Method BufReadStr

DbSigs.cpp:178–219

Attempt to read a line from the buffer This is a replacement for CStdioFile::ReadLine() Both 16-bit unicode and 8-bit SBCS encoding modes are supported (via bUni) Offset parameter is incremented accordingly Supports both newline and NULL for string termination

// Offset parameter is incremented accordingly
// Supports both newline and NULL for string termination
bool CDbSigs::BufReadStr(PBYTE pBuf,CString &strOut,unsigned nMaxBytes,bool bUni,unsigned &nOffsetBytes)
{
	ASSERT(pBuf);
	CString		strOutTmp;
	bool		bDone;

	char		chAsc;
	wchar_t		chUni;
	unsigned	nCharSz = ((bUni)?sizeof(wchar_t):sizeof(char));

	bDone = false;
	strOut = _T("");
	// Ensure we don't overrun the buffer by calculating the last
	// byte index required for each iteration.
	for (unsigned nInd=nOffsetBytes;(!bDone)&&(nInd+nCharSz-1<nMaxBytes);nInd+=nCharSz) {
		if (bUni) {
			chUni = pBuf[nInd];
			if ( (chUni != '\n') && (chUni != 0) ) {
				strOut += chUni;
			} else {
				bDone = true;
				nOffsetBytes = nInd+nCharSz;
			}
		} else {
			chAsc = pBuf[nInd];
			if ( (chAsc != '\n') && (chAsc != 0) ) {
				strOut += chAsc;
			} else {
				bDone = true;
				nOffsetBytes = nInd+nCharSz;
			}
		}
	}

	if (!bDone) {
		nOffsetBytes = nMaxBytes;
		// The input was not terminated, so we're still going to return what we got so far
		return false;
	}

	return true;
}

// Return true if we managed to write entire string including terminator
// without overrunning nMaxBytes