Function pad

backup/sysxc.js:376–379

(text)

const BLOCK_SIZE = 16;

function pad(text) {
    const padding = BLOCK_SIZE - text.length % BLOCK_SIZE;
    return text + String.fromCharCode(padding).repeat(padding);
}

function unpad(text) {
    const padding = text.charCodeAt(text.length - 1);