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Re: SDK vs ZIP?
- Subject: Re: SDK vs ZIP?
- From: Andy McFadden <fadden@fadden.com>
- Date: 13 Feb 2006 04:03:03 GMT
- Newsgroups: comp.sys.apple2
- Organization: faddenInternet, Inc.
- References: <EMSHf.20308$_S7.16318@newssvr14.news.prodigy.com>
- Sender: Andy McFadden <fadden@adsl-209-204-141-120.sonic.net>
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Bryan Parkoff <none@nospam.net> wrote:
> What is the difference between SDK and ZIP compression utility? Apple
> II does have ZIP utility, but it is very slow at 1MHz. I tried to compress
> using ZIP on Apple IIgs at 7MHz so it seems running okay little faster for
> couple minutes. It seems that SDK is little faster. Why?
SDK (ShrinkIt) is using a combination of RLE and LZW. Zip is using
Deflate, which is a very different algorithm. Deflate is fairly slow
when compressing data, much faster when uncompressing.
ShrinkIt is hand-coded assembly, the Zip utility is probably C code.
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