linux/fs/jffs2/compr_rtime.c

/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright © 2001-2007 Red Hat, Inc.
 * Copyright © 2004-2010 David Woodhouse <[email protected]>
 *
 * Created by Arjan van de Ven <[email protected]>
 *
 * For licensing information, see the file 'LICENCE' in this directory.
 *
 *
 *
 * Very simple lz77-ish encoder.
 *
 * Theory of operation: Both encoder and decoder have a list of "last
 * occurrences" for every possible source-value; after sending the
 * first source-byte, the second byte indicated the "run" length of
 * matches
 *
 * The algorithm is intended to only send "whole bytes", no bit-messing.
 *
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/jffs2.h>
#include "compr.h"

/* _compress returns the compressed size, -1 if bigger */
static int jffs2_rtime_compress(unsigned char *data_in,
				unsigned char *cpage_out,
				uint32_t *sourcelen, uint32_t *dstlen)
{ … }


static int jffs2_rtime_decompress(unsigned char *data_in,
				  unsigned char *cpage_out,
				  uint32_t srclen, uint32_t destlen)
{ … }

static struct jffs2_compressor jffs2_rtime_comp = …;

int jffs2_rtime_init(void)
{ … }

void jffs2_rtime_exit(void)
{ … }