Gitea Mirror Bot
58 lines
1.7 KiB
C++
58 lines
1.7 KiB
C++
// This file is part of OpenCV project.
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// It is subject to the license terms in the LICENSE file found in the top-level directory
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// of this distribution and at http://opencv.org/license.html.
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//
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// Tencent is pleased to support the open source community by making WeChat QRCode available.
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// Copyright (C) 2020 THL A29 Limited, a Tencent company. All rights reserved.
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//
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// Modified from ZXing. Copyright ZXing authors.
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// Licensed under the Apache License, Version 2.0 (the "License").
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#ifndef __ZXING_COMMON_BITSOURCE_HPP__
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#define __ZXING_COMMON_BITSOURCE_HPP__
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#include "../errorhandler.hpp"
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#include "array.hpp"
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namespace zxing {
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/**
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* <p>This provides an easy abstraction to read bits at a time from a sequence
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* of bytes, where the number of bits read is not often a multiple of 8.</p>
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*
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* <p>This class is not thread-safe.</p>
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*
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* @author srowen@google.com (Sean Owen)
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* @author christian.brunschen@gmail.com (Christian Brunschen)
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*/
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class BitSource : public Counted {
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typedef char byte;
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private:
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ArrayRef<byte> bytes_;
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int byteOffset_;
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int bitOffset_;
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public:
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/**
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* @param bytes bytes from which this will read bits. Bits will be read from
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* the first byte first. Bits are read within a byte from most-significant
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* to least-significant bit.
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*/
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explicit BitSource(ArrayRef<byte> &bytes) : bytes_(bytes), byteOffset_(0), bitOffset_(0) {}
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int getBitOffset() { return bitOffset_; }
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int getByteOffset() { return byteOffset_; }
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int readBits(int numBits, ErrorHandler &err_handler);
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/**
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* @return number of bits that can be read successfully
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*/
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int available();
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};
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} // namespace zxing
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#endif // __ZXING_COMMON_BITSOURCE_HPP__
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