[jira] [Created] (PDFBOX-2105) Support for multipage TIFFs in CCITTFactory, makes PDFBox capable of doing tiff2pdf

["Antti Lankila (JIRA)" <ji...@apache.org>]

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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