chore: import upstream snapshot with attribution

zxing-cpp/include/ZXing/ByteArray.h

@@ -0,0 +1,60 @@
+/*
+* Copyright 2016 Nu-book Inc.
+* Copyright 2022 Axel Waggershauser
+*/
+// SPDX-License-Identifier: Apache-2.0
+
+#pragma once
+
+#include "Range.h"
+
+#include <cstdint>
+#include <cstdio>
+#include <string>
+#include <string_view>
+#include <vector>
+
+namespace ZXing {
+
+/**
+	ByteArray is an extension of std::vector<uint8_t>.
+*/
+class ByteArray : public std::vector<uint8_t>
+{
+public:
+	ByteArray() = default;
+	ByteArray(std::initializer_list<uint8_t> list) : std::vector<uint8_t>(list) {}
+	explicit ByteArray(int len) : std::vector<uint8_t>(len, 0) {}
+	explicit ByteArray(const std::string& str) : std::vector<uint8_t>(str.begin(), str.end()) {}
+
+	void append(ByteView other) { insert(end(), other.begin(), other.end()); }
+	void append(std::string_view other) { insert(end(), other.begin(), other.end()); }
+
+	std::string_view asString(size_t pos = 0, size_t len = std::string_view::npos) const
+	{
+		return std::string_view(reinterpret_cast<const char*>(data()), size()).substr(pos, len);
+	}
+
+	ByteView asView(size_t pos = 0, size_t len = size_t(-1)) const
+	{
+		return ByteView(*this).subview(pos, len);
+	}
+};
+
+inline std::string ToHex(ByteView bytes)
+{
+	std::string res(bytes.size() * 3, ' ');
+
+	for (size_t i = 0; i < bytes.size(); ++i)
+	{
+#ifdef _MSC_VER
+		sprintf_s(&res[i * 3], 4, "%02X ", bytes[i]);
+#else
+		snprintf(&res[i * 3], 4, "%02X ", bytes[i]);
+#endif
+	}
+
+	return res.substr(0, res.size()-1);
+}
+
+} // ZXing