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()));
}
public static StringBuffer ConvertToASCII(UCharacterIterator srcIter, IDNA2003Options options)
{
char[]
caseFlags = null;
// the source contains all ascii codepoints
bool srcIsASCII = true;
// assume the source contains all LDH codepoints
bool srcIsLDH = true;
//get the options
bool useSTD3ASCIIRules = ((options & USE_STD3_RULES) != 0);
int ch;
// step 1
while ((ch = srcIter.Next()) != UCharacterIterator.DONE)
{
if (ch > 0x7f)
{
srcIsASCII = false;
}
}
int failPos = -1;
srcIter.SetToStart();
StringBuffer processOut = null;
// step 2 is performed only if the source contains non ASCII
if (!srcIsASCII)
{
// step 2
processOut = transform.Prepare(srcIter, (StringPrepOptions)options);
}
else
{
processOut = new StringBuffer(srcIter.GetText());
}
int poLen = processOut.Length;
if (poLen == 0)
{
throw new StringPrepParseException("Found zero length lable after NamePrep.", StringPrepErrorType.ZeroLengthLabel);
}
StringBuffer dest = new StringBuffer();
// reset the variable to verify if output of prepare is ASCII or not
srcIsASCII = true;
// step 3 & 4
for (int j = 0; j < poLen; j++)
{
ch = processOut[j];
if (ch > 0x7F)
{
srcIsASCII = false;
}
else if (IsLDHChar(ch) == false)
{
// here we do not assemble surrogates
// since we know that LDH code points
// are in the ASCII range only
srcIsLDH = false;
failPos = j;
}
}
if (useSTD3ASCIIRules == true)
{
// verify 3a and 3b
if (srcIsLDH == false || /* source contains some non-LDH characters */
processOut[0] == HYPHEN ||
processOut[processOut.Length - 1] == HYPHEN)
{
/* populate the parseError struct */
if (srcIsLDH == false)
{
throw new StringPrepParseException("The input does not conform to the STD 3 ASCII rules",
StringPrepErrorType.STD3ASCIIRulesError,
processOut.ToString(),
(failPos > 0) ? (failPos - 1) : failPos);
}
else if (processOut[0] == HYPHEN)
{
throw new StringPrepParseException("The input does not conform to the STD 3 ASCII rules",
StringPrepErrorType.STD3ASCIIRulesError, processOut.ToString(), 0);
}
else
{
throw new StringPrepParseException("The input does not conform to the STD 3 ASCII rules",
StringPrepErrorType.STD3ASCIIRulesError,
processOut.ToString(),
(poLen > 0) ? poLen - 1 : poLen);
}
}
}
if (srcIsASCII)
{
dest = processOut;
}
else
{
// step 5 : verify the sequence does not begin with ACE prefix
if (!StartsWithPrefix(processOut))
{
//step 6: encode the sequence with punycode
StringBuffer punyout = PunycodeReference.Encode(processOut, caseFlags);
// convert all codepoints to lower case ASCII
StringBuffer lowerOut = ToASCIILower(punyout);
//Step 7: prepend the ACE prefix
dest.Append(ACE_PREFIX, 0, ACE_PREFIX_LENGTH - 0); // ICU4N: Checked 3rd parameter
//Step 6: copy the contents in b2 into dest
dest.Append(lowerOut);
}
else
{
throw new StringPrepParseException("The input does not start with the ACE Prefix.",
StringPrepErrorType.AcePrefixError, processOut.ToString(), 0);
}
}
if (dest.Length > MAX_LABEL_LENGTH)
{
throw new StringPrepParseException("The labels in the input are too long. Length > 64.",
StringPrepErrorType.LabelTooLongError, dest.ToString(), 0);
}
return(dest);
}