Add a packet count var for pcap file mode to the Packet structure to ease debugging.

src/decode.h

@@ -319,6 +319,9 @@ typedef struct Packet_
     /* IPS action to take */
     uint8_t action;
 
+    /** packet number in the pcap file, matches wireshark */
+    uint64_t pcap_cnt;
+
     /* double linked list ptrs */
     struct Packet_ *next;
     struct Packet_ *prev;

src/source-pcap-file.c

@@ -51,6 +51,7 @@ typedef struct PcapFileGlobalVars_ {
     void (*Decoder)(ThreadVars *, DecodeThreadVars *, Packet *, u_int8_t *, u_int16_t, PacketQueue *);
     int datalink;
     struct bpf_program filter;
+    uint64_t cnt; /** packet counter */
 } PcapFileGlobalVars;
 
 typedef struct PcapFileThreadVars_
@@ -150,6 +151,8 @@ TmEcode ReceivePcapFile(ThreadVars *tv, Packet *p, void *data, PacketQueue *pq)
         EngineStop();
         SCReturnInt(TM_ECODE_FAILED);
     }
+    p->pcap_cnt = pcap_g.cnt;
+    pcap_g.cnt++;
 
     SCReturnInt(TM_ECODE_OK);
 }