On May 11, 2013, at 7:28 AM, Ambarisha B <b.ambari...@gmail.com> wrote:

> I was trying to move the reassembled data from the reassembled_table to 
> frame_data.

Moving stuff to frame_data is something that should only be done as a last 
resort if it's being done as part of a project to reduce memory usage. :-)

*Every packet in a capture* has a frame_data structure and, at least in one 
test, the memory for frame_data structures was a significant contributor to 
Wireshark's memory usage; overall, we want to make that structure *smaller*, 
not *bigger.

> The key to the reassembled_table is (framenum, ID). I am not able to figure 
> out what ID is for. In a capture file, frame number itself would be unique, 
> wouldn't it?

There can be more than one higher-level packet inside a frame (just as a 
higher-level packet can require more than one lower-level frame), so, no, the 
frame number is not necessarily unique.
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