private static int GetRangeLength(StringSegment input, int startIndex, out RangeHeaderValue parsedValue)
{
Contract.Requires(startIndex >= 0);
parsedValue = null;
if (StringSegment.IsNullOrEmpty(input) || (startIndex >= input.Length))
{
return(0);
}
// Parse the unit string: <unit> in '<unit>=<from1>-<to1>, <from2>-<to2>'
var unitLength = HttpRuleParser.GetTokenLength(input, startIndex);
if (unitLength == 0)
{
return(0);
}
RangeHeaderValue result = new RangeHeaderValue();
result._unit = input.Subsegment(startIndex, unitLength);
var current = startIndex + unitLength;
current = current + HttpRuleParser.GetWhitespaceLength(input, current);
if ((current == input.Length) || (input[current] != '='))
{
return(0);
}
current++; // skip '=' separator
current = current + HttpRuleParser.GetWhitespaceLength(input, current);
var rangesLength = RangeItemHeaderValue.GetRangeItemListLength(input, current, result.Ranges);
if (rangesLength == 0)
{
return(0);
}
current = current + rangesLength;
Contract.Assert(current == input.Length, "GetRangeItemListLength() should consume the whole string or fail.");
parsedValue = result;
return(current - startIndex);
}
public static bool TryParse(StringSegment input, out RangeHeaderValue parsedValue)
{
var index = 0;
return(Parser.TryParseValue(input, ref index, out parsedValue));
}