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LibArchive: Implement proper support for Tar file end markers

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Previously this was handled implicitly, as our implementation of Tar
would just stop processing input as soon as it found something invalid.
However, since we now error out as soon as something is found to be
wrong, we require proper handling for zero blocks, which aren't actually
fatal.
This commit is contained in:
Tim Schumacher 2022-11-29 01:01:13 +01:00 • committed by Andreas Kling
parent cb48b9bc30
commit 714f0c3dce
4 changed files with 33 additions and 7 deletions
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10
Userland/Libraries/LibArchive/Tar.cpp
View file

@ -30,6 +30,16 @@ void TarFileHeader::calculate_checksum()
VERIFY(String::formatted("{:06o}", expected_checksum()).copy_characters_to_buffer(m_checksum, sizeof(m_checksum)));
}
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;