BOOL CLogFile::FindHoles(CArrayIntAndPointer* papvOverlapping, filePos iPosition, filePos iLength)
{
CArrayIntAndPointer apvOverlappingSorted;
int i;
CLogFileCommandWrite* psWrite;
int eCommand;
BOOL bHoles;
filePos iEnd;
if (iLength == 0)
{
return FALSE;
}
if (papvOverlapping->NumElements() == 0)
{
return FALSE;
}
apvOverlappingSorted.Init(1);
apvOverlappingSorted.Copy(papvOverlapping);
apvOverlappingSorted.QuickSort(CompareLogFileWrite);
apvOverlappingSorted.Get(0, (void**)&psWrite, &eCommand);
if (psWrite->iPosition > iPosition)
{
apvOverlappingSorted.Kill();
return TRUE;
}
else
{
iEnd = psWrite->iPosition + psWrite->iSize -1;
}
bHoles = FALSE;
for (i = 1; i < apvOverlappingSorted.NumElements(); i++)
{
apvOverlappingSorted.Get(i, (void**)&psWrite, &eCommand);
if (psWrite->iPosition > (iEnd+1))
{
bHoles = TRUE;
break;
}
iEnd = psWrite->iPosition + psWrite->iSize -1;
if (iEnd >= (iPosition + iLength-1))
{
break;
}
}
if (iEnd < (iPosition + iLength-1))
{
bHoles = TRUE;
}
apvOverlappingSorted.Kill();
return bHoles;
}
BOOL CCalculator::Expression(CCalcExpression** ppcExpression)
{
BOOL bOperator;
BOOL bOperand;
BOOL bFirst;
CArrayIntAndPointer cArray;
CCalcOperator* pcOperator;
CCalcExpression* pcOperand;
cArray.Init(16);
bFirst = TRUE;
for (;;)
{
for (;;)
{
bOperator = Operator(&pcOperator);
if (!bOperator)
{
break;
}
cArray.Add(pcOperator, 0);
}
bOperand = Operand(&pcOperand);
if (!bOperand && !bOperator)
{
if (bFirst)
{
cArray.Kill();
return FALSE;
}
else
{
BuildExpression(ppcExpression, &cArray);
cArray.Kill();
if (*ppcExpression == NULL)
{
return FALSE;
}
else
{
return TRUE;
}
}
}
cArray.Add(pcOperand, 0);
bFirst = FALSE;
}
}
CInputVirtualDevice* CInputDevice::CreateVariableVirtualDeviceFromThis(CInputActions* pcInputActions)
{
CInputVirtualDevice* pcVirtual;
CInputSourceDesc* pcSource;
CInputDevices* pcInputDevices;
CChars szTemp;
CArrayIntAndPointer apcSourceDescs;
int i;
pcInputDevices = GetInputDevices();
szTemp.Init(mszFriendlyName.Text());
szTemp.Append(" Variable");
pcVirtual = pcInputDevices->CreateVirtualDevice(szTemp.Text());
szTemp.Kill();
mcVariables.SetChords(pcVirtual->GetChords());
apcSourceDescs.Init(8);
mpcDesc->GetVariableChordDescs()->GetInputSourceDescs(&apcSourceDescs, mpcDesc);
for (i = 0; i < apcSourceDescs.NumElements(); i++)
{
pcSource = (CInputSourceDesc*)apcSourceDescs.GetPtr(i);
pcVirtual->AddSource(this, pcSource);
}
apcSourceDescs.Kill();
pcVirtual->DoneAddingSources();
GetInputDevices()->AddChords(pcVirtual, mpcDesc->GetVariableChordDescs(), this);
pcInputDevices->UpdateCommonality();
pcVirtual->Unstoppable();
return pcVirtual;
}
filePos CLogFile::ReadNextTouchingWrites(int iWriteIndex, void* pvDest, filePos iSize, filePos iCount)
{
CArrayIntAndPointer apvOverlapping;
BOOL bAny;
filePos iByteSize;
iByteSize = iSize * iCount;
bAny = FindTouchingWriteCommands(iWriteIndex, &apvOverlapping, miPosition, iByteSize, TRUE);
if (bAny)
{
CopyWritesToRead(&apvOverlapping, iByteSize, pvDest);
apvOverlapping.Kill();
}
return iCount;
}
filePos CLogFile::Write(const void* pvSource, filePos iSize, filePos iCount)
{
CArrayIntAndPointer apvOverlapping;
BOOL bAny;
filePos iByteLength;
CLogFileCommandWrite* pcWrite;
if (IsFileModeWritable(meFileMode))
{
mbTouched = TRUE;
iByteLength = iSize * iCount;
if (miLastWriteOpenIndex == -1)
{
bAny = FALSE;
}
else
{
bAny = FindTouchingWriteCommands(miLastWriteOpenIndex + 1, &apvOverlapping, miPosition, iByteLength, FALSE);
}
if (bAny)
{
AmalgamateOverlappingWrites(&apvOverlapping, pvSource, miPosition, iByteLength);
apvOverlapping.Kill();
miPosition += iByteLength;
}
else
{
pcWrite = AddWriteCommand(miPosition, (void*)pvSource, iByteLength);
if (!pcWrite)
{
return 0;
}
miPosition += iByteLength;
}
UpdateLength();
return iCount;
}
else
{
return 0;
}
}
filePos CLogFile::ReadFirstTouchingWrites(int iWriteIndex, void* pvDest, filePos iSize, filePos iCount)
{
CArrayIntAndPointer apvOverlapping;
BOOL bAny;
BOOL bHoles;
filePos iBytesReadFromFile;
filePos iByteSize;
iByteSize = iSize * iCount;
bAny = FindTouchingWriteCommands(iWriteIndex, &apvOverlapping, miPosition, iByteSize, TRUE);
if (bAny)
{
bHoles = FindHoles(&apvOverlapping, miPosition, iByteSize);
if (bHoles)
{
iBytesReadFromFile = ReadFromBackingFile(pvDest, iSize, iCount);
}
CopyWritesToRead(&apvOverlapping, iByteSize, pvDest);
apvOverlapping.Kill();
return iCount;
}
else
{
if (miFileLength == 0)
{
return iCount;
}
else
{
iBytesReadFromFile = ReadWithNoTouchingWrites(pvDest, iSize, iCount);
if (iBytesReadFromFile == iByteSize)
{
return iCount;
}
else
{
return 0;
}
}
}
}