<div dir="ltr">John: What happens if you take WMS out of the equation, so:<div><br></div><div> mapserv.exe -nh "QUERY_STRING= map=dynamic\5708d96b-c606-4c35-95e7-085fedc1dcce.map&mode=map" > test.png</div><div><br></div><div>--Steve</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Nov 19, 2021 at 1:01 PM John Huotari <<a href="mailto:John.Huotari@rcis.com">John.Huotari@rcis.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Thanks for the feedback Jukka, Steve, and Seth.
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Using mapserv.exe –nh at the command line produces the same corrupt PNGs as I get through a web server.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Using MapServer 7.7.0dev from MS4W as Jukka suggested produces good PNGs, so that’s a viable alternative for me.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">I’ve done some playing around with different versions available from GISInternals and it appears that PNG images generate fine up through their GDAL 3.2.1 and
MapServer 7.6.2 version (release-1900-x64-gdal-3-2-1-mapserver-7-6-2), but started producing corrupt PNGs in their GDAL 3.2.2 and MapServer 7.6.2 version (release-1928-x64-gdal-3-2-2-mapserver-7-6-2).<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">If anyone with Windows wants to attempt to reproduce, the older GISInternals versions are available here:
<a href="https://www.gisinternals.com/archive.php" target="_blank">https://www.gisinternals.com/archive.php</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">And the .map file I’m using for testing this is just hitting a publicly-available WMS.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">MAP<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> NAME "MAP"<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> CONFIG "MS_ERRORFILE" "c:/temp/ms_error.txt"<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> CONFIG "PROJ_LIB" "C:/ms/projlib/"<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> EXTENT -20037508.342789244 -20037508.342789244 20037508.342789244 20037508.342789244<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> SIZE 256 256<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> SYMBOLSET "c:\ms\symbols.txt"<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> FONTSET "c:\ms\fonts.txt"<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> IMAGECOLOR 255 255 255<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> TRANSPARENT ON<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> DEFRESOLUTION 72<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> RESOLUTION 72<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> UNITS meters<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> PROJECTION "init=epsg:3857" END<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> WEB<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> METADATA<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> "wms_enable_request" "*"<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> END<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> END<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> LAYER<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> STATUS DEFAULT TYPE RASTER NAME "WMS_DRG"<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> CONNECTIONTYPE WMS CONNECTION "<a href="https://basemap.nationalmap.gov/arcgis/services/USGSTopo/MapServer/WmsServer" target="_blank">https://basemap.nationalmap.gov/arcgis/services/USGSTopo/MapServer/WmsServer</a>?"<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> PROJECTION "init=epsg:3857" END<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> METADATA<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> "wms_srs" "EPSG:3857"<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> "wms_name" "0"<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> "wms_server_version" "1.1.1"<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> "wms_format" "image/png"<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> END<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> END<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">END<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:11pt;font-family:Calibri,sans-serif">From:</span></b><span style="font-size:11pt;font-family:Calibri,sans-serif"> Steve Lime <<a href="mailto:sdlime@gmail.com" target="_blank">sdlime@gmail.com</a>>
<br>
<b>Sent:</b> Thursday, November 18, 2021 8:53 AM<br>
<b>To:</b> John Huotari <John.Huotari@RCIS.com><br>
<b>Cc:</b> <a href="mailto:mapserver-users@lists.osgeo.org" target="_blank">mapserver-users@lists.osgeo.org</a><br>
<b>Subject:</b> [EXTERNAL] Re: [mapserver-users] Corrupted PNG issue<u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal">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.<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">What do you get for output if you use mapserv.exe at the command line? So something like:<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<div>
<p class="MsoNormal"> 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<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<div>
<p class="MsoNormal">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?<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
</div>
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<p class="MsoNormal">--Steve<u></u><u></u></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal">On Wed, Nov 17, 2021 at 4:57 PM John Huotari via MapServer-users <<a href="mailto:mapserver-users@lists.osgeo.org" target="_blank">mapserver-users@lists.osgeo.org</a>> wrote:<u></u><u></u></p>
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<blockquote style="border-top:none;border-right:none;border-bottom:none;border-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4.8pt;margin-right:0in">
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<p class="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.<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">The good headers from 7.6.1 look like this<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">89 50 4e 47 0d 0a 1a 0a 00 00 00 0d 49 48 44 52<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">and the corrupted ones from 7.6.4 look like this<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">89 50 4e 47 0d 0d 0a 1a 0d 0a 00 00 00 0d 49 48 44 52<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="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?<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="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<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal"><a href="https://urldefense.com/v3/__https:/*3CServer__;JQ!!G6MNE2S8Nw!x_ksvCCfwXPiXznbuHZekzR6wQvjCERh2SpiB7YOgt5igg_PFub0fYqcSN2m4Zmt$" target="_blank">https://<Server</a> 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<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="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.<u></u><u></u></p>
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