winedos: open files with write access on read only media. -- RESENT

[Rein Klazes]

Hi,

Resending: not in the new release, no comments.


Application, Elektor magazine CD 1996 browser, opens file on CDROM with
RW access and fails with ERROR_WRITE_ACCESS followed by a crash. A DOS
test program shows that the call should have succeeded.

Changelog:
dlls/winedos	: int21.c
If the CreateFile in INT21_CreateFile fails with ERROR_WRITE_ACCESS,
retry without write access.

Rein.
-------------- next part --------------
--- wine/dlls/winedos/int21.c	2005-10-17 12:49:35.000000000 +0200
+++ mywine/dlls/winedos/int21.c	2005-12-22 18:59:09.000000000 +0100
@@ -1090,6 +1090,12 @@ static BOOL INT21_CreateFile( CONTEXT86 
     {
         winHandle = CreateFileW( pathW, winAccess, winSharing, NULL,
                                  winMode, winAttributes, 0 );
+        /* DOS allows to open files on a CDROM R/W */
+        if( winHandle == INVALID_HANDLE_VALUE &&
+                GetLastError()== ERROR_WRITE_PROTECT) {
+            winHandle = CreateFileW( pathW, winAccess & ~GENERIC_WRITE,
+                    winSharing, NULL, winMode, winAttributes, 0 );
+        }
 
         if (winHandle == INVALID_HANDLE_VALUE)
             return FALSE;