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Images that display in IE, but not in Picture-and-fax viewer (nor FireFox)



 
 
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  #31  
Old December 21st 18, 08:40 AM posted to microsoft.public.windowsxp.general
JJ[_11_]
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Posts: 744
Default Images that display in IE, but not in Picture-and-fax viewer (nor FireFox)

On Thu, 20 Dec 2018 13:13:46 +0100, R.Wieser wrote:

:-) Pretty-much the reason I came he Either someone recognising this
behaviour, or knowing about how to do such analysis / where to find such an
tool. Beyond walking thru the GIF/JPG files block structure I mean. That
I've already done.


You could go beyond that by making your own simple image loader application
(no need to display the image) using an open source image decoder library
where it provides all of the necessary components (e.g. ZLib, GZip, etc.),
so that you can compile it with debug build and be able to debug the library
at source code level. When the library fails to load the image, you can
trace it back to find out why it failed.
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  #32  
Old December 21st 18, 09:06 AM posted to microsoft.public.windowsxp.general
R.Wieser
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Posts: 1,302
Default Images that display in IE, but not in Picture-and-fax viewer (nor FireFox)

JJ,

You could go beyond that by making your own simple image loader
application (no need to display the image) using an open source image
decoder library


:-) I already did, using the FreeImage DLL (don't ask. Just one of those
"can I do that myself ?" / "I'd like to have feature X" cases). Which is
how I ran into the "IE displays it, others don't" gotcha in the first place.

so that you can compile it with debug build


:-) I'm not a C{something} programmer, so its not just an easy "just grab
a repository and compile" for me (FYI, I'm using Assembly. Yeah, I'm one of
a dying breed. :-) ). I could stil do it I suppose, but it would take me
quite a bit of time and effort (effectivily recreating the whole DLL
myself). Which I'm not quite certain if its worth it ...

Regards,
Rudy Wieser


  #33  
Old December 22nd 18, 12:16 AM posted to microsoft.public.windowsxp.general
JJ[_11_]
external usenet poster
 
Posts: 744
Default Images that display in IE, but not in Picture-and-fax viewer (nor FireFox)

On Fri, 21 Dec 2018 09:06:02 +0100, R.Wieser wrote:

:-) I'm not a C{something} programmer, so its not just an easy "just grab
a repository and compile" for me (FYI, I'm using Assembly. Yeah, I'm one of
a dying breed. :-) ). I could stil do it I suppose, but it would take me
quite a bit of time and effort (effectivily recreating the whole DLL
myself). Which I'm not quite certain if its worth it ...


Well, nothing will came out if you don't do anything.

And I find this quite interresting, because it can be used to make images
which are only for MSIE, or some kind of protection.
  #34  
Old December 23rd 18, 08:58 AM posted to microsoft.public.windowsxp.general
R.Wieser
external usenet poster
 
Posts: 1,302
Default Images that display in IE, but not in Picture-and-fax viewer (nor FireFox)

JJ,

Well, nothing will came out if you don't do anything.


On the other hand, diving into something you have little to no actual
knowledge about could get you killed (if in this case just not in the
literal sense). :-p

Also, i'm afraid that going for a rewrite of such a DLL is a bit too tall
order for my current capabilities (heck, I've still got problems with
implementing a simple GIF compression on my own).

I've been putting some work into a re-encoding solution (which works, but
now I want to keep the origional metadata too), but will most likely do a
headers-only dump in the near future to see if I can spot a pattern. If
only to make detecting the "broken" images easier (if its actually an
encoding problem that re-encoding wil be the only available solution)

And I find this quite interresting, because it can be used to make
images which are only for MSIE, or some kind of protection.


John suggested, and I agreed, that it can be a case of an experimental
encoding which just didn't get into the standard - but kept being supported
by MS because they where the ones that came up with it (bit of guesswork
there). A backtrack thru the involved RFCs might shed some light on which
encoding it was.

Regards,
Rudy Wieser


 




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