FLCF

--[[
    FLCF - Fast Lightweight Compressed Files
    An creation of Redall.

    Under MIT License:
    Copyright (c) 2017 Alexis B.

    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in all
    copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    SOFTWARE.
]]--

local object = {};

function createArchive(path)
    if (fs.exists(path)) then
        error("Archive already exists.");
        return;
    elseif (fs.isDir(path)) then
        error("Given path is a directory.");
        return;
    end

    local structure = {
        type = "flcf",
        content = {},
    };

    local archive = fs.open(path, "w");
    archive.write(textutils.serialise(structure));
    archive.close();
end

function loadArchive(path)
    if (fs.exists(path) == false) then
        error("Archive does not exists.");
        return;
    elseif (fs.isDir(path)) then
        error("Given path is a directory.");
        return;
    end

    local archive = fs.open(path, "r");
    local files = textutils.unserialise(archive.readAll());
    archive.close();

    local usableArchive = object;
    usableArchive.archive = files;
    usableArchive.path = path;

    return usableArchive;
end

function object.addFile(source, dest)
    if (fs.exists(source) == false) then
        error("Source file does not exists.");
        return;
    elseif (fs.isDir(source)) then
        error("Expected file, folder given.");
        return;
    end

    local file = fs.open(source, "r");
    local content = file.readAll();
    file.close();

    local entry = {
        path = dest,
        content = content,
    }

    table.insert(object.archive.content, entry);
end

function object.removeFile(path)
    for id, entry in ipairs(object.archive.content) do
        if (entry.path == path) then
            table.remove(object.archive.content, id);
            return;
        end
    end
end

function object.extractFile(source, dest)
    for _, entry in ipairs(object.archive.content) do
        if (entry.path == path) then
            local f = fs.open(dest, "w");
            f.write(entry.content);
            f.close();

            return;
        end
    end
end

function object.saveArchive()
    local archive = fs.open(object.path, "w");
    archive.write(textutils.serialise(object.archive));
    archive.close();
end

function object.getFiles()
    return object.archive.content;
end

function object.getType()
    return object.archive.type;
end