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71 lines
2 KiB
C++
71 lines
2 KiB
C++
/*
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* Copyright (c) 2020, Peter Elliott <pelliott@serenityos.org>
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* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "Tar.h"
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namespace Archive {
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unsigned TarFileHeader::expected_checksum() const
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{
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auto checksum = 0u;
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u8 const* u8_this = reinterpret_cast<u8 const*>(this);
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u8 const* u8_m_checksum = reinterpret_cast<u8 const*>(&m_checksum);
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for (auto i = 0u; i < sizeof(TarFileHeader); ++i) {
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if (u8_this + i >= u8_m_checksum && u8_this + i < u8_m_checksum + sizeof(m_checksum)) {
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checksum += ' ';
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} else {
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checksum += u8_this[i];
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}
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}
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return checksum;
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}
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ErrorOr<void> TarFileHeader::calculate_checksum()
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{
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memset(m_checksum, ' ', sizeof(m_checksum));
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auto octal = TRY(String::formatted("{:06o}", expected_checksum()));
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bool copy_successful = octal.bytes_as_string_view().copy_characters_to_buffer(m_checksum, sizeof(m_checksum));
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VERIFY(copy_successful);
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return {};
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}
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bool TarFileHeader::is_zero_block() const
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{
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u8 const* buffer = reinterpret_cast<u8 const*>(this);
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for (size_t i = 0; i < sizeof(TarFileHeader); ++i) {
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if (buffer[i] != 0)
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return false;
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}
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return true;
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}
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bool TarFileHeader::content_is_like_extended_header() const
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{
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return type_flag() == TarFileType::ExtendedHeader || type_flag() == TarFileType::GlobalExtendedHeader;
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}
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void TarFileHeader::set_filename_and_prefix(StringView filename)
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{
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// FIXME: Add support for extended tar headers for longer filenames.
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VERIFY(filename.length() <= sizeof(m_filename) + sizeof(m_prefix));
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if (filename.length() <= sizeof(m_filename)) {
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set_prefix(""sv);
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set_filename(filename);
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return;
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}
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Optional<size_t> slash = filename.find('/', filename.length() - sizeof(m_filename));
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VERIFY(slash.has_value());
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set_prefix(filename.substring_view(0, slash.value() + 1));
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set_filename(filename.substring_view(slash.value() + 1));
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}
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}
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