_disk_fclose</code> function releases any zlib decoder info needed for decompression
  and dumps the ZZIP_DISK_FILE* then.
</p>
</td></tr><tr><td valign="top"><p>
  The <code>zzip_disk_feof</code> function allows to distinguish an error from an eof condition.
  Actually, if we found an error but we did already reach eof then we
  just keep on saying that it was an eof, so the app can just continue.
</p>
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