public static void Parse(Stream input, IHttpMessagePrologueParseSink sink)
{
if (input == null)
{
throw new ArgumentNullException(nameof(input));
}
if (sink == null)
{
throw new ArgumentNullException(nameof(sink));
}
if (!input.CanRead)
{
throw new ArgumentException(null, nameof(input));
}
var lineBuilder = new StringBuilder();
string startLine;
do
{
startLine = HttpLine.Read(input, lineBuilder)?.Trim();
if (startLine == null)
{
throw new FormatException("Missing HTTP request line or status response.");
}
}while (startLine.Length == 0);
var match = Regex.Match(startLine, @"^HTTP/(0\.9|[1-9]\.[0-9])\x20+([1-5][0-9]{2})(?:\x20+(.+))?$");
if (match.Success)
{
var groups = match.Groups;
var version = groups[1].Value;
var statusCode = int.Parse(groups[2].Value, NumberStyles.None, CultureInfo.InvariantCulture);
var reasonPhrase = groups[3].Value;
sink.OnResponseLine(version, statusCode, reasonPhrase);
}
else if ((match = Regex.Match(startLine,
@"^([!#$%&""'*.^_`|~0-9A-Za-z+-]+)\x20+([^\x20]+)(?:\x20+HTTP/([1-9]\.[0-9]))?$")).Success)
{
var groups = match.Groups;
var method = groups[1].Value;
var url = groups[2].Value;
var version = groups[3].Success ? groups[3].Value : null;
sink.OnRequestLine(method, url, version);
}
else
{
throw new FormatException("Invalid HTTP request line or status response: " + startLine);
}
foreach (var(name, value) in ReadHeaders(input, lineBuilder))
{
sink.OnHeader(name, value);
}
}
static IEnumerable <KeyValuePair <string, string> > ReadHeaders(Stream input, StringBuilder lineBuilder)
{
string headerName = null;
string headerValue = null;
while (true)
{
var line = HttpLine.Read(input, lineBuilder);
if (string.IsNullOrEmpty(line))
{
break;
}
if (headerName != null && line[0] == ' ' || line[0] == '\t')
{
headerValue = headerValue + line;
}
else
{
if (headerName != null)
{
yield return(new KeyValuePair <string, string>(headerName, headerValue));
}
var pair = line.Split(Colon, 2);
if (pair.Length != 2)
{
continue;
}
headerName = pair[0].Trim(Whitespace);
headerValue = pair[1].TrimStart(Whitespace);
}
}
if (headerName != null)
{
yield return(new KeyValuePair <string, string>(headerName, headerValue));
}
}