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103 lines
2.9 KiB
C++
103 lines
2.9 KiB
C++
/*
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* Copyright (c) 2020-2022, the SerenityOS developers.
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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/NonnullOwnPtr.h>
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#include <AK/OwnPtr.h>
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#include <AK/Stream.h>
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#include <LibCompress/Deflate.h>
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#include <LibCrypto/Checksum/CRC32.h>
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namespace Compress {
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constexpr u8 gzip_magic_1 = 0x1f;
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constexpr u8 gzip_magic_2 = 0x8b;
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struct [[gnu::packed]] BlockHeader {
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u8 identification_1;
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u8 identification_2;
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u8 compression_method;
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u8 flags;
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LittleEndian<u32> modification_time;
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u8 extra_flags;
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u8 operating_system;
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bool valid_magic_number() const;
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bool supported_by_implementation() const;
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};
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struct Flags {
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static constexpr u8 FTEXT = 1 << 0;
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static constexpr u8 FHCRC = 1 << 1;
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static constexpr u8 FEXTRA = 1 << 2;
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static constexpr u8 FNAME = 1 << 3;
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static constexpr u8 FCOMMENT = 1 << 4;
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static constexpr u8 MAX = FTEXT | FHCRC | FEXTRA | FNAME | FCOMMENT;
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};
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class GzipDecompressor final : public Stream {
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public:
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GzipDecompressor(MaybeOwned<Stream>);
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~GzipDecompressor();
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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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static ErrorOr<ByteBuffer> decompress_all(ReadonlyBytes);
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static ErrorOr<void> decompress_file(StringView input_file, NonnullOwnPtr<Stream> output_stream);
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static ErrorOr<Optional<String>> describe_header(ReadonlyBytes);
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static bool is_likely_compressed(ReadonlyBytes bytes);
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private:
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class Member {
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public:
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static ErrorOr<NonnullOwnPtr<Member>> construct(BlockHeader header, LittleEndianInputBitStream&);
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BlockHeader m_header;
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NonnullOwnPtr<DeflateDecompressor> m_stream;
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Crypto::Checksum::CRC32 m_checksum;
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size_t m_nread { 0 };
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private:
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Member(BlockHeader, NonnullOwnPtr<DeflateDecompressor>);
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};
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Member const& current_member() const { return *m_current_member; }
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Member& current_member() { return *m_current_member; }
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NonnullOwnPtr<LittleEndianInputBitStream> m_input_stream;
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u8 m_partial_header[sizeof(BlockHeader)];
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size_t m_partial_header_offset { 0 };
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OwnPtr<Member> m_current_member {};
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bool m_eof { false };
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};
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class GzipCompressor final : public Stream {
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public:
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GzipCompressor(MaybeOwned<Stream>);
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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;
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virtual void close() override;
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static ErrorOr<ByteBuffer> compress_all(ReadonlyBytes bytes);
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static ErrorOr<void> compress_file(StringView input_file, NonnullOwnPtr<Stream> output_stream);
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private:
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MaybeOwned<Stream> m_output_stream;
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};
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}
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