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comparison mupdf-source/thirdparty/zxing-cpp/core/src/BitSource.h @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /*
2 * Copyright 2016 Nu-book Inc.
3 * Copyright 2016 ZXing authors
4 */
5 // SPDX-License-Identifier: Apache-2.0
6
7 #pragma once
8
9 namespace ZXing {
10
11 class ByteArray;
12
13 /**
14 * <p>This provides an easy abstraction to read bits at a time from a sequence of bytes, where the
15 * number of bits read is not often a multiple of 8.</p>
16 *
17 * <p>This class is thread-safe but not reentrant -- unless the caller modifies the bytes array
18 * it passed in, in which case all bets are off.</p>
19 *
20 * @author Sean Owen
21 */
22 class BitSource
23 {
24 const ByteArray& _bytes;
25 int _byteOffset = 0;
26 int _bitOffset = 0;
27
28 public:
29 /**
30 * @param bytes bytes from which this will read bits. Bits will be read from the first byte first.
31 * Bits are read within a byte from most-significant to least-significant bit.
32 * IMPORTANT: Bit source DOES NOT copy data byte, thus make sure that the bytes outlive the bit source object.
33 */
34 explicit BitSource(const ByteArray& bytes) : _bytes(bytes) {}
35
36 BitSource(BitSource &) = delete;
37 BitSource& operator=(const BitSource &) = delete;
38
39 /**
40 * @return index of next bit in current byte which would be read by the next call to {@link #readBits(int)}.
41 */
42 int bitOffset() const {
43 return _bitOffset;
44 }
45
46 /**
47 * @return index of next byte in input byte array which would be read by the next call to {@link #readBits(int)}.
48 */
49 int byteOffset() const {
50 return _byteOffset;
51 }
52
53 /**
54 * @param numBits number of bits to read
55 * @return int representing the bits read. The bits will appear as the least-significant bits of the int
56 */
57 int readBits(int numBits);
58
59 /**
60 * @param numBits number of bits to peak
61 * @return int representing the bits peaked. The bits will appear as the least-significant
62 * bits of the int
63 */
64 int peakBits(int numBits) const;
65
66 /**
67 * @return number of bits that can be read successfully
68 */
69 int available() const;
70 };
71
72 } // ZXing