Re: getting the time

[Brian Oleksa <oleksab () darkcornersoftware com>]

Guy

I am not sure I follow you. Basically all I do is count packets based on 
what I know is in the packet.

Here is the whole packet that I am dissecting: (See below)

So when I get to Time.. I check for
if ((fieldsAvail & 2) != 0)
Then I look at the pointer (which will point me to the right set of bytes).

But how I start the initial counting process is I do the following:

guint8 * ptr = (guint8*) tvb->real_data;

Actually..... maybe you can see your answer better in the code. I have 
attached the packet-helen.c file.

Any help on how I can get and format the time is greatly appreciated.

Thanks,
Brian



Field   Size    Notes   Meaning
Fields Available 	1 	  	Each bit of this byte indicates that a 
particular field is available in this message. See table below.
Status  1/0             GPS status. 0 = Good, 1 = No Fix, 2 = Bad GPS Read
Time 	8/0 	  	GPS Time of the transmitting system. This may be different 
than the system time.
Longitude       4/0             Longitude in decimal degrees (float)
Latitude        4/0             Latitude in decimal degrees (float)
Altitude        4/0             Altitude in decimal meters (float)
Bearing         4/0             Bearing in decimal degrees from north (float)
Speed   4/0             Speed in decimal m/s (float)
Number of Satellites    1/0             Number of satellites current fix is based on

*Note:* Check *Fields Available* to determine if each field is present. 
For floating point fields, the floating point number is written in 
network byte order as if it were a four byte integer.

Bit Mask        Field Referenced
1       Status
2       Time
4       Longitude
8       Latitude
16      Altitude
32      Bearing
64      Speed
128     Number of Satellites



Guy Harris wrote:
> On Jan 21, 2010, at 11:25 AM, Brian Oleksa wrote:
>
>   
> > It is a pointer into the data that I have constructed based on the data 
> > in the packet.
> >     
>
> So what do you have to do to the raw data in the packet to construct that buffer?
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Attachment: packet-helen.c
Description:

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