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/*
* 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 {};
}
}
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