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