Eric Pouech : winmm: Only compute dwFileSize for MMIO objects with a DOS ioproc.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 258d42982cf526b3d9c59ccb522b27db3f519541
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=258d42982cf526b3d9c59ccb522b27db3f519541

Author: Eric Pouech <eric.pouech at orange.fr>
Date:   Sun Jun 13 15:41:01 2010 +0200

winmm: Only compute dwFileSize for MMIO objects with a DOS ioproc.

---

 dlls/winmm/mmio.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/dlls/winmm/mmio.c b/dlls/winmm/mmio.c
index 75439a4..f13e090 100644
--- a/dlls/winmm/mmio.c
+++ b/dlls/winmm/mmio.c
@@ -667,7 +667,13 @@ static HMMIO MMIO_Open(LPSTR szFileName, MMIOINFO* refmminfo, DWORD dwOpenFlags,
                                         (LPARAM)szFileName, 0, FALSE);
 
     /* grab file size, when possible */
-    if ((pos = _llseek((HFILE)wm->info.adwInfo[0], 0, SEEK_CUR)) != -1)
+    /* FIXME: the code around dwFileSize is:
+     * - probably broken
+     * - needs to be tested when the app installs its own IOproc
+     * - likely to be removed
+     * So, restrict dwFileSize usage to DOS ioprocs
+     */
+    if (wm->info.fccIOProc == FOURCC_DOS && (pos = _llseek((HFILE)wm->info.adwInfo[0], 0, SEEK_CUR)) != -1)
     {
         wm->dwFileSize = _llseek((HFILE)wm->info.adwInfo[0], 0, SEEK_END);
         _llseek((HFILE)wm->info.adwInfo[0], pos, SEEK_SET);