Broken/incomplete JPEGs from phoneThumbnail field

[Ianseeks]

On Tuesday, 7 November 2017 18:55:33 GMT Andy Holmes wrote:
> Actually, I didn't notice until just now, but Gmail seems to correctly
> render the JPEG I attached, which is definitely broken. Gimp prints
> the same warning as jpeginfo but also renders the JPEG correctly. I'll
> attach a PNG screenshot of how it's being rendered with GdkPixbuf.
> 
> I can't tell if they are also broken with KDE Connect, actually, since
> they are rather small and QPixmap might be handling errors like other
> programs apparently do. This doesn't seem to happen when the icons are
> passed via a "payload" transfer, only in the telephony plugin as
> base64 bytearray.
I had a similar problem where a transfer via kdeconnect would not complete, it got to about 80-90% but if i transferred the same files with dolphin, it worked fine.  I forgot to charge my phone and as a result of the "reboot", it cleared the problem. 

> I've tried decoding and rendering the pixbuf directly and saving the
> JPEG to disk in the implementation and re-reading. Even hand copying
> the base64 from terminal output, converting the base64 and saving to
> file has the same results.
> 
> On Tue, Nov 7, 2017 at 6:20 AM, Albert Vaca <albertvaka at gmail.com> wrote:
> > I don't follow the problem: Are they also broken when received with KDE
> > Connect, or only when receiving them using your implementation? Is the issue
> > found when creating the image, or when reading it afterwards?
> >
> > On Sat, Nov 4, 2017 at 4:16 AM, Andy Holmes <andrew.g.r.holmes at gmail.com>
> > wrote:
> >>
> >> Hi,
> >>
> >> I'm writing a small program to interact with the KDE Connect android
> >> app in GLib/Gtk and I'm encountering problems with the base64
> >> phoneThumbnails being transmitted with telephony events.
> >>
> >> I'm not at all familiar with QPixmap but I assume it's comparable to
> >> GdkPixbuf, so doubt this is the problem. I've used the utility
> >> jpeginfo to confirm the image is broken and Eye of Gnome to confirm
> >> that image can be opened (and I'm decoding the data correctly) but is
> >> corrupted. I'll attach the corrupted JPEG and below is the
> >> jpeginfo/GdkPixbuf output:
> >>
> >> jpeginfo:
> >>
> >> test.jpg   96 x 96   24bit JFIF  Normal Huffman    4191  Premature end
> >> of JPEG file  [WARNING]
> >>
> >> GdkPixbuf:
> >>
> >> GdkPixbuf.PixbufError: Error interpreting JPEG image file (Application
> >> transferred too few scanlines)
> >>
> >> I can also confirm that libfolks is obtaining the same avatars
> >> correctly, so I don't believe these images are broken at the source.
> >> Could anyone advise on how I might try and track these errors down?
> >
> >
> 



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