[Bug 2506] New: Fallout installer reports incorrect disk space

[Wine Bugs]

http://bugs.winehq.org/show_bug.cgi?id=2506

           Summary: Fallout installer reports incorrect disk space
           Product: Wine
           Version: unspecified
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: wine-kernel
        AssignedTo: wine-bugs at winehq.org
        ReportedBy: wsapplegate at myrealbox.com


Executive summary : 
~~~~~~~~~~~~~~~~~~~ 
 
Fallout is an old (circa 1997) RPG, published by Interplay. The game doesn't 
use a standard installer (like InstallShield or similar). Rather, Interplay 
did write a custom installer. While recently trying to reinstall this game, I 
was confronted to a weird problem : the reported disk space was about 268 MiB 
instead of 2147 MiB as previously reported. Both values are in fact incorrect 
(the hard disk has much more than 2 GiB), but the latter allows for a complete 
installation, while the former only allows a limited installation, the 
remainder being read from the CD-ROM. 
 
Analysis : 
~~~~~~~~~~ 
A quick investigation shows that the problem only occurs since WINE 20040505. 
Not coincidentally, this version contains changes to the GetDiskFreeSpace* 
functions. Tracing the _SETUP.EXE function calls, it indeed appears it makes 
calls to GetDiskFreeSpaceA(), which in turn calls GetDiskFreeSpaceW(). This 
functions returns values capped at 2 GiB, with the following parameters : 4096 
bytes per sector, 1 sector per cluster, 524287 clusters. From the behaviour 
exhibited by the installer, it unfortunately appears the programmers used a 
16-bit sized variable to store the clusters value, thus generating incorrect 
results when this number is above 65535, as reported by the new 
GetDiskFreeSpaceW(). 
 
How to reproduce : 
~~~~~~~~~~~~~~~~~~ 
You need (1) a HDD with more than 2 GiB free space and (2) a copy of Fallout. 
Then, execute the following steps (assuming your CD-ROM is mounted as D:) 
 
* run "wine 'd:\\_setup.exe'" 
* notice the free space reported for the hard disk is incorrect 
 
Solutions and workarounds : 
~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
I personally solved the problem by kludging the GetDiskFreeSpaceW() function 
in dlls/kernel/volume.c to report a number of cluster below 65535 (for a 2 GiB 
disk, it reports 512 bytes * 64 sectors * 65535 clusters), but it's most 
probably incorrect (these values are not consistent with the values reported 
by NtQueryVolumeInformationFile()). If you run

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