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// license:BSD-3-Clause
// copyright-holders:Mietek Bak
#ifndef MAME_UTIL_TAPE_FILE_INTERFACE_H
#define MAME_UTIL_TAPE_FILE_INTERFACE_H
#pragma once
#include <cstdint>
#include <utility>
//////////////////////////////////////////////////////////////////////////////
enum class tape_status : std::uint8_t {
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 bool is_read_only() const = 0;
virtual bool is_ew() const = 0;
virtual std::uint8_t get_density_code() const = 0;
virtual std::pair<tape_status, std::uint32_t> read_position() const = 0;
// non-destructive operations
virtual void rewind(bool eom) = 0;
virtual tape_status locate_block(std::uint32_t req_block_addr) = 0;
virtual tape_status space_eod() = 0;
virtual std::pair<tape_status, std::uint32_t> space_blocks(std::uint32_t req_blocks_num) = 0;
virtual std::pair<tape_status, std::uint32_t> space_filemarks(std::uint32_t req_marks_num, bool setmarks = false, bool sequential = false) = 0;
virtual std::pair<tape_status, std::uint32_t> space_blocks_reverse(std::uint32_t req_blocks_num) = 0;
virtual std::pair<tape_status, std::uint32_t> space_filemarks_reverse(std::uint32_t req_marks_num, bool setmarks = false, bool sequential = false) = 0;
virtual std::pair<tape_status, std::uint32_t> read_block(std::uint8_t *buf, std::uint32_t buf_size) = 0;
// destructive operations
virtual void erase(bool eom) = 0;
virtual tape_status write_block(const std::uint8_t *buf, std::uint32_t len) = 0;
virtual tape_status write_filemarks(std::uint32_t req_marks_num, bool setmarks = false) = 0;
};
//////////////////////////////////////////////////////////////////////////////
#endif // MAME_UTIL_TAPE_FILE_INTERFACE_H
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