blob: ef7f67767e52bd5ab8e2988ae6112b960d9d725a (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
|
/*
* Copyright (c) 2020-2022, the SerenityOS developers.
* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/NonnullOwnPtr.h>
#include <AK/OwnPtr.h>
#include <AK/Stream.h>
#include <LibCompress/Deflate.h>
#include <LibCrypto/Checksum/CRC32.h>
namespace Compress {
constexpr u8 gzip_magic_1 = 0x1f;
constexpr u8 gzip_magic_2 = 0x8b;
struct [[gnu::packed]] BlockHeader {
u8 identification_1;
u8 identification_2;
u8 compression_method;
u8 flags;
LittleEndian<u32> modification_time;
u8 extra_flags;
u8 operating_system;
bool valid_magic_number() const;
bool supported_by_implementation() const;
};
struct Flags {
static constexpr u8 FTEXT = 1 << 0;
static constexpr u8 FHCRC = 1 << 1;
static constexpr u8 FEXTRA = 1 << 2;
static constexpr u8 FNAME = 1 << 3;
static constexpr u8 FCOMMENT = 1 << 4;
static constexpr u8 MAX = FTEXT | FHCRC | FEXTRA | FNAME | FCOMMENT;
};
class GzipDecompressor final : public Stream {
public:
GzipDecompressor(NonnullOwnPtr<Stream>);
~GzipDecompressor();
virtual ErrorOr<Bytes> read_some(Bytes) override;
virtual ErrorOr<size_t> write_some(ReadonlyBytes) override;
virtual bool is_eof() const override;
virtual bool is_open() const override { return true; }
virtual void close() override {};
static ErrorOr<ByteBuffer> decompress_all(ReadonlyBytes);
static ErrorOr<void> decompress_file(StringView input_file, NonnullOwnPtr<Stream> output_stream);
static Optional<DeprecatedString> describe_header(ReadonlyBytes);
static bool is_likely_compressed(ReadonlyBytes bytes);
private:
class Member {
public:
static ErrorOr<NonnullOwnPtr<Member>> construct(BlockHeader header, LittleEndianInputBitStream&);
BlockHeader m_header;
NonnullOwnPtr<DeflateDecompressor> m_stream;
Crypto::Checksum::CRC32 m_checksum;
size_t m_nread { 0 };
private:
Member(BlockHeader, NonnullOwnPtr<DeflateDecompressor>);
};
Member const& current_member() const { return *m_current_member; }
Member& current_member() { return *m_current_member; }
NonnullOwnPtr<LittleEndianInputBitStream> m_input_stream;
u8 m_partial_header[sizeof(BlockHeader)];
size_t m_partial_header_offset { 0 };
OwnPtr<Member> m_current_member {};
bool m_eof { false };
};
class GzipCompressor final : public Stream {
public:
GzipCompressor(MaybeOwned<Stream>);
virtual ErrorOr<Bytes> read_some(Bytes) override;
virtual ErrorOr<size_t> write_some(ReadonlyBytes) override;
virtual bool is_eof() const override;
virtual bool is_open() const override;
virtual void close() override;
static ErrorOr<ByteBuffer> compress_all(ReadonlyBytes bytes);
static ErrorOr<void> compress_file(StringView input_file, NonnullOwnPtr<Stream> output_stream);
private:
MaybeOwned<Stream> m_output_stream;
};
}
|
