gistfile1.txt

export const decode = (encoded) => {
    const _0 = '\u200c';
    const _1 = '\u200d';

    const chLen = 25;
    const emLen = 25;

    let channelName = '';
    let emoteName = '';

    for (let i = 0; i < chLen; i++) {
        let byte = 0;
        for (let b = 0; b < 8; b++) {
            let bit = encoded[i*8+b];
            if (bit === _1) byte += 2**b;
        }
        channelName += String.fromCharCode(byte);
    }

    for (let i = 0; i < emLen; i++) {
        let byte = 0;
        for (let b = 0; b < 8; b++) {
            let bit = encoded[chLen*8+i*8+b];
            if (bit === _1) byte += 2**b;
        }
        emoteName += String.fromCharCode(byte);
    }

    channelName = channelName.split(String.fromCharCode(0))[0];
    emoteName = emoteName.split(String.fromCharCode(0))[0];
    return { channelName: channelName, emoteName: emoteName };
};

export const encode = ({ channelName, emoteName }) => {
    const _0 = '\u200c';
    const _1 = '\u200d';

    const chLen = 25;
    const emLen = 25;

    let encoded = '';

    let channelNameEncoded = '';
    for (let i = 0; i < channelName.length; i++) {
        let byte = channelName.charCodeAt(i);
        for (let b = 0; b < 8; b++) {
            if (byte >= 2**(7-b)) {
                channelNameEncoded += _1;
                byte -= 2**(7-b);
            } else channelNameEncoded += _0;
        }
        for (let b = 7; b >= 0; b--) encoded += channelNameEncoded.charAt(i*8+b);
    }
    for (let i = 0; i < 25-channelName.length; i++) {
        for (let b = 0; b < 8; b++) encoded += _0;
    }

    let emoteNameEncoded = '';
    for (let i = 0; i < emoteName.length; i++) {
        let byte = emoteName.charCodeAt(i);
        for (let b = 0; b < 8; b++) {
            if (byte >= 2**(7-b)) {
                emoteNameEncoded += _1;
                byte -= 2**(7-b);
            } else emoteNameEncoded += _0;
        }
        for (let b = 7; b >= 0; b--) encoded += emoteNameEncoded.charAt(i*8+b);
    }
    for (let i = 0; i < 25-emoteName.length; i++) {
        for (let b = 0; b < 8; b++) encoded += _0;
    }

    return encoded;
};