mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-22 23:50:19 +00:00
683c08744a
These are all actually fine, there is no UAF here. But once e.g. `ByteString::view() &&` is deleted, these instances won't compile.
71 lines
2 KiB
C++
71 lines
2 KiB
C++
/*
|
|
* Copyright (c) 2020, Peter Elliott <pelliott@serenityos.org>
|
|
* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include "Tar.h"
|
|
|
|
namespace Archive {
|
|
|
|
unsigned TarFileHeader::expected_checksum() const
|
|
{
|
|
auto checksum = 0u;
|
|
u8 const* u8_this = reinterpret_cast<u8 const*>(this);
|
|
u8 const* u8_m_checksum = reinterpret_cast<u8 const*>(&m_checksum);
|
|
for (auto i = 0u; i < sizeof(TarFileHeader); ++i) {
|
|
if (u8_this + i >= u8_m_checksum && u8_this + i < u8_m_checksum + sizeof(m_checksum)) {
|
|
checksum += ' ';
|
|
} else {
|
|
checksum += u8_this[i];
|
|
}
|
|
}
|
|
return checksum;
|
|
}
|
|
|
|
ErrorOr<void> TarFileHeader::calculate_checksum()
|
|
{
|
|
memset(m_checksum, ' ', sizeof(m_checksum));
|
|
|
|
auto octal = TRY(String::formatted("{:06o}", expected_checksum()));
|
|
bool copy_successful = octal.bytes_as_string_view().copy_characters_to_buffer(m_checksum, sizeof(m_checksum));
|
|
VERIFY(copy_successful);
|
|
|
|
return {};
|
|
}
|
|
|
|
bool TarFileHeader::is_zero_block() const
|
|
{
|
|
u8 const* buffer = reinterpret_cast<u8 const*>(this);
|
|
for (size_t i = 0; i < sizeof(TarFileHeader); ++i) {
|
|
if (buffer[i] != 0)
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool TarFileHeader::content_is_like_extended_header() const
|
|
{
|
|
return type_flag() == TarFileType::ExtendedHeader || type_flag() == TarFileType::GlobalExtendedHeader;
|
|
}
|
|
|
|
void TarFileHeader::set_filename_and_prefix(StringView filename)
|
|
{
|
|
// FIXME: Add support for extended tar headers for longer filenames.
|
|
VERIFY(filename.length() <= sizeof(m_filename) + sizeof(m_prefix));
|
|
|
|
if (filename.length() <= sizeof(m_filename)) {
|
|
set_prefix(""sv);
|
|
set_filename(filename);
|
|
return;
|
|
}
|
|
|
|
Optional<size_t> slash = filename.find('/', filename.length() - sizeof(m_filename));
|
|
|
|
VERIFY(slash.has_value());
|
|
set_prefix(filename.substring_view(0, slash.value() + 1));
|
|
set_filename(filename.substring_view(slash.value() + 1));
|
|
}
|
|
|
|
}
|