KotlinでUInt, UShortをByteArrayに変換する

リトルエンディアンで、UInt(32bit), UShort(16bit)をByteArrayに変換するコードです。

UInt+.kt

fun UInt.toByteArray(): ByteArray {
    val value = this.toInt()
    val bytes = ByteArray(4)
    bytes[0] = (value and 0xFF).toByte()
    bytes[1] = ((value ushr 8) and 0xFF).toByte()
    bytes[2] = ((value ushr 16) and 0xFF).toByte()
    bytes[3] = ((value ushr 24) and 0xFF).toByte()
    return bytes
}

UShort+.kt

fun UShort.toByteArray(): ByteArray {
    val value = this.toInt()
    val bytes = ByteArray(2)
    bytes[0] = (value and 0xFF).toByte()
    bytes[1] = ((value ushr 8) and 0xFF).toByte()
    return bytes
}