https://wiki.swganh.org/index.php?action=history&feed=atom&title=Packet%3ACompression 2026-04-07T02:14:52Z Revision history for this page on the wiki MediaWiki 1.26.4 https://wiki.swganh.org/index.php?title=Packet:Compression&diff=1669&oldid=prev 2006-12-09T00:42:28Z

<p></p> <p><b>New page</b></p><div>The compression algorithm used on SWG packets is a standard ZLIB algorithm.<br /> <br /> Please refer to ZLIB documentation on how the algorithm functions, for the sake of simplicity, we use the <br /> ZLIB's Compress/Decompress functions on the data at a standard level of compression.<br /> <br /> The data that is compressed is between the SOE Opcode and the footer. So far no stand-alone SWG Packets have <br /> been recorded that are compressed.<br /> <br /> If data is compressed, the first byte of the footer (which is a compression byteflag) is 1. If it is not compressed, it is a 0.<br /> <br /> Compression will occur BEFORE encryption, and BEFORE a CRC value is appended.<br /> <br /> Compression is applied on all network status updates (both client and server), and on packets that are generally &gt; 100 bytes.<br /> The largest any packet can be uncompressed is 496 bytes, which includes the footer. If it is larger it must be fragmented first.</div>

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