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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
David Woodhousec00c3102007-04-25 14:16:47 +01004 * Copyright © 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>,
David Woodhouseef53cb02007-07-10 10:01:22 +01005 * University of Szeged, Hungary
David Woodhouse6088c052010-08-08 14:15:22 +01006 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
David Woodhousec00c3102007-04-25 14:16:47 +01008 * For licensing information, see the file 'LICENCE' in this directory.
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 *
10 */
11
12#ifndef __JFFS2_COMPR_H__
13#define __JFFS2_COMPR_H__
14
15#include <linux/kernel.h>
16#include <linux/vmalloc.h>
17#include <linux/list.h>
18#include <linux/types.h>
19#include <linux/string.h>
20#include <linux/slab.h>
21#include <linux/errno.h>
22#include <linux/fs.h>
23#include <linux/jffs2.h>
David Woodhousecbb9a562006-05-03 13:07:27 +010024#include "jffs2_fs_i.h"
25#include "jffs2_fs_sb.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include "nodelist.h"
27
28#define JFFS2_RUBINMIPS_PRIORITY 10
29#define JFFS2_DYNRUBIN_PRIORITY 20
30#define JFFS2_LZARI_PRIORITY 30
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#define JFFS2_RTIME_PRIORITY 50
32#define JFFS2_ZLIB_PRIORITY 60
Richard Purdiec799aca2007-07-10 10:28:36 +010033#define JFFS2_LZO_PRIORITY 80
34
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36#define JFFS2_RUBINMIPS_DISABLED /* RUBINs will be used only */
David Woodhouseef53cb02007-07-10 10:01:22 +010037#define JFFS2_DYNRUBIN_DISABLED /* for decompression */
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#define JFFS2_COMPR_MODE_NONE 0
40#define JFFS2_COMPR_MODE_PRIORITY 1
41#define JFFS2_COMPR_MODE_SIZE 2
Richard Purdie3b23c1f2007-07-10 10:28:42 +010042#define JFFS2_COMPR_MODE_FAVOURLZO 3
43
44#define FAVOUR_LZO_PERCENT 80
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
46struct jffs2_compressor {
David Woodhouseef53cb02007-07-10 10:01:22 +010047 struct list_head list;
48 int priority; /* used by prirority comr. mode */
49 char *name;
50 char compr; /* JFFS2_COMPR_XXX */
51 int (*compress)(unsigned char *data_in, unsigned char *cpage_out,
52 uint32_t *srclen, uint32_t *destlen, void *model);
53 int (*decompress)(unsigned char *cdata_in, unsigned char *data_out,
54 uint32_t cdatalen, uint32_t datalen, void *model);
55 int usecount;
56 int disabled; /* if set the compressor won't compress */
57 unsigned char *compr_buf; /* used by size compr. mode */
58 uint32_t compr_buf_size; /* used by size compr. mode */
59 uint32_t stat_compr_orig_size;
60 uint32_t stat_compr_new_size;
61 uint32_t stat_compr_blocks;
62 uint32_t stat_decompr_blocks;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063};
64
65int jffs2_register_compressor(struct jffs2_compressor *comp);
66int jffs2_unregister_compressor(struct jffs2_compressor *comp);
67
68int jffs2_compressors_init(void);
69int jffs2_compressors_exit(void);
70
71uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
David Woodhouseef53cb02007-07-10 10:01:22 +010072 unsigned char *data_in, unsigned char **cpage_out,
73 uint32_t *datalen, uint32_t *cdatalen);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
75int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
David Woodhouseef53cb02007-07-10 10:01:22 +010076 uint16_t comprtype, unsigned char *cdata_in,
77 unsigned char *data_out, uint32_t cdatalen, uint32_t datalen);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
79void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig);
80
Linus Torvalds1da177e2005-04-16 15:20:36 -070081/* Compressor modules */
82/* These functions will be called by jffs2_compressors_init/exit */
83
84#ifdef CONFIG_JFFS2_RUBIN
85int jffs2_rubinmips_init(void);
86void jffs2_rubinmips_exit(void);
87int jffs2_dynrubin_init(void);
88void jffs2_dynrubin_exit(void);
89#endif
90#ifdef CONFIG_JFFS2_RTIME
91int jffs2_rtime_init(void);
92void jffs2_rtime_exit(void);
93#endif
94#ifdef CONFIG_JFFS2_ZLIB
95int jffs2_zlib_init(void);
96void jffs2_zlib_exit(void);
97#endif
David Woodhouse0fc72b82007-07-11 15:33:14 +010098#ifdef CONFIG_JFFS2_LZO
99int jffs2_lzo_init(void);
100void jffs2_lzo_exit(void);
101#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
103#endif /* __JFFS2_COMPR_H__ */