Добавлена первая задача пятой главы

Занимательное программирование/5/1_huffman/main.cpp

@@ -0,0 +1,69 @@
+#include <cstring>
+#include <fstream>
+#include <vector>
+#include <cstdint>
+#include <iostream>
+#include "huffman.hpp"
+
+std::vector<std::uint8_t> read_file(char *filename)
+{
+    std::ifstream input_file{ filename, std::ios::binary | std::ios::in };
+    input_file.exceptions(std::ios::badbit | std::ios::failbit);
+
+    return std::vector<std::uint8_t>{ std::istreambuf_iterator<char>(input_file), {} };
+}
+
+enum class direction {
+    compress,
+    decompress
+};
+
+int show_usage()
+{
+    std::cerr << "Usage: huffman (compress|decompress) input_file output_file." << std::endl;
+    return 1;
+}
+
+int main(int argc, char **argv)
+{
+    direction operation;
+    if (argc != 4)
+    {
+        return show_usage();
+    }
+    if (std::strcmp(argv[1], "compress") == 0)
+    {
+        operation = direction::compress;
+    }
+    else if (std::strcmp(argv[1], "decompress") == 0)
+    {
+        operation = direction::decompress;
+    }
+    else
+    {
+        return show_usage();
+    }
+    std::vector<std::uint8_t> input;
+    try
+    {
+        input = read_file(argv[2]);
+    }
+    catch (std::iostream::failure& exception)
+    {
+        std::cerr << "Error opening file \"" << argv[2] << "\" for reading." << std::endl;
+        return 2;
+    }
+    std::ofstream output_file{ argv[3], std::ios::binary | std::ios::out | std::ios::trunc };
+    output_file.exceptions(std::ios::badbit | std::ios::failbit);
+
+    switch (operation)
+    {
+    case direction::compress:
+        compress(input, output_file);
+        break;
+    case direction::decompress:
+        decompress(input, output_file);
+        break;
+    }
+    return 0;
+}