This method returns the sum of the number of bytes remaining to be read in the buffer (count - pos
) and the result of calling the {@link java.io.FilterInputStream#in in}.available().
@return an estimate of the number of bytes that can be read (or skippedover) from this input stream without blocking.
@exception IOException if this input stream has been closed byinvoking its {@link #close()} method,or an I/O error occurs.
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