wiretap: Update README.developer
Update the wiretap README.developer for the changes from
commit b8b3531883
in how to
register a new file type. (Also, update from referring to
"open_routines_base[]" to "open_info_base[]").
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@ -4,9 +4,6 @@ submit patches - free software is a community effort....
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To add the ability to read a new capture file format, you have to:
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add a new WTAP_FILE_ value for the file type to
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"wiretap/wtap.h";
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write an "open" routine that can read the beginning of the
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capture file and figure out if it's in that format or not,
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either by looking at a magic number at the beginning or by using
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@ -31,20 +28,21 @@ To add the ability to read a new capture file format, you have to:
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"subtype_close" member of the "wtap" structure to point to it,
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otherwise leave it set to NULL;
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add a pointer to the "open" routine to the "open_routines_base[]"
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table in "wiretap/file_access.c" - if it uses a magic number, put
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it in the first section of that list, and, if it uses a heuristic,
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put it in the second section, preferably putting the heuristic
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routines for binary files before the heuristic routines for text
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files;
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add an entry for that file type in the "open_info_base[]" table
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in "wiretap/file_access.c", giving a pointer to the "open" routine,
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a name to use in file open dialogs, whether the file type uses a
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magic number or a heuristic, and if it uses a heuristic, file
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extensions for which the heuristic should be tried first. More
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discriminating and faster heuristics should be put before less
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accurate and slower heuristics;
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add an entry for that file type in the "dump_open_table_base[]" in
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"wiretap/file_access.c", giving a descriptive name, a short name
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that's convenient to type on a command line (no blanks or capital
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letters, please), common file extensions to open and save, a flag
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if it can be compressed with gzip (currently unused) and pointers
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to the "can_write_encap" and "dump_open" routines if writing that
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file is supported (see below), otherwise just null pointers.
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add a registration routine passing a "file_type_subtype_info" struct
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to wtap_register_file_type_subtypes(), giving a descriptive name, a
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short name that's convenient to type on a command line (no blanks or
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capital letters, please), common file extensions to open and save,
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any block types supported, and pointers to the "can_write_encap" and
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"dump_open" routines if writing that file is supported (see below),
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otherwise just null pointers.
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Wiretap applications typically first perform sequential reads through
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the capture file and may later do "seek and read" for individual frames.
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@ -84,6 +82,7 @@ To add the ability to write a new capture file format, you have to:
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to it;
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put pointers to the "can_write_encap" and "dump_open" routines
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in the "dump_open_table_base[]" entry for that file type.
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in the "file_type_subtype_info" struct passed to
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wtap_register_file_type_subtypes().
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In the wiretap directory, add your source file to CMakelists.txt.
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