Root/fs/jffs2/compr.h

1/*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright © 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>,
5 * University of Szeged, Hungary
6 *
7 * For licensing information, see the file 'LICENCE' in this directory.
8 *
9 */
10
11#ifndef __JFFS2_COMPR_H__
12#define __JFFS2_COMPR_H__
13
14#include <linux/kernel.h>
15#include <linux/vmalloc.h>
16#include <linux/list.h>
17#include <linux/types.h>
18#include <linux/string.h>
19#include <linux/slab.h>
20#include <linux/errno.h>
21#include <linux/fs.h>
22#include <linux/jffs2.h>
23#include "jffs2_fs_i.h"
24#include "jffs2_fs_sb.h"
25#include "nodelist.h"
26
27#define JFFS2_RUBINMIPS_PRIORITY 10
28#define JFFS2_DYNRUBIN_PRIORITY 20
29#define JFFS2_LZARI_PRIORITY 30
30#define JFFS2_RTIME_PRIORITY 50
31#define JFFS2_ZLIB_PRIORITY 60
32#define JFFS2_LZO_PRIORITY 80
33
34
35#define JFFS2_RUBINMIPS_DISABLED /* RUBINs will be used only */
36#define JFFS2_DYNRUBIN_DISABLED /* for decompression */
37
38#define JFFS2_COMPR_MODE_NONE 0
39#define JFFS2_COMPR_MODE_PRIORITY 1
40#define JFFS2_COMPR_MODE_SIZE 2
41#define JFFS2_COMPR_MODE_FAVOURLZO 3
42
43#define FAVOUR_LZO_PERCENT 80
44
45struct jffs2_compressor {
46    struct list_head list;
47    int priority; /* used by prirority comr. mode */
48    char *name;
49    char compr; /* JFFS2_COMPR_XXX */
50    int (*compress)(unsigned char *data_in, unsigned char *cpage_out,
51            uint32_t *srclen, uint32_t *destlen, void *model);
52    int (*decompress)(unsigned char *cdata_in, unsigned char *data_out,
53              uint32_t cdatalen, uint32_t datalen, void *model);
54    int usecount;
55    int disabled; /* if set the compressor won't compress */
56    unsigned char *compr_buf; /* used by size compr. mode */
57    uint32_t compr_buf_size; /* used by size compr. mode */
58    uint32_t stat_compr_orig_size;
59    uint32_t stat_compr_new_size;
60    uint32_t stat_compr_blocks;
61    uint32_t stat_decompr_blocks;
62};
63
64int jffs2_register_compressor(struct jffs2_compressor *comp);
65int jffs2_unregister_compressor(struct jffs2_compressor *comp);
66
67int jffs2_compressors_init(void);
68int jffs2_compressors_exit(void);
69
70uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
71            unsigned char *data_in, unsigned char **cpage_out,
72            uint32_t *datalen, uint32_t *cdatalen);
73
74int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
75             uint16_t comprtype, unsigned char *cdata_in,
76             unsigned char *data_out, uint32_t cdatalen, uint32_t datalen);
77
78void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig);
79
80/* Compressor modules */
81/* These functions will be called by jffs2_compressors_init/exit */
82
83#ifdef CONFIG_JFFS2_RUBIN
84int jffs2_rubinmips_init(void);
85void jffs2_rubinmips_exit(void);
86int jffs2_dynrubin_init(void);
87void jffs2_dynrubin_exit(void);
88#endif
89#ifdef CONFIG_JFFS2_RTIME
90int jffs2_rtime_init(void);
91void jffs2_rtime_exit(void);
92#endif
93#ifdef CONFIG_JFFS2_ZLIB
94int jffs2_zlib_init(void);
95void jffs2_zlib_exit(void);
96#endif
97#ifdef CONFIG_JFFS2_LZO
98int jffs2_lzo_init(void);
99void jffs2_lzo_exit(void);
100#endif
101
102#endif /* __JFFS2_COMPR_H__ */
103

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