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97 lines
2.4 KiB
C++
97 lines
2.4 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 <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 InputStream {
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public:
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GzipDecompressor(InputStream&);
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~GzipDecompressor();
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size_t read(Bytes) override;
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bool read_or_error(Bytes) override;
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bool discard_or_error(size_t) override;
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bool unreliable_eof() const override;
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bool handle_any_error() override;
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static Optional<ByteBuffer> decompress_all(ReadonlyBytes);
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static 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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Member(BlockHeader header, InputStream& stream)
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: m_header(header)
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, m_stream(stream)
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{
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}
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BlockHeader m_header;
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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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};
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Member const& current_member() const { return m_current_member.value(); }
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Member& current_member() { return m_current_member.value(); }
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InputStream& 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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Optional<Member> m_current_member;
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bool m_eof { false };
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};
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class GzipCompressor final : public OutputStream {
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public:
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GzipCompressor(OutputStream&);
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~GzipCompressor() = default;
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size_t write(ReadonlyBytes) override;
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bool write_or_error(ReadonlyBytes) override;
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static Optional<ByteBuffer> compress_all(ReadonlyBytes bytes);
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private:
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OutputStream& m_output_stream;
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};
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}
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