public override sealed void mark(int limit)
{
//Console.WriteLine("mark %d: %s",limit,isDisabled());
if (isDisabled())
{
stream.mark(limit);
return;
}
if (limit < 0)
{
throw new ArgumentException();
}
markpos = 0;
posAtMark = pos;
marklimit = limit;
}
public int read()
{
int cp = 0;
int bytesSeen = 0;
int bytesNeeded = 0;
int lower = 0x80;
int upper = 0xBF;
while (true)
{
int b = stream.ReadByte();
if (b < 0 && bytesNeeded != 0)
{
bytesNeeded = 0;
throw new IOException("", new DecoderFallbackException());
}
else if (b < 0)
{
return(-1);
}
if (bytesNeeded == 0)
{
if (b < 0x80)
{
return(b);
}
else if (b >= 0xc2 && b <= 0xdf)
{
stream.mark(4);
bytesNeeded = 1;
cp = b - 0xc0;
}
else if (b >= 0xe0 && b <= 0xef)
{
stream.mark(4);
lower = (b == 0xe0) ? 0xa0 : 0x80;
upper = (b == 0xed) ? 0x9f : 0xbf;
bytesNeeded = 2;
cp = b - 0xe0;
}
else if (b >= 0xf0 && b <= 0xf4)
{
stream.mark(4);
lower = (b == 0xf0) ? 0x90 : 0x80;
upper = (b == 0xf4) ? 0x8f : 0xbf;
bytesNeeded = 3;
cp = b - 0xf0;
}
else
{
throw new IOException("", new DecoderFallbackException());
}
cp <<= (6 * bytesNeeded);
continue;
}
if (b < lower || b > upper)
{
cp = bytesNeeded = bytesSeen = 0;
lower = 0x80;
upper = 0xbf;
stream.reset();
throw new IOException("", new DecoderFallbackException());
}
lower = 0x80;
upper = 0xbf;
bytesSeen++;
cp += (b - 0x80) << (6 * (bytesNeeded - bytesSeen));
stream.mark(4);
if (bytesSeen != bytesNeeded)
{
continue;
}
int ret = cp;
cp = 0;
bytesSeen = 0;
bytesNeeded = 0;
return(ret);
}
}
