Re: Archives and magic bytes
Perhaps this is mostly a reflection on me as a programmer :-} but I found the job surprisingly tricky. No I think you're right... It's not very important for me retrieve exactly what kind of file it is, it could be just something more in my little program (an organizer that put files in the right directories using extensions of files, categories and regular expressions). A really good file identifier is this one(the author is a friend of mine): http://mark0.net/soft-trid-e.html It doesn't work with mono yet but maybe one day I'll try to use it with python... Thanks everybody -- http://mail.python.org/mailman/listinfo/python-list
Re: Archives and magic bytes
This is something I've recently thought about; perhaps you wouldn't mind some points? 1) I've been running 'file' via os.popen, and I've had trouble with it incorrectly spotting file types (Fedora Core 1). I can name a specific example where it thinks a plain text README file is HTML (despite that the configuration file for 'file' at least looks right). That makes me suspicious of its ability to spot more obscure types. (No, I haven't tried to get the latest 'file'; the days are long but they are filled with negative time and in the end I don't always get done what I should.) 2) Watch out for someone giving you, say, a bogus /bin/ls in a .zip file. You may want to look into chroot (which I believe requires you to run as root), or at least examine the output of unzip -l 3) You might also have to worry about the possibility that unpacking a bundle will fill up your disk's partition. At least for a while you hold both the bundle and the unpacked bundle. 4) Using os.popen to unpack the bundle has a lot of advantages, including that during debugging you can test the stuff from the command line and feel that you completely understand which steps are working (I think I use popen2, IIRC, and capture stderr for error messages). Perhaps this is mostly a reflection on me as a programmer :-} but I found the job surprisingly tricky. Jim -- http://mail.python.org/mailman/listinfo/python-list
Re: Archives and magic bytes
Chris Rebert (cybercobra) wrote: Have you tried the tarfile or zipfile modules? You might need to ugrade your python if you don't have them. They look pretty easy and should make this a snap. You can grab the output from the *nix file command using the new subprocess module. Good Luck - Chris === PYTHON POWERs all! All your code are belong to Python! I've got them (I'm still using python 2.3 because I use gentoo) but they are not very easy to use as they seem... I'll try again, thanks! -- http://mail.python.org/mailman/listinfo/python-list
Archives and magic bytes
Hi everybody, this is my first post but I've read already many of yours interesting posts... (sorry for my bad english) Anyway for my little project I need a module that given an archive (zip, bz2, tar ...) gives me back the archive decompressed. I looked at the modules in the library reference and used some of them, but the problem is that they all behave in a different way, and just one has a useful command for decompressing files easily, bz2. /decompress(...) decompress(data) - decompressed data Decompress data in one shot. If you want to decompress data sequentially, use an instance of BZ2Decompressor instead. / I can't get even that one working, what does it mean data? A file? Maybe I could implement myself the compression algorithm (or copy that from the modules) and implement myself compress/decompress functions, what do you think? Do you know if there is already something similar?? Another thing, I work on linux (gentoo) and I would like to use the file command to retrieve informations about type of file instead of using extensions, do you think this can be done? Thanks, and sorry if I've done some stupid questions, I'm still a python novice (but it's a great language) Andrea -- http://mail.python.org/mailman/listinfo/python-list
Re: Archives and magic bytes
Another thing, I work on linux (gentoo) and I would like to use the file command to retrieve informations about type of file instead of using extensions, do you think this can be done? this is trivial: import os os.popen(file /etc/passwd).read() '/etc/passwd: ASCII text\n' -- http://mail.python.org/mailman/listinfo/python-list
Re: Archives and magic bytes
Have you tried the tarfile or zipfile modules? You might need to ugrade your python if you don't have them. They look pretty easy and should make this a snap. You can grab the output from the *nix file command using the new subprocess module. Good Luck - Chris === PYTHON POWERs all! All your code are belong to Python! -- http://mail.python.org/mailman/listinfo/python-list
