add some support for random access of data in packet fifos

dev/pktfifo.cc:
    add support for copying arbitrary data out of a
    packet fifo
dev/pktfifo.hh:
    add support for copying arbitrary data out of a
    packet fifo.
    Add functions to determine where in the fifo a
    particular packet is

--HG--
extra : convert_revision : f8ddc994ce8577f29af0de3fa418a01e4e2cb0f1

1 files changed, 29 insertions, 0 deletions

diff --git a/dev/pktfifo.hh b/dev/pktfifo.hh
index e63fd291f..e245840a8 100644
--- a/dev/pktfifo.hh
+++ b/dev/pktfifo.hh
@@ -127,6 +127,35 @@ class PacketFifo
         fifo.erase(i);
     }
 
+    bool copyout(void *dest, int offset, int len);
+
+    int countPacketsBefore(iterator end)
+    {
+        iterator i = fifo.begin();
+        int count = 0;
+
+        while (i != end) {
+            ++count;
+            ++i;
+        }
+
+        return count;
+    }
+
+    int countPacketsAfter(iterator i)
+    {
+        iterator end = fifo.end();
+        int count = 0;
+
+        while (i != end) {
+            ++count;
+            ++i;
+        }
+
+        return count;
+    }
+
+
 /**
  * Serialization stuff
  */