Hi Allen,
I added the new callback interface. With the following code you can read
and write bzip2 compressed files. Adding a 7zip filter should be quite easy.
Andreas
#include <boost/iostreams/filtering_stream.hpp>
#include <boost/iostreams/filter/gzip.hpp>
#include <boost/iostreams/filter/bzip2.hpp>
namespace io = boost::iostreams;
// add our own read and write callback
SceneFileHandler::the().setReadCB(readCB);
SceneFileHandler::the().setWriteCB(writeCB);
NodePtr readCB(SceneFileType *type,
std::istream &is, const Char8* ext)
{
io::filtering_istream uncompress;
uncompress.push(io::bzip2_decompressor());
uncompress.push(is);
return type->read(uncompress, ext);
}
bool writeCB(SceneFileType *type,
const NodePtr &node, std::ostream &os,
const Char8 *ext, bool compress)
{
io::filtering_ostream compress;
compress.push(io::bzip2_compressor());
compress.push(os);
return type->write(node, compress, ext);
}
I hadn't really given much thought to using another compression library.
If OpenSG was going to add support for something beyond zlib, what about
supporting 7zip (http://www.7-zip.org)? It seems to get the best
compression ratios out there and it supports ZIP, CAV, RAR, ARJ, gzip,
bzip2, tar, cpio, rpm, and deb. (in other words it would give us a lot
of options)
I don't fully understand how the current compression stream stuff in
OpenSG works, but could someone that does comment on how hard it would
be to add support for a new type of compressed stream? Does the OpenSG
load/save system allow for arbitrary piping of file stream
modifiers/loaders or how does this work?
-Allen
Antonio Bleile wrote:
Hi Allen,
I recently ran into a similar problem. I had to
deploy an application via internet containing
a zip archive which I had to deflate on the client side
(programmatically). I found this very useful zip/unzip api:
http://www.winimage.com/zLibDll/minizip.html
I haven't used the crypting features, but I saw
that it is somehow supported. It might be
useful for you as well.
Regards,
Toni
-----Messaggio originale-----
Da: [EMAIL PROTECTED] [mailto:opensg-users-
[EMAIL PROTECTED] Per conto di Allen Bierbaum
Inviato: venerdì 11 novembre 2005 15.24
A: opensg-users
Oggetto: [Opensg-users] Encryption of loaded files
I need a simple fast way to ship data files with an application in such
a way that they can only be loaded with that application.
I know that it is possible to load gzip compressed files with OpenSG,
but has anyone ever done anything with supporting encrypted files?
I am not asking for anything too complex here, even just support for a
file stream modifier that XOR'ed a user defined key against all the
bytes coming through would work well enough for me.
-Allen
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