QuietUnrar/Carthage/Checkouts/UnrarKit/Libraries/unrar/savepos.hpp

41 lines
1.0 KiB
C++

#ifndef _RAR_SAVEPOS_
#define _RAR_SAVEPOS_
class SaveFilePos
{
private:
File *SaveFile;
int64 SavePos;
public:
SaveFilePos(File &Src)
{
SaveFile=&Src;
SavePos=Src.Tell();
}
~SaveFilePos()
{
// Unless the file is already closed either by current exception
// processing or intentionally by external code.
if (SaveFile->IsOpened())
{
try
{
SaveFile->Seek(SavePos,SEEK_SET);
}
catch(RAR_EXIT)
{
// Seek() can throw an exception and it terminates process
// if we are already processing another exception. Also in C++ 11
// an exception in destructor always terminates process unless
// we mark destructor with noexcept(false). So we do not want to
// throw here. To prevent data loss we do not want to continue
// execution after seek error, so we close the file.
// Any next access to this file will return an error.
SaveFile->Close();
}
}
}
};
#endif