filter out other file formats

gistfile1.txt

bool isKTX2Header(const uint8_t *buffer, size_t size) {
  const uint8_t ktx2Identifier[12] = {0xAB, 0x4B, 0x54, 0x58, 0x20, 0x32,
                                      0x30, 0xBB, 0x0D, 0x0A, 0x1A, 0x0A};

  if (size < 12) {
    return false; // Buffer is too small to be a KTX2 header
  }

  // Compare the first 12 bytes of the buffer with the KTX2 identifier
  return memcmp(buffer, ktx2Identifier, 12) == 0;
}

bool isEXRHeader(const uint8_t* buffer, size_t size) {
    const uint8_t exrMagicNumber[4] = {0x76, 0x2F, 0x31, 0x01};

    if (size < 4) {
        return false;  // Buffer is too small to be an EXR header
    }

    // Compare the first 4 bytes of the buffer with the EXR magic number
    return memcmp(buffer, exrMagicNumber, 4) == 0;
}