Improve parsing of query string

sdk/lib/io/http_parser.dart

 // Copyright (c) 2013, 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.
 
 part of dart.io;
 
 // Global constants.
 class _Const {
   // Bytes for "HTTP".
   static const HTTP = const [72, 84, 84, 80];
@@ skipping 16 matching lines @@
                                              32, 9, 13, 10];
 }
 
 
 // Frequently used character codes.
 class _CharCode {
   static const int HT = 9;
   static const int LF = 10;
   static const int CR = 13;
   static const int SP = 32;
+  static const int AMPERSAND = 38;
   static const int COMMA = 44;
   static const int DASH = 45;
   static const int SLASH = 47;
   static const int ZERO = 48;
   static const int ONE = 49;
   static const int COLON = 58;
   static const int SEMI_COLON = 59;
+  static const int EQUAL = 61;
 }
 
 
 // States of the HTTP parser state machine.
 class _State {
   static const int START = 0;
   static const int METHOD_OR_RESPONSE_HTTP_VERSION = 1;
   static const int RESPONSE_HTTP_VERSION = 2;
   static const int REQUEST_LINE_METHOD = 3;
   static const int REQUEST_LINE_URI = 4;
@@ skipping 908 matching lines @@
   StreamController<_HttpIncoming> _controller;
   StreamController<List<int>> _bodyController;
 }
 
 
 class HttpParserException implements Exception {
   const HttpParserException([String this.message = ""]);
   String toString() => "HttpParserException: $message";
   final String message;
 }