【HttpModule压缩】Asp.net使用HttpModule压缩并删除空白Html请求的实现代码

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Asp.net使用HttpModule压缩并删除空白Html请求的实现代码

/// <summary>
/// CompressWhitespaceFilter
/// </summary>
public class CompressWhitespaceFilter : Stream
{
private GZipStream _contentGZipStream;
private DeflateStream _content_DeflateStream;
private Stream _contentStream;
private CompressOptions _compressOptions;
/// <summary>
/// Initializes a new instance of the <see cref="CompressWhitespaceFilter"/> class.
/// </summary>
/// <param name="contentStream">The content stream.</param>
/// <param name="compressOptions">The compress options.</param>
public CompressWhitespaceFilter(Stream contentStream, CompressOptions compressOptions)
{
if (compressOptions==CompressOptions.GZip)
{
this._contentGZipStream=new GZipStream(contentStream, CompressionMode.Compress);
this._contentStream=this._contentGZipStream;
}
else if (compressOptions==CompressOptions.Deflate)
{
this._content_DeflateStream=new DeflateStream(contentStream,CompressionMode.Compress);
this._contentStream=this._content_DeflateStream;
}
else
{
this._contentStream=contentStream;
}
this._compressOptions=compressOptions;
}
public override bool CanRead
{
get { return this._contentStream.CanRead; }
}
public override bool CanSeek
{
get { return this._contentStream.CanSeek; }
}
public override bool CanWrite
{
get { return this._contentStream.CanWrite; }
}
public override void Flush()
{
this._contentStream.Flush();
}
public override long Length
{
get { return this._contentStream.Length; }
}
public override long Position
{
get
{
return this._contentStream.Position;
}
set
{
this._contentStream.Position=value;
}
}
public override int Read(byte[] buffer, int offset, int count)
{
return this._contentStream.Read(buffer, offset, count);
}
public override long Seek(long offset, SeekOrigin origin)
{
return this._contentStream.Seek(offset, origin);
}
public override void SetLength(long value)
{
this._contentStream.SetLength(value);
}
public override void Write(byte[] buffer, int offset, int count)
{
byte[] data=new byte[count + 1];
Buffer.BlockCopy(buffer, offset, data, 0, count);
string strtext=System.Text.Encoding.UTF8.GetString(data);
strtext=Regex.Replace(strtext, "^\\s*", string.Empty, RegexOptions.Compiled | RegexOptions.Multiline);
strtext=Regex.Replace(strtext, "\\r\\n", string.Empty, RegexOptions.Compiled | RegexOptions.Multiline);
strtext=Regex.Replace(strtext, "<!--*.*?-->", string.Empty, RegexOptions.Compiled | RegexOptions.Multiline);
byte[] outdata=System.Text.Encoding.UTF8.GetBytes(strtext);
this._contentStream.Write(outdata, 0, outdata.GetLength(0));
}
}
/// <summary>
/// CompressOptions
/// </summary>
/// <seealso cref="http://en.wikipedia.org/wiki/Zcat#gunzip_and_zcat"/>
/// <seealso cref="http://en.wikipedia.org/wiki/DEFLATE"/>
public enum CompressOptions
{
GZip,
Deflate,
None
}

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