linux-kernel - Re: JFFS2 using 'private' zlib header (was [RFC] LZO de/compression support

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Date:	Tue, 29 May 2007 22:31:19 -0700
From:	Mark Adler <madler@...mni.caltech.edu>
To:	Satyam Sharma <satyam.sharma@...il.com>
Cc:	"Daniel Hazelton" <dhazelton@...er.net>,
	"Michael-Luke Jones" <mlj28@....ac.uk>,
	lkml <linux-kernel@...r.kernel.org>, dwmw2@...radead.org,
	jloup@...p.org
Subject: Re: JFFS2 using 'private' zlib header (was [RFC] LZO de/compression support - take 6)

On May 29, 2007, at 8:15 AM, Satyam Sharma wrote:
> skipping some checksum calculation if some
> flag (PRESET_DICT) is absent from the input stream about to
> be decompressed ...

You don't need to dissect the header manually to look for that bit.   
If you feed inflate() at least the first two bytes, it will return  
immediately with the Z_NEED_DICT return code if a preset dictionary  
is requested.  You can force inflate() to return immediately after  
decoding the two byte header even if a preset dictionary is not  
requested by using the Z_BLOCK flush code.

Mark

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