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https://github.com/RGBCube/serenity
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5d180d1f99
(...and ASSERT_NOT_REACHED => VERIFY_NOT_REACHED) Since all of these checks are done in release builds as well, let's rename them to VERIFY to prevent confusion, as everyone is used to assertions being compiled out in release. We can introduce a new ASSERT macro that is specifically for debug checks, but I'm doing this wholesale conversion first since we've accumulated thousands of these already, and it's not immediately obvious which ones are suitable for ASSERT.
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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VERIFY(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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