public static StringBuffer ConvertToUnicode(UCharacterIterator iter, IDNA2003Options options)
{
// the source contains all ascii codepoints
bool srcIsASCII = true;
int ch;
int saveIndex = iter.Index;
// step 1: find out if all the codepoints in src are ASCII
while ((ch = iter.Next()) != UCharacterIterator.DONE)
{
if (ch > 0x7F)
{
srcIsASCII = false;
break;
}
}
// The RFC states that
// <quote>
// ToUnicode never fails. If any step fails, then the original input
// is returned immediately in that step.
// </quote>
do
{
StringBuffer processOut;
if (srcIsASCII == false)
{
// step 2: process the string
iter.Index = (saveIndex);
try
{
processOut = transform.Prepare(iter, (StringPrepOptions)options);
}
catch (StringPrepParseException e)
{
break;
}
}
else
{
// just point to source
processOut = new StringBuffer(iter.GetText());
}
// step 3: verify ACE Prefix
if (StartsWithPrefix(processOut))
{
// step 4: Remove the ACE Prefix
String temp = processOut.ToString(ACE_PREFIX_LENGTH, processOut.Length - ACE_PREFIX_LENGTH);
// step 5: Decode using punycode
StringBuffer decodeOut = null;
try
{
decodeOut = PunycodeReference.Decode(new StringBuffer(temp), null);
}
catch (StringPrepParseException e)
{
break;
}
// step 6:Apply toASCII
StringBuffer toASCIIOut = ConvertToASCII(decodeOut, options);
// step 7: verify
if (CompareCaseInsensitiveASCII(processOut, toASCIIOut) != 0)
{
break;
}
// step 8: return output of step 5
return(decodeOut);
}
} while (false);
return(new StringBuffer(iter.GetText()));
}
