I've been searching for a couple days now and still haven't found a good definitive description of a JPG file. I have some general formats, but the format and the file itself does not coincide. The problem comes with the "ff e1" header bytes. The file contains:
Alledgedly, the two bytes after "FF Ex" represent the length of the current block. In this case, the size at 16h clocks in at a whopping AB4h bytes. But the next block is a mere 15Ch bytes after the "FF E1"

Is there a better definition somewhere? wotsit.org was helpful, but no explanation for this problem is in their documentation (unless I missed it or misread)

Thanks

__________________

During the election they said Obama could only be elected when pigs fly. Well, we currently have an epidemic of Swine Flu. Coincidence?

You can get the source code for jpeg compression here:
http://ftp.belnet.be/pub/mirror/suns...0/jpegsr6b.zip

I found them from this site: http://www.computerbuddies.us/what_is_a_jpg.htm

Or maybe your answer will be found here: http://www.faqs.org/faqs/jpeg-faq/ and here: http://www.faqs.org/faqs/compression-faq/

Rob