cess point in the <a href="oggpack_buffer.html">oggpack_buffer</a>. 
For write-initialized buffers, this is the number of complete bytes 
written so far. For read-initialized buffers, it is the number of 
complete bytes that have been read so far.
<p>The return value is the number of <b>complete</b> bytes in the buffer.
There may be extra (<8) bits.
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long oggpack_bytes(<a href="oggpack_buffer.html">oggpack_b