Hi ,
I have encountered some problems when dissecting the packets
for a protocol.I am mentioning 3 different scenarios
1.
In the below case , the octet is split into parts and each
part viz x , y and z take different values.
I am not able to understand how to go about it.
PARAMETER
1
|
7
|
6
|
5
|
4
|
3
|
2
|
1
|
0
|
octet
|
|
X
|
Y
|
Z
|
3
|
|
Number of Digits
|
4
|
|
Digit 2
|
Digit 1
|
5
|
|
Digit 4
|
Digit 3
|
6
|
|
Digit 2n
|
Digit 2n-1
|
n+4
|
SUB
PARAMETER X
|
Value
|
Description
|
|
0
1
|
aaa
bbb
|
SUB PARAMETER Y
|
Value
|
Description
|
|
0
1
2
3
|
A
B
C
D
|
2.
In the parameter mentioned below the value may come in
a range,. How can we dissect such values??
PARAMETER
2
|
Value
|
Description
|
|
0
1-10
10-255
|
Not used
xxx
yyy
|
3.
In the following parameter, the value of each bit indicates
if the assosiated version is currently used or not.
Value 0 : not used
Value 1 : used
PARAMETER
3
|
Bit7
|
Bit6
|
Bit5
|
Bit4
|
Bit3
|
Bit2
|
Bit1
|
Bit0
|
octet
|
|
|
|
|
|
|
|
|
|
|
Is it possible to include such informations, which depend
upon whether a bit is set or not , in the dissector .
Regards ,
Tarani
