Start reading data from sockets directly into external byte arrays

runtime/bin/io_buffer.cc

+// Copyright (c) 2012, 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.
+
+#include "bin/io_buffer.h"
+
+static void BufferFree(void* buffer) {
+  delete[] reinterpret_cast<uint8_t*>(buffer);
+}
+
+
+Dart_Handle IOBuffer::Allocate(intptr_t size, uint8_t **buffer) {
+  uint8_t* data = new uint8_t[size];
+  Dart_Handle result = Dart_NewExternalByteArray(data,
+                                                 size,
+                                                 data,
+                                                 BufferFree);
+  if (Dart_IsError(result)) {
+    BufferFree(data);
+    Dart_PropagateError(result);
+  }
+  if (buffer != NULL) {
+    *buffer = data;
+  }
+  return result;
+}