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compr.h
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compr.h
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/*
* JFFS2 -- Journalling Flash File System, Version 2.
*
* Copyright © 2004 Ferenc Havasi <[email protected]>,
* University of Szeged, Hungary
*
* For licensing information, see the file 'LICENCE' in this directory.
*
*/
#ifndef __JFFS2_COMPR_H__
#define __JFFS2_COMPR_H__
#include <linux/kernel.h>
#include <linux/vmalloc.h>
#include <linux/list.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/jffs2.h>
#include "jffs2_fs_i.h"
#include "jffs2_fs_sb.h"
#include "nodelist.h"
#define JFFS2_RUBINMIPS_PRIORITY 10
#define JFFS2_DYNRUBIN_PRIORITY 20
#define JFFS2_LZARI_PRIORITY 30
#define JFFS2_RTIME_PRIORITY 50
#define JFFS2_ZLIB_PRIORITY 60
#define JFFS2_LZO_PRIORITY 80
#define JFFS2_RUBINMIPS_DISABLED /* RUBINs will be used only */
#define JFFS2_DYNRUBIN_DISABLED /* for decompression */
#define JFFS2_COMPR_MODE_NONE 0
#define JFFS2_COMPR_MODE_PRIORITY 1
#define JFFS2_COMPR_MODE_SIZE 2
#define JFFS2_COMPR_MODE_FAVOURLZO 3
#define FAVOUR_LZO_PERCENT 80
struct jffs2_compressor {
struct list_head list;
int priority; /* used by prirority comr. mode */
char *name;
char compr; /* JFFS2_COMPR_XXX */
int (*compress)(unsigned char *data_in, unsigned char *cpage_out,
uint32_t *srclen, uint32_t *destlen, void *model);
int (*decompress)(unsigned char *cdata_in, unsigned char *data_out,
uint32_t cdatalen, uint32_t datalen, void *model);
int usecount;
int disabled; /* if set the compressor won't compress */
unsigned char *compr_buf; /* used by size compr. mode */
uint32_t compr_buf_size; /* used by size compr. mode */
uint32_t stat_compr_orig_size;
uint32_t stat_compr_new_size;
uint32_t stat_compr_blocks;
uint32_t stat_decompr_blocks;
};
int jffs2_register_compressor(struct jffs2_compressor *comp);
int jffs2_unregister_compressor(struct jffs2_compressor *comp);
int jffs2_compressors_init(void);
int jffs2_compressors_exit(void);
uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
unsigned char *data_in, unsigned char **cpage_out,
uint32_t *datalen, uint32_t *cdatalen);
int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
uint16_t comprtype, unsigned char *cdata_in,
unsigned char *data_out, uint32_t cdatalen, uint32_t datalen);
void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig);
/* Compressor modules */
/* These functions will be called by jffs2_compressors_init/exit */
#ifdef CONFIG_JFFS2_RUBIN
int jffs2_rubinmips_init(void);
void jffs2_rubinmips_exit(void);
int jffs2_dynrubin_init(void);
void jffs2_dynrubin_exit(void);
#endif
#ifdef CONFIG_JFFS2_RTIME
int jffs2_rtime_init(void);
void jffs2_rtime_exit(void);
#endif
#ifdef CONFIG_JFFS2_ZLIB
int jffs2_zlib_init(void);
void jffs2_zlib_exit(void);
#endif
#ifdef CONFIG_JFFS2_LZO
int jffs2_lzo_init(void);
void jffs2_lzo_exit(void);
#endif
#endif /* __JFFS2_COMPR_H__ */