public bool TryParseAndAdd(string header)
{
if (header == null)
{
throw new ArgumentNullException(nameof(header));
}
var separatorIndex = header.IndexOf(':', 0);
if (separatorIndex == -1 || separatorIndex == 0)
{
return(false); // header is invalid
}
var headerStartIndex = 0;
var headerLength = separatorIndex - headerStartIndex;
HeadersHelper.TrimInPlace(header, ref headerStartIndex, ref headerLength);
var valueStartIndex = separatorIndex + 1;
var valueLength = header.Length - valueStartIndex;
HeadersHelper.TrimInPlace(header, ref valueStartIndex, ref valueLength);
if (headerLength == 0 || valueLength == 0)
{
return(false); // header name or value is empty
}
var headerName = header.Substring(headerStartIndex, headerLength);
var knownHeaderValue = GetKnownHeaderValue(headerName);
if (knownHeaderValue >= 0)
{
var value = header.Substring(valueStartIndex, valueLength);
if ((GetFlags(knownHeaderValue) & HeaderFlags.Singleton) == HeaderFlags.Singleton) // it is atomic header, so don't split it
{
this.Add(FromInt(knownHeaderValue), value);
}
else
{
foreach (var headerValue in TrimAndSplit(header, valueStartIndex, valueLength))
{
this.Add(headerName, headerValue);
}
}
}
else
{
foreach (var headerValue in TrimAndSplit(header, valueStartIndex, valueLength))
{
this.Add(headerName, headerValue);
}
}
return(true);
}
private static ValueCollection TrimAndSplit(string valueString, int startIndex, int count)
{
if (valueString == null)
{
throw new ArgumentNullException(nameof(valueString));
}
if (startIndex < 0 || startIndex >= valueString.Length)
{
throw new ArgumentOutOfRangeException(nameof(startIndex));
}
if (count < 0 || startIndex + count > valueString.Length)
{
throw new ArgumentOutOfRangeException(nameof(count));
}
const char VALUE_SEPARATOR = ',';
var values = new ValueCollection();
var valueStartIndex = startIndex;
var valueLength = count;
var valueSeparatorIndex = valueString.IndexOf(VALUE_SEPARATOR, valueStartIndex, count);
while (valueSeparatorIndex >= 0)
{
valueLength = valueSeparatorIndex - valueStartIndex;
HeadersHelper.TrimInPlace(valueString, ref valueStartIndex, ref valueLength);
if (valueLength > 0)
{
values += new ValueCollection(valueString.Substring(valueStartIndex, valueLength));
}
valueStartIndex = valueSeparatorIndex + 1;
valueLength = startIndex + count - valueStartIndex;
valueSeparatorIndex = valueString.IndexOf(VALUE_SEPARATOR, valueStartIndex, valueLength);
}
HeadersHelper.TrimInPlace(valueString, ref valueStartIndex, ref valueLength);
if (valueLength > 0)
{
values += new ValueCollection(valueString.Substring(valueStartIndex, valueLength));
}
return(values);
}
