Function utf8Length

index.js:342–358

Calculates the byte length of a string encoded as UTF8.

(string)

/** Calculates the byte length of a string encoded as UTF8. */
function utf8Length(string) {
  var len = 0,
    c = 0;
  for (var i = 0; i < string.length; ++i) {
    c = string.charCodeAt(i);
    if (c < 128) len += 1;
    else if (c < 2048) len += 2;
    else if (
      (c & 0xfc00) === 0xd800 &&
      (string.charCodeAt(i + 1) & 0xfc00) === 0xdc00
    ) {
      ++i;
      len += 4;
    } else len += 3;
  }
  return len;
}

/** Converts a string to an array of UTF8 bytes. */
function utf8Array(string) {