[pdftex] [CWEB] Validation of PDF output fails

Ross Moore ozross at icloud.com
Thu Jun 16 21:28:48 CEST 2022

Hi Andreas.

Glad you could track the ultimate cause of the issue. However I do not yet understand just what was actually going wrong inside the PDF.

Those extra validations you did could never work, as they were for PDF/A. But certainly the document was not claiming this, so the errors being reported were not applicable. Of course things required in PDFA would be missing. 

A possible test might be to put
(or 6 or 7) to see what difference this makes in the validation. 
To have any effect this must be done very early in the TeX source.

And also setting
results in an uncompressed PDF which can be viewed in a text editor.
Then a diff tool can be used to compare the results from the different minor versions, to locate what (if anything) is version dependent.

All the best.


Sent from my iPhone

> On 17 Jun 2022, at 12:09 am, Andreas Scherer <andreas_tex at freenet.de> wrote:
> Hello, again!
>> this new issue for CWEB (https://aus01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fascherer%2Fcweb%2Fissues%2F39&data=05%7C01%7Cross.moore%40mq.edu.au%7C28d18f258e454ca7d99608da4fa1b4b6%7C82c514c1a7174087be06d40d2070ad52%7C0%7C0%7C637909853611040187%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=L5MFoipmf1sy2eCZj0FW8F5TRmULCIqtMu2m2GVeBkA%3D&reserved=0)
> was caused by a twenty year old bug in 'cwebmac.tex'!
> '\pdftextrue' does _not_ also mean '\pdftrue' in the old sense of 'cwebmac.tex'. However, 'iftex.sty' sets '\pdftrue' for the PDFTeX engine, too, for obvious reasons.
> Case closed!
> Andreas

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