diff options
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/README.tvbuff | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/doc/README.tvbuff b/doc/README.tvbuff index 3284e98a73..2fc0b9e494 100644 --- a/doc/README.tvbuff +++ b/doc/README.tvbuff @@ -1,4 +1,4 @@ -$Id: README.tvbuff,v 1.3 2000/06/08 03:03:43 gram Exp $ +$Id: README.tvbuff,v 1.4 2000/06/15 03:49:00 gram Exp $ TVBUFFs and Exceptions @@ -168,7 +168,7 @@ not. This code snippet shows how: .... - next_tvb = tvb_new_subset(tvb, offset_of_next_protocol, -1); + next_tvb = tvb_new_subset(tvb, offset_of_next_protocol, -1, -1); tvb_compat(next_tvb, &next_pd, &next_offset); That is, next_pd and next_offset will get assigned values relative to @@ -183,9 +183,13 @@ to use tvbuffs. The dissector can create its own tvbuff by using pi.compat_top_tvb, which is the top-level tvbuff created in dissect_packet(). "compat_top_tvb" will only be available during the conversion process; once all dissector have been converted to use -tvbuff's, that variable will disappear. Here is an example, from -packet-cops.c, of how to create your own tvbuff. The use of -the #if/#endif block is optional. +tvbuff's, that variable will disappear. + +A macro called tvb_create_from_top() has been provided to ease +your work. It takes one argument --- the name of the offset variable. + +Here is an example, from packet-cops.c, of how to create your own +tvbuff. The use of the #if/#endif block is optional. /* Code to actually dissect the packets */ #if 0 @@ -198,7 +202,7 @@ dissect_cops(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) { tvbuff_t *tvb; packet_info *pinfo = π - tvb = tvb_new_subset(pinfo->compat_top_tvb, offset, -1, -1); + tvb = tvb_create_from_top(offset); #endif Once we convert all the dissector-table dissectors, the second |