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#ifndef CMP_FILETIME_H_INCLUDED
#define CMP_FILETIME_H_INCLUDED
#include <wx/stopwatch.h>
#include <zen/int64.h>
namespace zen
{
//---------------------------------------------------------------------------------------------------------------
inline
bool sameFileTime(const Int64& a, const Int64& b, size_t tolerance)
{
if (a < b)
return b <= a + static_cast<int>(tolerance);
else
return a <= b + static_cast<int>(tolerance);
}
//---------------------------------------------------------------------------------------------------------------
//number of seconds since Jan 1st 1970 + 1 year (needn't be too precise)
static const long oneYearFromNow = wxGetUTCTime() + 365 * 24 * 3600; //init at program startup alas in *each* compilation untit -> avoid MT issues
//refactor when C++11 thread-safe static initialization is availalbe in VS (already in GCC)
class CmpFileTime
{
public:
CmpFileTime(size_t tolerance) : tolerance_(tolerance) {}
enum Result
{
TIME_EQUAL,
TIME_LEFT_NEWER,
TIME_RIGHT_NEWER,
TIME_LEFT_INVALID,
TIME_RIGHT_INVALID
};
Result getResult(const Int64& lhs, const Int64& rhs) const
{
if (sameFileTime(lhs, rhs, tolerance_)) //last write time may differ by up to 2 seconds (NTFS vs FAT32)
return TIME_EQUAL;
//check for erroneous dates
if (lhs < 0 || lhs > oneYearFromNow) //earlier than Jan 1st 1970 or more than one year in future
return TIME_LEFT_INVALID;
if (rhs < 0 || rhs > oneYearFromNow)
return TIME_RIGHT_INVALID;
//regular time comparison
if (lhs < rhs)
return TIME_RIGHT_NEWER;
else
return TIME_LEFT_NEWER;
}
private:
const size_t tolerance_;
};
}
#endif // CMP_FILETIME_H_INCLUDED
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