//
// toUnicode operation; should only apply to a single label
//
private static String ToUnicodeInternal(String label, int flag)
{
bool[] caseFlags = null;
StringBuffer dest;
// step 1
// find out if all the codepoints in input are ASCII
bool isASCII = IsAllASCII(label);
if (!isASCII)
{
// step 2
// perform the nameprep operation; flag ALLOW_UNASSIGNED is used here
try
{
UCharacterIterator iter = UCharacterIterator.getInstance(label);
dest = NamePrep.prepare(iter, flag);
}
catch (Exception)
{
// toUnicode never fails; if any step fails, return the input string
return(label);
}
}
else
{
dest = new StringBuffer(label);
}
// step 3
// verify ACE Prefix
if (StartsWithACEPrefix(dest))
{
// step 4
// Remove the ACE Prefix
String temp = dest.Substring(ACE_PREFIX_LENGTH, dest.Length() - ACE_PREFIX_LENGTH);
try
{
// step 5
// Decode using punycode
StringBuffer decodeOut = Punycode.decode(new StringBuffer(temp), null);
// step 6
// Apply toASCII
String toASCIIOut = ToASCII(decodeOut.ToString(), flag);
// step 7
// verify
if (toASCIIOut.EqualsIgnoreCase(dest.ToString()))
{
// step 8
// return output of step 5
return(decodeOut.ToString());
}
}
catch (Exception)
{
// no-op
}
}
// just return the input
return(label);
}
//
// toASCII operation; should only apply to a single label
//
private static String ToASCIIInternal(String label, int flag)
{
// step 1
// Check if the string contains code points outside the ASCII range 0..0x7c.
bool isASCII = IsAllASCII(label);
StringBuffer dest;
// step 2
// perform the nameprep operation; flag ALLOW_UNASSIGNED is used here
if (!isASCII)
{
UCharacterIterator iter = UCharacterIterator.getInstance(label);
try
{
dest = NamePrep.prepare(iter, flag);
}
catch (java.text.ParseException e)
{
throw new IllegalArgumentException(e);
}
}
else
{
dest = new StringBuffer(label);
}
// step 8, move forward to check the smallest number of the code points
// the length must be inside 1..63
if (dest.Length() == 0)
{
throw new IllegalArgumentException("Empty label is not a legal name");
}
// step 3
// Verify the absence of non-LDH ASCII code points
// 0..0x2c, 0x2e..0x2f, 0x3a..0x40, 0x5b..0x60, 0x7b..0x7f
// Verify the absence of leading and trailing hyphen
bool useSTD3ASCIIRules = ((flag & USE_STD3_ASCII_RULES) != 0);
if (useSTD3ASCIIRules)
{
for (int i = 0; i < dest.Length(); i++)
{
int c = dest.CharAt(i);
if (IsNonLDHAsciiCodePoint(c))
{
throw new IllegalArgumentException("Contains non-LDH ASCII characters");
}
}
if (dest.CharAt(0) == '-' || dest.CharAt(dest.Length() - 1) == '-')
{
throw new IllegalArgumentException("Has leading or trailing hyphen");
}
}
if (!isASCII)
{
// step 4
// If all code points are inside 0..0x7f, skip to step 8
if (!IsAllASCII(dest.ToString()))
{
// step 5
// verify the sequence does not begin with ACE prefix
if (!StartsWithACEPrefix(dest))
{
// step 6
// encode the sequence with punycode
try
{
dest = Punycode.encode(dest, null);
}
catch (java.text.ParseException e)
{
throw new IllegalArgumentException(e);
}
dest = ToASCIILower(dest);
// step 7
// prepend the ACE prefix
dest.Insert(0, ACE_PREFIX);
}
else
{
throw new IllegalArgumentException("The input starts with the ACE Prefix");
}
}
}
// step 8
// the length must be inside 1..63
if (dest.Length() > MAX_LABEL_LENGTH)
{
throw new IllegalArgumentException("The label in the input is too long");
}
return(dest.ToString());
}