RE: Pointer to pointer handling in LuaJIT
- From: William Adams <william_a_adams@xxxxxxx>
- To: "luajit@xxxxxxxxxxxxx" <luajit@xxxxxxxxxxxxx>
- Date: Fri, 20 Dec 2013 18:43:39 -0800
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<mailto:delyan.nestorov@xxxxxxxxx>
Sent: 12/20/2013 5:23 PM
To: luajit@xxxxxxxxxxxxx<mailto: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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