Start reading data from sockets directly into external byte arrays

lib/io/socket_stream_impl.dart

Index: lib/io/socket_stream_impl.dart
diff --git a/lib/io/socket_stream_impl.dart b/lib/io/socket_stream_impl.dart
index e56334c5c94732045a734f20ab211a9aafe2a6da..c8799b1ba7da7cf9d22d21f7e669890ec83a09bd 100644
--- a/lib/io/socket_stream_impl.dart
+++ b/lib/io/socket_stream_impl.dart
@@ -9,30 +9,7 @@ class _SocketInputStream implements InputStream {
   }
 
   List<int> read([int len]) {
-    int bytesToRead = available();
-    if (bytesToRead == 0) return null;
-    if (len !== null) {
-      if (len <= 0) {
-        throw new StreamException("Illegal length $len");
-      } else if (bytesToRead > len) {
-        bytesToRead = len;
-      }
-    }
-    List<int> buffer = new Uint8List(bytesToRead);
-    int bytesRead = _socket.readList(buffer, 0, bytesToRead);
-    if (bytesRead == 0) {
-      // On MacOS when reading from a tty Ctrl-D will result in one
-      // byte reported as available. Attempting to read it out will
-      // result in zero bytes read. When that happens there is no data
-      // which is indicated by a null return value.
-      return null;
-    } else if (bytesRead < bytesToRead) {
-      List<int> newBuffer = new Uint8List(bytesRead);
-      newBuffer.setRange(0, bytesRead, buffer);
-      return newBuffer;
-    } else {
-      return buffer;
-    }
+    return _socket.read(len);
   }
 
   int readInto(List<int> buffer, [int offset = 0, int len]) {