3 files changed, 213 insertions, 0 deletions
diff --git a/aesxx/utils/helpers/bmp.hpp b/aesxx/utils/helpers/bmp.hpp
new file mode 100644
index 0000000..b4b283b
--- /dev/null
+++ b/aesxx/utils/helpers/bmp.hpp
@@ -0,0 +1,57 @@
+// Copyright (c) 2016 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "AES tools" project.
+// For details, see https://github.com/egor-tensin/aes-tools.
+// Distributed under the MIT License.
+
+#include <windows.h>
+
+#include <cstddef>
+#include <cstring>
+
+#include <string>
+#include <utility>
+#include <vector>
+
+namespace bmp
+{
+    class BmpFile
+    {
+    public:
+        BmpFile(std::vector<char>&& buffer)
+            : buffer{std::move(buffer)}
+            , header_size{extract_pixels_offset()}
+        { }
+
+        const void* get_buffer() const { return buffer.data(); }
+
+        std::size_t get_size() const { return buffer.size(); }
+
+        std::size_t get_header_size() const { return header_size; }
+
+        const void* get_pixels() const
+        {
+            return buffer.data() + get_header_size();
+        }
+
+        std::size_t get_pixels_size() const
+        {
+            return get_size() - get_header_size();
+        }
+
+        void replace_pixels(std::vector<unsigned char>&& pixels)
+        {
+            buffer.resize(get_header_size() + pixels.size());
+            std::memcpy(buffer.data() + get_header_size(), pixels.data(), pixels.size());
+        }
+
+    private:
+        std::size_t extract_pixels_offset() const
+        {
+            const auto header = reinterpret_cast<const BITMAPFILEHEADER*>(get_buffer());
+            return header->bfOffBits;
+        }
+
+        std::vector<char> buffer;
+        std::size_t header_size;
+    };
+}
diff --git a/aesxx/utils/helpers/command_line.hpp b/aesxx/utils/helpers/command_line.hpp
new file mode 100644
index 0000000..2e4d803
--- /dev/null
+++ b/aesxx/utils/helpers/command_line.hpp
@@ -0,0 +1,87 @@
+// Copyright (c) 2017 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "AES tools" project.
+// For details, see https://github.com/egor-tensin/aes-tools.
+// Distributed under the MIT License.
+
+#pragma once
+
+#include <boost/filesystem.hpp>
+#include <boost/program_options.hpp>
+
+#include <exception>
+#include <iostream>
+#include <ostream>
+#include <string>
+
+namespace command_line
+{
+    class SettingsParser
+    {
+    public:
+        explicit SettingsParser(const std::string& argv0)
+            : prog_name{extract_filename(argv0)}
+        {
+            visible.add_options()
+                ("help,h",
+                    "show this message and exit");
+        }
+
+        virtual ~SettingsParser() = default;
+
+        virtual const char* get_short_description() const
+        {
+            return "[--option VALUE]...";
+        }
+
+        virtual void parse(int argc, char* argv[])
+        {
+            boost::program_options::options_description all;
+            all.add(hidden).add(visible);
+            boost::program_options::variables_map vm;
+            boost::program_options::store(
+                boost::program_options::command_line_parser{argc, argv}
+                    .options(all)
+                    .positional(positional)
+                    .run(),
+                vm);
+            if (vm.count("help"))
+                exit_with_usage = true;
+            else
+                boost::program_options::notify(vm);
+        }
+
+        bool exit_with_usage = false;
+
+        void usage() const
+        {
+            std::cout << *this;
+        }
+
+        void usage_error(const std::exception& e) const
+        {
+            std::cerr << "usage error: " << e.what() << '\n';
+            std::cerr << *this;
+        }
+
+    protected:
+        boost::program_options::options_description hidden;
+        boost::program_options::options_description visible;
+        boost::program_options::positional_options_description positional;
+
+    private:
+        static std::string extract_filename(const std::string& path)
+        {
+            return boost::filesystem::path{path}.filename().string();
+        }
+
+        const std::string prog_name;
+
+        friend std::ostream& operator<<(std::ostream& os, const SettingsParser& parser)
+        {
+            const auto short_descr = parser.get_short_description();
+            os << "usage: " << parser.prog_name << ' ' << short_descr << '\n';
+            os << parser.visible;
+            return os;
+        }
+    };
+}
diff --git a/aesxx/utils/helpers/file.hpp b/aesxx/utils/helpers/file.hpp
new file mode 100644
index 0000000..48e4c51
--- /dev/null
+++ b/aesxx/utils/helpers/file.hpp
@@ -0,0 +1,69 @@
+// Copyright (c) 2016 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "AES tools" project.
+// For details, see https://github.com/egor-tensin/aes-tools.
+// Distributed under the MIT License.
+
+#include <cstddef>
+
+#include <fstream>
+#include <iterator>
+#include <limits>
+#include <stdexcept>
+#include <string>
+#include <type_traits>
+#include <vector>
+
+namespace file
+{
+    inline std::size_t cast_to_size_t(std::streamoff size)
+    {
+        if (size < 0)
+            throw std::range_error{"file::cast_to_size_t: something went really wrong"};
+        typedef std::make_unsigned<std::streamoff>::type unsigned_streamoff;
+        if (static_cast<unsigned_streamoff>(size) > std::numeric_limits<std::size_t>::max())
+            throw std::range_error{"file::cast_to_size_t: this file is too large"};
+        return static_cast<std::size_t>(size);
+    }
+
+    inline std::size_t get_file_size(const std::string& path)
+    {
+        std::ifstream ifs;
+        ifs.exceptions(std::ifstream::badbit | std::ifstream::failbit);
+        ifs.open(path, std::ifstream::binary | std::ifstream::ate);
+        return cast_to_size_t(ifs.tellg());
+    }
+
+    inline std::vector<char> read_file(const std::string& path)
+    {
+        const auto size = get_file_size(path);
+
+        std::ifstream ifs;
+        ifs.exceptions(std::ifstream::badbit | std::ifstream::failbit);
+        ifs.open(path, std::ifstream::binary);
+
+        std::vector<char> src_buf;
+        src_buf.reserve(size);
+        src_buf.assign(
+            std::istreambuf_iterator<char>{ifs},
+            std::istreambuf_iterator<char>{});
+        return src_buf;
+    }
+
+    inline void write_file(
+        const std::string& path,
+        const void* buffer,
+        const std::size_t size)
+    {
+        std::ofstream ofs;
+        ofs.exceptions(std::ofstream::badbit | std::ofstream::failbit);
+        ofs.open(path, std::ofstream::binary);
+        ofs.write(reinterpret_cast<const char*>(buffer), size);
+    }
+
+    inline void write_file(
+        const std::string& path,
+        const std::vector<unsigned char>& src)
+    {
+        write_file(path, src.data(), src.size());
+    }
+}