Fixed an error bug

src/asset/asset.h

@@ -7,7 +7,9 @@
 
 #pragma once
 #include "assetpaletteimage.h"
+#include "error/error.h"
 #include "util/reflist.h"
+#include <zip.h>
 
 #define ASSET_HEADER_SIZE 3
 #define ASSET_REFERENCE_COUNT_MAX 8
@@ -31,4 +33,15 @@ typedef struct {
   assetstate_t state;
   assettype_t type;
   void *data;
-} asset_t;
+  zip_file_t *file;
+} asset_t;
+
+/**
+ * Initializes an asset structure. This should be called by the asset manager
+ * only.
+ * 
+ * @param asset The asset structure to initialize.
+ * @param filename The filename of the asset.
+ * @return An error code.
+ */
+errorret_t assetInit(asset_t *asset, const char_t *filename);