Re: [Vala] Binding 7zip library ?

[raum no-log org]

I think it's running. I've compressed test.vala into test.7z then :

$  valac --pkg libarchive test.vala

$ ./test.exe
version libarchive 3.1.2
test.vala

Well, now I'll test files decompression :)

Raum

> Sorry, I've sent the wrong vapi file. Please find in attachement the
> correct files.
>
> Regards
>
> Raum
>
>
> > I'm not sure but a compatible version 3 libarchive.vapi should be
> > similar
> > to these files in attachement.
> >
> > Am I correct ?
> >
> > Indeed I need to read 7zip, not write a 7zip archive. :)
> >
> > Thanks for all informations you provided me ;)
> >
> > Regards,
> >
> > Raum
> >
> > > On Tue, 2013-08-27 at 08:46 +0200, raum no-log org wrote:
> > > > I had a look to libarchive... It seems libarchive 3.0 could handle
> > > > 7Zip
> > > > format (for reading) but unfortunately there is only a vapi file for
> > > > version 2...
> > > >
> > > > I've read some pages about "how to generate vapi" but I didnt
> > > > success...
> > > >
> > > > Should I try to write by hand a vapi file ?
> > >
> > > libarchive is not GObject-based, so it's not possible to generate a
> > > vapi
> > > automatically.  Writing it by hand is your only option.
> > >
> > > libarchive 3 is compatible with previous versions, so there is no need
> > > to create a new VAPI.  Just add what you need to the existing bindings.
> > >
> > > > Thanks
> > > >
> > > > > On Mon, 2013-08-26 at 11:27 +0200, raum no-log org wrote:
> > > > > > Hello,
> > > > > >
> > > > > > I've downloaded and build 7Zip library and I've these files
> > > > compiled
> > > > > > (under Windows using MingW32, with prefix /opt) :
> > > > > >
> > > > > > /src/lib7zip-1.6.5/Lib7Zip/lib7zip.a
> > > > > > /src/lib7zip-1.6.5/Lib7Zip/lib7zip.dll
> > > > > > /src/lib7zip-1.6.5/Lib7Zip/lib7zip.h
> > > > > >
> > > > > > "make install" command didn't copy these files under /opt/bin,
> > > > > > /opt/include, /opt/library
> > > > >
> > > > > The 7zip SDK really designed to be embedded within your project, not
> > > > > used as a shared library.
> > > > >
> > > > > > I've copied manually in the correct directory but tests programs
> > > > output
> > > > > > :
> > > > > > # test7zip.exe
> > > > > > initialize fail!
> > > > > >
> > > > > > So I think I've made a mistake somewhere... But how to test it with
> > > > a
> > > > > > vala
> > > > > > test program ? I need to build a vapi file ? something like that ?
> > > > >
> > > > > Yes, you would need to create VAPI.  I looked at the 7zip SDK API
> > > > quite
> > > > > recently and I don't think creating a VAPI would be an easy task.
> > > > The
> > > > > API is a bit of a mess.
> > > > >
> > > > > I'm not sure what your use case is.  If you need to read and write
> > > > *.7z
> > > > > files you might want to look at libarchive?I'm not sure whether they
> > > > > support 7zip or not, but if they do then it would be a much easier
> > > > way
> > > > > to go since it already has a VAPI.
> > > > >
> > > > > If you just want to compress stuff you might want to take a look at
> > > > a
> > > > > project I've been working on called Squash [1], which does have Vala
> > > > > bindings.  It is an abstraction layer for compression libraries (not
> > > > > archivers?that's what libarchive is for), and it supports most of
> > > > the
> > > > > algorithms 7zip uses.
> > > > >
> > > > > I do plan to write a Squash plugin for the 7zip SDK eventually [2],
> > > > and
> > > > > if you really need PPMD, BCJ, or BCJ2 (Squash already supports LZMA,
> > > > > LZMA2, bzip2, and DEFLATE) I can take a look at that sooner rather
> > > > than
> > > > > later, but keep in mind that it will not support *.7z archives.
> > > > >
> > > > > Also, if you're not tied to 7zip, you may want to look at FreeArc
> > > > [3].
> > > > > I don't remember if they have an API you could use or not, but the
> > > > PPM
> > > > > compression is better, and the other algorithms are great [4].  Or,
> > > > if
> > > > > all you care about is compression ratio, ZPAQ [5] (for which there
> > > > is
> > > > a
> > > > > Squash plugin) is amazing.
> > > > >
> > > > >
> > > > > -Evan
> > > > >
> > > > > [1] http://quixdb.github.io/squash/
> > > > > [2] https://github.com/quixdb/squash/issues/31
> > > > > [3] http://freearc.org/
> > > > > [4] http://compressionratings.com/i_freearc.html
> > > > > [5] http://mattmahoney.net/dc/zpaq.html
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Attachment: test.vala
Description: Binary data