ObjFW
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OFLHADecompressingStream.h
1/*
2 * Copyright (c) 2008-2024 Jonathan Schleifer <js@nil.im>
3 *
4 * All rights reserved.
5 *
6 * This file is part of ObjFW. It may be distributed under the terms of the
7 * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
8 * the packaging of this file.
9 *
10 * Alternatively, it may be distributed under the terms of the GNU General
11 * Public License, either version 2 or 3, which can be found in the file
12 * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
13 * file.
14 */
15
16#import "OFStream.h"
17#import "OFHuffmanTree.h"
18
19OF_ASSUME_NONNULL_BEGIN
20
21#define OFLHADecompressingStreamBufferSize 4096
22
23OF_DIRECT_MEMBERS
24@interface OFLHADecompressingStream: OFStream
25{
26 OFStream *_stream;
27 uint8_t _distanceBits, _dictionaryBits;
28 unsigned char _buffer[OFLHADecompressingStreamBufferSize];
29 uint32_t _bytesConsumed;
30 uint16_t _bufferIndex, _bufferLength;
31 uint8_t _byte;
32 uint8_t _bitIndex, _savedBitsLength;
33 uint16_t _savedBits;
34 unsigned char *_slidingWindow;
35 uint32_t _slidingWindowIndex, _slidingWindowMask;
36 int _state;
37 uint16_t _symbolsLeft;
38 OFHuffmanTree _Nullable _codeLenTree;
39 OFHuffmanTree _Nullable _litLenTree;
40 OFHuffmanTree _Nullable _distTree;
41 OFHuffmanTree _Nullable _treeIter;
42 uint16_t _codesCount, _codesReceived;
43 bool _currentIsExtendedLength, _skip;
44 uint8_t *_Nullable _codesLengths;
45 uint16_t _length;
46 uint32_t _distance;
47}
48
49@property (readonly, nonatomic) uint32_t bytesConsumed;
50
51- (instancetype)of_initWithStream: (OFStream *)stream
52 distanceBits: (uint8_t)distanceBits
53 dictionaryBits: (uint8_t)dictionaryBits;
54@end
55
56OF_ASSUME_NONNULL_END
A base class for different types of streams.
Definition OFStream.h:188