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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