$buffer :
$length :
$pos :
$mark :
__construct( $string = '')
close()
length()
getc()
read( $n)
readfull()
readuntil( $tag)
readString( $n)
mark()
unmark()
reset()
skip( $n)
eof()
write( $str, $n = -1)
load( $filename)
save( $filename)
toString()
__toString()