Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/zxing-cpp/core/src/BitSource.cpp @ 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 #include "BitSource.h"
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9 #include "ByteArray.h"
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10 #include "ZXAlgorithms.h"
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12 #include <stdexcept>
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14 namespace ZXing {
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16 int
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17 BitSource::available() const
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18 {
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19 return 8 * (Size(_bytes) - _byteOffset) - _bitOffset;
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20 }
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22 static int ReadBitsImpl(int numBits, const ByteArray& _bytes, int available, int& _byteOffset, int& _bitOffset)
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23 {
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24 if (numBits < 1 || numBits > 32 || numBits > available) {
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25 throw std::out_of_range("BitSource::readBits: out of range");
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26 }
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28 int result = 0;
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30 // First, read remainder from current byte
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31 if (_bitOffset > 0) {
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32 int bitsLeft = 8 - _bitOffset;
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33 int toRead = numBits < bitsLeft ? numBits : bitsLeft;
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34 int bitsToNotRead = bitsLeft - toRead;
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35 int mask = (0xFF >> (8 - toRead)) << bitsToNotRead;
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36 result = (_bytes[_byteOffset] & mask) >> bitsToNotRead;
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37 numBits -= toRead;
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38 _bitOffset += toRead;
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39 if (_bitOffset == 8) {
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40 _bitOffset = 0;
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41 _byteOffset++;
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42 }
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43 }
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45 // Next read whole bytes
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46 if (numBits > 0) {
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47 while (numBits >= 8) {
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48 result = (result << 8) | _bytes[_byteOffset];
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49 _byteOffset++;
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50 numBits -= 8;
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51 }
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53 // Finally read a partial byte
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54 if (numBits > 0) {
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55 int bitsToNotRead = 8 - numBits;
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56 int mask = (0xFF >> bitsToNotRead) << bitsToNotRead;
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57 result = (result << numBits) | ((_bytes[_byteOffset] & mask) >> bitsToNotRead);
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58 _bitOffset += numBits;
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59 }
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60 }
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62 return result;
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63 }
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65 int BitSource::readBits(int numBits)
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66 {
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67 return ReadBitsImpl(numBits, _bytes, available(), _byteOffset, _bitOffset);
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68 }
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70 int BitSource::peakBits(int numBits) const
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71 {
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72 int bitOffset = _bitOffset;
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73 int byteOffset = _byteOffset;
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74 return ReadBitsImpl(numBits, _bytes, available(), byteOffset, bitOffset);
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75 }
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77 } // ZXing