Re: Where to find examples of malformed JPEG files

> I guess you could create it yourself, maybe by trying to store a
> JPEG to a floppy disk and yanking it during the save.

That's a bit hit-or-miss. You can easily truncate a file by using
wc(1) if you're on a Unix system:

wc -c500 foo.jpg > broken.jpg

or by using Perl just about anywhere.

perl -e 'truncate "foo.jpg", 500'

For that matter, a GIF file makes a great corrupted JPEG file. Or just
about any other kind of file. It depends on what kind of corruption
you're looking for.

Try opening a JPEG file in a text editor. Saving it back out again
might be enough to corrupt it, depending on your OS and your
editor. If not, then just move the cursor a ways down and add or
delete a single character.

Here's another Perl script:

perl -e 'open F, shift; seek F, 500, 0; print F chr 255' foo.jpg

This replaces the 500th byte in the file foo.jpg with the value 255.
Replace 500 and 255 with anything you like to tailor the corruption
to taste.

b

.

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