Function ReadReparsePoint

util/system/fs_win.cpp:195–210

For more info see: https://docs.microsoft.com/en-us/windows/win32/fileio/reparse-points https://docs.microsoft.com/en-us/windows-hardware/drivers/ifs/fsctl-get-reparse-point https://docs.microsoft.com/en-us/windows-hardware/drivers/ddi/ntifs/ns-ntifs-_reparse_data_buffer

    // * https://docs.microsoft.com/en-us/windows-hardware/drivers/ifs/fsctl-get-reparse-point
    // * https://docs.microsoft.com/en-us/windows-hardware/drivers/ddi/ntifs/ns-ntifs-_reparse_data_buffer
    REPARSE_DATA_BUFFER* ReadReparsePoint(HANDLE h, TTempBuf& buf) {
        while (true) {
            DWORD bytesReturned = 0;
            BOOL res = DeviceIoControl(h, FSCTL_GET_REPARSE_POINT, nullptr, 0, buf.Data(), buf.Size(), &bytesReturned, nullptr);
            if (res) {
                REPARSE_DATA_BUFFER* rdb = (REPARSE_DATA_BUFFER*)buf.Data();
                return rdb;
            } else {
                if (GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
                    buf = TTempBuf(buf.Size() * 2);
                } else {
                    return nullptr;
                }
            }
        }
    }

    TString WinReadLink(const TString& name) {
        TFileHandle h = CreateFileWithUtf8Name(name, GENERIC_READ, FILE_SHARE_READ, OPEN_EXISTING,