Pushes back a byte by copying it to the front of the pushback buffer.
After this method returns, the next byte to be read will have the value
<code>(byte)b</code>.
@param b the <code>int</code> value whose low-order
byte is to be pushed back.
@exception IOException If there is not enough room inputStream the pushback
buffer for the byte, or this input stream has been closed by
invoking its {@link #close()} method.
Pushes back a byte by copying it to the front of the pushback buffer. After this method returns, the next byte to be read will have the value <code>(byte)b</code>.
@param b the <code>int</code> value whose low-order byte is to be pushed back. @exception IOException If there is not enough room inputStream the pushback buffer for the byte, or this input stream has been closed by invoking its {@link #close()} method.