mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-20 17:58:18 +03:00
118 lines
3.7 KiB
C++
118 lines
3.7 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
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/Span.h>
|
|
#include <AK/Stream.h>
|
|
#include <LibArchive/Tar.h>
|
|
|
|
namespace Archive {
|
|
|
|
class TarInputStream;
|
|
|
|
class TarFileStream : public InputStream {
|
|
public:
|
|
size_t read(Bytes) override;
|
|
bool unreliable_eof() const override;
|
|
|
|
bool read_or_error(Bytes) override;
|
|
bool discard_or_error(size_t count) override;
|
|
|
|
private:
|
|
TarFileStream(TarInputStream& stream);
|
|
TarInputStream& m_tar_stream;
|
|
int m_generation;
|
|
|
|
friend class TarInputStream;
|
|
};
|
|
|
|
class TarInputStream {
|
|
public:
|
|
TarInputStream(InputStream&);
|
|
void advance();
|
|
bool finished() const { return m_finished; }
|
|
bool valid() const;
|
|
TarFileHeader const& header() const { return m_header; }
|
|
TarFileStream file_contents();
|
|
|
|
template<VoidFunction<StringView, StringView> F>
|
|
ErrorOr<void> for_each_extended_header(F func);
|
|
|
|
private:
|
|
TarFileHeader m_header;
|
|
InputStream& m_stream;
|
|
unsigned long m_file_offset { 0 };
|
|
int m_generation { 0 };
|
|
bool m_finished { false };
|
|
|
|
friend class TarFileStream;
|
|
};
|
|
|
|
class TarOutputStream {
|
|
public:
|
|
TarOutputStream(OutputStream&);
|
|
void add_file(String const& path, mode_t, ReadonlyBytes);
|
|
void add_directory(String const& path, mode_t);
|
|
void finish();
|
|
|
|
private:
|
|
OutputStream& m_stream;
|
|
bool m_finished { false };
|
|
|
|
friend class TarFileStream;
|
|
};
|
|
|
|
template<VoidFunction<StringView, StringView> F>
|
|
inline ErrorOr<void> TarInputStream::for_each_extended_header(F func)
|
|
{
|
|
VERIFY(header().content_is_like_extended_header());
|
|
|
|
Archive::TarFileStream file_stream = file_contents();
|
|
|
|
ByteBuffer file_contents_buffer = TRY(ByteBuffer::create_zeroed(header().size()));
|
|
VERIFY(file_stream.read(file_contents_buffer) == header().size());
|
|
|
|
StringView file_contents { file_contents_buffer };
|
|
|
|
while (!file_contents.is_empty()) {
|
|
// Split off the length (until the first space).
|
|
Optional<size_t> length_end_index = file_contents.find(' ');
|
|
if (!length_end_index.has_value())
|
|
return Error::from_string_literal("Malformed extended header: No length found.");
|
|
Optional<unsigned int> length = file_contents.substring_view(0, length_end_index.value()).to_uint();
|
|
if (!length.has_value())
|
|
return Error::from_string_literal("Malformed extended header: Could not parse length.");
|
|
unsigned int remaining_length = length.value();
|
|
|
|
remaining_length -= length_end_index.value() + 1;
|
|
file_contents = file_contents.substring_view(length_end_index.value() + 1);
|
|
|
|
// Extract the header.
|
|
StringView header = file_contents.substring_view(0, remaining_length - 1);
|
|
file_contents = file_contents.substring_view(remaining_length - 1);
|
|
|
|
// Ensure that the header ends at the expected location.
|
|
if (file_contents.length() < 1 || !file_contents.starts_with('\n'))
|
|
return Error::from_string_literal("Malformed extended header: Header does not end at expected location.");
|
|
file_contents = file_contents.substring_view(1);
|
|
|
|
// Find the delimiting '='.
|
|
Optional<size_t> header_delimiter_index = header.find('=');
|
|
if (!header_delimiter_index.has_value())
|
|
return Error::from_string_literal("Malformed extended header: Header does not have a delimiter.");
|
|
StringView key = header.substring_view(0, header_delimiter_index.value());
|
|
StringView value = header.substring_view(header_delimiter_index.value() + 1);
|
|
|
|
func(key, value);
|
|
}
|
|
|
|
return {};
|
|
}
|
|
|
|
}
|