main.cpp

/*
 * Copyright 2025 Siddhartha Menon
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <cstdlib>
#include <exception>
#include <fstream>
#include <iostream>
#include <string>

#include "base64.hpp"

int main(int argc, char* argv[]) {
    const char* usage_str = "Usage: ./base64 <filename> ('-' for stdin)";

    if (argc < 2) {
        std::cerr << "Unrecognised invocation.\n\t" << usage_str << "\n";
        return EXIT_FAILURE;
    }

    std::string filename;
    std::string mode;
    if (argc == 2) {
        filename = argv[1];
    } else if (argc == 3) {
        mode = argv[1];

        if (mode != "-d") {
            std::cerr << "Unrecognised option: " << mode << ".\n";
            return EXIT_FAILURE;
        }

        filename = argv[2];
    } else {
        std::cerr << "Unrecognised invocation.\n\t" << usage_str << "\n";
        return EXIT_FAILURE;
    }

    try {
        if (filename != "-") {
            std::ifstream input_file{filename};

            if (!input_file.is_open()) {
                std::cerr << "Failed to open input file: " << filename << ".\n";
                return 0;
            }

            if (mode == "-d") {
                decode(input_file);
            } else {
                encode(input_file);
            }

        } else {
            if (mode == "-d") {
                decode(std::cin);
            } else {
                encode(std::cin);
            }
        }
    } catch (const std::exception& exc) {
        std::cerr << "\nError: " << exc.what() << "\n";
        return EXIT_FAILURE;
    }

    return EXIT_SUCCESS;
}