19     private $buffer = '';  variable in GuzzleHttp\\Stream\\BufferStream
40         $buffer = $this->buffer;
41         $this->buffer = '';
43         return $buffer;
48         $this->buffer = '';
63         return strlen($this->buffer);
88         return strlen($this->buffer) === 0;
101         $currentLength = strlen($this->buffer);
105             $result = $this->buffer;
106             $this->buffer = '';
109             $result = substr($this->buffer, 0, $length);
110             $this->buffer = substr($this->buffer, $length);
121         $this->buffer .= $string;
123         if (strlen($this->buffer) >= $this->hwm) {