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WinAPI/IO: Fix handling of end of file offset in SetFilePointerEx

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This just means the end of the file is being used as the base offset.

Also note that according to the documentation for SetFilePositionEx,
that setting the position beyond the current file size is not considered
an error as far as the API is concerned.
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LC committed 2026-07-12 01:26:23 -04:00
1 parent 12baceb859
commit f5ae888597
1 file changed
+12 -3
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Source/Windows/Common/WinAPI/IO.cpp
+12 -3
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@@ -147,9 +147,18 @@ DLLEXPORT_FUNC(WINBOOL, SetFilePointerEx, (HANDLE hFile, LARGE_INTEGER liDistanc
}
switch (dwMoveMethod) {
case FILE_BEGIN: PositionInfo.CurrentByteOffset = liDistanceToMove; break;
case FILE_CURRENT: PositionInfo.CurrentByteOffset.QuadPart += liDistanceToMove.QuadPart; break;
case FILE_END: PositionInfo.CurrentByteOffset = StandardInfo.EndOfFile; break;
case FILE_BEGIN: {
PositionInfo.CurrentByteOffset = liDistanceToMove;
break;
}
case FILE_CURRENT: {
PositionInfo.CurrentByteOffset.QuadPart += liDistanceToMove.QuadPart;
break;
}
case FILE_END: {
PositionInfo.CurrentByteOffset.QuadPart = StandardInfo.EndOfFile.QuadPart + liDistanceToMove.QuadPart;
break;
}
default: UNIMPLEMENTED();
}
if (NTSTATUS Status = NtSetInformationFile(hFile, &IOSB, &PositionInfo, sizeof(PositionInfo), FilePositionInformation); Status) {