Re: Re: Swap Compression

[Jörn Engel]

On Sat, 26 April 2003 22:24:04 -0400, rmoser wrote:
> 
> So what's the best way to do this?  I was originally thinking like this:
> 
> Grab some swap data
> Stuff it into fcomp_push()
> When you have 100k of data, seal it up
> Write that 100k block

I would like something like this:

/*	fox_compress
 *	@input: Pointer to uncompressed data
 *	@output: Pointer to buffer
 *	@inlen: Size of uncompressed data
 *	@outlen: Size of the buffer
 *
 *	Return:
 *	0 on successful compression
 *	-Esomething on error
 *
 *	Side effects:
 *	Output buffer is filled with random data after an error
 *	condition or the compressed input data on success.
 *	outlen remains unchanged on error and holds the compressed
 *	data size on success
 *
 *	If the output buffer is too small, this is an error.
 */
int fox_compress(unsigned char *input, unsigned char *output,
		uint32_t inlen, uint32_t *outlen);

/*	fox_decompress
 *	see above, basically
 */
int fox_decompress(unsigned char *input, unsigned char *output,
		uint32_t inlen, uint32_t *outlen);

Then the mm code can pick any useful size for compression.

Jörn

-- 
My second remark is that our intellectual powers are rather geared to
master static relations and that our powers to visualize processes
evolving in time are relatively poorly developed.
-- Edsger W. Dijkstra