Anton Shterenlikht wrote:
On Fri, Dec 18, 2009 at 02:09:58AM +0100, Rolf Nielsen wrote:
Anton Shterenlikht wrote:
I'm creating binary files in fortran.
Fortran adds 4 byte record delimiters at the beginning
and the end of each record, which, in the case of a binary
file, is just at the beginning and at the end of the file.
I need to delete these record delimiters, because the
software I use to visualise the binary files interprets
them as data. But I don't know how. I've looked at
hexdump and od, but those are only dumping (I think)
file contents, and I cannot see how to edit a file with them.
Any advice?
many thanks
anton
Hello Anton,
My bet would be /usr/ports/editors/hexedit. Been a while since I've used
it, but AFAIR, it has a curses or a curses like interface, and it's
fairly simple to use, yet sufficiently powerful for most normal binary
editing. If you want a GUI, I believe gnome (and probably KDE as well)
has its own hex editor.
thank you. hexedit does the job on small files, but is quite
clunky. If I've a xGB file and I need to delete the first and
the last record, this becomes quite hard, if at all possible.
I didn't appreciate it's not that simple.
Perhaps I can read a file with C and write back? I can't
remember if C supports binary files, and whether it
also writes some record delimiters.
many thanks
anton
How about one of these then?
http://www.freebsd.org/cgi/url.cgi?ports/editors/bless/pkg-descr
Main Features
-------------
* Efficient editing of large data files.
* Multilevel undo - redo operations.
* Customizable data views.
* Fast data rendering on screen.
http://www.freebsd.org/cgi/url.cgi?ports/editors/lfhex/pkg-descr
Features:
- Low memory usage with respect to filesize. Opening a 2gig file
requires
only ~1.4megs of additional memory.
- Fast load times.
- Fast save times.
- Infinite undo/redo.
- Conversion dialog
- Search function.
- Shows modified regions in alternate color.
- Scalable working area. Resize can use as much screen as you give it.
- Multiple editing modes (can switch on the fly)
- Runtime configurable bytes per column.
- binary comparison user interface
I haven't tried either of them myself, but they do look promising.
Rolf
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