initial commit

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

@@ -0,0 +1,49 @@
+package com.infendro.bytearray
+
+import com.infendro.bytearray.ByteOrder.BIG_ENDIAN
+
+fun ULong.toByteArray(
+    order: ByteOrder = BIG_ENDIAN,
+): ByteArray {
+    val bytes = ByteArray(8) { i ->
+        val offset = (7 - i) * 8
+        (this shr offset).toByte()
+    }
+    return order.normalize(bytes)
+}
+
+fun ByteArray.toULong(
+    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)
+    }
+}
+
+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)
+}