added to
the beginning of the output buffer.
</blockquote>


<p><a name='process-input'>[Generic function]</a><br>
<b>process-input</b> <i>compressor</i> <i>input</i> 
<i>start</i> <i>count</i> => |

<blockquote>
Called when <i>count</i> octets of the octet vector <i>input</i>,
starting from <i>start</i>, are about to be compressed. This generic
function should not be called directly, but may be specialized.

<p>This is useful for data formats that must maintain information about
the uncompressed contents o