small improvements

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

@@ -1,6 +1,7 @@
 package net.sergeych.bintools
 
 import kotlinx.serialization.Serializable
+import net.sergeych.mp_tools.encodeToBase64Compact
 import kotlin.math.min
 import kotlin.random.Random
 
@@ -64,6 +65,11 @@ class ByteChunk(val data: UByteArray): Comparable<ByteChunk> {
      */
     val dump by lazy { data.toDump() }
 
+    /**
+     * Lazy encode to base64 with url alphabet, without trailing fill '=' characters.
+     */
+    val base64 by lazy { data.asByteArray().encodeToBase64Compact() }
+
     /**
      * Concatenate two chunks and return new one
      */
@@ -75,6 +81,13 @@ class ByteChunk(val data: UByteArray): Comparable<ByteChunk> {
     }
 }
 
+/**
+ * Create the representation of this array as ByteChunk; it does not copy the data.
+ */
 fun ByteArray.asChunk() = ByteChunk(this.asUByteArray())
+
+/**
+ * Create the representation of this array as ByteChunk; it does not copy the data.
+ */
 @Suppress("unused")
 fun UByteArray.asChunk() = ByteChunk(this)