// Returns the length of a name/value list, separated by 'delimiter'. E.g. "a=b, c=d, e=f" adds 3
// name/value pairs to 'nameValueCollection' if 'delimiter' equals ','.
internal static int GetNameValueListLength(string input, int startIndex, char delimiter,
ObjectCollection <NameValueHeaderValue> nameValueCollection)
{
Debug.Assert(nameValueCollection != null);
Debug.Assert(startIndex >= 0);
if ((string.IsNullOrEmpty(input)) || (startIndex >= input.Length))
{
return(0);
}
int current = startIndex + HttpRuleParser.GetWhitespaceLength(input, startIndex);
while (true)
{
NameValueHeaderValue parameter = null;
int nameValueLength = NameValueHeaderValue.GetNameValueLength(input, current,
s_defaultNameValueCreator, out parameter);
if (nameValueLength == 0)
{
return(0);
}
nameValueCollection.Add(parameter);
current = current + nameValueLength;
current = current + HttpRuleParser.GetWhitespaceLength(input, current);
if ((current == input.Length) || (input[current] != delimiter))
{
// We're done and we have at least one valid name/value pair.
return(current - startIndex);
}
// input[current] is 'delimiter'. Skip the delimiter and whitespace and try to parse again.
current++; // skip delimiter.
current = current + HttpRuleParser.GetWhitespaceLength(input, current);
}
}
internal static void SetQuality(ObjectCollection <NameValueHeaderValue> parameters, double?value)
{
Debug.Assert(parameters != null);
NameValueHeaderValue qualityParameter = NameValueHeaderValue.Find(parameters, qualityName);
if (value.HasValue)
{
// Note that even if we check the value here, we can't prevent a user from adding an invalid quality
// value using Parameters.Add(). Even if we would prevent the user from adding an invalid value
// using Parameters.Add() he could always add invalid values using HttpHeaders.AddWithoutValidation().
// So this check is really for convenience to show users that they're trying to add an invalid
// value.
if ((value < 0) || (value > 1))
{
throw new ArgumentOutOfRangeException(nameof(value));
}
string qualityString = ((double)value).ToString("0.0##", NumberFormatInfo.InvariantInfo);
if (qualityParameter != null)
{
qualityParameter.Value = qualityString;
}
else
{
parameters.Add(new NameValueHeaderValue(qualityName, qualityString));
}
}
else
{
// Remove quality parameter
if (qualityParameter != null)
{
parameters.Remove(qualityParameter);
}
}
}
