private bool EncodeDynamicHeader(Span <byte> buffer, int staticTableIndex, string name, string value,
int headerLength, Encoding?valueEncoding, out int bytesWritten)
{
EncoderHeaderEntry?headerField = GetEntry(name, value);
if (headerField != null)
{
// Already exists in dynamic table. Write index.
int index = CalculateDynamicTableIndex(headerField.Index);
return(HPackEncoder.EncodeIndexedHeaderField(index, buffer, out bytesWritten));
}
else
{
// Doesn't exist in dynamic table. Add new entry to dynamic table.
int index = ResolveDynamicTableIndex(staticTableIndex, name);
bool success = index == -1
? HPackEncoder.EncodeLiteralHeaderFieldIndexingNewName(name, value, valueEncoding, buffer, out bytesWritten)
: HPackEncoder.EncodeLiteralHeaderFieldIndexing(index, value, valueEncoding, buffer, out bytesWritten);
if (success)
{
uint headerSize = (uint)headerLength;
EnsureCapacity(headerSize);
AddHeaderEntry(name, value, headerSize);
}
return(success);
}
}
public bool EncodeHeader(Span <byte> buffer, int staticTableIndex, HeaderEncodingHint encodingHint, string name, string value, out int bytesWritten)
{
Debug.Assert(!_pendingTableSizeUpdate, "Dynamic table size update should be encoded before headers.");
// Never index sensitive value.
if (encodingHint == HeaderEncodingHint.NeverIndex)
{
int index = ResolveDynamicTableIndex(staticTableIndex, name);
return(index == -1
? HPackEncoder.EncodeLiteralHeaderFieldNeverIndexingNewName(name, value, buffer, out bytesWritten)
: HPackEncoder.EncodeLiteralHeaderFieldNeverIndexing(index, value, buffer, out bytesWritten));
}
// No dynamic table. Only use the static table.
if (!_allowDynamicCompression || _maxHeaderTableSize == 0 || encodingHint == HeaderEncodingHint.IgnoreIndex)
{
return(staticTableIndex == -1
? HPackEncoder.EncodeLiteralHeaderFieldWithoutIndexingNewName(name, value, buffer, out bytesWritten)
: HPackEncoder.EncodeLiteralHeaderFieldWithoutIndexing(staticTableIndex, value, buffer, out bytesWritten));
}
// Header is greater than the maximum table size.
// Don't attempt to add dynamic header as all existing dynamic headers will be removed.
if (HeaderField.GetLength(name.Length, value.Length) > _maxHeaderTableSize)
{
int index = ResolveDynamicTableIndex(staticTableIndex, name);
return(index == -1
? HPackEncoder.EncodeLiteralHeaderFieldWithoutIndexingNewName(name, value, buffer, out bytesWritten)
: HPackEncoder.EncodeLiteralHeaderFieldWithoutIndexing(index, value, buffer, out bytesWritten));
}
return(EncodeDynamicHeader(buffer, staticTableIndex, name, value, out bytesWritten));
}
public bool EnsureDynamicTableSizeUpdate(Span <byte> buffer, out int length)
{
// Check if there is a table size update that should be encoded
if (_pendingTableSizeUpdate)
{
bool success = HPackEncoder.EncodeDynamicTableSizeUpdate((int)_maxHeaderTableSize, buffer, out length);
_pendingTableSizeUpdate = false;
return(success);
}
length = 0;
return(true);
}
