Read big file issue with overflow

[se-m]

Node v 4.3.1 This code don`t work

if (overflow !== null) {
  buffer = overflow + buffer;
}

It actually decrease buffer length This is my 2 chunks read log

read 65536 read + overflow 65536 record 93 overflow 86 read 65536 read + overflow 64298

The first record in 2nd chunk was parsed wrong.

---

Buffer.concat do the trick

if (overflow !== null) {
 buffer = Buffer.concat([overflow, buffer]);
}

3 chunk log read 65536 read + overflow 65536 record 93 overflow 86 read 65536 read + overflow 65622 record 93 overflow 57 read 65536 read + overflow 65593