ObjFW
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OFInflate64Stream.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 "OFKernelEventObserver.h"
18
19OF_ASSUME_NONNULL_BEGIN
20
21#define OFInflate64StreamBufferSize 4096
22
32OF_SUBCLASSING_RESTRICTED
34{
35 OFStream *_stream;
36 unsigned char _buffer[OFInflate64StreamBufferSize];
37 uint16_t _bufferIndex, _bufferLength;
38 uint8_t _byte;
39 uint8_t _bitIndex, _savedBitsLength;
40 uint16_t _savedBits;
41 unsigned char *_Nullable _slidingWindow;
42 uint16_t _slidingWindowIndex, _slidingWindowMask;
43 int _state;
44 union {
45 struct {
46 uint8_t position;
47 uint8_t length[4];
48 } uncompressedHeader;
49 struct {
50 uint16_t position, length;
51 } uncompressed;
52 struct {
53 struct _OFHuffmanTree *_Nullable litLenTree;
54 struct _OFHuffmanTree *_Nullable distTree;
55 struct _OFHuffmanTree *_Nullable codeLenTree;
56 struct _OFHuffmanTree *_Nullable treeIter;
57 uint8_t *_Nullable lengths;
58 uint16_t receivedCount;
59 uint8_t value, litLenCodesCount, distCodesCount;
60 uint8_t codeLenCodesCount;
61 } huffmanTree;
62 struct {
63 struct _OFHuffmanTree *_Nullable litLenTree;
64 struct _OFHuffmanTree *_Nullable distTree;
65 struct _OFHuffmanTree *_Nullable treeIter;
66 int state;
67 uint16_t value, length, distance, extraBits;
68 } huffman;
69 } _context;
70 bool _inLastBlock, _atEndOfStream;
71}
72
79@property (retain, nonatomic) OFStream *underlyingStream;
88+ (instancetype)streamWithStream: (OFStream *)stream;
89
90- (instancetype)init OF_UNAVAILABLE;
91
100- (instancetype)initWithStream: (OFStream *)stream OF_DESIGNATED_INITIALIZER;
101@end
102
103OF_ASSUME_NONNULL_END
A class that handles Deflate decompression transparently for an underlying stream.
Definition OFInflate64Stream.h:35
A base class for different types of streams.
Definition OFStream.h:188
This protocol is implemented by classes which can be observed for readiness for reading by OFKernelEv...
Definition OFKernelEventObserver.h:84