SmartDraw Drawing file (.sdr)

def is_sdr(file_path: str) -> bool:
    """Check if file is a valid SDR by magic bytes."""
    signature = bytes([0x53, 0x4D, 0x41, 0x52, 0x54, 0x44, 0x52, 0x57])
    with open(file_path, "rb") as f:
        return f.read(8) == signature

function isSDR(buffer: Buffer): boolean {
  const signature = Buffer.from([0x53, 0x4D, 0x41, 0x52, 0x54, 0x44, 0x52, 0x57]);
  return buffer.subarray(0, 8).equals(signature);
}

func IsSDR(data []byte) bool {
    signature := []byte{0x53, 0x4D, 0x41, 0x52, 0x54, 0x44, 0x52, 0x57}
    if len(data) < 8 {
        return false
    }
    return bytes.Equal(data[:8], signature)
}