1d8ab74cbf
We now read the header into a temporary header byte array that is used as the header once its filled up by the input stream, instead of just ending the stream if we are out of bytes mid header.
115 lines
3.6 KiB
C++
115 lines
3.6 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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* Copyright (c) 2021, Idan Horowitz <idan.horowitz@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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 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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const Member& 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();
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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(const 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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