IBM (.ibm)

def is_ibm(file_path: str) -> bool:
    """Check if file is a valid IBM by magic bytes."""
    signature = bytes([0x46, 0x4F, 0x52, 0x4D, 0x49, 0x4C, 0x42, 0x4D])
    with open(file_path, "rb") as f:
        return f.read(8) == signature

function isIBM(buffer: Buffer): boolean {
  const signature = Buffer.from([0x46, 0x4F, 0x52, 0x4D, 0x49, 0x4C, 0x42, 0x4D]);
  return buffer.subarray(0, 8).equals(signature);
}

func IsIBM(data []byte) bool {
    signature := []byte{0x46, 0x4F, 0x52, 0x4D, 0x49, 0x4C, 0x42, 0x4D}
    if len(data) < 8 {
        return false
    }
    return bytes.Equal(data[:8], signature)
}