Re: Compression...
Re: Compression...
- Subject: Re: Compression...
- From: Tim Hewett <email@hidden>
- Date: Sat, 6 Mar 2004 00:09:15 +0000
There was an OS X update which brought in compression which
used Altivec - I think it was one of the later 10.2.x updates. I
remember
afterwards that creating compressed .dmg images using Disk Copy
suddenly was much faster than before, but tools like bzip etc were
unchanged.
I've not found an API definition yet... Anyone know more?
Tim.
On 4 Mar 2004, at 00:44, email@hidden wrote:
On Mar 3, 2004, at 2:47 PM, Wade Tregaskis wrote:
The other suggestion put forward - to use zlib - is okay, but doesn't
offer very good compression. The advantage is that the library is
installed by default on all Mac OS X systems, so you won't have to
worry about that aspect. Personally I'd rather just statically link
against the bzip2 library, but perhaps your preference differs.
If you're writing a real-time application, zlib is much, much faster
than bzip2. Otherwise, I agree, bzip2 is a really good compressor.
Has anyone had any experience with 7zip/LZMA? (http://www.7-zip.org/)
It looks Windows-centric and I have no first-hand experience with it,
but it's open-source and their published statistics seem very good.
(I wrote drag-and-drop bzip2 and gz compressors for classic Mac OS, of
course just piggybacking on the zlib and the bzip2 libraries.
Sadly I don't have the free time to write drag-and-drop compression
programs in my spare time any more ;) )
_______________________________________________
cocoa-dev mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/cocoa-dev
Do not post admin requests to the list. They will be ignored.