magicajax-0.3.0-source/Core/PageFilter.cs

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#region LGPL License
/*
MagicAjax.NET Framework
Copyright (C) 2005  MagicAjax Project Team

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#endregion

using System;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;

namespace MagicAjax
{
	/// <summary>
	/// Used to store and retrieve the html rendering of the page during an AjaxCall
	/// </summary>
	internal class PageFilter : Stream
	{
		private Stream _responseStream;
		private Stream _memStream;
		private MagicAjaxContext _magicAjaxContext;

		public PageFilter(Stream _responseStream)
		{
			this._responseStream = _responseStream;
			this._memStream = new MemoryStream();
			this._magicAjaxContext = MagicAjaxContext.Current;
		}

		public string GetViewStateFieldValue()
		{
			//TODO: use regular expression (much faster)
#if NET_2_0
			string search = "<input type=\"hidden\" name=\"__VIEWSTATE\" id=\"__VIEWSTATE\" value=\"";
#else
			string search = "<input type=\"hidden\" name=\"__VIEWSTATE\" value=\"";
#endif
			string html = GetHtmlPage();
			int si = html.IndexOf(search);
			if (si == -1)
				return null;

			si += search.Length;
			int ei = html.IndexOf('\"', si);