prepare to add ROM export framework

src/engine/export.h

@@ -0,0 +1,63 @@
+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2023 tildearrow and contributors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef _EXPORT_H
+#define _EXPORT_H
+
+#include "song.h"
+#include <vector>
+
+class DivEngine;
+
+enum DivROMExportOptions {
+  DIV_ROM_ABSTRACT=0,
+  DIV_ROM_AMIGA_VALIDATION,
+
+  DIV_ROM_MAX
+};
+
+struct DivROMExportOutput {
+  String name;
+  SafeWriter* data;
+  
+  DivROMExportOutput(String n, SafeWriter* d):
+    name(n),
+    data(d) {}
+  DivROMExportOutput():
+    name(""),
+    data(NULL) {}
+};
+
+class DivROMExport {
+  const char* name;
+  const char* author;
+  const char* description;
+  DivSystem requisites[32];
+  int requisitesLen;
+  bool multiOutput;
+
+  public:
+    virtual std::vector<DivROMExportOutput> go(DivEngine* e);
+    DivROMExport(const char* n, const char* auth, const char* desc):
+      name(n),
+      author(auth),
+      description(desc) {}
+};
+
+#endif