/h4></a>

<p>Checksums are used in several data formats to check data
  integrity. For example, PNG uses a CRC32 checksum for its chunks of
  data. Salza2 exports support for two common checksums.

<p><a name='adler32-checksum'><a name='crc32-checksum'>[Standard classes]</a></a><br>
<b>adler32-checksum</b><br>
<b>crc32-checksum</b>

<blockquote>
Instances of these classes may be created directly with
make-instance.
</blockquote>

<p><a name='update'>[Generic function]</a><br>
<b>update</b> <i>checksum</i> <