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QFileSystemEngine::id/Windows: Use the volume ID too

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The MS documentation says that the high/low parts uniquely identify a
file within a system, but they actually mean the filesystem. The details
on how it's allocated make that clear. So we need the volume identifier.

Change-Id: I658f552684924f8aa2cafffd14cfc03c5a09c0e9
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Kai Koehne <kai.koehne@qt.io>
Reviewed-by: Maurice Kalinowski <maurice.kalinowski@qt.io>
This commit is contained in:
Thiago Macieira 2017-07-09 12:29:26 -07:00
parent 3f18dadeeb
commit c0bd7ade1a
1 changed files with 7 additions and 5 deletions
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12
src/corelib/io/qfilesystemengine_win.cpp
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@ -571,19 +571,21 @@ typedef struct _FILE_ID_INFO {
// File ID for Windows up to version 7.
static inline QByteArray fileId(HANDLE handle)
{
QByteArray result;
#ifndef Q_OS_WINRT
BY_HANDLE_FILE_INFORMATION info;
if (GetFileInformationByHandle(handle, &info)) {
result = QByteArray::number(uint(info.nFileIndexLow), 16);
result += ':';
result += QByteArray::number(uint(info.nFileIndexHigh), 16);
char buffer[sizeof "01234567:0123456701234567"];
qsnprintf(buffer, sizeof(buffer), "%lx:%08lx%08lx",
info.dwVolumeSerialNumber,
info.nFileIndexHigh,
info.nFileIndexLow);
return buffer;
}
#else // !Q_OS_WINRT
Q_UNUSED(handle);
Q_UNIMPLEMENTED();
#endif // Q_OS_WINRT
return result;
return QByteArray();
}
// File ID for Windows starting from version 8.