Incremental Save using pdfium.

[Chery Cherian]

Hi All, 

We are looking to save a pdf file incrementally using pdfium. We noticed a FPDF_INCREMENTAL flag defined in fpdf_save.h and tried to use it as a parameter to FPDF_SaveAsCopy.

Unfortunately for us that didn't work as expected. Although it appended an additional trailer object to the original content, it did not append the modified object streams.

As a result the document ended up being corrupt.

My questions are:

1. Are we right in assuming that FPDF_INCREMENTAL is for incremental saving (for a write-up on incremental update click here) ?
2. Are there any additional steps that need to be done to get this working?
   
3. Is this a bug ?

Sample attachments:

1. Original document
2. Document saved incrementally using Adobe
3. Corrupt document saved using pdfium.

Kind Regards

Chery

[Dan Sinclair]

That sounds like a bug if it's producing corrupted PDF files. I don't know if the incremental code paths have ever been used so it's quite possible they are broken.  Can you file a bug in the bug tracker [1]? If you can attach a repro program that would be greatly appreciated.

Thanks,

dan

[1] https://bugs.chromium.org/p/pdfium/issues/entry

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[Lei Zhang]

This is probably https://bugs.chromium.org/p/pdfium/issues/detail?id=614

> https://groups.google.com/d/msgid/pdfium/CAMYH%3DOg%2Brcr%3DE4Q8TLJ63qtvkF%2BsbXLhdSY96JxJxoQ4Rvxn0Q%40mail.gmail.com.