Re: Pointer to pointer handling in LuaJIT
- From: Delyan Nestorov <delyan.nestorov@xxxxxxxxx>
- To: "luajit@xxxxxxxxxxxxx" <luajit@xxxxxxxxxxxxx>
- Date: Sun, 22 Dec 2013 13:37:28 +0000
That worked. Thank you!
> On 21 Dec 2013, at 02:43, William Adams <william_a_adams@xxxxxxx> wrote:
>
> ffi.new("char *[1]")
>
> Would be an array of one chr*, which
> Since arrays are just pointers, this would be a pointer to a 'char *', which
> is the same as 'char * *'.
>
> Substitute any type for 'char' and the principle should be the same.
>
>
> Would
>
> Sent from my Windows Phone
> From: Delyan Nestorov
> Sent: 12/20/2013 5:23 PM
> To: luajit@xxxxxxxxxxxxx
> Subject: Pointer to pointer handling in LuaJIT
>
> Hi,
>
> I am experimenting with LuaJIT, FFI and libpcap to read packets from live
> capture and "save file". I want to use Lua for parsing pcap files instead of
> Python's dpkt library.
>
> I have test function that will have to read the next packet from live capture
> or pcap file:
>
> function pcap.read_packet(self)
> local p_data = pcap.ffi.new("unsigned char **")
> local p_pkthdr = pcap.ffi.new("struct pcap_pkthdr **")
> local ret = self.lib.pcap_next_ex(self.pp, p_pkthdr, p_data)
> assert(ret >= 0, "end")
> end
>
> The original C definition is:
>
> int pcap_next_ex(pcap_t *, struct pcap_pkthdr** pkt_header, u_char**
> pkt_data);
>
> The question is: how to define, use and dereference pointers to pointers?
>
> Thank you!
>
> Kind regards,
> Delyan
>
>
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