implement download and open from the cloud browser

engine/util.cpp

@@ -132,6 +132,13 @@ size_t curl_data_handler(void *contents, size_t size, size_t nmemb, void *userp)
     return size * nmemb;
 }
 
+size_t curl_data_write(void *ptr, size_t size, size_t nmemb, FILE *stream)
+{
+    size_t written = fwrite(ptr, size, nmemb, stream);
+    return written;
+}
+
+
 #ifdef _DEBUG
 #define GL(stmt) stmt; CheckOpenGLError(#stmt, __FILE__, __LINE__);
 #else