@qiniu/miku-delivery-mp-ks/dist/utils/murmur3-32/encode-utf8.js

Kuaishou Mini Program SDK for Miku Delivery

export default function encodeUtf8(input) {
    const result = [];
    const size = input.length;
    for (let index = 0; index < size; index++) {
        let point = input.charCodeAt(index);
        if (point >= 0xD800 && point <= 0xDBFF && size > index + 1) {
            const second = input.charCodeAt(index + 1);
            if (second >= 0xDC00 && second <= 0xDFFF) {
                // https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
                point = (point - 0xD800) * 0x400 + second - 0xDC00 + 0x10000;
                index += 1;
            }
        }
        // US-ASCII
        if (point < 0x80) {
            result.push(point);
            continue;
        }
        // 2-byte UTF-8
        if (point < 0x800) {
            result.push((point >> 6) | 192);
            result.push((point & 63) | 128);
            continue;
        }
        // 3-byte UTF-8
        if (point < 0xD800 || (point >= 0xE000 && point < 0x10000)) {
            result.push((point >> 12) | 224);
            result.push(((point >> 6) & 63) | 128);
            result.push((point & 63) | 128);
            continue;
        }
        // 4-byte UTF-8
        if (point >= 0x10000 && point <= 0x10FFFF) {
            result.push((point >> 18) | 240);
            result.push(((point >> 12) & 63) | 128);
            result.push(((point >> 6) & 63) | 128);
            result.push((point & 63) | 128);
            continue;
        }
        // Invalid character
        result.push(0xEF, 0xBF, 0xBD);
    }
    return new Uint8Array(result).buffer;
}