media strings and pinfo->private_data

[mmann78 () netscape net]

I'm looking into removing the use of pinfo->private_data in all current dissectors in favor of only using the "data" 
parameter in new-style dissectors.  The last large remaining use of pinfo->private_data is to pass "string media" 
between various dissectors.  Some of the "receiving" dissectors (of the string data) support receiving strings through 
1 or more of the following methods:
1. data parameter of new-style dissector
2. pinfo->match_string
3. pinfo->private_data

Can someone give me the "10000 ft view" of this behavior?  Should I be able to "convert" all pinfo->private_data use 
into data parameters?  Do the strings end up going through multiple dissectors, so it needs to be "protected" in 
pinfo->private_data?  Are there inherent relationships between a "pinfo->match_string" string and either the data 
parameter or pinfo->private_data string?

This is stuff I haven't been able to figure out with just code analysis.

___________________________________________________________________________
Sent via:    Wireshark-dev mailing list <wireshark-dev () wireshark org>
Archives:    http://www.wireshark.org/lists/wireshark-dev
Unsubscribe: https://wireshark.org/mailman/options/wireshark-dev
             mailto:wireshark-dev-request () wireshark org?subject=unsubscribe