ZLib Error

[jpt13653903]

When using GhostScript to reduce the output PDF size, it complains: warning: ignoring zlib error: incorrect data check

The command-line used is gswin64c -q -dNOPAUSE -dBATCH -dSAFER -sDEVICE=pdfwrite -dCompatibilityLevel=1.3 -dPDFSETTINGS=/screen -dEmbedAllFonts=true -dSubsetFonts=true -dColorImageDownsampleType=/Bicubic -dColorImageResolution=144 -dGrayImageDownsampleType=/Bicubic -dGrayImageResolution=144 -dMonoImageDownsampleType=/Bicubic -dMonoImageResolution=144 -sOutputFile=P2-510xxxx_xx_gs.pdf P2-510xxxx_xx.pdf

[jpt13653903]

Note to self: I should probably just drop my own deflate algorithm and use the zlib library instead...

[JonThe640]

Is it a long and hard work for you?

[jpt13653903]

Probably not, but I don't foresee finding sufficient time any time soon.

I will keep this thread posted with comments when I do any updates though.

[JonThe640]

I can't wait to try the new update to try reducing file size with ghostscript. Thanks again and Marry Christmas!!!

[JonThe640]

Happy New year 2023 John-Philip and thanks for your support !!!

Jonathan

Merci / Thanks

Jonathan Thérien Sr PCB designer Kontron

[JonThe640]

Hello John, any update about your project?

[jpt13653903]

I really don't foresee finding sufficient time any time soon. My day job is keeping me busy -- expect months, rather than weeks.

[JonThe640]

Hi John, how are you? Did you find time to work on this issue this spring? Thanks and have a nice day!

[jpt13653903]

Hello, I'm doing well, thank you :-)

I don't really want to keep you on a line, so let's fix a date... My best estimate at the moment is that I'll find some time over the summer holidays (i.e. late December in South Africa). I strongly doubt anything will happen before then -- too much stuff happening in my day-job.

If you happen to have a friend who knows his way around a G++ compiler, he can replace JDeflate with a more sensible implementation with similar interface (maybe using the ZLib library instead of my own silly attempt I did back in the day as a fun exercise) and send me a pull-request...

[JonThe640]

thanks for the update.

[JonThe640]

Hi John, how are you? Did you find time to work on this issue this winter? Thanks and have a nice day!

[jpt13653903]

Still doing well - thank you.

And no - the ETA is still late December

[jpt13653903]

I've started looking into this... You can follow what I'm doing in the feature/zlib branch. My plan is to simply refactor my Deflate class to use the zlib library instead, and then we can go from there... I have not tried to reproduce your error yet.

[jpt13653903]

@JonThe640 I have not tried to reproduce your issue -- I simply updated the code-base to use the industry-standard ZLib library instead of my own implementation. Please could you confirm if your issue is now resolved?

[JonThe640]

Hi John, happy new year. I will try it and i will confirm if it works for me. thanks!!

[JonThe640]

hi J-P, i tried at my home and when i execute the file Gerber2pdf.exe. It give me an error

[jpt13653903]

Thanks for testing... I thought I statically linked it so that you don't need the DLL -- obviously not... I'll try again

[jpt13653903]

Update available here

Let's hope this one works better...

[JonThe640]

thanks, no error now!

[jpt13653903]

Awesome news :-)

let me know when you've thoroughly tested it -- then I'll close this issue.

[JonThe640]

Hi, i sent you an email about a bug when we have copper plane. Thanks!!

[jpt13653903]

Got it -- I'll have a look over the weekend :-)

[jpt13653903]

I'm going to move this to a new issue -- it's not about ZLib anymore...