msi: Add support for the ActionInfo progress message subtype.

dlls/msi/action.c

@@ -7340,6 +7340,7 @@ UINT ACTION_PerformUIAction(MSIPACKAGE *package, const WCHAR *action, UINT scrip
 
     TRACE("Performing action (%s)\n", debugstr_w(action));
 
+    package->action_progress_increment = 0;
     handled = ACTION_HandleStandardAction(package, action, &rc);
 
     if (!handled)

dlls/msi/dialog.c

@@ -664,7 +664,9 @@ void msi_dialog_handle_event( msi_dialog* dialog, LPCWSTR control,
                 SendMessageW( ctrl->hwnd, PBM_SETPOS, 0, 0 );
             }
             break;
-        case 1: /* FIXME: not sure what this is supposed to do */
+        case 1: /* action data increment */
+            if (val2) dialog->package->action_progress_increment = val1;
+            else dialog->package->action_progress_increment = 0;
             break;
         case 2: /* move */
             if (ctrl->progress_backwards)

dlls/msi/msipriv.h

@@ -369,6 +369,7 @@ typedef struct tagMSIPACKAGE
     struct list cabinet_streams;
     LPWSTR ActionFormat;
     LPWSTR LastAction;
+    UINT   action_progress_increment;
     HANDLE log_file;
     IAssemblyCache *cache_net[CLR_VERSION_MAX];
     IAssemblyCache *cache_sxs;

dlls/msi/package.c

@@ -1905,8 +1905,16 @@ INT MSI_ProcessMessage( MSIPACKAGE *package, INSTALLMESSAGE eMessageType, MSIREC
         msi_free(deformated);
 
         ControlEvent_FireSubscribedEvent(package, szActionData, uirow);
-
         msiobj_release(&uirow->hdr);
+
+        if (package->action_progress_increment)
+        {
+            uirow = MSI_CreateRecord(2);
+            MSI_RecordSetInteger(uirow, 1, 2);
+            MSI_RecordSetInteger(uirow, 2, package->action_progress_increment);
+            ControlEvent_FireSubscribedEvent(package, szSetProgress, uirow);
+            msiobj_release(&uirow->hdr);
+        }
         break;
 
     case INSTALLMESSAGE_ACTIONSTART: