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| -rw-r--r-- | doc/README.developer | 17 |
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diff --git a/doc/README.developer b/doc/README.developer index 63261d0b90..d74062621a 100644 --- a/doc/README.developer +++ b/doc/README.developer @@ -1283,6 +1283,23 @@ separator between two consecutive items, and will not add the separator at the beginning of the column. The remainder of the work both functions do is identical to what 'col_append_str' and 'col_append_fstr' do. +1.5.8 The col_set_fence and col_prepend_fence_fstr functions. + +Sometimes a dissector may be called multiple times for different PDUs in the +same frame (for example in the case of SCTP chunk bundling: several upper +layer data packets may be contained in one SCTP packet). If the upper layer +dissector calls 'col_set_str()' or 'col_clear()' on the Info column when it +begins dissecting each of those PDUs then when the frame is fully dissected +the Info column would contain only the string from the last PDU in the frame. +The 'col_set_fence' function erects a "fence" in the column that prevents +subsequent 'col_...' calls from clearing the data currently in that column. +For example, the SCTP dissector calls 'col_set_fence' on the Info column +after it has called any subdissectors for that chunk so that subdissectors +of any subsequent chunks may only append to the Info column. +'col_prepend_fence_fstr' prepends data before a fence (moving it if +necessary). It will create a fence at the end of the prended data if the +fence does not already exist. + 1.6 Constructing the protocol tree. The middle pane of the main window, and the topmost pane of a packet |