private static int DecodeSymbol()
{
if (UTF8.byteIndex > UTF8.byteCount)
{
throw new UTF8Exception("Invalid byte index");
}
if (UTF8.byteIndex == UTF8.byteCount)
{
return(-1);
}
int num1 = UTF8.byteArray[UTF8.byteIndex] & (int)byte.MaxValue;
++UTF8.byteIndex;
if ((num1 & 128) == 0)
{
return(num1);
}
if ((num1 & 224) == 192)
{
int num2 = UTF8.ReadContinuationByte();
int num3 = (num1 & 31) << 6 | num2;
if (num3 >= 128)
{
return(num3);
}
throw new UTF8Exception("Invalid continuation byte");
}
if ((num1 & 240) == 224)
{
int num2 = UTF8.ReadContinuationByte();
int num3 = UTF8.ReadContinuationByte();
int num4 = (num1 & 15) << 12 | num2 << 6 | num3;
if (num4 >= 2048)
{
return(num4);
}
throw new UTF8Exception("Invalid continuation byte");
}
if ((num1 & 248) == 240)
{
int num2 = UTF8.ReadContinuationByte();
int num3 = UTF8.ReadContinuationByte();
int num4 = UTF8.ReadContinuationByte();
int num5 = (num1 & 15) << 18 | num2 << 12 | num3 << 6 | num4;
if (num5 >= 65536 && num5 <= 1114111)
{
return(num5);
}
}
throw new UTF8Exception("Invalid continuation byte");
}
public static string Decode(string byteString)
{
UTF8.byteArray = UTF8.Ucs2Decode(byteString);
UTF8.byteCount = UTF8.byteArray.Count;
UTF8.byteIndex = 0;
List <int> array = new List <int>();
int num;
while ((num = UTF8.DecodeSymbol()) != -1)
{
array.Add(num);
}
return(UTF8.Ucs2Encode(array));
}
public static string Encode(string str)
{
List <int> intList = UTF8.Ucs2Decode(str);
int count = intList.Count;
int index = -1;
StringBuilder stringBuilder = new StringBuilder();
while (++index < count)
{
int codePoint = intList[index];
stringBuilder.Append(UTF8.EncodeCodePoint(codePoint));
}
return(stringBuilder.ToString());
}