wiretap: register most built-in file types from its module.

Remove most of the built-in file types from the table in
wiretap/file_access.c and, instead, have the file types register
themselves, using wtap_register_file_type_subtypes().

This reduces the source code changes needed to add a new file type from
three (add the handler, add the file type to the table in file_access.c,
add a #define for the file type in wiretap/wtap.h) to one (add the
handler).  (It also requires adding the handler's source file to
wiretap/CMakeLists.txt, but that's required in both cases.)

A few remain because the WTAP_FILE_TYPE_SUBTYPE_ #define is used
elsewhere; that needs to be fixed.

Fix the wiretap/CMakefile.txt file to scan k12text.l, as that now
contains a registration routine.  In the process, avoid scanning files
that don't implement a file type and won't ever have a registration
routine.

Add a Lua routine to fetch the total number of file types; we use that
in some code to construct the wtap_filetypes table, which we need to do
in order to continue to have all the values that used to come from the
WTAP_FILE_TYPE_SUBTYPE_ types.

While we're at it, add modelines to a file that lacked them.

1 files changed, 0 insertions, 2 deletions

diff --git a/wiretap/nettl.h b/wiretap/nettl.h
index 226a303936..9e020bbef2 100644
--- a/wiretap/nettl.h
+++ b/wiretap/nettl.h
@@ -117,7 +117,5 @@
 #define NETTL_HDR_PDU_MASK              0x30000000
 
 wtap_open_return_val nettl_open(wtap *wth, int *err, gchar **err_info);
-gboolean nettl_dump_open(wtap_dumper *wdh, int *err, gchar **err_info);
-int nettl_dump_can_write_encap(int encap);
 
 #endif