sambitdash
AssertionError: Invalid interval
What does this error mean?
julia> pdPageExtractText(stdout, page)
ERROR: AssertionError: Invalid interval
Stacktrace:
[1] Interval
@ C:\Users\bdeon\.julia\packages\Rectangle\Imrhs\src\interval.jl:5 [inlined]
[2] Interval
@ C:\Users\bdeon\.julia\packages\Rectangle\Imrhs\src\interval.jl:20 [inlined]
[3] on_cmap_command!(stm::IOBuffer, command::Symbol, params::Vector{CosInt}, cmap::PDFIO.PD.CMap)
@ PDFIO.PD C:\Users\bdeon\.julia\packages\PDFIO\KxUq6\src\PDFonts.jl:365
[4] read_cmap(stm::IOBuffer)
@ PDFIO.PD C:\Users\bdeon\.julia\packages\PDFIO\KxUq6\src\PDFonts.jl:384
[5] get_unicode_mapping(cmap_stm::PDFIO.Cos.ID{CosStream})
@ PDFIO.PD C:\Users\bdeon\.julia\packages\PDFIO\KxUq6\src\PDFonts.jl:153
[6] get_unicode_mapping(doc::PDFIO.Cos.CosDocImpl, font::PDFIO.Cos.ID{CosDict})
@ PDFIO.PD C:\Users\bdeon\.julia\packages\PDFIO\KxUq6\src\PDFonts.jl:143
[7] PDFont
@ C:\Users\bdeon\.julia\packages\PDFIO\KxUq6\src\PDFonts.jl:411 [inlined]
[8] get_pd_font!(doc::PDFIO.PD.PDDocImpl, cosfont::PDFIO.Cos.ID{CosDict})
@ PDFIO.PD C:\Users\bdeon\.julia\packages\PDFIO\KxUq6\src\PDDocImpl.jl:112
[9] get_font(page::PDFIO.PD.PDPageImpl, fontname::CosName)
@ PDFIO.PD C:\Users\bdeon\.julia\packages\PDFIO\KxUq6\src\PDPage.jl:313
[10] evalContent!(pdo::PDPageElement{:Tf}, state::PDFIO.PD.GState{:PDFIO})
@ PDFIO.PD C:\Users\bdeon\.julia\packages\PDFIO\KxUq6\src\PDPageElement.jl:774
[11] evalContent!
@ C:\Users\bdeon\.julia\packages\PDFIO\KxUq6\src\PDPageElement.jl:657 [inlined]
[12] evalContent!(pdo::PDPageTextObject, state::PDFIO.PD.GState{:PDFIO})
@ PDFIO.PD C:\Users\bdeon\.julia\packages\PDFIO\KxUq6\src\PDPageElement.jl:719
[13] evalContent!
@ C:\Users\bdeon\.julia\packages\PDFIO\KxUq6\src\PDPageElement.jl:657 [inlined]
[14] pdPageEvalContent(page::PDFIO.PD.PDPageImpl, state::PDFIO.PD.GState{:PDFIO})
@ PDFIO.PD C:\Users\bdeon\.julia\packages\PDFIO\KxUq6\src\PDPage.jl:145
[15] pdPageEvalContent
@ C:\Users\bdeon\.julia\packages\PDFIO\KxUq6\src\PDPage.jl:144 [inlined]
[16] pdPageExtractText(io::Base.TTY, page::PDFIO.PD.PDPageImpl)
@ PDFIO.PD C:\Users\bdeon\.julia\packages\PDFIO\KxUq6\src\PDPage.jl:178
[17] top-level scope
@ REPL[10]:1
The font enconding mapping to unicode used in PDF has issues. Please share the file to investigate.
The encoding cmaps have ranges lo:hi defined in them. It seems for some reason in the mapping file you have high value lesser than low value. Hence, this assertion error.
https://github.com/sambitdash/Rectangle.jl/blob/54f36a07257b17b8bc8e1f4698aef20df90d632f/src/interval.jl#L5
A few comments:
- I printed one page of the pdf (print to pdf on windows) which was causing the error so I could post it here as an example. However, when I tried to run the extract on this 1 page example the extract worked.
- The extract doesn't correctly extract the text. The first sentence should be:
U ovoj je knjizi riječ pretežito o hobitima i iz nje će čitatelj doznati štošta o njihovu značaju i nešto malo o njihovoj povijesti.
but the extract function seems to have a problem with the accent marks. I get this:
U ovoj je knjizi rijee zna Crvene knjige o Zapadnoj pokrajini koji su ve objelodanjeni pod naslovom Hobit.
which doesn't have accent marks and skips a bunch of text.
Thoughts?
I would believe you have some issues related to the font encoding in the file. If I open the file in Adobe Reader and select and copy the text I see exactly below. Which is close to what you are observing. This happens when the font toUnicode c-maps are not properly transferred. The extract text works on the same principle of copying and pasting text from a PDF file.
1 O hobitima U ovoj je knjizi rije e zna Crvene knjige o Zapadnoj pokrajini koji su ve objelodanjeni pod naslovom Hobit.
I will need to investigate the original file with the C-Map to realize why the file does not get transmitted properly. Please share it here, if possible. If there are security concerns you can mail me at: sambitdash at gmail
@bdeonovic Sorry for my delay in looking into the file. The CMap file in the PDF is not aligned to the spec. Figure-6 in the attached spec.
That's the reason some readers behave differently. While I will try to repair the cmap for a special case, this is not the correct approach. Code space ranges are rectangular regions in the byte plane and not numbers.
/Registry (BKABIP+TT5+0) /Ordering (T42UV) /Supplement 0 >> def
/CMapName /BKABIP+TT5+0 def
/CMapType 2 def
1 begincodespacerange <00fb> <0108> endcodespacerange
2 beginbfchar
<00ff> <0111>
<0108> <0110>
endbfchar
2 beginbfrange
<00fb> <00fc> <0106>
<00fd> <00fe> <010C>
endbfrange
endcmap CMapName currentdict /CMap defineresource pop end end
is the CMap. As per the CMap spec the codespace range should have 2 elements.
2 begincodespacerange
<00fb> <00ff>
<0100> <0108>
endcodespacerange
A few comments:
- I printed one page of the pdf (print to pdf on windows) which was causing the error so I could post it here as an example. However, when I tried to run the extract on this 1 page example the extract worked.
- The extract doesn't correctly extract the text. The first sentence should be:
U ovoj je knjizi riječ pretežito o hobitima i iz nje će čitatelj doznati štošta o njihovu značaju i nešto malo o njihovoj povijesti.
but the extract function seems to have a problem with the accent marks. I get this:
U ovoj je knjizi rijee zna Crvene knjige o Zapadnoj pokrajini koji su ve objelodanjeni pod naslovom Hobit.
which doesn't have accent marks and skips a bunch of text.
Thoughts?
On Page-6 of the document you shared, I get:
U ovoj je knjizi riječ pretežito o hobitima i iz nje će čitatelj doznati štošta o njihovu
značaju i nešto malo o njihovoj povijesti.
This is what you are expecting. While I have introduced a workaround in the code, this is not the code as per spec.
https://github.com/sambitdash/PDFIO.jl/commit/9ed161f478ba4e631e9fe6d7babc91d810ceed1e fixes this now.