Issue with tvbuff_t

[Varun Gupta <varun.gupta () aricent com>]

Hi All,

I am writing a new dissector (similar to SDP, occurs as payload in SIP message), where I get a tvbuff_t* in my proto 
dissect function from the wireshark. Now somehow my requirement is such that I need to take all the content part from 
this tvbuff_t* using tvb_get_ptr(). And then perform some decoding on this payload and form a new tvbuff_t* object 
using tvb_new_real_data() function. And use this new tvbuff_t* object in all my proto_tree_add_text() function calls. 
So in a nutshell I am not using the same tvbuff_t* that I got in dissect_proto() function from wireshark in protocol 
tree creation functions. Now I have two questions:

1. While creating a new tvbuff_t* I do not know what kind of tvb_type I am using so that I could create a new tvbuff_t* 
of same type (SUBSET, REALDATA, COMPOSITE). How can I find that?
2. Is it OK to use a self created (not the original) tvbuff_t* in the calls to proto_tree_add_text(), will this work 
perfect?

I am new to wireshark dissector development; please help me in resolving these issues.

Thanks,
Varun

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