React\HttpClient\ChunkedStreamDecoder::iterateBuffer PHP Method

    protected function iterateBuffer()
    {
        if (strlen($this->buffer) <= 1) {
            return false;
        }
        if ($this->nextChunkIsLength) {
            if (substr($this->buffer, 0, 3) === "0\r\n") {
                // We've reached the end of the stream
                $this->reachedEnd = true;
                $this->emit('end');
                $this->close();
                return false;
            }
            $crlfPosition = strpos($this->buffer, static::CRLF);
            if ($crlfPosition === false && strlen($this->buffer) > 1024) {
                $this->emit('error', [new Exception('Chunk length header longer then 1024 bytes')]);
                $this->close();
                return false;
            }
            if ($crlfPosition === false) {
                return false;
                // Chunk header hasn't completely come in yet
            }
            $this->nextChunkIsLength = false;
            $lengthChunk = substr($this->buffer, 0, $crlfPosition);
            if (strpos($lengthChunk, ';') !== false) {
                list($lengthChunk) = explode(';', $lengthChunk, 2);
            }
            if (dechex(hexdec($lengthChunk)) !== $lengthChunk) {
                $this->emit('error', [new Exception('Unable to validate "' . $lengthChunk . '" as chunk length header')]);
                $this->close();
                return false;
            }
            $this->remainingLength = hexdec($lengthChunk);
            $this->buffer = substr($this->buffer, $crlfPosition + 2);
            return true;
        }
        if ($this->remainingLength > 0) {
            $chunkLength = $this->getChunkLength();
            if ($chunkLength === 0) {
                return true;
            }
            $this->emit('data', array(substr($this->buffer, 0, $chunkLength), $this));
            $this->remainingLength -= $chunkLength;
            $this->buffer = substr($this->buffer, $chunkLength);
            return true;
        }
        $this->nextChunkIsLength = true;
        $this->buffer = substr($this->buffer, 2);
        return true;
    }