Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/zxing-cpp/core/src/BitSource.h @ 33:c4daa0c83d64

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author Franz Glasner <fzglas.hg@dom66.de>
date Sun, 21 Sep 2025 17:55:13 +0200
parents b50eed0cc0ef
children
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1 /*
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2 * Copyright 2016 Nu-book Inc.
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3 * Copyright 2016 ZXing authors
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4 */
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5 // SPDX-License-Identifier: Apache-2.0
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7 #pragma once
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9 namespace ZXing {
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11 class ByteArray;
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13 /**
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14 * <p>This provides an easy abstraction to read bits at a time from a sequence of bytes, where the
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15 * number of bits read is not often a multiple of 8.</p>
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16 *
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17 * <p>This class is thread-safe but not reentrant -- unless the caller modifies the bytes array
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18 * it passed in, in which case all bets are off.</p>
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19 *
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20 * @author Sean Owen
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21 */
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22 class BitSource
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23 {
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24 const ByteArray& _bytes;
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25 int _byteOffset = 0;
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26 int _bitOffset = 0;
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28 public:
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29 /**
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30 * @param bytes bytes from which this will read bits. Bits will be read from the first byte first.
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31 * Bits are read within a byte from most-significant to least-significant bit.
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32 * IMPORTANT: Bit source DOES NOT copy data byte, thus make sure that the bytes outlive the bit source object.
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33 */
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34 explicit BitSource(const ByteArray& bytes) : _bytes(bytes) {}
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36 BitSource(BitSource &) = delete;
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37 BitSource& operator=(const BitSource &) = delete;
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39 /**
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40 * @return index of next bit in current byte which would be read by the next call to {@link #readBits(int)}.
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41 */
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42 int bitOffset() const {
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43 return _bitOffset;
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44 }
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46 /**
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47 * @return index of next byte in input byte array which would be read by the next call to {@link #readBits(int)}.
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48 */
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49 int byteOffset() const {
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50 return _byteOffset;
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51 }
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53 /**
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54 * @param numBits number of bits to read
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55 * @return int representing the bits read. The bits will appear as the least-significant bits of the int
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56 */
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57 int readBits(int numBits);
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59 /**
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60 * @param numBits number of bits to peak
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61 * @return int representing the bits peaked. The bits will appear as the least-significant
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62 * bits of the int
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63 */
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64 int peakBits(int numBits) const;
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66 /**
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67 * @return number of bits that can be read successfully
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68 */
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69 int available() const;
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70 };
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72 } // ZXing