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Viewing file:     base64-arraybuffer.js (1.77 KB)      -rw-r--r--

// imported from https://github.com/socketio/base64-arraybuffer
const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
// Use a lookup table to find the index.
const lookup = typeof Uint8Array === 'undefined' ? [] : new Uint8Array(256);
for (let i = 0; i < chars.length; i++) {
    lookup[chars.charCodeAt(i)] = i;
}
export const encode = (arraybuffer) => {
    let bytes = new Uint8Array(arraybuffer), i, len = bytes.length, base64 = '';
    for (i = 0; i < len; i += 3) {
        base64 += chars[bytes[i] >> 2];
        base64 += chars[((bytes[i] & 3) << 4) | (bytes[i + 1] >> 4)];
        base64 += chars[((bytes[i + 1] & 15) << 2) | (bytes[i + 2] >> 6)];
        base64 += chars[bytes[i + 2] & 63];
    }
    if (len % 3 === 2) {
        base64 = base64.substring(0, base64.length - 1) + '=';
    }
    else if (len % 3 === 1) {
        base64 = base64.substring(0, base64.length - 2) + '==';
    }
    return base64;
};
export const decode = (base64) => {
    let bufferLength = base64.length * 0.75, len = base64.length, i, p = 0, encoded1, encoded2, encoded3, encoded4;
    if (base64[base64.length - 1] === '=') {
        bufferLength--;
        if (base64[base64.length - 2] === '=') {
            bufferLength--;
        }
    }
    const arraybuffer = new ArrayBuffer(bufferLength), bytes = new Uint8Array(arraybuffer);
    for (i = 0; i < len; i += 4) {
        encoded1 = lookup[base64.charCodeAt(i)];
        encoded2 = lookup[base64.charCodeAt(i + 1)];
        encoded3 = lookup[base64.charCodeAt(i + 2)];
        encoded4 = lookup[base64.charCodeAt(i + 3)];
        bytes[p++] = (encoded1 << 2) | (encoded2 >> 4);
        bytes[p++] = ((encoded2 & 15) << 4) | (encoded3 >> 2);
        bytes[p++] = ((encoded3 & 3) << 6) | (encoded4 & 63);
    }
    return arraybuffer;
};