Untested version of GetInstalledDepots.

dll/steam_apps.cpp

@@ -181,7 +181,32 @@ bool Steam_Apps::MarkContentCorrupt( bool bMissingFilesOnly )
 // return installed depots in mount order
 uint32 Steam_Apps::GetInstalledDepots( AppId_t appID, DepotId_t *pvecDepots, uint32 cMaxDepots )
 {
-    PRINT_DEBUG("GetInstalledDepots\n");
+    PRINT_DEBUG("GetInstalledDepots %u\n", appID);
+    //TODO not sure about the behavior of this function, I didn't actually test this.
+    if (!pvecDepots) return 0;
+    std::lock_guard<std::recursive_mutex> lock(global_mutex);
+
+    if (appID == settings->get_local_game_id().AppID()) {
+        unsigned int count = settings->DLCCount();
+        if (cMaxDepots < count) count = cMaxDepots;
+
+        for (int i = 0; i < count; ++i) {
+            AppId_t appid;
+            bool available;
+            std::string name;
+            if (settings->getDLC(i, appid, available, name)) {
+                pvecDepots[i] = appid;
+            }
+        }
+
+        return count;
+    } else {
+        if (cMaxDepots) {
+            *pvecDepots = appID;
+            return 1;
+        }
+    }
+
     return 0;
 }