/*----------------------------------------------------------------------------
* %%Function: ReadNCR
* %%Qualified: TCore.StreamEx.BufferedStreamEx.ReadNCR
* %%Contact: rlittle
*
* assumes we just read a "&"
*
* because we are pinning the token starting at &, if we determine that this
* isn't an NCR, then we can just reset the read location to the start and
* let the caller continue (we will return false).
*
* it is the caller's responsibility to NOT try to parse this & again as an
* NCR.
* ----------------------------------------------------------------------------*/
public bool ReadNCR(out string sNCR)
{
PinTokenStartRelative(-1);
byte b;
bool fValidNCR = false;
// look for the #
SwapBuffer.ReadByteBufferState state = ReadByte(out b);
if (b == '#')
{
bool fNeedSingleDigit = true;
while (state == SwapBuffer.ReadByteBufferState.Succeeded)
{
state = ReadByte(out b);
if (b >= '0' && b <= '9')
{
fNeedSingleDigit = false;
continue;
}
if (b == ';')
{
if (fNeedSingleDigit == false)
{
fValidNCR = true;
}
break;
}
break; // not a valid NCR
}
}
if (!fValidNCR)
{
BufferCurrent.SetPos(BufferCurrent.TokenStart);
ResetPinnedToken();
sNCR = null;
return(false);
}
// we have a valid NCR.
sNCR = Encoding.UTF8.GetString(BufferCurrent.Bytes, BufferCurrent.TokenStart, BufferCurrent.Cur - BufferCurrent.TokenStart);
ResetPinnedToken();
return(true);
}
/*----------------------------------------------------------------------------
* %%Function: ReadLine
* %%Qualified: TCore.ListenAz.Stage2.BufferedStreamEx.ReadLine
* %%Contact: rlittle
*
* read a line from the BufferedStreamEx. return the string, or null
* if we are out of lines to read. we will always return a line at
* the end of the buffer, even if its not terminated with a line ending
* ----------------------------------------------------------------------------*/
public string ReadLine()
{
ResetPinnedToken();
if (BufferCurrent.Cur >= BufferCurrent.Lim)
{
if (!SwapCurrentBuffer()) // nothing to preserve, just fill the buffer
{
return(null);
}
}
// start reading the line from the current position in the current buffer
PinTokenStartRelative(0);
bool fLookingForLF = false;
while (true)
{
byte b;
SwapBuffer.ReadByteBufferState state = ReadByte(out b);
// after read, process the read then check the state...
// otherwise, keep going forward
if (state == StreamEx.SwapBuffer.ReadByteBufferState.PinnedTokenExceedsBufferLength ||
state == StreamEx.SwapBuffer.ReadByteBufferState.SourceDataExhausted)
{
// hmm, if we got PinnedTokenExceedsBufferLength, then we have the entire buffer
// to ourselves, but no line ending was found. just invent a break here
// if we got SourceDataExhausted, then we couldn't fill the next buffer, so we are
// out of space...just return what we have
// in either case , we do the same thing (and if we are beyond the end of the buffer
// the next read will fill the buffer for us)
return(Encoding.UTF8.GetString(BufferCurrent.Bytes, BufferCurrent.TokenStart, BufferCurrent.Cur - BufferCurrent.TokenStart));
}
if (b == 0x0a)
{
// we're done. If we were looking for it, great. if not, no matter, we're still done...
int cbLineEndingAdjust = fLookingForLF ? 2 : 1;
// remember we don't want the line ending as part of the string we construct. Since ib hasn't been adjusted
// for this character, the only thing we have to worry about is if there was a leading CR
return(Encoding.UTF8.GetString(BufferCurrent.Bytes, BufferCurrent.TokenStart,
BufferCurrent.Cur - BufferCurrent.TokenStart - cbLineEndingAdjust));
}
if (fLookingForLF)
{
// was looking for a matching LF, but didn't find. must be a naked LF
// push back this character (or rather,just don't eat it)
BufferCurrent.Unget();
// remember to chop off the LF
return(Encoding.UTF8.GetString(BufferCurrent.Bytes, BufferCurrent.TokenStart, BufferCurrent.Cur - BufferCurrent.TokenStart - 1));
}
if (b == 0x0d)
{
fLookingForLF = true;
}
}
}