同时我们还可以删除一些空白
段,空行,注释等以使得HTML文档的尺寸变得更小. 让我们先来实现压缩与删除空白类, 继承自Stream类:
代码如下:
/// <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));
