20     private $buffer = '';  variable in GuzzleHttp\\Psr7\\BufferStream
41         $buffer = $this->buffer;
42         $this->buffer = '';
44         return $buffer;
49         $this->buffer = '';
61         return strlen($this->buffer);
91         return strlen($this->buffer) === 0;
104         $currentLength = strlen($this->buffer);
108             $result = $this->buffer;
109             $this->buffer = '';
112             $result = substr($this->buffer, 0, $length);
113             $this->buffer = substr($this->buffer, $length);
124         $this->buffer .= $string;
127         if (strlen($this->buffer) >= $this->hwm) {