/// <summary>
/// Creates new instance of <see cref="WebSocketDeflateCompressionProvider"/>
/// </summary>
/// <param name="compressionOptions">The compression options.</param>
/// <param name="sendSegmentSize">The maximum size of single segment which will be sent over the WebSocket connection.</param>
/// <returns>New instance of <see cref="WebSocketDeflateCompressionProvider"/> or NULL if provided options are not supported.</returns>
public static WebSocketDeflateCompressionProvider Create(WebSocketDeflateCompressionOptions compressionOptions, int?sendSegmentSize = null)
{
if (compressionOptions.ServerMaxWindowBits.HasValue)
{
return(null);
}
compressionOptions.ClientNoContextTakeover = true;
return(new WebSocketDeflateCompressionProvider(compressionOptions, sendSegmentSize));
}
/// <summary>
/// Creates new instance of <see cref="WebSocketDeflateCompressionOptions"/> from header value.
/// </summary>
/// <param name="headerValue">The header value.</param>
/// <returns>New instance of <see cref="WebSocketDeflateCompressionOptions"/>.</returns>
public static WebSocketDeflateCompressionOptions FromHeaderValue(NameValueWithParametersHeaderValue headerValue)
{
WebSocketDeflateCompressionOptions compressionOptions = new WebSocketDeflateCompressionOptions();
foreach (NameValueHeaderValue parameterValue in headerValue.Parameters)
{
switch (parameterValue.Name.ToLowerInvariant())
{
case SERVER_NO_CONTEXT_TAKEOVER_OPTION:
compressionOptions = SetAndEnsureServerNoContextTakeover(compressionOptions);
break;
case CLIENT_NO_CONTEXT_TAKEOVER_OPTION:
compressionOptions = SetAndEnsureClientNoContextTakeover(compressionOptions);
break;
case SERVER_MAX_WINDOW_BITS_OPTION:
compressionOptions = SetAndEnsureServerMaxWindowBits(compressionOptions, parameterValue.Value);
break;
case CLIENT_MAX_WINDOW_BITS_OPTION:
compressionOptions = SetAndEnsureClientMaxWindowBits(compressionOptions, parameterValue.Value);
break;
default:
compressionOptions = null;
break;
}
if (compressionOptions == null)
{
break;
}
}
return(compressionOptions);
}
private WebSocketDeflateCompressionProvider(WebSocketDeflateCompressionOptions compressionOptions, int?sendSegmentSize)
: base(sendSegmentSize)
{
_compressionOptions = compressionOptions;
}
private static WebSocketDeflateCompressionOptions SetAndEnsureClientMaxWindowBits(WebSocketDeflateCompressionOptions compressionOptions, string clientMaxWindowBitsValue)
{
int clientMaxWindowBits = ClientMaxWindowBitsWithoutValue;
if (compressionOptions.ClientMaxWindowBits.HasValue || (!String.IsNullOrEmpty(clientMaxWindowBitsValue) && TryParseMaxWindowBits(clientMaxWindowBitsValue, out clientMaxWindowBits)))
{
compressionOptions = null;
}
else
{
compressionOptions.ClientMaxWindowBits = clientMaxWindowBits;
}
return(compressionOptions);
}
private static WebSocketDeflateCompressionOptions SetAndEnsureServerMaxWindowBits(WebSocketDeflateCompressionOptions compressionOptions, string serverMaxWindowBitsValue)
{
int serverMaxWindowBits;
if (compressionOptions.ServerMaxWindowBits.HasValue || !TryParseMaxWindowBits(serverMaxWindowBitsValue, out serverMaxWindowBits))
{
compressionOptions = null;
}
else
{
compressionOptions.ServerMaxWindowBits = serverMaxWindowBits;
}
return(compressionOptions);
}
private static WebSocketDeflateCompressionOptions SetAndEnsureClientNoContextTakeover(WebSocketDeflateCompressionOptions compressionOptions)
{
if (compressionOptions.ClientNoContextTakeover)
{
compressionOptions = null;
}
else
{
compressionOptions.ClientNoContextTakeover = true;
}
return(compressionOptions);
}