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
45 struct 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
64 int jffs2_register_compressor(struct jffs2_compressor *comp);
65 int jffs2_unregister_compressor(struct jffs2_compressor *comp);
66
67 int jffs2_compressors_init(void);
68 int jffs2_compressors_exit(void);
69
70 uint16_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
74 int 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
78 void 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
84 int jffs2_rubinmips_init(void);
85 void jffs2_rubinmips_exit(void);
86 int jffs2_dynrubin_init(void);
87 void jffs2_dynrubin_exit(void);
88 #endif
89 #ifdef CONFIG_JFFS2_RTIME
90 int jffs2_rtime_init(void);
91 void jffs2_rtime_exit(void);
92 #endif
93 #ifdef CONFIG_JFFS2_ZLIB
94 int jffs2_zlib_init(void);
95 void jffs2_zlib_exit(void);
96 #endif
97 #ifdef CONFIG_JFFS2_LZO
98 int jffs2_lzo_init(void);
99 void jffs2_lzo_exit(void);
100 #endif
101
102 #endif /* __JFFS2_COMPR_H__ */
103
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