Introduced

nativeMemUtils.getByteArray
and
    nativeMemUtils.putByteArray
for faster memory copy.

Interop/Runtime/src/jvm/kotlin/kotlinx/cinterop/JvmNativeMem.kt

@@ -48,6 +48,18 @@ object nativeMemUtils {
         DataModel._64BIT -> putLong(mem, value)
     }
 
+    fun getByteArray(source: NativePointed, dest: ByteArray, length: Int) {
+        val clazz = ByteArray::class.java
+        val baseOffset = unsafe.arrayBaseOffset(clazz).toLong();
+        unsafe.copyMemory(null, source.address, dest, baseOffset, length.toLong())
+    }
+
+    fun putByteArray(source: ByteArray, dest: NativePointed, length: Int) {
+        val clazz = ByteArray::class.java
+        val baseOffset = unsafe.arrayBaseOffset(clazz).toLong();
+        unsafe.copyMemory(source, baseOffset, null, dest.address, length.toLong())
+    }
+
     internal class NativeAllocated(override val rawPtr: NativePtr) : NativePointed
 
     fun alloc(size: Long, align: Int): NativePointed {
@@ -67,4 +79,4 @@ object nativeMemUtils {
         isAccessible = true
         return@with this.get(null) as Unsafe
     }
-}
+}

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/HashUtils.kt

@@ -41,7 +41,9 @@ public fun base64Decode(encoded: String): ByteArray {
         val errorCode = DecodeBase64(encoded, encoded.length, result[0].ptr, resultSize[0].ptr)
         if (errorCode != 0) throw Error("Non-zero exit code of DecodeBase64: ${errorCode}")
         val realSize = resultSize[0].value!!
-        return ByteArray(realSize, {i -> result[i].value!!})
+        val bytes = ByteArray(realSize)
+        nativeMemUtils.getByteArray(result[0], bytes, realSize)
+        return bytes
     }
 }