vendor: OpenCV 5.0.0 snapshot at 755e50675d97db9b7d449d8bd6b09888646f6c6e

2026-08-22 00:11:13 +08:00
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+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at http://opencv.org/license.html.
+//
+// Tencent is pleased to support the open source community by making WeChat QRCode available.
+// Copyright (C) 2020 THL A29 Limited, a Tencent company. All rights reserved.
+//
+// Modified from ZXing. Copyright ZXing authors.
+// Licensed under the Apache License, Version 2.0 (the "License").
+
+#ifndef __ZXING_COMMON_BITSOURCE_HPP__
+#define __ZXING_COMMON_BITSOURCE_HPP__
+
+#include "../errorhandler.hpp"
+#include "array.hpp"
+
+namespace zxing {
+/**
+ * <p>This provides an easy abstraction to read bits at a time from a sequence
+ * of bytes, where the number of bits read is not often a multiple of 8.</p>
+ *
+ * <p>This class is not thread-safe.</p>
+ *
+ * @author srowen@google.com (Sean Owen)
+ * @author christian.brunschen@gmail.com (Christian Brunschen)
+ */
+class BitSource : public Counted {
+    typedef char byte;
+
+private:
+    ArrayRef<byte> bytes_;
+    int byteOffset_;
+    int bitOffset_;
+
+public:
+    /**
+     * @param bytes bytes from which this will read bits. Bits will be read from
+     * the first byte first. Bits are read within a byte from most-significant
+     * to least-significant bit.
+     */
+    explicit BitSource(ArrayRef<byte> &bytes) : bytes_(bytes), byteOffset_(0), bitOffset_(0) {}
+
+    int getBitOffset() { return bitOffset_; }
+
+    int getByteOffset() { return byteOffset_; }
+
+    int readBits(int numBits, ErrorHandler &err_handler);
+
+    /**
+     * @return number of bits that can be read successfully
+     */
+    int available();
+};
+
+}  // namespace zxing
+
+#endif  // __ZXING_COMMON_BITSOURCE_HPP__