available
Returns an estimate of the number of bytes that can be read (or skipped over) from this input stream without blocking by the next invocation of a method for this input stream.
Return
an estimate of the number of bytes that can be read (or skipped over) f rom this input stream without blocking or 0 when it reaches the end of the input stream.
Since
0.1.1
Throws
if an I/O error occurs.
if this method is not supported.