Add static domain security state generator tool.

net/tools/domain_security_preload_generator/huffman/huffman_node.h

+// Copyright (c) 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef NET_TOOLS_DOMAIN_SECURITY_PRELOAD_GENERATOR_HUFFMAN_HUFFMAN_NODE_H_
+#define NET_TOOLS_DOMAIN_SECURITY_PRELOAD_GENERATOR_HUFFMAN_HUFFMAN_NODE_H_
+
+#include <stdint.h>
+
+#include <memory>
+
+namespace net {
+
+class HuffmanNode {
+ public:
+  HuffmanNode(uint8_t value,
+              int count,
+              std::unique_ptr<HuffmanNode> left,
+              std::unique_ptr<HuffmanNode> right);
+  ~HuffmanNode();
+
+  bool IsLeaf() const;
+
+  uint8_t value() const { return value_; }
+  int count() const { return count_; }
+  const std::unique_ptr<HuffmanNode>& left() const { return left_; }
+  const std::unique_ptr<HuffmanNode>& right() const { return right_; }
+
+ private:
+  uint8_t value_;
+  int count_;
+  std::unique_ptr<HuffmanNode> left_;
+  std::unique_ptr<HuffmanNode> right_;
+};
+
+}  // namespace net
+
+#endif  // NET_TOOLS_DOMAIN_SECURITY_PRELOAD_GENERATOR_HUFFMAN_HUFFMAN_NODE_H_