Re: new dissector - dynamic value string table?

[<Michal.Labedzki () tieto com>]

Hi Max,

> On the first question of detecting the camera type, it looks like the
> information I need is captured by packet-usb.c (emem_tree_t
> *device_to_product_table) -- however it's not exported.   I will need to
> add a way of getting access to this tree from the new dissector.

I guess you do not want to export it. Instead, you can extent private_info in packet.usb.c for exporting 
vendor_id/product_id (etc.)  to higher protocol (see packet-hci_usb.c).

As I understand correctly you also need to do something like that:
static const value_string vendor_xxx_specific_vals[] = {
    {0x0001, "A"},
    {0x0401, "B"},
    {0x0402, "C"},
    {0, NULL}
};

static const value_string generic_vals[] = {
    {0x0001, "A"},
    {0x0401, "X"},
    {0x0555, "O"},
    {0, NULL}
};

/*...*/

gchar *unknown_key = "Unknown";
gchar *value;

for (i=0;i <vendors; i+= 1) {
    value = val_to_str_const(vendor_key, vendor_xxx_specific_vals, unknown_key);
    if (value == unknown_key) {
        value = val_to_str_const(vendor_key, generic_vals, unknown_key);
        hf = hf_generic;
    } else {
    hf = hf_vendor_xxx
    }
}

proto

/*...*/

{ &hf_vendor_xxx_type,
    { "Something", "usb.xxx.something",
    FT_UINT16, BASE_HEX, VALS(vendor_xxx_specific_vals), 0x00,
    NULL, HFILL }
},
{ &hf_generic_type,
    { "Something", "usb.xxx.something",
    FT_UINT16, BASE_HEX, VALS(generic_vals), 0x00,
    NULL, HFILL }
},

See also "hf_usb_idProduct". It use table created by merge vendor id and product id in one key.


Pozdrawiam / Best regards
-------------------------------------------------------------------------------------------------------------
Michał Łabędzki, Software Engineer
Tieto Corporation
Product Engineering Services
http://www.tieto.com / http://www.tieto.pl
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