The answer to my question can be found in the reference document Section
F.2:
Linearized Parameter L - The length of the entire files in bytes. This
must be exactly equal to the actual length of the PDF file.
Reading the manual works XD
Thomas
On 6/18/21 11:40 AM, [email protected] wrote:
Progress! :)
I now know what a linearized PDF is and I found the code.
class Dokument -> DokumentData -> PDFDoc -> isLinearized() ->
Linearization -> Parser -> Lexer -> Object
Here is my question:
In function isLinearized() PDFDoc.cc line 731 from poppler 21.06.0
getLinearization()->getLength() == str->getLength()
It test if length given bei \L in the PDF document equals the PDF file
size. It is 1830148 in both cases for my test file. But why is this a
reason for a linearized PDF?
The PDF could be linearized and corrupt so the sized are not equal.
Yes, I read a few more lines and if variable "tryingToReconstruct" is
true, only the \L size is tested. Im not familiar with this concept.
Thomas
On 6/13/21 11:51 AM, [email protected] wrote:
Hello,
I always wonder why it takes so long to display big pictures in PDF
files on linux. So I recompile poppler with release+debug symbols and
use valgrind profile to get an idea what is happening there. As I can
see, 50% of the CPU ticks are used to copy data from A to B. But without
knowing the code, its hard to say if this is good or not.
So I start reading the code. Puh it's hard to understand, so I start
reading the PDF reference too.
As far I can see, there a linearized PDFs and and a table called xref.
Not much for one week of reading ;)
Perhaps I should start from scratch and write my own PDF reader to
understand things better.
If you are interested in, I can inform you about my progress. I'll do
this in my free time, so no hurry.
Thomas H.
_______________________________________________
poppler mailing list
[email protected]
https://lists.freedesktop.org/mailman/listinfo/poppler
_______________________________________________
poppler mailing list
[email protected]
https://lists.freedesktop.org/mailman/listinfo/poppler
_______________________________________________
poppler mailing list
[email protected]
https://lists.freedesktop.org/mailman/listinfo/poppler
