pure JS alternative for validation.cc ?

[seriousme]

Hi,

just out of curiosity: would it be possible to replace validation.cc by:

module.exports.Validation = {
  isValidUTF8: function(buf) {
    return buf.compare(Buffer.from(buff.toString())) === 0;
  }
};

or if that takes to many cycles:

function utf8CheckByte(byte) {
  if (byte <= 0x7f) return 0;
  else if (byte >> 5 === 0x06) return 2;
  else if (byte >> 4 === 0x0e) return 3;
  else if (byte >> 3 === 0x1e) return 4;
  return byte >> 6 === 0x02 ? -1 : -2;
}

module.exports.Validation = {
  isValidUTF8: function(buf) {
    let i = 0;
    while (i < buf.length) {
      let nb = utf8CheckByte(buf[i++]);
      if (nb < 0 || i + nb > buf.length) return false;
      if (nb > 0) {
        for (let j = 1; j < nb; j++) {
          let cb = utf8CheckByte(buf[i++]);
          if (cb != -1) return false;
        }
      }
    }
    return true;
  }
};

Where the utf8CheckByte() function is borrowed from nodejs string_decoder.js

Kind regards, Hans