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Diffstat (limited to 'doc/README.dissector')
| -rw-r--r-- | doc/README.dissector | 34 |
1 files changed, 4 insertions, 30 deletions
diff --git a/doc/README.dissector b/doc/README.dissector index 59b0900b48..2bc2d638cf 100644 --- a/doc/README.dissector +++ b/doc/README.dissector @@ -1959,6 +1959,10 @@ The syntax for creating a new TVBUFF_SUBSET is: next_tvb = tvb_new_subset(tvb, offset, length, reported_length) +or, in the common case where it should just run to the end of the packet, + +next_tvb = tvb_new_subset_remaining(tvb, offset) + Where: tvb is the tvbuff that the dissector has been working on. It can be a tvbuff of any type. @@ -1977,36 +1981,6 @@ Where: the protocol doesn't say anything about the size of its payload. -An example from packet-ipx.c - - -void -dissect_ipx(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) -{ - tvbuff_t *next_tvb; - int reported_length, available_length; - - - /* Make the next tvbuff */ - -/* IPX does have a length value in the header, so calculate report_length */ - Set this to -1 if there isn't any length information in the protocol -*/ - reported_length = ipx_length - IPX_HEADER_LEN; - -/* Calculate the available data in the packet, - set this to -1 to use all the data in the tv_buffer -*/ - available_length = tvb_captured_length(tvb) - IPX_HEADER_LEN; - -/* Create the tvbuffer for the next dissector */ - next_tvb = tvb_new_subset(tvb, IPX_HEADER_LEN, - MIN(available_length, reported_length), - reported_length); - -/* call the next dissector */ - dissector_next( next_tvb, pinfo, tree); - - 1.8 Editing Makefile.common and CMakeLists.txt to add your dissector. To arrange that your dissector will be built as part of Wireshark, you |