Function getLens

docs/app/js/sanddance-app.js:114099–114111

(b64)

revLookup["-".charCodeAt(0)] = 62;
revLookup["_".charCodeAt(0)] = 63;
function getLens(b64) {
    var len1 = b64.length;
    if (len1 % 4 > 0) throw new Error("Invalid string. Length must be a multiple of 4");
    // Trim off extra bytes after placeholder bytes are found
    // See: https://github.com/beatgammit/base64-js/issues/42
    var validLen = b64.indexOf("=");
    if (validLen === -1) validLen = len1;
    var placeHoldersLen = validLen === len1 ? 0 : 4 - validLen % 4;
    return [
        validLen,
        placeHoldersLen
    ];
}
// base64 is 4/3 + up to two characters of the original data
function byteLength(b64) {
    var lens = getLens(b64);