Initial commit

src/nativeMain/kotlin/Main.kt

@@ -1,3 +1,31 @@
-fun main() {
-    println("Hello, Kotlin/Native!")
+import kotlin.random.Random
+import kotlinx.datetime.Clock
+
+private val NOW = Clock.System.now()
+private val epochSeconds: Long = NOW.epochSeconds
+private val nanos: Int = NOW.nanosecondsOfSecond
+private const val VERSION: Long = 7
+private fun getSequence(): Int =
+    TODO("No bits reserved to avoid clashes between UUIDs generated on the same nanosecond with the same random bits")
+
+//private fun getRandom(): Long = Random.nextLong(0x10000000000) // 40 bits if sequence bits were generated
+private val random: Long = Random.nextLong(0x1000000000000) // 48 bits
+
+private fun Int.getFirstChunk() = (((this shr 14) shr 12) and 0xfff).toLong()
+private fun Int.getSecondChunk() = ((this shr 14) and 0xfff).toLong()
+private fun Int.getThirdChunk() = (this and 0x3fff).toLong()
+
+fun main(args: Array<String>) {
+
+    val unixTs = epochSeconds
+
+    val uuid = setOf(
+        (unixTs shr 4).toString(16).padStart(8, '0'),
+        ((unixTs and 0b1111 shl 12) + nanos.getFirstChunk()).toString(16).padStart(4, '0'),
+        ((VERSION shl 12) + nanos.getSecondChunk()).toString(16).padStart(4, '0'),
+        nanos.getThirdChunk().toString(16).padStart(4, '0'),
+        random.toString(16).padStart(12, '0')
+    )
+
+    println(uuid.joinToString("-"))
 }