implement padding, support UByteArray

src/commonMain/kotlin/com/infendro/bytearray/ULong.kt

@@ -12,38 +12,12 @@ fun ULong.toByteArray(
     return order.normalize(bytes)
 }
 
-fun ByteArray.toULong(
+fun ULong.toUByteArray(
     order: ByteOrder = BIG_ENDIAN,
-): ULong {
-    if (size != 8) throw Exception()
-
-    val bytes = order.normalize(this)
-    return bytes.fold(0UL) { acc, byte ->
-        (acc shl 8) or (byte.toULong() and 0xFFUL)
+): UByteArray {
+    val bytes = UByteArray(8) { i ->
+        val offset = (7 - i) * 8
+        (this shr offset).toUByte()
     }
-}
-
-fun Collection<Byte>.toULong(
-    order: ByteOrder = BIG_ENDIAN,
-): ULong {
-    return toByteArray()
-        .toULong(order)
-}
-
-fun ByteArray.toULongArray(
-    order: ByteOrder = BIG_ENDIAN,
-): ULongArray {
-    if (size % 8 != 0) throw Exception()
-
-    return toList()
-        .chunked(8)
-        .map { it.toULong(order) }
-        .toULongArray()
-}
-
-fun Collection<Byte>.toULongArray(
-    order: ByteOrder = BIG_ENDIAN,
-): ULongArray {
-    return toByteArray()
-        .toULongArray(order)
+    return order.normalize(bytes)
 }