private static bool TrySetOptionalTokenList(NameValueHeaderValue nameValue, ref bool boolField,
ref ObjectCollection <string>?destination)
{
Debug.Assert(nameValue != null);
if (nameValue.Value == null)
{
boolField = true;
return(true);
}
// We need the string to be at least 3 chars long: 2x quotes and at least 1 character. Also make sure we
// have a quoted string. Note that NameValueHeaderValue will never have leading/trailing whitespace.
string valueString = nameValue.Value;
if ((valueString.Length < 3) || (valueString[0] != '\"') || (valueString[valueString.Length - 1] != '\"'))
{
return(false);
}
// We have a quoted string. Now verify that the string contains a list of valid tokens separated by ','.
int current = 1; // skip the initial '"' character.
int maxLength = valueString.Length - 1; // -1 because we don't want to parse the final '"'.
bool separatorFound = false;
int originalValueCount = destination == null ? 0 : destination.Count;
while (current < maxLength)
{
current = HeaderUtilities.GetNextNonEmptyOrWhitespaceIndex(valueString, current, true,
out separatorFound);
if (current == maxLength)
{
break;
}
int tokenLength = HttpRuleParser.GetTokenLength(valueString, current);
if (tokenLength == 0)
{
// We already skipped whitespace and separators. If we don't have a token it must be an invalid
// character.
return(false);
}
destination ??= new ObjectCollection <string>(s_checkIsValidToken);
destination.Add(valueString.Substring(current, tokenLength));
current = current + tokenLength;
}
// After parsing a valid token list, we expect to have at least one value
if ((destination != null) && (destination.Count > originalValueCount))
{
boolField = true;
return(true);
}
return(false);
}
internal static void SetQuality(
ObjectCollection <NameValueHeaderValue> parameters,
double?value)
{
NameValueHeaderValue valueHeaderValue = NameValueHeaderValue.Find(parameters, "q");
if (value.HasValue)
{
double?nullable = value;
double num1 = 0.0;
if (!(nullable.GetValueOrDefault() < num1 & nullable.HasValue))
{
nullable = value;
double num2 = 1.0;
if (!(nullable.GetValueOrDefault() > num2 & nullable.HasValue))
{
string str = value.Value.ToString("0.0##", (IFormatProvider)NumberFormatInfo.InvariantInfo);
if (valueHeaderValue != null)
{
valueHeaderValue.Value = str;
return;
}
parameters.Add(new NameValueHeaderValue("q", str));
return;
}
}
throw new ArgumentOutOfRangeException(nameof(value));
}
if (valueHeaderValue == null)
{
return;
}
parameters.Remove(valueHeaderValue);
}
internal static ObjectCollection <NameValueHeaderValue>?Clone(this ObjectCollection <NameValueHeaderValue>?source)
{
if (source == null)
{
return(null);
}
var copy = new ObjectCollection <NameValueHeaderValue>();
foreach (NameValueHeaderValue item in source)
{
copy.Add(new NameValueHeaderValue(item));
}
return(copy);
}
internal static int GetNameValueListLength(
string input,
int startIndex,
char delimiter,
ObjectCollection <NameValueHeaderValue> nameValueCollection)
{
if (string.IsNullOrEmpty(input) || startIndex >= input.Length)
{
return(0);
}
int startIndex1 = startIndex + HttpRuleParser.GetWhitespaceLength(input, startIndex);
int index;
while (true)
{
NameValueHeaderValue parsedValue = (NameValueHeaderValue)null;
int nameValueLength = NameValueHeaderValue.GetNameValueLength(input, startIndex1, NameValueHeaderValue.s_defaultNameValueCreator, out parsedValue);
if (nameValueLength != 0)
{
nameValueCollection.Add(parsedValue);
int startIndex2 = startIndex1 + nameValueLength;
index = startIndex2 + HttpRuleParser.GetWhitespaceLength(input, startIndex2);
if (index != input.Length && (int)input[index] == (int)delimiter)
{
int startIndex3 = index + 1;
startIndex1 = startIndex3 + HttpRuleParser.GetWhitespaceLength(input, startIndex3);
}
else
{
goto label_6;
}
}
else
{
break;
}
}
return(0);
label_6:
return(index - startIndex);
}
// 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);
}
}
}