private int ParseHeader(ReadOnlySpan <byte> data)
{
if (data.Length < 2)
{
return(0);
}
_headers ??= new HttpHeaderCollection();
if (data.ReadShort() == 0x0A0D)
{
State = HttpRequestMessageState.HeadersParsed;
return(2);
}
var offset = data.IndexOf(new[] { ByteCr, ByteLf });
if (offset == -1)
{
return(0);
}
var nameLength = data.IndexOf((byte)':');
if (nameLength == -1)
{
return(0);
}
var name = data.Slice(0, nameLength);
var valueOffset = nameLength + 1;
if (data[valueOffset] == ByteSpace)
{
valueOffset++;
}
var value = data.Slice(valueOffset, offset - valueOffset);
_headers.Add(name.GetAsciiString(), value.GetAsciiString());
return(offset + 2);
}
internal bool ParseStartLineAndHeaders(ReadOnlySpan <byte> data, out int consumed)
{
consumed = 0;
while (State != HttpRequestMessageState.HeadersParsed)
{
var currentConsumed = State switch
{
HttpRequestMessageState.ParsingMethod => ParseMethod(data),
HttpRequestMessageState.ParsingRequestUri => ParseRequestUri(data),
HttpRequestMessageState.ParsingVersion => ParseVersion(data),
HttpRequestMessageState.ParsingHeader => ParseHeader(data),
_ => throw new InvalidOperationException(),
};
if (currentConsumed == 0)
{
return(false);
}
if (State < HttpRequestMessageState.ParsingHeader)
{
State++;
}
consumed += currentConsumed;
data = data.Slice(currentConsumed);
}
Debug.Assert(_headers != null);
if (_headers.TryGetValue("Expect", out var expect) && expect == "100-continue")
{
State = HttpRequestMessageState.HandlingExpect100Continue;
}
else
{
State = HttpRequestMessageState.ReadingBody;
}
return(true);
}
