public CurlResponseHeaderReader(IntPtr buffer, ulong size)
{
Debug.Assert(buffer != IntPtr.Zero);
Debug.Assert(size <= int.MaxValue);
_span = new HeaderBufferSpan(buffer, (int)size).Trim();
}
public bool ReadStatusLine(HttpResponseMessage response)
{
if (!_span.StartsWithHttpPrefix())
{
return(false);
}
int index = HttpPrefix.Length;
int majorVersion = _span.ReadInt(ref index);
CheckResponseMsgFormat(majorVersion != 0);
CheckResponseMsgFormat(index < _span.Length && _span[index] == '.');
index++;
// Need minor version.
CheckResponseMsgFormat(index < _span.Length && _span[index] >= '0' && _span[index] <= '9');
int minorVersion = _span.ReadInt(ref index);
CheckResponseMsgFormat(_span.SkipSpace(ref index));
// Parse status code.
int statusCode = _span.ReadInt(ref index);
CheckResponseMsgFormat(statusCode >= 100 && statusCode < 600);
bool foundSpace = _span.SkipSpace(ref index);
CheckResponseMsgFormat(index <= _span.Length);
CheckResponseMsgFormat(foundSpace || index == _span.Length);
// Set the response HttpVersion.
response.Version =
(majorVersion == 1 && minorVersion == 1) ? HttpVersion.Version11 :
(majorVersion == 1 && minorVersion == 0) ? HttpVersion.Version10 :
(majorVersion == 2 && minorVersion == 0) ? HttpVersion.Version20 :
HttpVersion.Unknown;
response.StatusCode = (HttpStatusCode)statusCode;
// Try to use a known reason phrase instead of allocating a new string.
HeaderBufferSpan reasonPhraseSpan = _span.Substring(index);
string knownReasonPhrase = HttpStatusDescription.Get(response.StatusCode);
response.ReasonPhrase = reasonPhraseSpan.EqualsOrdinal(knownReasonPhrase) ?
knownReasonPhrase :
reasonPhraseSpan.ToString();
return(true);
}
public bool ReadHeader(out string headerName, out string headerValue)
{
int index = 0;
while (index < _span.Length && ValidHeaderNameChar(_span[index]))
{
index++;
}
if (index > 0)
{
// For compatability, skip past any whitespace before the colon, even though
// the RFC suggests there shouldn't be any.
int headerNameLength = index;
while (index < _span.Length && IsWhiteSpaceLatin1(_span[index]))
{
index++;
}
CheckResponseMsgFormat(index < _span.Length);
CheckResponseMsgFormat(_span[index] == ':');
HeaderBufferSpan headerNameSpan = _span.Substring(0, headerNameLength);
if (!HttpKnownHeaderNames.TryGetHeaderName(_span.Buffer, _span.Length, out headerName))
{
headerName = headerNameSpan.ToString();
}
CheckResponseMsgFormat(headerName.Length > 0);
index++;
headerValue = _span.Substring(index).Trim().ToString();
return(true);
}
headerName = null;
headerValue = null;
return(false);
}