State?ReadHeaders(IByteBuffer buffer)
{
IHttpMessage httpMessage = _message;
HttpHeaders headers = httpMessage.Headers;
AppendableCharSequence line = _headerParser.Parse(buffer);
if (line is null)
{
return(null);
}
// ReSharper disable once ConvertIfDoToWhile
if ((uint)line.Count > 0u)
{
do
{
byte firstChar = line.Bytes[0];
if (_name is object && (firstChar == c_space || firstChar == c_tab))
{
//please do not make one line from below code
//as it breaks +XX:OptimizeStringConcat optimization
ICharSequence trimmedLine = CharUtil.Trim(line);
_value = new AsciiString($"{_value} {trimmedLine}");
}
else
{
if (_name is object)
{
_ = headers.Add(_name, _value);
}
SplitHeader(line);
}
line = _headerParser.Parse(buffer);
if (line is null)
{
return(null);
}
} while ((uint)line.Count > 0u);
}
// Add the last header.
if (_name is object)
{
_ = headers.Add(_name, _value);
}
// reset name and value fields
_name = null;
_value = null;
var values = headers.GetAll(HttpHeaderNames.ContentLength);
uint contentLengthValuesCount = (uint)values.Count;
if (contentLengthValuesCount > 0u)
{
// Guard against multiple Content-Length headers as stated in
// https://tools.ietf.org/html/rfc7230#section-3.3.2:
//
// If a message is received that has multiple Content-Length header
// fields with field-values consisting of the same decimal value, or a
// single Content-Length header field with a field value containing a
// list of identical decimal values (e.g., "Content-Length: 42, 42"),
// indicating that duplicate Content-Length header fields have been
// generated or combined by an upstream message processor, then the
// recipient MUST either reject the message as invalid or replace the
// duplicated field-values with a single valid Content-Length field
// containing that decimal value prior to determining the message body
// length or forwarding the message.
if (contentLengthValuesCount > 1u && httpMessage.ProtocolVersion == HttpVersion.Http11)
{
ThrowHelper.ThrowArgumentException_Multiple_Content_Length_Headers_Found();
}
if (!long.TryParse(values[0].ToString(), out _contentLength))
{
ThrowHelper.ThrowArgumentException_Invalid_Content_Length();
}
}
if (IsContentAlwaysEmpty(httpMessage))
{
HttpUtil.SetTransferEncodingChunked(httpMessage, false);
return(State.SkipControlChars);
}
else if (HttpUtil.IsTransferEncodingChunked(httpMessage))
{
if (contentLengthValuesCount > 0u && httpMessage.ProtocolVersion == HttpVersion.Http11)
{
HandleTransferEncodingChunkedWithContentLength(httpMessage);
}
return(State.ReadChunkSize);
}
else if (ContentLength() >= 0L)
{
return(State.ReadFixedLengthContent);
}
else
{
return(State.ReadVariableLengthContent);
}
}
