlen - 9 - extstrlen;

  if (eon < 1) {
    // this filename doesn't have a trailing CRC
    strcpy(dest, src);
    return;
  }

  // check to make sure the [eon] is '_'
  if (src[eon] != '_') {
    // it wasn't so it must not have a CRC at the end
    strcpy(dest, src);
    return;
  }

  char hexstring[9];
  strncpy(hexstring, &src[eon + 1], 8);
  hexstring[8] = '\0';
  uint32_t crc;
  crc = axtoi(hexstring);

  if (crc == 0) {
    // crc can't be 0?
    strcpy(dest, src);
    return;
  }

  // strip the filename
  strncpy(dest, src, eon);
  dest[eon] = '\0';
  strcat(dest, ext); // put back the extension
}

//	CreateCRCFileName
//