Hello,
I just need some help in using tvbuff_t. In my dissector sourse, I
have a function that decompresses and decrypts the bytes (buffer) passed
into it.
I have tried using the function "tvb_get_ephemeral_string" to grab the
complete buffer till the end(using -1 for length) but I get an error in
ethereal that says "Malfunctioned Packet" since I am also using the buffer
to display some other contents of the protocol and after using this command
I cannot access the default buffer "tvb". Nothing is displayed after that.
Using the "tvbuff.h" file and its inplementation in "tvbuff.c", I understand
that there are some other functions which will enable me to create a buffer
of type tvbuff_t and then use the "guint8 *realdata" part of the tvbuff_t
obtained to pass into my function. What functions are those? But this
process will require creating another tvbuff_t.
I am not using the function "tvb_get_ptr" because there is a comment in
"tvbuff.h" file that says:
* The returned pointer is data that is internal to the tvbuff, so do not
* attempt to free it. Don't modify the data, either, because another tvbuff
* that might be using this tvbuff may have already copied that portion of
* the data (sometimes tvbuff's need to make copies of data, but that's the
* internal implementation that you need not worry about). Assume that the
* guint8* points to read-only data that the tvbuff manages.
What would be a better and effective solution that won't effect the default
tvbuff_t "tvb" in this case. I only need a guint8* to pass into my function
that performs the decompression/decryption.
Thanks,
Jasim Tariq