public override string Encode(UTF32String pSource, bool[] pCaseFlag)
{
int currentLargestCP = 0;
int delta = 0;
int cpsHandled = 0;
int bias = 0;
int nextLargerCP = 0;
int currentDelta = 0;
int currentBase = 0;
int threshold = 0;
int basicCPsCount = 0;
StringBuilder buffer = null;
// valid?
if ((null == pSource) || (0 == pSource.Length))
{
throw new PunycodeException("Invalid input(null)");
}
// Initializes
buffer = new StringBuilder();
bias = (int)Punycode.INITIAL_BIAS;
currentLargestCP = (int)Punycode.INITIAL_N;
// add all the basic code points to the output string
for (int i = 0; i < pSource.Length; i++)
{
int inputChar = pSource[i];
if (Converter.IsAscii(inputChar))
{
if (pCaseFlag != null)
{
inputChar = PunyConverter.EncodeBasic(inputChar, pCaseFlag[i]);
}
// Add it to the output
buffer.Append((char)inputChar);
}
}
basicCPsCount = buffer.Length;
cpsHandled = basicCPsCount;
// need to append the delimiter?
if (basicCPsCount > 0)
{
buffer.Append((char)Punycode.DELIMITER);
}
// Main encoding loop
while (cpsHandled < pSource.Length)
{
// All non-basic code points < n have been
// handled already. Find the next larger one:
nextLargerCP = int.MaxValue;
for (int index = 0; index < pSource.Length; ++index)
{
int inputChar = pSource[index];
// Get the next largest one.
if (inputChar >= currentLargestCP && inputChar < nextLargerCP)
{
nextLargerCP = inputChar;
}
}
// Increase delta enough to advance the decoder's
// <currentLargestCP, i> state to <nextLargerCP, 0>,
// but guard against overflow:
if ((nextLargerCP - currentLargestCP) > ((int.MaxValue - delta) / (cpsHandled + 1)))
{
throw new PunycodeException("Punycode Encoding Overflow");
}
delta += (nextLargerCP - currentLargestCP) * (cpsHandled + 1);
currentLargestCP = nextLargerCP;
for (int index = 0; index < pSource.Length; ++index)
{
int inputChar = pSource[index];
if ((inputChar) < currentLargestCP && ++delta == 0)
{
throw new PunycodeException("Output too large");
}
if (inputChar == currentLargestCP)
{
for (currentDelta = delta, currentBase = (int)Punycode.BASE; ; currentBase += (int)Punycode.BASE)
{
if (buffer.Length >= (int)Punycode.PUNYCODE_MAX_LENGTH)
{
throw new PunycodeException("Output too long");
}
// calculate the threshold
if (currentBase <= bias)
{
threshold = (int)Punycode.T_MIN;
}
else
{
threshold = (currentBase >= (bias + (int)Punycode.T_MAX)) ? (int)Punycode.T_MAX : currentBase - bias;
}
if (currentDelta < threshold)
{
int outputDelta = currentDelta;
// determine the current uppercase flag
bool ucFlag = (pCaseFlag != null) ? ucFlag = pCaseFlag[index] : false;
// encode the delta
char encodedDelta = (char)PunyConverter.EncodeDigit(outputDelta, ucFlag);
// append the encoded delta to output
buffer.Append(encodedDelta);
break;
}
else
{
int outputDelta;
char encodedDelta;
outputDelta = threshold + (currentDelta - threshold) % ((int)Punycode.BASE - threshold);
// encode the delta
encodedDelta = (char)PunyConverter.EncodeDigit(outputDelta, false);
// append the encoded delta to output
buffer.Append(encodedDelta);
// adjust the delta value for next iteration
currentDelta = (currentDelta - threshold) / ((int)Punycode.BASE - threshold);
}
}
// Adapt the bias:
bias = PunyConverter.Adapt(delta, cpsHandled + 1, cpsHandled == basicCPsCount);
delta = 0;
++cpsHandled;
}
}
++delta;
++currentLargestCP;
}
if (buffer.Length > (int)Punycode.PUNYCODE_MAX_LENGTH)
{
throw new PunycodeException(string.Format("Output too long: {0}", buffer.Length));
}
// Done.
return(buffer.ToString());
}
public override UTF32String Decode(string pSource, bool[] pCaseFlag)
{
int decodedVal = 0;
//int out = 0;
int opIndex = 0;
int bias = 0;
int basicCPsCount = 0;
int index = 0;
int oldIndex = 0;
int weight = 0;
int currentBase = 0;
int delta = 0;
int digit = 0;
int threshold = 0;
UTF32String decoded = null;
pSource = StringUtil.Normalize(pSource);
if (null == pSource)
{
throw new PunycodeException("Invalid input parameter(null)");
}
// check if it starts with prefix
if (pSource.StartsWith(this.Prefix))
{
pSource = StringUtil.Normalize(pSource.Substring(this.Prefix.Length));
}
// valid?
if (null == pSource)
{
throw new PunycodeException("Invalid input parameter(null)");
}
// check if it's delimiter
if (pSource[pSource.Length - 1] == (char)Punycode.DELIMITER)
{
throw new PunycodeException("Invalid input format: string ends with delimiter");
}
// Initializes
opIndex = 0;
bias = (int)Punycode.INITIAL_BIAS;
decodedVal = (int)Punycode.INITIAL_N;
decoded = new UTF32String();
// Handle the basic code points: Let b be the number of input code
// points before the last delimiter, or 0 if there is none, then
// copy the first b code points to the output.
for (basicCPsCount = 0, index = 0; index < pSource.Length; index++)
{
if (PunyConverter.IsDelimiter(pSource[index]))
{
basicCPsCount = index;
}
}
// check string length
if (basicCPsCount > (int)Punycode.PUNYCODE_MAX_LENGTH)
{
throw new PunycodeException(string.Format("Input string too long: {0}", basicCPsCount));
}
// For each char
for (index = 0; index < basicCPsCount; index++)
{
char inputChar = pSource[index];
if (pCaseFlag != null)
{
pCaseFlag[index] = PunyConverter.IsFlagged(inputChar);
}
// check if it's ascii
if (!PunyConverter.IsAscii(inputChar))
{
throw new PunycodeException(string.Format("Decoding error, bad char in input string: {0}", inputChar));
}
decoded.Append((int)inputChar);
}
// Main decoding loop: Start just after the last delimiter if any
// basic code points were copied; start at the beginning otherwise.
index = (basicCPsCount > 0) ? basicCPsCount + 1 : 0;
while (index < pSource.Length)
{
// index is the index of the next character to be consumed, and
// out is the number of code points in the output array.
// Decode a generalized variable-length integer into delta,
// which gets added to i. The overflow checking is easier
// if we increase i as we go, then subtract off its starting
// value at the end to obtain delta.
oldIndex = opIndex;
weight = 1;
currentBase = (int)Punycode.BASE;
for ( ; ;)
{
if (index >= pSource.Length)
{
throw new PunycodeException("Bad input string for decoding");
}
digit = PunyConverter.DecodeDigit(pSource[index++]);
// valid?
if (digit >= (int)Punycode.BASE)
{
throw new PunycodeException("Invalid input string for decoding");
}
if (digit > (int.MaxValue - opIndex) / weight)
{
throw new PunycodeException("Punycode decoding overflow");
}
opIndex += digit * weight;
// calculate the threshold
if (currentBase <= bias)
{
threshold = (int)Punycode.T_MIN;
}
else
{
threshold = ((currentBase - bias) >= (int)Punycode.T_MAX) ? (int)Punycode.T_MAX : (currentBase - bias);
}
// Finished?
if (digit < threshold)
{
break;
}
// check if weight is valid
if (weight > (int.MaxValue / ((int)Punycode.BASE - threshold)))
{
throw new PunycodeException(string.Format("Decoding overflow, Invalid weight: {0}", weight));
}
// new weight
weight *= ((int)Punycode.BASE - threshold);
currentBase += (int)Punycode.BASE;
}
// Adapt the bias
delta = (oldIndex == 0) ? opIndex / (int)Punycode.DAMP : (opIndex - oldIndex) >> 1;
delta += delta / (decoded.Length + 1);
for (bias = 0; delta > (int)Punycode.CUTOFF; bias += (int)Punycode.BASE)
{
delta /= (int)Punycode.LOBASE;
}
// new bias
bias += ((int)Punycode.LOBASE + 1) * delta / (delta + (int)Punycode.SKEW);
// opIndex was supposed to wrap around from decoded.length()+1 to 0,
// incrementing n each time, so we'll fix that now:
if (opIndex / (decoded.Length + 1) > (int.MaxValue - decodedVal))
{
throw new PunycodeException(string.Format("Decooding overflow, invalid op index:{0}", opIndex));
}
// calculate new index and value
decodedVal += opIndex / (decoded.Length + 1);
opIndex %= (decoded.Length + 1);
// valid?
if (decoded.Length >= (int)Punycode.PUNYCODE_MAX_LENGTH)
{
throw new PunycodeException(string.Format("Decoding overflow, decoded string too long:{0}", decoded.Length));
}
// check case flag
// Case of last character determines uppercase flag
if (pCaseFlag != null)
{
pCaseFlag[opIndex] = PunyConverter.IsFlagged(pSource[index - 1]);
}
// check if the number corresponds to a valid unicode character
if (decodedVal > (int)Punycode.MAX_UNICODE)
{
throw new PunycodeException(string.Format("Decoding overflow, decoded code point out of range: U{0:X8}", decodedVal));
}
// Insert decodedVal at position i of the output
if (Converter.IsSeperator(decodedVal))
{
throw new PunycodeException(string.Format("Decoding error, delimiter found: U{0:X8}", decodedVal));
}
// add it to decoded output
decoded.Insert(opIndex++, new int[1] {
decodedVal
});
}
// return the decoded
return(decoded);
}