Antti Lankila created PDFBOX-2105:
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Summary: Support for multipage TIFFs in CCITTFactory, makes PDFBox
capable of doing tiff2pdf
Key: PDFBOX-2105
URL: https://issues.apache.org/jira/browse/PDFBOX-2105
Project: PDFBox
Issue Type: Improvement
Components: PDModel
Reporter: Antti Lankila
Priority: Minor
I created a patch based on Sergey Ushakov's work that handles multipage TIFFs.
This allows fast and efficient conversion from TIFF to PDF
The general approach is to provide a new factory method that accepts an image
(page) number, and then appropriate page number is located when the CCITT
stream is being extracted.
There's a minor inefficiency in this approach because the seek starts from the
beginning for each page, causing O(N^2) algorithm when extracting every page,
but maximum size for file appears to be 2 GB and the cost for finding a single
page will still be low, so I bet this will never come up in practice.
There is no method that tells how many pages TIFF files have. I opted to simply
return null from the factory method that accepts page number if there is no
such page, so users can use this as condition to break from a TIFF to PDF
conversion loop.
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