Read a PDF file without knowing the size of stream

Hello

while I am able to properly read a PDF file, the only way I can do it (in function
on what I heard in the master PDF 1.7) is to go the end of the stream and
start from here (section 7.5.5).

But this requires the size of the stream to be known. While this is usually not a
problem (since the flow is usually a simple file), I would like to make my
a bit more generic and be able to manage any type of flow, as library
as long as it is placed at the beginning of a PDF document.

But unless I missed something of the form, when I'm dealing with a
unknown flow (a person who could not yet be fully charged when I started
reading, as an outlet), it is not how to do it. I mean, I could do it,
but I don't would not be able to tell when I arrived at the end of the document. Not
without some sort of length information (because I do not know where the stream)
ends). I mean, where to stop? In a trailer? That works only if the
document have never been updated.

If, just after the header (%) PDF - he was a kind of meta-information on
the size of the document (after all the updates, if any) I could move the stream to
that post (wait for the data arriving, if necessary) and work my way of
He (and from there, because I would like to know where the document ends). But since my
understand, there is no way to retrieve such information.

So, to sum up, in order to properly read a PDF document:
-I always need to know the size of stream (which I might not be able to)
-the data flow must end with the PDF data (which could be also not always true)

Am I wrong?

Unless the file has been established for "fast web view" (aka linearization - ISO 32000-1, Appendix F) Yes.

BUT, if a file be linearized so that it can be better managed in flow (at least for some parts of the PDF file).  It is not supported to pure stream - which is not possible - but it will help.

Tags: Adobe Developers

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