2 Replies Latest reply: Aug 29, 2014 9:53 PM by tetleyforget

Decompressing a cross reference stream with Params.

tetleyforget Aug 28, 2014 9:14 PM

I'm losing my mind trying to decompress this stream. I've asked everyone and am not having much luck with it. This is a cross reference stream with decode params.

I have used an external library for decompressing this and for some reason, the xref streams just cannot be decoded. I noticed that software designed to decompress pdf files such as Quick Pdf, VeryPdf etc will decompress all streams but these. So there must be something extra about the output of these that I don't understand.

A common error message would be that the stream cannot be displayed because it contains binary data. Very odd. Any clues.

25 0 obj

<</DecodeParms<</Columns 4/Predictor 12>>/Filter/FlateDecode/ID[<6647557224A6C102A60F6D82BB22C18D><AA383B5CF85B7F4BACB9D502B93 343E9>]/Index[10 20]/Info 9 0 R/Length 64/Prev 23381/Root 11 0 R/Size 30/Type/XRef/W[1 2 1]>>stream

hÞbbd ``b`Š ~@‚ñ `Ù $Øù€ W P°~.............compressed stream data.

endstream

endobj

1. Re: Decompressing a cross reference stream with Params.

lrosenth Aug 29, 2014 9:06 AM (in response to tetleyforget)

Do products like Acrobat/Reader or other commercial viewers have any problems with it?

What about popular libraries such as iText, PDFBox, etc?
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2. Re: Decompressing a cross reference stream with Params.

tetleyforget Aug 29, 2014 9:53 PM (in response to lrosenth)

I'm using podofo c++ library. Whilst it is very extensive it won't decompress this stream. I now know what to do.
It's simply a matter of processing the post decompressed data. There is another post on this forum explaining it step by step.
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