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/*
* Copyright (c) 2020, Peter Elliott <pelliott@ualberta.ca>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/StringView.h>
#include <sys/types.h>
namespace Tar {
enum FileType {
NormalFile = '0',
AlternateNormalFile = '\0',
HardLink = '1',
SymLink = '2',
CharacterSpecialFile = '3',
BlockSpecialFile = '4',
Directory = '5',
FIFO = '6',
ContiguousFile = '7',
GlobalExtendedHeader = 'g',
ExtendedHeader = 'x'
};
constexpr size_t block_size = 512;
constexpr const char* ustar_magic = "ustar ";
class Header {
public:
// FIXME: support ustar filename prefix
const StringView file_name() const { return m_file_name; }
mode_t mode() const { return get_tar_field(m_mode); }
uid_t uid() const { return get_tar_field(m_uid); }
gid_t gid() const { return get_tar_field(m_gid); }
// FIXME: support 2001-star size encoding
size_t size() const { return get_tar_field(m_size); }
time_t timestamp() const { return get_tar_field(m_timestamp); }
FileType type_flag() const { return FileType(m_type_flag); }
const StringView link_name() const { return m_link_name; }
const StringView magic() const { return StringView(m_magic, sizeof(m_magic)); }
const StringView version() const { return StringView(m_version, sizeof(m_version)); }
const StringView owner_name() const { return m_owner_name; }
const StringView group_name() const { return m_group_name; }
int major() const { return get_tar_field(m_major); }
int minor() const { return get_tar_field(m_minor); }
private:
char m_file_name[100];
char m_mode[8];
char m_uid[8];
char m_gid[8];
char m_size[12];
char m_timestamp[12];
char m_checksum[8];
char m_type_flag;
char m_link_name[100];
char m_magic[6];
char m_version[2];
char m_owner_name[32];
char m_group_name[32];
char m_major[8];
char m_minor[8];
char m_prefix[155];
template<size_t N>
static size_t get_tar_field(const char (&field)[N]);
};
template<size_t N>
size_t Header::get_tar_field(const char (&field)[N])
{
size_t value = 0;
for (size_t i = 0; i < N; ++i) {
if (field[i] == 0)
break;
ASSERT(field[i] >= '0' && field[i] <= '7');
value *= 8;
value += field[i] - '0';
}
return value;
}
}
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