Re: [RFH] zlib gurus out there?

[Linus Torvalds <torvalds@osdl.org>]

On Tue, 7 Mar 2006, Junio C Hamano wrote:
> >
> > No, I don't think that's good. You're only doing a partial deflate, you 
> > can't ask for a Z_FULL_FLUSH. That only works if you give it the whole 
> > buffer, and you don't.

Actually, I misread what you were trying to do, and thought this was the 
inflate phase, not the deflate. Now that I understand what you want, 

> So, in short there is no way to create:
> 
>     hdr part deflated.
>     flush.
>     data part deflated independently.
> 
> and have the current sha1_read_file() not to notice that flush,

Actually, try the patch you already tried, except you'll need to add a 

	deflateEnd(&stream);
	deflateInit(&stream, Z_BEST_COMPRESSION);
	.. set up output parameters again ..

and you need to change the initial 

	size = deflateBound(&stream, len+hdrlen);

to

	size = deflateBound(&stream, len) + deflateBound(&stream, hdrlen);

and then you might be ok.

That said, I'm not sure I agree with what you're trying to do. 

		Linus