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Posted to dev@pdfbox.apache.org by Maruan Sahyoun <sa...@fileaffairs.de> on 2017/08/11 08:07:39 UTC
PDFBox and PDF 2.0
Hi,
with PDF 2.0 being available it might be time to start to introduce some of the features in PDFBox (no rush I think as it will need some time to be adopted). One feature I would like to discuss if it would be good to introduce a version support so one could say to save as PDF 2.0 file or some other version. E.g. one could now use utf-8 encoded text strings which will introduce issues in readers not supporting that where some of the other changes like new properties will simply be ignored.
Thoughts?
BR
Maruan
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Re: PDFBox and PDF 2.0
Posted by Tilman Hausherr <TH...@t-online.de>.
Am 11.08.2017 um 18:36 schrieb Maruan Sahyoun:
>> Am 11.08.2017 um 18:24 schrieb Tilman Hausherr <TH...@t-online.de>:
>>
>> Am 11.08.2017 um 10:07 schrieb Maruan Sahyoun:
>>> Hi,
>>>
>>> with PDF 2.0 being available it might be time to start to introduce some of the features in PDFBox (no rush I think as it will need some time to be adopted). One feature I would like to discuss if it would be good to introduce a version support so one could say to save as PDF 2.0 file or some other version. E.g. one could now use utf-8 encoded text strings which will introduce issues in readers not supporting that where some of the other changes like new properties will simply be ignored.
>> We can indicate the version when saving, and we know the version when loading... Maybe what you mean is to propagate the version to the COS classes?
> Yes - as there are some areas in PDF 2.0 - such as utf-8 encoded text strings - which we would need to enable e.g. when generating a document from scratch or adding new annotations. Currently if we pass text as an input to some of our setters when writing out the file it will not use utf-8 text strings which is fine as it will ensure that older readers are able to read the content. But if you'd like to 'enforce' 2.0 there is currently now way in doing so.
Does 2.0 require strings to be utf8 ? Or can one still use unicode?
Tilman
>
> For other areas where there is a new 'PDF Object' or property with 2.0 we can wait until there is demand for it and let the developer decide if that shall be used (the same way we handle it today as there is no specific version support in PDFBox i.e. one could declare the file as being 1.4. compliant but use 1.7 features wthout any complaints). The low level lib we are I think that's acceptable.
>
> Maruan
>
>> Tilman
>>
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>>
>
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Re: PDFBox and PDF 2.0
Posted by Andreas Lehmkühler <an...@lehmi.de>.
> Maruan Sahyoun <sa...@fileaffairs.de> hat am 11. August 2017 um 18:36 geschrieben:
>
>
>
> > Am 11.08.2017 um 18:24 schrieb Tilman Hausherr <TH...@t-online.de>:
> >
> > Am 11.08.2017 um 10:07 schrieb Maruan Sahyoun:
> >> Hi,
> >>
> >> with PDF 2.0 being available it might be time to start to introduce some of the features in PDFBox (no rush I think as it will need some time to be adopted). One feature I would like to discuss if it would be good to introduce a version support so one could say to save as PDF 2.0 file or some other version. E.g. one could now use utf-8 encoded text strings which will introduce issues in readers not supporting that where some of the other changes like new properties will simply be ignored.
> >
We need to support such 2.0 features as there will be some people who will use PDFBox to render such pdfs. And if we add that utf-8 support for reading it shouldn't be that hard to add it for writing as well.
I like Maruans idea to add some version support. So that adding some features to a pdf could change the version automatically or could trigger an exception.
Andreas
> > We can indicate the version when saving, and we know the version when loading... Maybe what you mean is to propagate the version to the COS classes?
>
> Yes - as there are some areas in PDF 2.0 - such as utf-8 encoded text strings - which we would need to enable e.g. when generating a document from scratch or adding new annotations. Currently if we pass text as an input to some of our setters when writing out the file it will not use utf-8 text strings which is fine as it will ensure that older readers are able to read the content. But if you'd like to 'enforce' 2.0 there is currently now way in doing so.
>
> For other areas where there is a new 'PDF Object' or property with 2.0 we can wait until there is demand for it and let the developer decide if that shall be used (the same way we handle it today as there is no specific version support in PDFBox i.e. one could declare the file as being 1.4. compliant but use 1.7 features wthout any complaints). The low level lib we are I think that's acceptable.
>
> Maruan
>
> >
> > Tilman
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: dev-unsubscribe@pdfbox.apache.org
> > For additional commands, e-mail: dev-help@pdfbox.apache.org
> >
>
>
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Re: PDFBox and PDF 2.0
Posted by Maruan Sahyoun <sa...@fileaffairs.de>.
> Am 11.08.2017 um 18:24 schrieb Tilman Hausherr <TH...@t-online.de>:
>
> Am 11.08.2017 um 10:07 schrieb Maruan Sahyoun:
>> Hi,
>>
>> with PDF 2.0 being available it might be time to start to introduce some of the features in PDFBox (no rush I think as it will need some time to be adopted). One feature I would like to discuss if it would be good to introduce a version support so one could say to save as PDF 2.0 file or some other version. E.g. one could now use utf-8 encoded text strings which will introduce issues in readers not supporting that where some of the other changes like new properties will simply be ignored.
>
> We can indicate the version when saving, and we know the version when loading... Maybe what you mean is to propagate the version to the COS classes?
Yes - as there are some areas in PDF 2.0 - such as utf-8 encoded text strings - which we would need to enable e.g. when generating a document from scratch or adding new annotations. Currently if we pass text as an input to some of our setters when writing out the file it will not use utf-8 text strings which is fine as it will ensure that older readers are able to read the content. But if you'd like to 'enforce' 2.0 there is currently now way in doing so.
For other areas where there is a new 'PDF Object' or property with 2.0 we can wait until there is demand for it and let the developer decide if that shall be used (the same way we handle it today as there is no specific version support in PDFBox i.e. one could declare the file as being 1.4. compliant but use 1.7 features wthout any complaints). The low level lib we are I think that's acceptable.
Maruan
>
> Tilman
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: dev-unsubscribe@pdfbox.apache.org
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>
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Re: PDFBox and PDF 2.0
Posted by Tilman Hausherr <TH...@t-online.de>.
Am 11.08.2017 um 10:07 schrieb Maruan Sahyoun:
> Hi,
>
> with PDF 2.0 being available it might be time to start to introduce some of the features in PDFBox (no rush I think as it will need some time to be adopted). One feature I would like to discuss if it would be good to introduce a version support so one could say to save as PDF 2.0 file or some other version. E.g. one could now use utf-8 encoded text strings which will introduce issues in readers not supporting that where some of the other changes like new properties will simply be ignored.
We can indicate the version when saving, and we know the version when
loading... Maybe what you mean is to propagate the version to the COS
classes?
Tilman
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