https://wiki.swganh.org/index.php?action=history&feed=atom&title=Packet%3APacketFooter 2026-04-07T02:29:40Z Revision history for this page on the wiki MediaWiki 1.26.4 https://wiki.swganh.org/index.php?title=Packet:PacketFooter&diff=1666&oldid=prev 2006-12-09T00:41:07Z

<p></p> <p><b>New page</b></p><div>Packet Footers:<br /> <br /> Every packet in SWG, regardless wether it is just SOE Protocol, just an SWG Packet, or a combination of the both, has a footer.<br /> <br /> <br /> The footer's format is as follows:<br /> <br /> [Compression Flag: 1 byte][CRC value:2 bytes]<br /> total of 3 bytes<br /> [CompFlag][CRC1][CRC2]<br /> <br /> <br /> The checksum algorithm used is a seeded CRC32 checksum of all the data in a packet EXCEPT the crc value located in the footer<br /> (so that includes the compression flag). The CRC is calculated after the compression and then encryption are both applied.<br /> <br /> <br /> The compression used is a default level ZLIB compression applied on the data BETWEEN the SOE opcode(part of the SOE Protocol) and the footer. <br /> So far no record has been made of a compressed packet that is NOT inside the SOE Protocol. If the packet is compressed, the Compression Flag <br /> (CompFlag) is a 1. Uncompressed packets have a Compression Flag (CompFlag) of 0.</div>

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