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LibArchive: Support writing paths up to 255 characters

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The POSIX.1-1988 limit was 100, but with the ustar prefix field it's 255
(kinda).
This commit is contained in:
Peter Elliott 2022-10-24 20:47:07 -06:00 committed by Linus Groh
parent 9ae36e2035
commit 612a3324d7
Notes: sideshowbarker 2024-07-17 08:36:27 +09:00 
Author: https://github.com/petelliott
Commit: https://github.com/SerenityOS/serenity/commit/612a3324d7
Pull-request: https://github.com/SerenityOS/serenity/pull/15789
Issue: https://github.com/SerenityOS/serenity/issues/15641
Reviewed-by: https://github.com/linusg
Reviewed-by: https://github.com/timschumi ✅
3 changed files with 22 additions and 2 deletions
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18
Userland/Libraries/LibArchive/Tar.cpp
View File

@ -35,4 +35,22 @@ 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));
}
}

2
Userland/Libraries/LibArchive/Tar.h
View File

@ -130,6 +130,8 @@ public:
bool content_is_like_extended_header() const;
void set_filename_and_prefix(StringView filename);
private:
char m_filename[100] { 0 };
char m_mode[8] { 0 };

4
Userland/Libraries/LibArchive/TarStream.cpp
View File

@ -133,7 +133,7 @@ void TarOutputStream::add_directory(String const& path, mode_t mode)
VERIFY(!m_finished);
TarFileHeader header {};
header.set_size(0);
header.set_filename(String::formatted("{}/", path)); // Old tar implementations assume directory names end with a /
header.set_filename_and_prefix(String::formatted("{}/", path)); // Old tar implementations assume directory names end with a /
header.set_type_flag(TarFileType::Directory);
header.set_mode(mode);
header.set_magic(gnu_magic);
@ -149,7 +149,7 @@ void TarOutputStream::add_file(String const& path, mode_t mode, ReadonlyBytes by
VERIFY(!m_finished);
TarFileHeader header {};
header.set_size(bytes.size());
header.set_filename(path);
header.set_filename_and_prefix(path);
header.set_type_flag(TarFileType::NormalFile);
header.set_mode(mode);
header.set_magic(gnu_magic);