MobiPocket eBook (MOBI) (.prc)

def is_prc(file_path: str) -> bool:
    """Check if file is a valid PRC by magic bytes at offset 60."""
    signature = bytes([0x42, 0x4F, 0x4F, 0x4B, 0x4D, 0x4F, 0x42, 0x49])
    with open(file_path, "rb") as f:
        f.seek(60)
        return f.read(8) == signature

function isPRC(buffer: Buffer): boolean {
  const signature = Buffer.from([0x42, 0x4F, 0x4F, 0x4B, 0x4D, 0x4F, 0x42, 0x49]);
  if (buffer.length < 68) return false;
  return buffer.subarray(60, 68).equals(signature);
}

func IsPRC(data []byte) bool {
    signature := []byte{0x42, 0x4F, 0x4F, 0x4B, 0x4D, 0x4F, 0x42, 0x49}
    if len(data) < 68 {
        return false
    }
    return bytes.Equal(data[60:68], signature)
}