Any object digestate of calculation

Hi all

I encountered some problems when I tried calculate summaries of the object. I read the digital 8 "Signature" chapter and annex I "Digest calculation of the object" in PDF Reference, but still failed to get a clear vision on how to calculate the digest of the object. I mean that the PDF reference gives clear instructions on some details.

For example, the note in the section 8.7.1(page 731 de référence PDF, version 1.7) says that "all processing methods preclude the dictionary of the signature of the object digest.", so when I meet a dictionary of signature, I should treat it as an empty dictionary (06 00 00 00 00)? Or treat it like a visited object (06 FF FF FF FF)? Or treat it like nothing?

An another exmple, table I.1 in annex I (page 1132) shows how to deal with the types of basic objects. The description on the dictionary type is that 'a 4-byte unsigned value (most important),"by specifying the number of entries in the dictionary I wonder "number of entries" is the number of entries that must be digested or the number of all entries in the dictionary?

I wait your help. A sample of a "Digest" of the white page object computing will be better.

Thanks for reading my problem.

You should use ISO 32000-1, the official PDF standard.  When you do so, you will see that this particular aspect of the PDF (object Digest) has been removed from the language during the standardization process.

So don't bother its implementation - is not part of the PDF.

Tags: Adobe Developers

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