Ah, GDAL also changed... Zipping is done by GDAL, so could be a GDAL
related change (there were adjustments in the past regarding ZIP64 that
could result in some bytes being different). Did you try opening the zip
with another utility (like 'unzip' on Linux) ?
This might be then a completely different issue than the one reported by
John.
Le 19/11/2021 à 16:01, Seth G a écrit :
Thanks Even, I'll give that a go (the bisect worked well for another
issue a few months ago).
I presume the zipping issue is more likely to be in the MapServer
codebase than in GDAL?
The GISInternals did switch from GDAL 2.4.4 to GDAL 3.3.3 from the
7.4.3 to 7.6.4 branches.
The zip exports work fine over a web browser rather than command line
which is strange. Maybe its related to modifications to the -nh switch.
Seth
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On Fri, Nov 19, 2021, at 2:07 PM, Even Rouault wrote:
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.
Le 19/11/2021 à 09:43, Seth G a écrit :
Possibly unrelated but I ran into a similar issue exporting WFS to
zipped shapefiles.
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.
7-zip reports "Headers Error Unconfirmed start of archive"
The same command is used for both versions:
mapserv -nh
"QUERY_STRING=map=my.map&service=WFS&REQUEST=GetFeature&TYPENAME=LayerName&version=2.0.0&outputformat=shapezip&srsName=EPSG:3857"
> output.zip
I had a look with a hex editor but the start of the working and
corrupt zips seem identical.
On the other hand all PNGs / WMS services are fine.
Seth
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On Thu, Nov 18, 2021, at 3:53 PM, Steve Lime wrote:
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.
What do you get for output if you use mapserv.exe at the command
line? So something like:
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
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?
--Steve
On Wed, Nov 17, 2021 at 4:57 PM John Huotari via MapServer-users
<[email protected]
<mailto:[email protected]>> wrote:
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.
The good headers from 7.6.1 look like this
89 50 4e 47 0d 0a 1a 0a 00 00 00 0d 49 48 44 52
and the corrupted ones from 7.6.4 look like this
89 50 4e 47 0d 0d 0a 1a 0d 0a 00 00 00 0d 49 48 44 52
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?
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
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
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.
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