dw_dev | Thread ids in comment links - where do they come from?

Can anyone tell me/point me to the source code where thread ids in comment links are generated? Especially if all I have is data from export_comments.bml page? For example, when I visit https://www.dreamwidth.org/export_comments.bml?get=comment_body&startid=1 , I can see the following comment:

<comment id="123" jitemid="234" posterid="345" parentid="456">
<body>My Comment</body>
<date>2018-06-08T00:58:54Z</date>
</comment>

But if I go to the actual post page, this comment will be displayed with a link to it. The link looks like this: https://ari-linn.dreamwidth.org/%POSTID%.html?thread=%SOMERANDOMNUMBER%#cmt%SOMERANDOMNUMBER%. Where does %SOMERANDOMNUMBER% come from?

Flat | Top-Level Comments Only

OTTOMH, it's for reasons similar to jitemid/anum in https://dw-dev.dreamwidth.org/205028.html?thread=1595876#cmt1595876. %SOMERANDOMNUMBER% is actually the comment id * 256 + a random number between 0 and 255 (stored with the comment). (If you want to look at the actual code, it should be in $LJHOME/cgi-bin/LJ/Comment.pm.)

Thanks, it was helpful.

Thread ids in comment links - where do they come from?

no subject

no subject