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Занимательное программирование/5/1_huffman/huffman.hpp

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+#include <string>
+#include <memory>
+#include <vector>
+#include <unordered_map>
+#include <cstdint>
+
+class huffman_tree
+{
+    std::string _value;
+    std::shared_ptr<huffman_tree> _left;
+    std::shared_ptr<huffman_tree> _right;
+
+public:
+    huffman_tree(const std::string& value);
+    huffman_tree(std::shared_ptr<huffman_tree> left, std::shared_ptr<huffman_tree> right);
+
+    std::uint8_t value() const;
+    std::shared_ptr<huffman_tree> left() const;
+    std::shared_ptr<huffman_tree> right() const;
+
+    bool is_leaf() const;
+};
+
+struct huffman_probability
+{
+    std::string bytes;
+    double probability;
+    std::shared_ptr<huffman_tree> tree;
+
+    huffman_probability(const std::string& bytes, double probability);
+
+    huffman_probability operator+(const huffman_probability& that) const;
+    bool operator<(const huffman_probability& that) const;
+    bool operator>(const huffman_probability& that) const;
+    bool operator<=(const huffman_probability& that) const;
+    bool operator>=(const huffman_probability& that) const;
+};
+
+using coding = std::vector<bool>;
+using probability_list = std::vector<huffman_probability>;
+using probability_iterator = probability_list::iterator;
+using probability_const_iterator = probability_list::const_iterator;
+
+class huffman_table
+{
+    std::unordered_map<std::byte, coding> payload;
+
+    void create_table(std::shared_ptr<huffman_tree> tree, coding path);
+
+public:
+    huffman_table(std::shared_ptr<huffman_tree> tree);
+    huffman_table(std::vector<std::uint8_t>::const_iterator& coding_stream);
+    huffman_table() = default;
+
+    void insert(std::uint8_t byte, coding&& path);
+    void encode(std::ostream& output) const;
+    std::size_t size() const;
+    std::unordered_map<std::byte, coding>::iterator begin();
+    std::unordered_map<std::byte, coding>::iterator end();
+    std::unordered_map<std::byte, coding>::const_iterator begin() const;
+    std::unordered_map<std::byte, coding>::const_iterator end() const;
+
+    const coding& operator[](std::uint8_t byte) const;
+};
+
+std::shared_ptr<huffman_tree> create_tree(probability_list& probabilities);
+probability_list adapt_probabilities(const std::vector<std::uint8_t>& input);
+void compress(const std::vector<std::uint8_t>& input, std::ostream& output);
+void decompress(const std::vector<std::uint8_t>& input, std::ostream& output);