public StringWithQualityHeaderValue(string value)
{
HeaderUtilities.CheckValidToken(value, nameof(value));
_value = value;
}
public AuthenticationHeaderValue(string scheme, string parameter)
{
HeaderUtilities.CheckValidToken(scheme, nameof(scheme));
_scheme = scheme;
_parameter = parameter;
}
internal static int GetRangeItemLength(string input, int startIndex, out RangeItemHeaderValue parsedValue)
{
Debug.Assert(startIndex >= 0);
// This parser parses number ranges: e.g. '1-2', '1-', '-2'.
parsedValue = null;
if (string.IsNullOrEmpty(input) || (startIndex >= input.Length))
{
return(0);
}
// Caller must remove leading whitespace. If not, we'll return 0.
int current = startIndex;
// Try parse the first value of a value pair.
int fromStartIndex = current;
int fromLength = HttpRuleParser.GetNumberLength(input, current, false);
if (fromLength > HttpRuleParser.MaxInt64Digits)
{
return(0);
}
current = current + fromLength;
current = current + HttpRuleParser.GetWhitespaceLength(input, current);
// After the first value, the '-' character must follow.
if ((current == input.Length) || (input[current] != '-'))
{
// We need a '-' character otherwise this can't be a valid range.
return(0);
}
current++; // skip the '-' character
current = current + HttpRuleParser.GetWhitespaceLength(input, current);
int toStartIndex = current;
int toLength = 0;
// If we didn't reach the end of the string, try parse the second value of the range.
if (current < input.Length)
{
toLength = HttpRuleParser.GetNumberLength(input, current, false);
if (toLength > HttpRuleParser.MaxInt64Digits)
{
return(0);
}
current = current + toLength;
current = current + HttpRuleParser.GetWhitespaceLength(input, current);
}
if ((fromLength == 0) && (toLength == 0))
{
return(0); // At least one value must be provided in order to be a valid range.
}
// Try convert first value to int64
long from = 0;
if ((fromLength > 0) && !HeaderUtilities.TryParseInt64(input, fromStartIndex, fromLength, out from))
{
return(0);
}
// Try convert second value to int64
long to = 0;
if ((toLength > 0) && !HeaderUtilities.TryParseInt64(input, toStartIndex, toLength, out to))
{
return(0);
}
// 'from' must not be greater than 'to'
if ((fromLength > 0) && (toLength > 0) && (from > to))
{
return(0);
}
parsedValue = new RangeItemHeaderValue((fromLength == 0 ? (long?)null : (long?)from),
(toLength == 0 ? (long?)null : (long?)to));
return(current - startIndex);
}
internal static int GetRetryConditionLength(string input, int startIndex, out object parsedValue)
{
Debug.Assert(startIndex >= 0);
parsedValue = null;
if (string.IsNullOrEmpty(input) || (startIndex >= input.Length))
{
return(0);
}
int current = startIndex;
// Caller must remove leading whitespace.
DateTimeOffset date = DateTimeOffset.MinValue;
int deltaSeconds = -1; // use -1 to indicate that the value was not set. 'delta' values are always >=0
// We either have a timespan or a date/time value. Determine which one we have by looking at the first char.
// If it is a number, we have a timespan, otherwise we assume we have a date.
char firstChar = input[current];
if ((firstChar >= '0') && (firstChar <= '9'))
{
int deltaStartIndex = current;
int deltaLength = HttpRuleParser.GetNumberLength(input, current, false);
// The value must be in the range 0..2^31
if ((deltaLength == 0) || (deltaLength > HttpRuleParser.MaxInt32Digits))
{
return(0);
}
current = current + deltaLength;
current = current + HttpRuleParser.GetWhitespaceLength(input, current);
// RetryConditionHeaderValue only allows 1 value. There must be no delimiter/other chars after 'delta'
if (current != input.Length)
{
return(0);
}
if (!HeaderUtilities.TryParseInt32(input, deltaStartIndex, deltaLength, out deltaSeconds))
{
return(0); // int.TryParse() may return 'false' if the value has 10 digits and is > Int32.MaxValue.
}
}
else
{
if (!HttpRuleParser.TryStringToDate(input.Substring(current), out date))
{
return(0);
}
// If we got a valid date, then the parser consumed the whole string (incl. trailing whitespace).
current = input.Length;
}
RetryConditionHeaderValue result = new RetryConditionHeaderValue();
if (deltaSeconds == -1) // we didn't change delta, so we must have found a date.
{
result._date = date;
}
else
{
result._delta = new TimeSpan(0, 0, deltaSeconds);
}
parsedValue = result;
return(current - startIndex);
}
