//---------------------------------------------------------------------
// Private members
//---------------------------------------------------------------------
private UTF32String Map(UTF32String pSource, IEncodingOption pOption)
{
bool bAllowUnassigned = false;
bool bNormalize = true;
int cPoint = 0;
int[] mPoint = null;
UTF32String mapped = null;
// Initializes
mapped = new UTF32String();
bAllowUnassigned = (pOption != null) && pOption.IsOptionSet(EncodingOption.ALLOW_UNASSIGNED);
bNormalize = (pOption != null) && pOption.IsOptionSet(EncodingOption.USE_NORMALIZE);
// valid?
if (null == pSource)
{
return(mapped);
}
// for each char
for (int index = 0; index < pSource.Length; index++)
{
// get code point
cPoint = pSource[index];
// check if it's unassigned
if (bAllowUnassigned && m_unassignedMapping.IsUnassigned(cPoint))
{
throw new UnassignedCodePointException(string.Format("Unassigned code point found: {0} in {1:X8}\r\n", cPoint, pSource.ToString()));
}
// check if there is any map nothing
if (m_nothingMapping.IsMapNothing(cPoint))
{
continue;
}
// check the map
if (bNormalize)
{
mPoint = m_normalizedCaseMapping.Mapping(cPoint);
}
else
{
mPoint = m_unnormalizedCaseMapping.Mapping(cPoint);
}
// having mapping?
if ((null == mPoint) || (0 == mPoint.Length))
{
mPoint = new int [1] {
cPoint
}
}
;
// add the mapping to the output
for (int mIndex = 0; mIndex < mPoint.Length; mIndex++)
{
mapped.Append(mPoint[mIndex]);
}
}
//Done
return(mapped);
}
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);
}
