[Tabs set to 4]

Code	=	Numeric key used to describe this field
Purpose	=	Content of the data.  If unknown, examples are shown in quotes.
Used	=	Service ID's (hex) of packets which feature this field, with 
			postfix '<' for incoming packets and '>' for outgoing.

Flags use "1" for true and "0" for false.

(?) indicates an educated guess (ie: something which seems logical, but
has not actually been proved!)


------------------------------------------------------------------------------
Code 	Purpose											Used
------------------------------------------------------------------------------
0		yahoo id										01<,06>,54>
1		yahoo id (effective id?)						01<,06>,0f<,18<,54>,57>,83>,84>,86>
2		<unknown> "1"									54>
3		yahoo id (request maker?)						0f<,55<
4		from (yahoo id)									06<,46<,4b<
5		to (yahoo id)									06<,06>,46<,4b<
6		authentification md5 response					54>
7		friend (target when managing friends)			01<,03<,04<,83>,84>,86>
8		number of online friends (repeat count)			01<
9		number of mail messages							0b<
10		online status									01<,03<,04<
11		<unknown> "0", "7A200000", "C12DA9F9"			01<,03<,04<
13		misc boolean flag 								01<,03<,04<,18<,1c>,4b<,57<
14		message text									06<,06>,46<,4b<,86>
15		Unix timestamp									06<,0f<
16		error message									07<,4b<
17		online friend in chat? (flag)					01<,03<,04<
18		email subject field								0b<
19		custom status message							01<(?),03<,04<
20		URL of file on yahoo							46<
:
27		filename										46>
28		file size										46>
29		file transfer - end of packet marker?			46>
:
31		<unknown> "6"									06<
32		<unknown> "6"									06<
:
38		Unix timestamp (expires?)						46<
:
42		email from field								0b<
43		email body text									0b<
:
47		custom status flag ("0"=away,"1"=back)			01<(?),03<,04<
:
49		string literal "TYPING"							4b<
50		conference ownder (yahoo id)					18<
:
52		<unknown> yahoo id, (list of users in conf.?)	18<
53		conference yahoo id, login						?<
54		conference yahoo id, decline					?<
55		conference yahoo id, available (status==2)		?<
56		conference yhaoo id, logoff						?<
57		conference room name							18<
58		conference invite message						18<
59		HTTP cookie										55<
60		<unknown> only appears occasionally				02<
:
63		imvironment name or ";0"						06<,06>
64		<unknown> "0"									06<,06>
65		group name (target when managing friends)		13>,83>,84>
66		friend status									85<
67		replacement group name							13>
:
87		friends/folders list							55<
88		ignored friends list							55<
89		identities list									55<
90		<unknown> "1" (yahoo mail?)						55<
:
93		<unknown> "86400"								55<
94		authentification salt code (24 chars)			57<
:
96		authentification md5crypt response				54>
97		utf8 encode true/false = "0" or "1"				06<,06>
:
100		<unknown> "0"									55<
101		<unknown> ""									55<
102		<unknown> ""									55<
:
149		<unknown> base64 style encoded binary			55<
150		<unknown> base64 style encoded binary			55<
151		<unknown> base64 style encoded binary			55<
:
153		<unknown> "9" (perhaps protocol version?)		55<


------------------------------------------------------------------------------
Output
------------------------------------------------------------------------------

0x02	LOGOFF
	<none>
	
0x03	ISAWAY	
	10 : new status

	[optional extension if custom status]
	19 : custom status message text
	47 : custom status flag, away/back

0x04	ISBACK
	10 : new status (usually AVAILABLE)
	
0x06	MESSAGE
	0 : yahoo id
	1 : yahoo id (effective id?)
	5 : to (yahoo id)
	14 : message text

	[optional extension]
	63 : imvironment name or ";0"
	64 : <unknown> "0"
	97 : utf8 encode true/false
	
0x12	PING
	<none>

0x54	AUTHRESP
	0 : yahoo id
	6 : authentification md5 response
	96 : authentification md5crypt response
	2 : <unknown> "1"
	1 : yahoo id (effective id?)

0x57	AUTH
	1 : yahoo id
	
0x83	ADDBUDDY
	1 : yahoo id
	7 : friend (target when managing friends)
	65 : group (target when managing friends)
	

0x84	REMBUDDY
	1 : yahoo id
	7 : friend (target when managing friends)
	65 : group (target when managing friends)

0x86	REJECTCONTACT
	1 : yahoo id
	7 : friend (target when managing friends)
	14 : message text

typing
	5 : to (yahoo id)
	4 : from (yahoo id)
	14 : message text, always " "
	13 : typing on/off = 1/0
	49 : string iteral, always "TYPING"
	
filetransfer
	0 : yahoo id
	5 : to (yahoo id)
	14 : message text
	27 : name
	28 ; size
	
grouprename
	1 : yahoo id
	65 : old group name
	67 : new group name
	
CONFADDINVITE
	1 : yahoo id
	51 : to (yahoo id)
	57 : room
	58 : invite message text
	13 : <unknown> flag "0"
	
0x96	CHATINTRO
	109 : yahoo id
	1 : yahoo id
	6 : <unknown> string literal "abcde"

0x98	CHATLOGON
	1 : yahoo id
	104 : room name
	129 : room code
	62 : <unknown> "2"
	



------------------------------------------------------------------------------
Input
------------------------------------------------------------------------------

0x01	LOGON
	0 : yahoo id
	1 : yahoo id (effective id?) [may be missing]

	[optional extension]
	8 : number of online friends (repeat count)  [may be missing]
	7 : friend (yahoo id)		 		  --+
	10 : online friend state 				|
	11 : <unknown> "0" "7A20000				| Repeats (see "8" above)
	17 : online friend in chat flag?		|
	13 : online friend in pager flag?	  --+

	Note: keys 19 and 47 may also appear in some friends data (see ISAWAY/
	ISBACK) although this has yet to be obversed in the wild!)	

0x02	LOGOFF
	<none>

0x03	ISAWAY
Format 1 : when applied to us (error?)
	<none>
Format 2 : when applied to a friend
	7 : friend (yahoo  id)
	10 : online friend state
	19 : [optional] custom status message
	47 : [optional] custom status flag ("0"=away,"1"=back)	
	11 : <unknown> "7A200000"
	17 : online friend in chat flag?
	13 : online friend in pager flag?

0x04	ISBACK
Format 1 : when applied to us (error?)
	<none>
Format 2 : when applied to a friend
	7 : friend (yahoo  id)
	10 : online friend state
	19 : [optional] custom status message
	47 : [optional] custom status flag ("0"=away,"1"=back)	
	11 : <unknown> "7A200000"
	17 : online friend in chat flag?
	13 : online friend in pager flag?
	
0x06	MESSAGE
Format 1 : (status = 0x00000001) Online message
	5 : to (yahoo id)
	4 : from (yahoo id)
	14 : message text

	[optional extension]
	63 : imvironment name or ";0"
	64 : <unknown> "0"
	97 : utf8 encode true/false
	
Format 2 : (status = 0x00000005) Offline message(s)
	31 : <unknown> "6"	  --+
	32 : <unknown> "6"		|
	5 : to (yahoo id)		|
	4 : from (yahoo id)		|  Repeat for each message
	15 : Unix timestamp		|
	14 : message text		|
	97 : <unknown> "1"	  --+

	Also MESSAGE GAMEMSG SYSMESSAGE
	<1or4=from,97=utf8_user_or_sys_message,14or16=message,
	
0x0b	NEWMAIL
	9 : number of new mails

	[optional extension]
	43 : email from field
	42 : email body text
	18 : email subject field

0x0f	NEWCONTACT
Format 1 : (after adding/removing a friend when the operation isn't redundant)
	<none>	
Format 2 : (when another user adds you to their list)
	1 : yahoo id (effective id?)
	3 : yahoo id (request maker)
	14 : message text
	[optional extension: if you were offline when the request was sent]
	15 : Unix timestamp

	<10=state,13=online,47=away>

0x18	CONFINVITE
	1 : yahoo id (effective id?)
	57 : conference room name
	50 : conference owner (yahoo id)
	52 : <unknown> yahoo id, (list of users in conf.?)
	58 : conference invite message
	13 : <unknown> flag "0"

0x46	FILETRANSFER
	5 : to (yahoo id)
	4 : from (yahoo id)
	20 : URL of file on yahoo
	38 : Unix timestamp (expires?)
	14 : message text

	Also FILETRANSFER P2PFILEXFER
	<27=filename,28=filesize,49=service>

0x4b	NOTIFY
	5 : to (yahoo id)
	4 : from (yahoo id)
	14 : message text
	13 : state "1=on"
	16 : <unknown>
	49 : notification type "TYPING"
	
0x57	AUTH
	1 : yahoo id
	94 : authentification salt code (24 chars)
	13 : <unknown> "0"

0x55	LIST
	87 : friends/folders list
	88 : ignored friends list
	89 : identities list
	59 : HTTP cookie Y
	59 : HTTP cookie T
	59 : HTTP cookie C
	153 : <unknown> "9" (perhaps protocol version?)
	90 : <unknown> "1" (yahoo mail?)
	3 : yahoo id
	100 : <unknown> "0"
	101 : <unknown> ""
	102 : <unknown> ""
	93 : <unknown> "86400"
	149 : <unknown> base64 style encoded binary
	150 : <unknown> base64 style encoded binary
	151 : <unknown> base64 style encoded binary
	
Also CONFINVITE CONFADDINVITE CONFDECLINE CONFLOGON CONFLOGOFF CONFMSG
process_conference
	<50=host,52=members_list,53=who(logon),54=who(decline),55=who
	(unavailable status==2),56=who(logoff),57=room,58=join_message,
	14=decline_mesg,16=error_mesg,1=id,3=sender,97=utf8
	
process_contact
	<1=id,3=who,14=mesg,7=name,10=state,15=tm,13=online,47=away>
	
process_addbuddy
	<1=me,7=who,65=where,66=status>

process_buddydel
	<1=me,7=who,65=where,66=unk_66>

process_ignore
	<0=who,1=me,13=1/0...ignore/unignore,66=status>
	status	0 ok
			2 already in ignore list, could not add
			3 not in ignore list, could not delete
			12 is a buddy, could not add
			
process_voicechat
	<4=who,5=me,13=voice_room,57=room>