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Topic: How to drop zlib compressed data into PDF
Conf: (P-PDF) Developers, Msg: 117388
From: Okonkwo
Date: 8/17/2004 06:40 AM

Thanks to some help from this forum, I've been able to put together a simple PDF writer.

My last step is to take a block of text, compress it using zlib and put that in the PDF instead of plain text.

To keep it simple, I am trying to replace one text object with a zlib compressed ojbect. The compression itself seems to be working ok. I compressed/decompressed/compared to verify this.

When I drop the compressed block into the doc, PDF reports "An unrecognized token " was found".

This is the text that was in the working object:

/F2 12 Tf
1 0 0 1 50 692 Tm
8 TL
(PLU Number)Tj
1 0 0 1 150 692 Tm
(UPC Code)Tj
1 0 0 1 250 692 Tm
(Item Name)Tj
1 0 0 1 400 692 Tm

When compressed with default compression, it looks like this:


I am setting it up in the PDF like this:

8 0 obj
9 0 obj

and get the error I mentioned. I removed the length object and put /Length 122 in the /Filter line and this produced the same error.

Any ideas?

Thanks for any help.

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