23     private $buffer = '';  variable in GuzzleHttp\\Psr7\\BufferStream
44         $buffer = $this->buffer;
45         $this->buffer = '';
47         return $buffer;
52         $this->buffer = '';
64         return strlen($this->buffer);
94         return strlen($this->buffer) === 0;
107         $currentLength = strlen($this->buffer);
111             $result = $this->buffer;
112             $this->buffer = '';
115             $result = substr($this->buffer, 0, $length);
116             $this->buffer = substr($this->buffer, $length);
127         $this->buffer .= $string;
129         if (strlen($this->buffer) >= $this->hwm) {