internal static bool ConvertTo(AdName.ConvertOption option, string input, int startIndex, int length, out string converted)
{
if (!AdName.TryConvertTo(option, input, startIndex, length, out converted))
{
throw new FormatException(DirectoryStrings.InvalidDNFormat(input));
}
return(converted != null);
}
internal static bool TryConvertTo(AdName.ConvertOption option, string input, int startIndex, int length, out string converted)
{
converted = null;
StringBuilder stringBuilder = null;
int num = startIndex;
int num2 = startIndex;
int num3 = startIndex + length;
switch (option)
{
case AdName.ConvertOption.Escape:
num2 = AdName.EscapeChar(input, ref num, startIndex + 1, num3, num2, true, ref stringBuilder);
if (num2 < num3 - 2)
{
num2 = AdName.EscapeChar(input, ref num, num3 - 1, num3, ++num2, false, ref stringBuilder);
}
if (num2 < num3 - 1)
{
AdName.EscapeChar(input, ref num, num3, num3, ++num2, true, ref stringBuilder);
}
break;
case AdName.ConvertOption.Unescape:
if (!AdName.UnescapeChar(input, ref num, startIndex + 1, num3, ref num2, true, ref stringBuilder))
{
return(false);
}
if (num2 < num3 - 3)
{
num2++;
if (!AdName.UnescapeChar(input, ref num, num3 - 2, num3, ref num2, false, ref stringBuilder))
{
return(false);
}
}
if (num2 < num3 - 1)
{
num2++;
if (!AdName.UnescapeChar(input, ref num, num3, num3, ref num2, true, ref stringBuilder))
{
return(false);
}
}
break;
case AdName.ConvertOption.Format:
if (input[startIndex] == ' ')
{
while (++startIndex < num3 && input[startIndex] == ' ')
{
}
if (startIndex >= num3)
{
return(false);
}
if (!AdName.TryConvertTo(AdName.ConvertOption.Format, input, startIndex, num3 - startIndex, out converted))
{
return(false);
}
if (converted == null)
{
converted = input.Substring(startIndex, num3 - startIndex);
}
return(true);
}
else
{
if (!AdName.TryFormatChar(input, ref num, startIndex + 1, num3, ref num2, true, true, ref stringBuilder))
{
return(false);
}
if (num2 < num3 - 3)
{
num2++;
if (!AdName.TryFormatChar(input, ref num, num3 - 2, num3, ref num2, false, false, ref stringBuilder))
{
return(false);
}
}
if (num2 < num3 - 2 && input[num2 + 1] == ' ')
{
num2++;
if (!AdName.TryFormatChar(input, ref num, num3 - 1, num3, ref num2, true, false, ref stringBuilder))
{
return(false);
}
}
if (num2 < num3 - 1)
{
num2++;
if (!AdName.TryFormatChar(input, ref num, num3, num3, ref num2, true, true, ref stringBuilder))
{
return(false);
}
}
}
break;
}
if (stringBuilder == null)
{
return(true);
}
if (num < num3)
{
stringBuilder.Append(input, num, num3 - num);
}
converted = stringBuilder.ToString();
if (converted.Equals(input))
{
converted = input;
}
return(true);
}
