mirror of
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124 lines
4.1 KiB
C++
124 lines
4.1 KiB
C++
/*
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* Copyright (c) 2020, Peter Elliott <pelliott@serenityos.org>
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* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/MaybeOwned.h>
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#include <AK/Span.h>
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#include <AK/Stream.h>
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#include <LibArchive/Tar.h>
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namespace Archive {
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class TarInputStream;
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class TarFileStream : public Stream {
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public:
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virtual ErrorOr<Bytes> read_some(Bytes) override;
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virtual ErrorOr<size_t> write_some(ReadonlyBytes) override;
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virtual bool is_eof() const override;
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virtual bool is_open() const override { return true; }
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virtual void close() override {};
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private:
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TarFileStream(TarInputStream& stream);
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TarInputStream& m_tar_stream;
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int m_generation;
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friend class TarInputStream;
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};
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class TarInputStream {
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public:
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static ErrorOr<NonnullOwnPtr<TarInputStream>> construct(NonnullOwnPtr<Stream>);
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ErrorOr<void> advance();
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bool finished() const { return m_found_end_of_archive || m_stream->is_eof(); }
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ErrorOr<bool> valid() const;
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TarFileHeader const& header() const { return m_header; }
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TarFileStream file_contents();
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template<VoidFunction<StringView, StringView> F>
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ErrorOr<void> for_each_extended_header(F func);
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private:
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TarInputStream(NonnullOwnPtr<Stream>);
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ErrorOr<void> load_next_header();
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TarFileHeader m_header;
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NonnullOwnPtr<Stream> m_stream;
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unsigned long m_file_offset { 0 };
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int m_generation { 0 };
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bool m_found_end_of_archive { false };
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friend class TarFileStream;
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};
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class TarOutputStream {
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public:
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TarOutputStream(MaybeOwned<Stream>);
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ErrorOr<void> add_file(StringView path, mode_t, ReadonlyBytes);
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ErrorOr<void> add_link(StringView path, mode_t, StringView);
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ErrorOr<void> add_directory(StringView path, mode_t);
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ErrorOr<void> finish();
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private:
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MaybeOwned<Stream> m_stream;
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bool m_finished { false };
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friend class TarFileStream;
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};
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template<VoidFunction<StringView, StringView> F>
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inline ErrorOr<void> TarInputStream::for_each_extended_header(F func)
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{
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VERIFY(header().content_is_like_extended_header());
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Archive::TarFileStream file_stream = file_contents();
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auto header_size = TRY(header().size());
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ByteBuffer file_contents_buffer = TRY(ByteBuffer::create_zeroed(header_size));
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TRY(file_stream.read_until_filled(file_contents_buffer));
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StringView file_contents { file_contents_buffer };
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while (!file_contents.is_empty()) {
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// Split off the length (until the first space).
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Optional<size_t> length_end_index = file_contents.find(' ');
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if (!length_end_index.has_value())
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return Error::from_string_literal("Malformed extended header: No length found.");
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Optional<unsigned int> length = file_contents.substring_view(0, length_end_index.value()).to_uint();
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if (!length.has_value())
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return Error::from_string_literal("Malformed extended header: Could not parse length.");
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unsigned int remaining_length = length.value();
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remaining_length -= length_end_index.value() + 1;
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file_contents = file_contents.substring_view(length_end_index.value() + 1);
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// Extract the header.
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StringView header = file_contents.substring_view(0, remaining_length - 1);
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file_contents = file_contents.substring_view(remaining_length - 1);
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// Ensure that the header ends at the expected location.
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if (file_contents.length() < 1 || !file_contents.starts_with('\n'))
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return Error::from_string_literal("Malformed extended header: Header does not end at expected location.");
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file_contents = file_contents.substring_view(1);
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// Find the delimiting '='.
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Optional<size_t> header_delimiter_index = header.find('=');
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if (!header_delimiter_index.has_value())
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return Error::from_string_literal("Malformed extended header: Header does not have a delimiter.");
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StringView key = header.substring_view(0, header_delimiter_index.value());
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StringView value = header.substring_view(header_delimiter_index.value() + 1);
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func(key, value);
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}
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return {};
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}
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}
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