Donna Dionne wrote:
HI John,
Sorry to bother you with questions. I am new to second life protocol
and noticed that you are an expert on this topic. I have a really
basic question.
How do I figure out the packet type for a packet that is not
zero-encoded. I.e., the bytes 5, 6, or 7 and 8 for high, medium, or
low packets respectively.
I have seen message_template.txt and keywords.txt files, but still
can't figure out the packet type.
For example, the packet 40 00 00 01 ff ff 00 03 is a low packet of
type 00 03, but what is the definition of low packet type 00 03 in
message_template.txt? In general, how do I know what each definition
in message_template.txt corresponds to in terms of packet types (byte
5, 6 or 7 and 8)? does the file keyword.txt help?
Thanks so much for your time and help!
Best regards,
Donna
You are going to have to parse the entire message_template and keywords
files ahead of time to know what packet id is what packet. You can look
at the code in ProtocolManager.cs in libsecondlife to see how we do it,
basically parse through the message_template and the first low packet
you encounter goes in to a LowPackets[] array at position 1. the second
low packet goes at position 2, third at 3, etc. The first medium packet
goes in to an array MediumPackets[] at position 1, you are getting the
picture. Now when you're building the layout for the packets, block and
field ordering is important but it's also not stored in the
message_template. All of the packets are in order but all of the fields
and blocks are out of order; strange eh? So the keywords.txt file is an
ordered list of all the keywords (names of either blocks or fields), so
when you are building the packet template you need to sort the blocks
and fields using the order in keywords.txt. It's fairly non-trivial,
which makes me wonder if you might be able to take advantage of existing
code that does this instead? libsecondlife is modular enough that you
can use portions of it without having to use it to login.
John Hurliman
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