unofficial-oscar-spec/snac_01_21.html

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<title>SNAC(01,21) your extended status from server</title>
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<td><b><font color="white">SNAC(01,21)&nbsp;</font></b></td>
<td width=70% align=right><b><font color="white">SRV_EXT_STATUS&nbsp;</font></b></td>
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This is an own extended status notification. You'll get this when 
you have server-stored icon or if you setup iChat "available" message. It's 
also used to tell the client whether or not it needs to upload an SSI buddy 
icon. Check for buddy icons info <a href="families.html#f0010">here</a>.<br><br>

About icon flags byte. Its purpose is unknown, but i found that bit8=1 is a 
command to upload icon to server and it is appeared after changing corresponding 
ssi item.<br><br>

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 <td width=169>&nbsp;00 01</td>
 <td width=5>&nbsp;</td>
 <td>word</td>
 <td width=5>&nbsp;</td>
 <td width=55%>SNAC family</td>
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 <td>&nbsp;00 21</td>
 <td>&nbsp;</td>
 <td>word</td>
 <td>&nbsp;</td>
 <td>SNAC subtype</td>
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 <td>&nbsp;00 00</td>
 <td>&nbsp;</td>
 <td>word</td>
 <td>&nbsp;</td>
 <td>SNAC flags</td>
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 <td>&nbsp;xx xx xx xx</td>
 <td>&nbsp;</td>
 <td>dword</td>
 <td>&nbsp;</td>
 <td>SNAC request-id</td>
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   <td width=147>&nbsp;00 01</td>
   <td width=5>&nbsp;</td>
   <td>word</td>
   <td width=5>&nbsp;</td>
   <td width=56%>notice type (0x0000 & 0x0001 - <a href="families.html#f0010">SSBI</a> info)</td>
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   <td width=147>&nbsp;xx</td>
   <td width=5>&nbsp;</td>
   <td>byte</td>
   <td width=5>&nbsp;</td>
   <td width=56%>icon flags (bitmask)</td>
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   <td>&nbsp;xx</td>
   <td>&nbsp;</td>
   <td>byte</td>
   <td>&nbsp;</td>
   <td>icon md5 hash length (allways 16)</td>
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   <td>&nbsp;xx ..</td>
   <td>&nbsp;</td>
   <td>array</td>
   <td>&nbsp;</td>
   <td>icon md5 hash array</td>
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   <td width=147>&nbsp;00 02</td>
   <td width=5>&nbsp;</td>
   <td>word</td>
   <td width=5>&nbsp;</td>
   <td width=56%>notice type (0x0002 - iChat "available" message)</td>
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   <td width=147>&nbsp;xx xx</td>
   <td width=5>&nbsp;</td>
   <td>word</td>
   <td width=5>&nbsp;</td>
   <td width=56%>length of message</td>
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   <td>&nbsp;xx ..</td>
   <td>&nbsp;</td>
   <td>string</td>
   <td>&nbsp;</td>
   <td>iChat available message</td>
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<br>Example SNAC dump with flap header:
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<font size=3><pre style="font-size: 13px">

  2A 02 26 0F 00 1E 00 01  00 21 00 00 C8 4C DF CE  *.&..&...!...L..
  00 01 41 10 FC 23 B3 F7  C8 00 D3 92 EF 5E 06 8A  ..A..#.......^..
  D3 66 7F C7                                       .f..

</pre></font>
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