My requirement is to read the 2-3GB file sequentially (in order of
bookmarks), extract contents w.r.t bookmarks and create the smaller PDF
based on previous result.

I believe to read the large PDF, I need to use input stream as below. 

InputStream inputStream = new FileInputStream(INPUTFILE);
PdfReader reader = new PdfReader(inputStream);

List<HashMap&lt;String, Object>> bookmarks =
SimpleBookmark.getBookmark(reader);
....

Please let me know if the above requirement is feasible with iText 4.2x or I
will need to use iText 5.x version.

Regards,
Naveen



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