/// <summary>
/// Returns the index of the best matching element in the header table.
/// If no index was found the return value is -1.
/// If an index was found and the name as well as the value match
/// isFullMatch will be set to true.
/// </summary>
public int GetBestMatchingIndex(HeaderField field, out bool isFullMatch)
{
var bestMatch = -1;
isFullMatch = false;
var i = 1;
foreach (var entry in StaticTable.Entries)
{
if (entry.Name == field.Name)
{
if (bestMatch == -1)
{
// We used the lowest matching field index, which makes
// search for the receiver the most efficient and provides
// the highest chance to use the Static Table.
bestMatch = i;
}
if (entry.Value == field.Value)
{
// It's a perfect match!
isFullMatch = true;
return(i);
}
}
i++;
}
// If we don't have a full match search on in the dynamic table
bool dynamicHasFullMatch;
var di = this.dynamic.GetBestMatchingIndex(field, out dynamicHasFullMatch);
if (dynamicHasFullMatch)
{
isFullMatch = true;
return(di + 1 + StaticTable.Length);
}
// If the dynamic table has a match at all use it's index and normalize it
if (di != -1 && bestMatch == -1)
{
bestMatch = di + 1 + StaticTable.Length;
}
return(bestMatch);
}
/// <summary>
/// Handles the decoding of a fully indexed headerfield
/// </summary>
private void HandleDecodeIndexed()
{
// The index is stored as result of the first task
var idx = this._tasks[0].IntData;
this.Reset();
var tableHeader = this._headerTable.GetAt(idx);
// No need to check for validity here
// The getAt function will already throw if the index is not valid
AllowTableSizeUpdates = false;
Done = true;
HeaderField = new HeaderField
{
Name = tableHeader.Name,
Value = tableHeader.Value,
Sensitive = false
};
HeaderSize = 32 + tableHeader.NameLen + tableHeader.ValueLen;
}
