part final please god

src/engine/fileOps/importExport.h

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+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2024 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.
+ */
+
+#pragma once
+
+#include "../dataErrors.h"
+#include "../engine.h"
+#include "../../ta-log.h"
+#include "../instrument.h"
+#include "../song.h"
+#include <zlib.h>
+#include <fmt/printf.h>
+
+#define DIV_READ_SIZE 131072
+#define DIV_DMF_MAGIC ".DelekDefleMask."
+#define DIV_FUR_MAGIC "-Furnace module-"
+#define DIV_FTM_MAGIC "FamiTracker Module"
+#define DIV_DN_FTM_MAGIC "Dn-FamiTracker Module"
+#define DIV_FC13_MAGIC "SMOD"
+#define DIV_FC14_MAGIC "FC14"
+#define DIV_S3M_MAGIC "SCRM"
+#define DIV_XM_MAGIC "Extended Module: "
+#define DIV_IT_MAGIC "IMPM"
+#define DIV_TFM_MAGIC "TFMfmtV2"
+
+enum DivFurVariants: int {
+  DIV_FUR_VARIANT_VANILLA=0,
+  DIV_FUR_VARIANT_B=1,
+};

src/engine/fileOps/shared.h

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+/**
+ * Furnace Tracker - multi-system chiptune tracker
+ * Copyright (C) 2021-2024 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.
+ */
+
+#pragma once
+
+#include "importExport.h"
+
+// MIDI-related
+struct midibank_t {
+  String name;
+  uint8_t bankMsb,
+          bankLsb;
+};
+
+// Reused patch data structures
+
+// SBI and some other OPL containers
+
+struct sbi_t {
+  uint8_t Mcharacteristics,
+          Ccharacteristics,
+          Mscaling_output,
+          Cscaling_output,
+          Meg_AD,
+          Ceg_AD,
+          Meg_SR,
+          Ceg_SR,
+          Mwave,
+          Cwave,
+          FeedConnect;
+};
+
+bool stringNotBlank(String& str);
+// detune needs extra translation from register to furnace format
+uint8_t fmDtRegisterToFurnace(uint8_t&& dtNative);
+
+void readSbiOpData(sbi_t& sbi, SafeReader& reader);