RTR3DECL(int) RTFileLock(RTFILE hFile, unsigned fLock, int64_t offLock, uint64_t cbLock)
{
Assert(offLock >= 0);
/* Check arguments. */
if (fLock & ~RTFILE_LOCK_MASK)
{
AssertMsgFailed(("Invalid fLock=%08X\n", fLock));
return VERR_INVALID_PARAMETER;
}
/* Prepare flags. */
Assert(RTFILE_LOCK_WRITE);
DWORD dwFlags = (fLock & RTFILE_LOCK_WRITE) ? LOCKFILE_EXCLUSIVE_LOCK : 0;
Assert(RTFILE_LOCK_WAIT);
if (!(fLock & RTFILE_LOCK_WAIT))
dwFlags |= LOCKFILE_FAIL_IMMEDIATELY;
/* Windows structure. */
OVERLAPPED Overlapped;
memset(&Overlapped, 0, sizeof(Overlapped));
Overlapped.Offset = LOW_DWORD(offLock);
Overlapped.OffsetHigh = HIGH_DWORD(offLock);
/* Note: according to Microsoft, LockFileEx API call is available starting from NT 3.5 */
if (LockFileEx((HANDLE)RTFileToNative(hFile), dwFlags, 0, LOW_DWORD(cbLock), HIGH_DWORD(cbLock), &Overlapped))
return VINF_SUCCESS;
return RTErrConvertFromWin32(GetLastError());
}
RTR3DECL(int) RTFileUnlock(RTFILE hFile, int64_t offLock, uint64_t cbLock)
{
Assert(offLock >= 0);
if (UnlockFile((HANDLE)RTFileToNative(hFile),
LOW_DWORD(offLock), HIGH_DWORD(offLock),
LOW_DWORD(cbLock), HIGH_DWORD(cbLock)))
return VINF_SUCCESS;
return RTErrConvertFromWin32(GetLastError());
}
//---------------------------------------------------------------------------
// Set the file position pointer
//
__int64 TImageStore::Seek(__int64 Offset, DWORD MoveMethod)
{
__int64 NewPosition;
#ifdef _WIN32
#if 0
if (FType == isNBD) {
switch (MoveMethod) {
case FILE_BEGIN:
FPosition = Offset;
break;
case FILE_CURRENT:
FPosition += Offset;
break;
case FILE_END:
FPosition = FGeometry.Bytes + Offset;
break;
} // switch (MoveMethod)
} else {
#endif
DWORD nError;
LOW_DWORD(Offset) = SetFilePointer(hHandle, LOW_DWORD(Offset), &HIGH_DWORD(Offset), MoveMethod);
if (LOW_DWORD(Offset) == INVALID_SET_FILE_POINTER && (nError = GetLastError()) != NO_ERROR) {
printf ("Seek error with \n");
//throw ESelfImageFileError("Seek error with " + FFileName + ": '" + GetErrorMessage(nError) + "'");
} else
FPosition = Offset;
#else
NewPosition = lseek (hHandle,Offset, MoveMethod);
if (NewPosition<0) {
// ERROR
printf ("Seek error with \n");
} else
FPosition = NewPosition;
#endif
#if 0
} // else if (FType != NBD)
#endif
return FPosition;
} // bool __fastcall TImageStore::Seek(__int64)