Use ByteArray's native for Socket and File.

tests/standalone/src/ByteArrayTest.dart

+// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+//
+// Dart test program for testing native byte arrays.
+
+void testCreateByteArray() {
+  ByteArray byteArray;
+
+  byteArray = new ByteArray(0);
+  Expect.equals(0, byteArray.length);
+
+  byteArray = new ByteArray(10);
+  Expect.equals(10, byteArray.length);
+  for (int i = 0; i < 10; i++) {
+    Expect.equals(0, byteArray[i]);
+  }
+}
+
+void testSetRange() {
+  ByteArray byteArray = new ByteArray(3);
+
+  List<int> list = [10, 11, 12];
+  byteArray.setRange(0, 3, list);
+  for (int i = 0; i < 3; i++) {
+    Expect.equals(10 + i, byteArray[i]);
+  }
+
+  byteArray[0] = 20;
+  byteArray[1] = 21;
+  byteArray[2] = 22;
+  list.setRange(0, 3, byteArray);
+  for (int i = 0; i < 3; i++) {
+    Expect.equals(20 + i, list[i]);
+  }
+
+  byteArray.setRange(1, 2, const [8, 9]);
+  Expect.equals(20, byteArray[0]);
+  Expect.equals(8, byteArray[1]);
+  Expect.equals(9, byteArray[2]);
+}
+
+void testIndexOutOfRange() {
+  ByteArray byteArray = new ByteArray(3);
+  List<int> list = const [0, 1, 2, 3];
+
+  Expect.throws(() {
+    byteArray.setRange(0, 4, list);
+  });
+
+  Expect.throws(() {
+    byteArray.setRange(3, 1, list);
+  });
+}
+
+main() {
+  testCreateByteArray();
+  testSetRange();
+  testIndexOutOfRange();
+}