public function testExceedingHighwaterMarkReturnsFalseButStillBuffers()
{
$buffer = new BufferStream(5);
$this->assertEquals(3, $buffer->write('hi '));
$this->assertFalse($buffer->write('hello'));
$this->assertEquals('hi hello', (string) $buffer);
$this->assertEquals(4, $buffer->write('test'));
}
/**
* @param int $length
*
* @return void|null
*/
private function pump($length)
{
if ($this->source) {
do {
$data = call_user_func($this->source, $length);
if ($data === false || $data === null) {
$this->source = null;
return;
}
$this->buffer->write($data);
$length -= strlen($data);
} while ($length > 0);
}
}