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/**
* \file
* \author Egor Tensin <Egor.Tensin@gmail.com>
* \date 2015
* \copyright This file is licensed under the terms of the MIT License.
* See LICENSE.txt for details.
*/
#pragma once
#include "block_input.hpp"
#include "data_parsers.hpp"
#include <aesxx/all.hpp>
#include <boost/filesystem.hpp>
#include <boost/program_options.hpp>
#include <iterator>
#include <deque>
#include <ostream>
#include <string>
#include <utility>
#include <vector>
namespace
{
class CommandLineParser;
class Settings
{
public:
aes::Algorithm get_algorithm() const { return algorithm; }
aes::Mode get_mode() const { return mode; }
bool use_boxes() const { return use_boxes_flag; }
bool verbose() const { return verbose_flag; }
private:
aes::Algorithm algorithm;
aes::Mode mode;
bool use_boxes_flag = false;
bool verbose_flag = false;
friend class CommandLineParser;
};
class CommandLineParser
{
public:
CommandLineParser(const std::string& argv0)
: prog_name(boost::filesystem::path(argv0).filename().string())
, options("Options")
{ }
void parse(Settings& settings, int argc, char** argv, std::vector<Input>& inputs)
{
namespace po = boost::program_options;
options.add_options()
("help,h", "show this message and exit")
("use-boxes,b", po::bool_switch(&settings.use_boxes_flag)->default_value(false), "use the \"boxes\" interface")
("mode,m", po::value<aes::Mode>(&settings.mode)->required(), "set mode of operation")
("algorithm,a", po::value<aes::Algorithm>(&settings.algorithm)->required(), "set algorithm")
("verbose,v", po::bool_switch(&settings.verbose_flag)->default_value(false), "enable verbose output");
std::vector<std::string> args;
po::options_description hidden_options;
hidden_options.add_options()
("positional", po::value<std::vector<std::string>>(&args));
po::options_description all_options;
all_options.add(options).add(hidden_options);
po::positional_options_description positional_options;
positional_options.add("positional", -1);
po::variables_map vm;
po::store(po::command_line_parser(argc, argv)
.options(all_options)
.positional(positional_options)
.run(), vm);
if (vm.count("help"))
{
help_flag = true;
return;
}
po::notify(vm);
parse_inputs(settings, inputs, std::deque<std::string>(
std::make_move_iterator(args.begin()),
std::make_move_iterator(args.end())
));
}
bool exit_with_usage() const { return help_flag; }
private:
static void parse_inputs(
const Settings& settings,
std::vector<Input>& inputs,
std::deque<std::string>&& args)
{
while (!args.empty())
{
auto key_string = std::move(args.front());
args.pop_front();
std::string iv_string;
if (aes::mode_requires_initialization_vector(settings.get_mode()))
{
if (args.empty())
{
throw boost::program_options::error(
"an initialization vector is required for the selected mode of operation");
}
iv_string = std::move(args.front());
args.pop_front();
}
std::vector<std::string> input_block_strings;
while (!args.empty())
{
if (args.front() == "--")
{
args.pop_front();
break;
}
input_block_strings.emplace_back(std::move(args.front()));
args.pop_front();
}
if (aes::mode_requires_initialization_vector(settings.get_mode()))
{
inputs.emplace_back(
std::move(key_string),
std::move(iv_string),
std::move(input_block_strings));
}
else
{
inputs.emplace_back(
std::move(key_string),
std::move(input_block_strings));
}
}
}
const std::string prog_name;
boost::program_options::options_description options;
bool help_flag = false;
friend std::ostream& operator<<(std::ostream&, const CommandLineParser&);
};
std::ostream& operator<<(std::ostream& os, const CommandLineParser& cmd_parser)
{
return os << "Usage: " << cmd_parser.prog_name << " [OPTIONS...] [-- KEY [IV] [BLOCK...]...]\n"
<< cmd_parser.options << "\n";
}
}
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