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<p>Could be a msIO_needBinaryStdout() missing somewhere. Seth, if
you've the chance to run a git bisect session, that could probably
give a strong hint of how to fix that.<br>
</p>
<div class="moz-cite-prefix">Le 19/11/2021 à 09:43, Seth G a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:6cfd4198-5052-4102-bb76-39fed57450ec@www.fastmail.com">
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<div>Possibly unrelated but I ran into a similar issue exporting
WFS to zipped shapefiles.<br>
</div>
<div>Working fine in 7-4-3 but broken in 7-6-4 (and current
master) - the zip files are corrupt, although they have an
identical size. <br>
</div>
<div><br>
</div>
<div>7-zip reports "Headers Error Unconfirmed start of archive"<br>
</div>
<div><br>
</div>
<div>The same command is used for both versions:<br>
</div>
<div><br>
</div>
<div>mapserv -nh
"QUERY_STRING=map=my.map&service=WFS&REQUEST=GetFeature&TYPENAME=LayerName&version=2.0.0&outputformat=shapezip&srsName=EPSG:3857"
> output.zip<br>
</div>
<div><br>
</div>
<div>I had a look with a hex editor but the start of the working
and corrupt zips seem identical. <br>
</div>
<div><br>
</div>
<div>On the other hand all PNGs / WMS services are fine. <br>
</div>
<div><br>
</div>
<div>Seth<br>
</div>
<div><br>
</div>
<div><br>
</div>
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<div>On Thu, Nov 18, 2021, at 3:53 PM, Steve Lime wrote:<br>
</div>
<blockquote type="cite" id="qt" style="">
<div dir="ltr">
<div>Hmmm... I've not run into or heard of this before
although I'm not a windows user. I did a quick sanity check
with a mapfile here and the latest 7.4 and 7.6 versions.
While not exactly the same setup you have in terms of
versions, they produce the exact same png image.<br>
</div>
<div><br>
</div>
<div>What do you get for output if you use mapserv.exe at the
command line? So something like:<br>
</div>
<div><br>
</div>
<div>
<div> mapserv.exe -nh "QUERY_STRING=
map=dynamic\5708d96b-c606-4c35-95e7-085fedc1dcce.map&SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&FORMAT=image%2Fpng&TRANSPARENT=true&LAYERS=MAP&TILED=true&WIDTH=512&HEIGHT=512&CRS=EPSG%3A3857&STYLES=&BBOX=-10877294.873093722%2C5536486.832751887%2C-10876071.880641159%2C5537709.82520445"
> test.png<br>
</div>
<div><br>
</div>
<div>That would take PostMan and the web server out of the
picture. Is there any chance different versions of libpng
are being used? What are you using to manage the tiles?<br>
</div>
</div>
<div><br>
</div>
<div>--Steve<br>
</div>
</div>
<div><br>
</div>
<div class="qt-gmail_quote">
<div dir="ltr" class="qt-gmail_attr">On Wed, Nov 17, 2021 at
4:57 PM John Huotari via MapServer-users <<a
href="mailto:mapserver-users@lists.osgeo.org"
moz-do-not-send="true">mapserver-users@lists.osgeo.org</a>>
wrote:<br>
</div>
<blockquote class="qt-gmail_quote"
style="margin-top:0px;margin-right:0px;margin-bottom:0px;margin-left:0.8ex;border-left-color:rgb(204,
204,
204);border-left-style:solid;border-left-width:1px;padding-left:1ex;">
<div lang="EN-US">
<div class="qt-gmail-m_4804338606052070718WordSection1">
<p class="qt-MsoNormal">I’m attempting to upgrade from
MapServer 7.6.1 to 7.6.4 via compiled packages
obtained from GISInternals. I’m running it on
Windows/IIS and whereas 7.6.1 was generating .PNG
tiles perfectly for me, after upgrading to 7.6.4, the
.PNGs being created appear to be corrupt. I can
replace the 7.6.4 exe and dlls with 7.6.1 versions and
the PNG images generate fine again, so while there are
quite a few places that could introduce an issue, with
the exception of a change to MapServer everything
would be identical in my stack between having the
issue in 7.6.4 and not in 7.6.1.<br>
</p>
<p class="qt-MsoNormal"> <br>
</p>
<p class="qt-MsoNormal">The good headers from 7.6.1 look
like this<br>
</p>
<p class="qt-MsoNormal"> <br>
</p>
<p class="qt-MsoNormal">89 50 4e 47 0d 0a 1a 0a 00 00
00 0d 49 48 44 52<br>
</p>
<p class="qt-MsoNormal"> <br>
</p>
<p class="qt-MsoNormal">and the corrupted ones from
7.6.4 look like this<br>
</p>
<p class="qt-MsoNormal"> <br>
</p>
<p class="qt-MsoNormal">89 50 4e 47 0d 0d 0a 1a 0d 0a 00
00 00 0d 49 48 44 52<br>
</p>
<p class="qt-MsoNormal"> <br>
</p>
<p class="qt-MsoNormal">It appears that the 0a values
from the valid header are being converted to 0d 0a. I
might be wrong here, but it appears to me that
something is interpreting the 0a as a line feed and
given the code is running on Windows, is converting
that LF into a CR LF. The replacement doesn’t seem to
be limited to the file header as I see the 7.6.4
version of the file is slightly larger (18,571 bytes
instead of 18,407 bytes) and in spot checking, I’ve
verified some additional 0d’s exist precede 0a within
the data blocks of the .PNG. Has anyone experienced
anything like this or know of any fixes?<br>
</p>
<p class="qt-MsoNormal"> <br>
</p>
<p class="qt-MsoNormal">PNG Images produced on the
server with shp2img are just fine, it’s only images
produced by making a WMS request to mapserv.exe that
have the issue. An example WMS request would be<br>
</p>
<p class="qt-MsoNormal"> <br>
</p>
<p class="qt-MsoNormal">https://<Server Name
Removed>/mapserv.exe?map=dynamic\5708d96b-c606-4c35-95e7-085fedc1dcce.map&SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&FORMAT=image%2Fpng&TRANSPARENT=true&LAYERS=MAP&TILED=true&WIDTH=512&HEIGHT=512&CRS=EPSG%3A3857&STYLES=&BBOX=-10877294.873093722%2C5536486.832751887%2C-10876071.880641159%2C5537709.82520445<br>
</p>
<p class="qt-MsoNormal"> <br>
</p>
<p class="qt-MsoNormal">Maybe I’m completely
misdiagnosing the problem as these PNG image files
just show up as corrupted within a browser – for
example FireFox reports “The image <full URL
here> cannot be displayed because it contains
errors.” The way I obtained the actual .PNG images to
view in a binary editor was to use PostMan and save
the body of the results. Perhaps PostMan introduced
the extra bytes when saving an unrecognizable format
file to disk whereas it did not when saving a file it
recognized as a valid PNG. I can’t find anything
different between the valid and invalid files beyond
the extra 0d’s that have been added though, so I don’t
think PostMan or anything else in the chain introduced
them.<br>
</p>
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