Hi Allen,
for OpenSG 2.0 I would like to add the boost iostreams library
http://www.boost.org/libs/iostreams/doc/index.html
With this library it is really easy to add different compression or
encryption filters.
#include <boost/iostreams/device/file_descriptor.hpp>
#include <boost/iostreams/filtering_stream.hpp>
namespace io = boost::iostreams;
int main()
{
io::filtering_ostream out;
out.push(compressor());
out.push(base64_encoder());
out.push(file_sink("my_file.txt"));
// write to out using std::ostream interface
}
------
#include <boost/iostreams/device/file.hpp>
#include <boost/iostreams/filtering_stream.hpp>
namespace io = boost::iostreams;
int main()
{
io::filtering_istream in;
in.push(decompressor());
in.push(base64_decoder());
in.push(file_source("my_file.txt"));
// read from in using std::istream interface
}
In OpenSG 1.6.0 the gzip stream is hardcoded so extending this is not
easy. But I think I will add a read and write callback into the
SceneFileHandler class.
void setReadCB(readcbfp fp);
void setWriteCB(writecbfp fp);
If you set this callback functions you can implement your own reading
and writing stuff for example using the boost iostream lib.
Andreas
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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-------------------------------------------------------
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Tame your development challenges with Apache's Geronimo App Server. Download
it for free - -and be entered to win a 42" plasma tv or your very own
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