Clean up file implementation.

runtime/bin/socket_impl.dart

 // 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.
 
 
 class _SocketBase extends NativeFieldWrapperClass1 {
   // Bit flags used when communicating between the eventhandler and
   // dart code. The EVENT flags are used to indicate events of
   // interest when sending a message from dart code to the
   // eventhandler. When receiving a message from the eventhandler the
@@ skipping 189 matching lines @@
     }
 
     // For all errors we close the socket, call the error handler and
     // disable further calls of the error handler.
     close();
     if (error is OSError) {
       doReportError(new SocketIOException(message, error));
     } else if (error is List) {
       assert(_isErrorResponse(error));
       switch (error[0]) {
-        case _FileUtils.ILLEGAL_ARGUMENT_RESPONSE:
+        case _ILLEGAL_ARGUMENT_RESPONSE:
           doReportError(new ArgumentError());
           break;
-        case _FileUtils.OSERROR_RESPONSE:
+        case _OSERROR_RESPONSE:
           doReportError(new SocketIOException(
               message, new OSError(error[2], error[1])));
           break;
         default:
           doReportError(new Exception("Unknown error"));
           break;
       }
     } else {
       doReportError(new SocketIOException(message));
     }
@@ skipping 177 matching lines @@
       }
       if (offset < 0) {
         throw new IndexOutOfRangeException(offset);
       }
       if (bytes < 0) {
         throw new IndexOutOfRangeException(bytes);
       }
       if ((offset + bytes) > buffer.length) {
         throw new IndexOutOfRangeException(offset + bytes);
       }
-      var fastBuffer = _ensureFastAndSerializableBuffer(buffer, offset, bytes);
-      var result = _writeList(fastBuffer[0], fastBuffer[1], bytes);
+      _BufferAndOffset bufferAndOffset =
+          _ensureFastAndSerializableBuffer(buffer, offset, bytes);
+      var result =
+          _writeList(bufferAndOffset.buffer, bufferAndOffset.offset, bytes);
       if (result is OSError) {
         _reportError(result, "Write failed");
         // If writing fails we return 0 as the number of bytes and
         // report the error on the error handler.
         result = 0;
       }
       return result;
     }
     throw new SocketIOException("writeList failed - invalid socket handle");
   }
 
   _writeList(List<int> buffer, int offset, int bytes)
       native "Socket_WriteList";
 
   bool _isErrorResponse(response) {
-    return response is List && response[0] != _FileUtils.SUCCESS_RESPONSE;
+    return response is List && response[0] != _SUCCESS_RESPONSE;
   }
 
   bool _createConnect(String host, int port) native "Socket_CreateConnect";
 
   void set onWrite(void callback()) {
     if (_outputStream != null) throw new StreamException(
             "Cannot set write handler when output stream is used");
     _clientWriteHandler = callback;
     _updateOutHandler();
   }
@@ skipping 132 matching lines @@
   bool _seenFirstOutEvent = false;
   bool _pipe = false;
   Function _clientConnectHandler;
   Function _clientWriteHandler;
   SocketInputStream _inputStream;
   SocketOutputStream _outputStream;
   String _remoteHost;
   int _remotePort;
   static SendPort _socketService;
 }