private bool Negotiate(string offer, Func <AgreedExtensionParameter, bool> agree, out string invalidParameter, out IWebSocketExtension negotiatedExtension)
{
invalidParameter = null;
negotiatedExtension = null;
if (string.IsNullOrWhiteSpace(offer))
{
invalidParameter = offer;
return(false);
}
var segements = offer.Replace('\r', ' ').Replace('\n', ' ').TrimStart(TrimableChars).TrimEnd(TrimableChars).Split(';');
var offeredExtensionName = segements[0].TrimStart(TrimableChars).TrimEnd(TrimableChars);
if (string.IsNullOrEmpty(offeredExtensionName))
{
invalidParameter = offer;
return(false);
}
if (string.Compare(offeredExtensionName, PerMessageCompressionExtension.RegisteredToken, StringComparison.OrdinalIgnoreCase) != 0)
{
invalidParameter = offeredExtensionName;
return(false);
}
if (segements.Length == 1)
{
negotiatedExtension = new PerMessageCompressionExtension();
return(true);
}
// This set of elements MAY include multiple PMCEs with the same extension
// name to offer the possibility to use the same algorithm with
// different configuration parameters.
for (int i = 1; i < segements.Length; i++)
{
var offeredParameter = segements[i];
if (!PerMessageCompressionExtensionParameters.ValidateParameter(offeredParameter))
{
invalidParameter = offeredParameter;
return(false);
}
}
// The order of elements is important as it specifies the client's preference.
// An element preceding another element has higher preference. It is recommended
// that a server accepts PMCEs with higher preference if the server supports them.
var agreedSet = new SortedList <int, AgreedExtensionParameter>();
for (int i = 1; i < segements.Length; i++)
{
var offeredParameter = segements[i];
var agreeingParameter = PerMessageCompressionExtensionParameters.ResolveParameter(offeredParameter);
if (agree(agreeingParameter))
{
agreedSet.Add(i, agreeingParameter);
}
}
negotiatedExtension = new PerMessageCompressionExtension(agreedSet);
return(true);
}
private bool Negotiate(string offer, Func<AgreedExtensionParameter, bool> agree, out string invalidParameter, out IWebSocketExtension negotiatedExtension)
{
invalidParameter = null;
negotiatedExtension = null;
if (string.IsNullOrWhiteSpace(offer))
{
invalidParameter = offer;
return false;
}
var segements = offer.Replace('\r', ' ').Replace('\n', ' ').TrimStart(TrimableChars).TrimEnd(TrimableChars).Split(';');
var offeredExtensionName = segements[0].TrimStart(TrimableChars).TrimEnd(TrimableChars);
if (string.IsNullOrEmpty(offeredExtensionName))
{
invalidParameter = offer;
return false;
}
if (string.Compare(offeredExtensionName, PerMessageCompressionExtension.RegisteredToken, StringComparison.OrdinalIgnoreCase) != 0)
{
invalidParameter = offeredExtensionName;
return false;
}
if (segements.Length == 1)
{
negotiatedExtension = new PerMessageCompressionExtension();
return true;
}
// This set of elements MAY include multiple PMCEs with the same extension
// name to offer the possibility to use the same algorithm with
// different configuration parameters.
for (int i = 1; i < segements.Length; i++)
{
var offeredParameter = segements[i];
if (!PerMessageCompressionExtensionParameters.ValidateParameter(offeredParameter))
{
invalidParameter = offeredParameter;
return false;
}
}
// The order of elements is important as it specifies the client's preference.
// An element preceding another element has higher preference. It is recommended
// that a server accepts PMCEs with higher preference if the server supports them.
var agreedSet = new SortedList<int, AgreedExtensionParameter>();
for (int i = 1; i < segements.Length; i++)
{
var offeredParameter = segements[i];
var agreeingParameter = PerMessageCompressionExtensionParameters.ResolveParameter(offeredParameter);
if (agree(agreeingParameter))
{
agreedSet.Add(i, agreeingParameter);
}
}
negotiatedExtension = new PerMessageCompressionExtension(agreedSet);
return true;
}
