Re: [pclasses-devel] adding zlib/bzip streams support

[stephan b. <st...@s1...>]

On Saturday 01 January 2005 18:21, Christian Prochnow wrote:
> > For reading files we can auto-determine the decompression technique
> > based on the first few bytes (i don't yet know how to dispatch this
> > type of logic via a factory, though).
>
> this could be transparently done by IODevice::read(). But IODevice
> must then know all IOFilter's.

If we could come up with a factory-like approach which works for all 
existing compression formats i think we could do it generically. e.g., 
grab the first 6 bytes of any stream and pass them to to 
Factory<IOStream>::create(). If it can load a factory with that cookie, 
great. That means using binary strings as cookies, but this doesn't 
inherently pose a problem for std::string keys.


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