Re: How to decompress file
Re: How to decompress file
- Subject: Re: How to decompress file
- From: David Chan <email@hidden>
- Date: Mon, 23 Jan 2006 16:00:19 +0800
Yup the previous application was using Power Plant X. The
DecompressionStream was using zlib to decompress the file. I wanted to
use NSData instead of datafork for my cocoa application but I couldn't
exactly find a way of using zlib to decompress NSData.
On 1/20/06, Uli Kusterer <email@hidden> wrote:
> Am 19.01.2006 um 08:31 schrieb David Chan:
> > I am currently given task to rewrite a carbon project (c++) using
> > cocoa (obj-c)
>
> Are you using any framework for some of your work?
>
> > The legacy application I am working with is used to read a special
> > type of compressed file. At the moment the carbon applicaiton use
> > datafork to read the data and CDecompressionStream to decompress the
> > data.
>
> Is CDecompressionStream one of your classes? It's not Carbon or
> Classic Mac Toolbox. It sounds more like a PowerPlant class. Is the
> original using Metrowerks' PowerPlant? PowerPlant X?
>
> > How do you do that in cocoa? How do you decompress an NSData of a
> > compressed file?
>
> You can just get the NSData's -bytes accessor to get a pointer to
> the raw data. Then build an uncompressed version into an NSMutableData.
>
> You can also directly work with the files in Cocoa (see
> NSFileHandle), but the compression code you have to provide yourself.
> Shouldn't be hard to port that over, though.
>
> Cheers,
> -- M. Uli Kusterer
> http://www.zathras.de
>
>
>
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