[Bug 59176] New: MMIOINFO.lBufOffset incorrectly updated for unbuffered MMIO file handles

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59176

            Bug ID: 59176
           Summary: MMIOINFO.lBufOffset incorrectly updated for unbuffered
                    MMIO file handles
           Product: Wine
           Version: 11.0-rc2
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: winmm&mci
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 80033
  --> http://bugs.winehq.org/attachment.cgi?id=80033
Source code that reproduces the bug. Compile as 32-bit, link to Winmm.lib

For unbuffered MMIO file handles, lBufOffset is not updated the same way as on
Windows. On Windows, mmioRead() updates lBufOffset and mmioSeek() does not
update lBufOffset, while on Wine the exact opposite happens.

The attached program shows the bug. On a real Windows system (Windows 10) this
outputs:

```
info.lBufOffset: 0
info.lDiskOffset: 0
info.lBufOffset: 10
info.lDiskOffset: 0
info.lBufOffset: 40
info.lDiskOffset: 40
info.lBufOffset: 60
info.lDiskOffset: 40
```

but under Wine it instead outputs:

```
info.lBufOffset: 0
info.lDiskOffset: 0
info.lBufOffset: 10
info.lDiskOffset: 10
info.lBufOffset: 10
info.lDiskOffset: 40
info.lBufOffset: 60
info.lDiskOffset: 60
```

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