Refactor HTTP parser to hold current buffer

sdk/lib/io/http_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 _HttpHeaders implements HttpHeaders {
   _HttpHeaders() : _headers = new Map<String, List<String>>();
 
   List<String> operator[](String name) {
     name = name.toLowerCase();
     return _headers[name];
@@ skipping 1289 matching lines @@
 
   void _onData() {
     int available = _socket.available();
     if (available == 0) {
       return;
     }
 
     List<int> buffer = new Uint8List(available);
     int bytesRead = _socket.readList(buffer, 0, available);
     if (bytesRead > 0) {
-      int parsed = _httpParser.writeList(buffer, 0, bytesRead);
-      if (!_httpParser.upgrade) {
-        if (parsed != bytesRead) {
-          if (_socket != null) {
-            // TODO(sgjesse): Error handling.
-            _destroy();
-          }
-        }
-      }
+      _httpParser.writeList(buffer, 0, bytesRead);
     }
   }
 
   void _onClosed() {
     _closing = true;
     _onConnectionClosed(null);
   }
 
   void _onError(e) {
     // If an error occurs, make sure to close the socket if one is associated.
     _error = true;
     if (_socket != null) {
       _socket.close();
     }
     _onConnectionClosed(e);
   }
 
   DetachedSocket _detachSocket() {
     _socket.onData = null;
     _socket.onClosed = null;
     _socket.onError = null;
     _socket.outputStream.onNoPendingWrites = null;
     Socket socket = _socket;
     _socket = null;
     if (onDetach != null) onDetach();
-    return new _DetachedSocket(socket, _httpParser.unparsedData);
+    return new _DetachedSocket(socket, _httpParser.readUnparsedData());
   }
 
   HttpConnectionInfo get connectionInfo {
     if (_socket == null || _closing || _error) return null;
     try {
       _HttpConnectionInfo info = new _HttpConnectionInfo();
       info.remoteHost = _socket.remoteHost;
       info.remotePort = _socket.remotePort;
       info.localPort = _socket.port;
       return info;
@@ skipping 1305 matching lines @@
 
 
 class _RedirectInfo implements RedirectInfo {
   const _RedirectInfo(int this.statusCode,
                       String this.method,
                       Uri this.location);
   final int statusCode;
   final String method;
   final Uri location;
 }