Re: [Libjpeg-devel-6x] Unrecognized jpg file

[Mathieu C. <mch...@gm...>]

Hi Tom,

Thanks for your reply.
I don't know much about JPEG marker bytes or hex in general, but
surprisingly, the marker type in the error has so far never been the same.
I just checked on a dozen files and these are the types that came up:
0x49 / 0x1d / 0x18 / 0x3a / 0xbb / 0x53 / 0x69 / 0x61 / 0x63 / 0x40 / 0x43
/ 0x7d / 0x6d
In the three files that I posted, the types were 0x20, 0x10 and 0x06
I also tried opening the files with a hex editor, but couldn't get much out
of it.

Are there any other linux or windows programs I could use to test these
files?
Any other ideas would also be very welcome.

Thanks,
Mathieu

On Tue, Aug 23, 2016 at 6:30 PM, Tom Lane <tg...@ss...> wrote:

> Mathieu Chellat <mch...@gm...> writes:
> > The error message I get is "Error interpreting JPEG image file
> (Unsupported
> > marker type 0x20)".
> > Which sounds more like it does not recognize the file as a jpg file.
>
> No, that sounds more like a corrupted file.  0x20 is not a legal JPEG
> marker byte.
>
> (The fact that you can read it with some other library does not alter the
> conclusion that it's not a valid JPEG file.  Some code is pretty forgiving
> about ignoring garbage; libjpeg is less so.)
>
>                         regards, tom lane
>