missing initial files + publishing

src/commonMain/kotlin/net/sergeych/utools/packing.kt

@@ -0,0 +1,46 @@
+package net.sergeych.utools
+
+import kotlinx.serialization.KSerializer
+import kotlinx.serialization.serializer
+import net.sergeych.bintools.toDataSource
+import net.sergeych.bipack.BipackDecoder
+import net.sergeych.bipack.BipackEncoder
+
+/**
+ * Effectively pack anyk nullable object. The result could be effectively packed
+ * in turn as a part of a more complex structure.
+ *
+ * To avoid packing non-null mark,
+ * we use a zero-size array, which, if in turn encoded, packs into a single
+ * zero byte. Thus, we avoid extra byte spending for unnecessary null
+ * check.
+ */
+inline fun <reified T> pack(element: T?): UByteArray = pack(serializer<T>(), element)
+
+/**
+ * Unpack nullable data packed with [pack]
+ */
+inline fun <reified T: Any?> unpack(encoded: UByteArray): T =
+    unpack(serializer<T>(), encoded)
+
+/**
+ * Effectively pack anyk nullable object. The result could be effectively packed
+ * in turn as a part of a more complex structure.
+ *
+ * To avoid packing non-null mark,
+ * we use a zero-size array, which, if in turn encoded, packs into a single
+ * zero byte. Thus, we avoid extra byte spending for unnecessary null
+ * check.
+ */
+fun <T>pack(serializer: KSerializer<T>, element: T?): UByteArray =
+    if (element == null) ubyteArrayOf()
+    else BipackEncoder.encode(serializer,element).toUByteArray()
+
+
+/**
+ * Unpack nullable data packed with [pack]
+ */
+@Suppress("UNCHECKED_CAST")
+fun <T: Any?> unpack(serializer: KSerializer<T>, encoded: UByteArray): T =
+    if (encoded.isEmpty()) null as T
+    else BipackDecoder.decode(encoded.toByteArray().toDataSource(),serializer)