BaseLea implementation

baselea.js

// TODO:
// - Add input validation
// - Improve reliability of atob parsing

var TABLE = [
    "Hi.","Hi?","Hi!","Lea.", // 0...4
    "Lea?","Lea!","Bye.","Bye?", // 5...8
    "Bye!","How.","How?","How!", // 9...B
    "Why.","Why?","Why!","..." // C...F
];

function baselea_btoa(input) {
    var output = [];
    for (var i = 0; i < input.length; i++) {
        var charcode = input.charCodeAt(i);
        output.push(TABLE[charcode & 0xF]); // Low nibble
        output.push(TABLE[charcode >> 4]); // High nibble
    }
    return output.join(" ");
}

function baselea_atob(input) {
    var input_split = input.split(" ");
    var output = [];
    for (var i = 0; i < input_split.length; i+=2) {
        var low = TABLE.indexOf(input_split[i]);
        var high = TABLE.indexOf(input_split[i+1]);
        output.push(String.fromCharCode((high << 4) + low));
    }
    return output.join("");
}