-
-bool isSameFile(string const & fileone, string const & filetwo)
-{
- HANDLE h1 = CreateFile(fileone.c_str(), 0,
- FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
- HANDLE h2 = CreateFile(filetwo.c_str(), 0,
- FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);
-
- if (h1 == INVALID_HANDLE_VALUE || h2 == INVALID_HANDLE_VALUE) {
- // One or both files cannot be accessed.
- if (h1 != INVALID_HANDLE_VALUE)
- CloseHandle(h1);
- if (h2 != INVALID_HANDLE_VALUE)
- CloseHandle(h2);
- return false;
- }
-
- BY_HANDLE_FILE_INFORMATION info1;
- BY_HANDLE_FILE_INFORMATION info2;
- bool samefile = false;
- if (GetFileInformationByHandle(h1, &info1) != 0
- && GetFileInformationByHandle(h2, &info2) != 0) {
- // Serial number of the volumes containing the files.
- ULONG st1_dev = info1.dwVolumeSerialNumber;
- ULONG st2_dev = info2.dwVolumeSerialNumber;
- // Unique identifiers associated to the files on the volumes.
- ULONGLONG highbits = info1.nFileIndexHigh & 0x0000FFFF;
- ULONGLONG st1_ino = (highbits << sizeof(ULONG)) | info1.nFileIndexLow;
- highbits = info2.nFileIndexHigh & 0x0000FFFF;
- ULONGLONG st2_ino = (highbits << sizeof(ULONG)) | info2.nFileIndexLow;
- samefile = st1_ino == st2_ino && st1_dev == st2_dev;
- }
- CloseHandle(h1);
- CloseHandle(h2);
- return samefile;