initial: varing and smarting packing tools

src/commonMain/kotlin/net.sergeych.bintools/DataSink.kt

@@ -0,0 +1,27 @@
+package net.sergeych.bintools
+
+abstract class DataSink {
+
+    abstract fun writeByte(data: Byte)
+
+    fun writeByte(data: Int) = writeByte(data.toByte())
+
+    open fun writeUByte(data: UByte) {
+        writeByte(data.toByte())
+    }
+
+    @Suppress("unused")
+    open fun writeBytes(data: ByteArray) {
+        for(d in data) writeByte(d)
+    }
+}
+
+class ArrayDataSink : DataSink() {
+    private val result = mutableListOf<Byte>()
+
+    override fun writeByte(data: Byte) {
+        result.add(data)
+    }
+
+    fun toByteArray() = result.toByteArray()
+}