77 lines
1.7 KiB
C++
77 lines
1.7 KiB
C++
/*
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* \brief TAR record
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* \author Norman Feske
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* \date 2012-08-20
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*/
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/*
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* Copyright (C) 2012-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _RECORD_H_
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#define _RECORD_H_
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/* Genode includes */
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#include <util/string.h>
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namespace File_system {
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class Record
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{
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private:
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char _name[100];
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char _mode[8];
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char _uid[8];
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char _gid[8];
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char _size[12];
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char _mtime[12];
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char _checksum[8];
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char _type[1];
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char _linked_name[100];
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/**
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* Convert ASCII-encoded octal number to unsigned value
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*/
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template <typename T>
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unsigned long _read(T const &field) const
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{
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/*
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* Copy-out ASCII string to temporary buffer that is
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* large enough to host an additional zero.
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*/
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char buf[sizeof(field) + 1];
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strncpy(buf, field, sizeof(buf));
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unsigned long value = 0;
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ascii_to_unsigned_long(buf, value, 8);
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return value;
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}
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public:
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/* length of on data block in tar */
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enum { BLOCK_LEN = 512 };
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/* record type values */
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enum { TYPE_FILE = 0, TYPE_HARDLINK = 1,
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TYPE_SYMLINK = 2, TYPE_DIR = 5 };
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size_t size() const { return _read(_size); }
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unsigned uid() const { return _read(_uid); }
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unsigned gid() const { return _read(_gid); }
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unsigned mode() const { return _read(_mode); }
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unsigned type() const { return _read(_type); }
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char const *name() const { return _name; }
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char const *linked_name() const { return _linked_name; }
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void *data() const { return (char *)this + BLOCK_LEN; }
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};
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}
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#endif /* _RECORD_H_ */
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