Re: [libextractor] libextractor-0.5.17 (win32) - extract.exe stops with error msg

[Nils Durner]

Hi,

> ok, i have downloaded it from
> http://gnuwin32.sourceforge.net/packages/autoconf.htm
I use the one from mingw.org...

> btw. how does the thumbnail extractor work? Does it read the files
> (exif) metadata and use the small resolution jpg thumbnail stored in
> e.g. jpeg files? Or does it read the whole image file (stream) and
> generate a thumbnail from that data?
Right, the whole image is resized using GTK/Qt image manipulation functions.

> Neither Qt nor GTK are reasonable for ReactOS source tree, I will
> probably write my own lib which generates thumbnails using freeimage
> lib API functions.
If it works with broken files (doesn't crash), this might be something
we're interested in.

> Does LE support also file streams (e.g. to read files inside archives)?
No, LE's frontend is C only.
Data is read from files or memory addresses (which may be mmap'ed).


I think Christian Grothoff is the right person to answer your thoughts
on PDF.


Best,

Nils Durner


> In the LE mailing list archive, I have read that LE don't come with
> extended inbuild pdf support anymore, due security issues related to
> xpdf.
> Are the xpdf issues still valid? pdftotext (poppler) and pdfinfo
> (xpdf) would be really handy.
>
> Version 3.02 (2007-02-27) of xpdf has fixed several security holes and
> it does now support PDF 1.6 and PDF 1.7 :-)
>
> There have been a lot of changes and improvements since v. 3.01
> (2005-08-17), so it might be a good idea (if not already done) to
> review the latest version.
>
> With current LE's pdf lib (based on PDFDoc), I can only extract a
> handful of metadata but not text-content and other metadata.
>
> e.g.
> creation date - 20051005173339+02'00'
> producer - OpenOffice.org 1.9.79
> format - PDF 1,0
> mimetype - application/pdf
>
> ... btw. the pdf format version is 1.4 (and not 1.0) in that example
> case, as Adobe Acrobat 8 told me. I have used "extract.exe -ad 2.pdf >
> 2.pdf.txt" to extract the metadata using libextractor-0.5.18.zip
> (win32 binary official package).
>
> Currently, pdf support is a minor priority for me; although in about
> one year, it might get important feature, as both my code and ReactOS
> itself get more matured.
>
>
> Thanks for your responses so far.
>
>
> Best regards,
> Klemens Friedl
>
>