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diff --git a/src/lib/util/tape_file_interface.h b/src/lib/util/tape_file_interface.h
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+// license:BSD-3-Clause
+// copyright-holders:Mietek Bak
+
+#ifndef MAME_LIB_UTIL_TAPE_FILE_INTERFACE_H
+#define MAME_LIB_UTIL_TAPE_FILE_INTERFACE_H
+
+#pragma once
+
+#include <utility>
+
+//////////////////////////////////////////////////////////////////////////////
+
+enum class tape_status : u8 {
+ OK, // oll korrekt
+ BOM, // beginning of medium
+ EW, // early warning
+ FILEMARK, // filemark
+ FILEMARK_EW, // filemark and early warning
+ SETMARK, // setmark
+ SETMARK_EW, // setmark and early warning
+ EOD, // end of data
+ EOD_EW, // end of data and early warning
+ UNKNOWN, // unknown
+ UNKNOWN_EW, // unknown and early warning
+ EOM // end of medium
+};
+
+class tape_file_interface
+{
+public:
+ // construction
+ virtual ~tape_file_interface() {}
+
+ // position-preserving operations
+ virtual const bool is_read_only() const = 0;
+ virtual const bool is_ew() const = 0;
+ virtual const u8 get_density_code() const = 0;
+ virtual const std::pair<const tape_status, const u32> read_position() const = 0;
+
+ // non-destructive operations
+ virtual void rewind(const bool eom) = 0;
+ virtual const tape_status locate_block(const u32 req_block_addr) = 0;
+ virtual const tape_status space_eod() = 0;
+ virtual const std::pair<const tape_status, const u32> space_blocks(const u32 req_blocks_num) = 0;
+ virtual const std::pair<const tape_status, const u32> space_filemarks(const u32 req_marks_num, const bool setmarks = false, const bool sequential = false) = 0;
+ virtual const std::pair<const tape_status, const u32> space_blocks_reverse(const u32 req_blocks_num) = 0;
+ virtual const std::pair<const tape_status, const u32> space_filemarks_reverse(const u32 req_marks_num, const bool setmarks = false, const bool sequential = false) = 0;
+ virtual const std::pair<const tape_status, const u32> read_block(u8 *const buf, const u32 buf_size) = 0;
+
+ // destructive operations
+ virtual void erase(const bool eom) = 0;
+ virtual const tape_status write_block(const u8 *const buf, const u32 len) = 0;
+ virtual const tape_status write_filemarks(const u32 req_marks_num, const bool setmarks = false) = 0;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+#endif // MAME_LIB_UTIL_TAPE_FILE_INTERFACE_H