Hello, I am using PDFBox 1.8.9 for my product which would read acroform fields and write into acroform fields of a PDF. Right now, I have two versions of a PDF given to us by a potential customer, one is compressed and another is not. The PDF contains a bunch of acroform fields and it is three pages long. Sorry, I cannot share the PDF because of restrictions.
The size of the uncompressed file is 1.67 MB and the size of the compressed version is 27 KB. I could open both the PDFs in Reader X1, foxit reader and many other reader software and I am able to successfully modify values for acroform fields and save them. When I open the uncompressed PDF using PDDocument.load(File f), I am able to successfully read from and write into the many acroform fields using the below API calls: PDDocumentCatalog docCatalog = document.getDocumentCatalog(); PDAcroForm acroForm = docCatalog.getAcroForm(); However, I am unable to see any acroForm fields when I open the compressed PDF. I opened the compressed PDF using notepad and I Could see that the objects have been compressed using FlateEncoding. The below line is from the first page of the PDF: 2 0 obj <</Filter/FlateDecode/Length 5675>>stream .... .... .... endstream endobj I see a FlateFilter.java class with encode and decode methods which are inturn used by public methods in COSStream.java. I am unable to connect the dots and flatedecode the PDF. My question is: how do I flatedecode a PDF so that I can find all the acroform fields within it. ANy help or pointers would be highly appreciated. Thanks, Balaji
