Hello ,
While writing a dissector for my protocol I'm stuck up at a point .
The description of my problem is provided below :
Suppose my packet is like :
__________________________________________________________
| 7 | 6 | 5 | 4
| 3 | 2 | 1 | 0 | Octet
------------------------------------------------------------------------
------------------------------
| X | Y
| Z | 1
------------------------------------------------------------------------
------------------------------
| Number of Digits
| 2
------------------------------------------------------------------------
------------------------------
| digit 2
| digit 1 | 3
------------------------------------------------------------------------
------------------------------
| ..................................
| ...........
------------------------------------------------------------------------
------------------------------
| digit 2n
| digit 2n-1 | n+2
------------------------------------------------------------------------
-----------------------------
I'm able to display the "digit" information using "
proto_tree_add_string " function , but I'm not getting how to dissect
octet 1 i.e X , Y and Z.
Reason for my confusion is that the messages to be displayed depends
upon the values of X , Y and Z .
Say the messages are as : if X = 0 ; received 0 for X
X = 1 ; received 1 for X
if Y = 0 ; received y value
as 0
Y = 1 ; received y value
as 1
............... and so on
.
If I use { &hf_protox_octet1 , { "octet1 indicator",
"protox.octet1", FT_UINT8, BASE_DEC, VALS(X), 0x0,
"", HFILL }} and
static const value_string X_values[] = {
{ 0, "received 0 for X" },
{ 1, "received 1 for X" },};
it gives the value of entire octet1 and NOT the value of X or Y or Z.
Please suggest how I may get the desired dissection .
Could you also explain in detail about the RANGE_STRING and the
statement
length = tvb_length(tvb).
Regards ,
Vikash
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