bug#1524 - shgetfileinfo

[Ann and Jason Edmeades <us@the-edmeades.demon.co.uk>]

Just fancied a change. A simple testpgm shows windows allows a null psfi
because you can use it to quickly determine an exe type. Test shows both
the A and W versions should handle null pointers regardless of the size
value passed in.

Changelog

SHGetFileInfo should tollerate null pointers

Jason

Index: dlls/shell32/shell32_main.c
===================================================================
RCS file: /home/wine/wine/dlls/shell32/shell32_main.c,v
retrieving revision 1.115
diff -u -r1.115 shell32_main.c
--- dlls/shell32/shell32_main.c	13 May 2003 22:19:01 -0000	1.115
+++ dlls/shell32/shell32_main.c	19 Jun 2003 20:33:58 -0000
@@ -225,9 +225,11 @@
 	  return FALSE;
 
 	/* windows initializes this values regardless of the flags */
-	psfi->szDisplayName[0] = '\0';
-	psfi->szTypeName[0] = '\0';
-	psfi->iIcon = 0;
+        if (psfi != NULL) {
+	    psfi->szDisplayName[0] = '\0';
+	    psfi->szTypeName[0] = '\0';
+	    psfi->iIcon = 0;
+        }
 
        if (!(flags & SHGFI_PIDL)){
             /* SHGitFileInfo should work with absolute and relative paths */
@@ -297,6 +299,9 @@
 	  return 0;
       }
 
+      /* psfi is NULL normally to query EXE type, if not none of the below makes 
+           sense anyway. Windows allows this and just returns FALSE              */
+      if (psfi != NULL) return FALSE;
 
 	/* translate the path into a pidl only when SHGFI_USEFILEATTRIBUTES
     	 * is not specified.
@@ -496,20 +501,20 @@
 	  WideCharToMultiByte(CP_ACP, 0, path, -1, temppath, len, NULL, NULL);
 	}
 
-       if(flags & SHGFI_ATTR_SPECIFIED)
+       if(psfi && (flags & SHGFI_ATTR_SPECIFIED))
                temppsfi.dwAttributes=psfi->dwAttributes;
 
-	ret = SHGetFileInfoA(temppath, dwFileAttributes, &temppsfi, sizeof(temppsfi), flags);
+	ret = SHGetFileInfoA(temppath, dwFileAttributes, (psfi == NULL)? NULL : &temppsfi, sizeof(temppsfi), flags);
 
-       if(flags & SHGFI_ICON)
+       if(psfi && (flags & SHGFI_ICON))
                psfi->hIcon=temppsfi.hIcon;
-       if(flags & (SHGFI_SYSICONINDEX|SHGFI_ICON|SHGFI_ICONLOCATION))
+       if(psfi && (flags & (SHGFI_SYSICONINDEX|SHGFI_ICON|SHGFI_ICONLOCATION)))
                psfi->iIcon=temppsfi.iIcon;
-       if(flags & SHGFI_ATTRIBUTES)
+       if(psfi && (flags & SHGFI_ATTRIBUTES))
                psfi->dwAttributes=temppsfi.dwAttributes;
-       if(flags & (SHGFI_DISPLAYNAME|SHGFI_ICONLOCATION))
+       if(psfi && (flags & (SHGFI_DISPLAYNAME|SHGFI_ICONLOCATION)))
                MultiByteToWideChar(CP_ACP, 0, temppsfi.szDisplayName, -1, psfi->szDisplayName, sizeof(psfi->szDisplayName));
-       if(flags & SHGFI_TYPENAME)
+       if(psfi && (flags & SHGFI_TYPENAME))
                MultiByteToWideChar(CP_ACP, 0, temppsfi.szTypeName, -1, psfi->szTypeName, sizeof(psfi->szTypeName));
 
         if(!(flags & SHGFI_PIDL)) HeapFree(GetProcessHeap(), 0, temppath);