Infinite loop in Page()

[splitbrain]

I have a PDF (which unfortunately I am not allowed to share) that causes an infinite loop in the Page() function.

Basically, none of the two if checks in the kid handling return true and the outer loop just keeps repeating

I'm not a go developer and have no idea about the inner workings of the PDF format, so I don't know how to address this.

Here are two screenshots from the debugger showing the state within the function:

PS I realize that this is probably a problem with the PDF, but I would prefer an error instead of an infinite loop.

[splitbrain]

@RebotPtyLtd this problem is also still present in your fork (but I can't report it there because you don't have issues enabled)

[danieldids]

I'm facing the same issue. I have a sample PDF that I can share, would it help?

lo9922023_654a7ab402fcb.pdf

Yes, the file is a single page PDF, without any text whatsoever. For my purpose, it doesn't matter, all I need is some return, even if empty.

I've located the loop to be happening at this function bellow:

// Page returns the page for the given page number.
// Page numbers are indexed starting at 1, not 0.
// If the page is not found, Page returns a Page with p.V.IsNull().
func (r *Reader) Page(num int) Page {
	num-- // now 0-indexed
	page := r.Trailer().Key("Root").Key("Pages")
Search:
	for page.Key("Type").Name() == "Pages" {
		count := int(page.Key("Count").Int64())
		if count < num {
			return Page{}
		}
		kids := page.Key("Kids")
		for i := 0; i < kids.Len(); i++ {
			kid := kids.Index(i)
			if kid.Key("Type").Name() == "Pages" {
				c := int(kid.Key("Count").Int64())
				if num < c {
					page = kid
					continue Search
				}
				num -= c
				continue
			}
			if kid.Key("Type").Name() == "Page" {
				if num == 0 {
					return Page{kid}
				}
				num--
			}
		}
	}
	return Page{}
}