eeprom/scripts/eepromv1a.js/bytefmt.js

const EEPFMT = (() => {
    const symbols = ['', 'K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y', 'R', 'Q'];

    const format = (bytes, decimal) => {
        if(bytes === 0)
            return 'Zero Bytes';

        const negative = bytes < 0;
        const power = decimal ? 1000 : 1024;
        const exp = Math.floor(Math.log(bytes) / Math.log(power));

        bytes = Math.abs(bytes);

        const number = bytes / Math.pow(power, exp);
        const symbol = symbols[exp];

        let string = '';
        if(negative)
            string += '-';

        const fractionDigits = bytes < power ? 0 : (number < 10 ? 2 : 1);
        string += number.toLocaleString(undefined, {
            maximumFractionDigits: fractionDigits,
            minimumFractionDigits: fractionDigits,
        });

        string += ` ${symbol}`;

        if(symbol === '') {
            string += 'Byte';
            if(number > 1)
                string += 's';
        } else {
            if(!decimal)
                string += 'i';
            string += 'B';
        }

        return string;
    };

    return {
        format: format,
    };
})();