Loading PDF gets stuck at READ XREF AND TABLE

[hahnrobert]

When loading this PDF via this code, the program gets stuck:
let _file = pdf::file::File::<Vec<u8>>::open("test1.pdf")?;

[Ploppz]

It seems if you try to run it a little longer, it outputs the error:

 === 
Error: Key Root: cannot convert from primitive to type Catalog
  caused by: Key StructTreeRoot: cannot convert from primitive to type Option < StructTreeRoot >
  caused by: Tried to dereference free object nr 133.
 === 

Edit: btw if anyone wonders how to get such outputs, you can use the print_err function or the provided examples/read.rs

Looking at the Catalog type, StructTreeRoot is optional. Inspecting the pdf reveals that indeed there is a reference to a non-existent/free object. So I think the best fix is to treat such references as absence of the object rather than error. Working on it.

[Ploppz]

Done and pushed to master.
Interesting to note how slow it reads the object. Should definitely be benchmarked.
When running with --release it takes 6 seconds, and without it takes 154 seconds...

[Ploppz]

When I benchmarked it, seems like most of that time is spent in error_chain. I should definitely look into that. But I should also switch to using failure. Maybe that's somehow better.

[Ploppz]

@hahnrobert I don't know if you are still interested, but it seems that with the latest rewrite, reading is much faster. On current master, run cargo run -p read -- files/ep.pdf. (That file is the one you linked in this issue) It is done in less than a second on my computer.

[s3bk]

there is also --release which should make it at least one magnitude faster