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 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
7 *
8 * For licensing information, see the file 'LICENCE' in this directory.
9 *
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>
24 #include "jffs2_fs_i.h"
25 #include "jffs2_fs_sb.h"
26 #include "nodelist.h"
27
28 #define JFFS2_RUBINMIPS_PRIORITY 10
29 #define JFFS2_DYNRUBIN_PRIORITY 20
30 #define JFFS2_LZARI_PRIORITY 30
31 #define JFFS2_RTIME_PRIORITY 50
32 #define JFFS2_ZLIB_PRIORITY 60
33 #define JFFS2_LZO_PRIORITY 80
34
35
36 #define JFFS2_RUBINMIPS_DISABLED /* RUBINs will be used only */
37 #define JFFS2_DYNRUBIN_DISABLED /* for decompression */
38
39 #define JFFS2_COMPR_MODE_NONE 0
40 #define JFFS2_COMPR_MODE_PRIORITY 1
41 #define JFFS2_COMPR_MODE_SIZE 2
42 #define JFFS2_COMPR_MODE_FAVOURLZO 3
43 #define JFFS2_COMPR_MODE_FORCELZO 4
44 #define JFFS2_COMPR_MODE_FORCEZLIB 5
45
46 #define FAVOUR_LZO_PERCENT 80
47
48 struct jffs2_compressor {
49 struct list_head list;
50 int priority; /* used by prirority comr. mode */
51 char *name;
52 char compr; /* JFFS2_COMPR_XXX */
53 int (*compress)(unsigned char *data_in, unsigned char *cpage_out,
54 uint32_t *srclen, uint32_t *destlen);
55 int (*decompress)(unsigned char *cdata_in, unsigned char *data_out,
56 uint32_t cdatalen, uint32_t datalen);
57 int usecount;
58 int disabled; /* if set the compressor won't compress */
59 unsigned char *compr_buf; /* used by size compr. mode */
60 uint32_t compr_buf_size; /* used by size compr. mode */
61 uint32_t stat_compr_orig_size;
62 uint32_t stat_compr_new_size;
63 uint32_t stat_compr_blocks;
64 uint32_t stat_decompr_blocks;
65 };
66
67 int jffs2_register_compressor(struct jffs2_compressor *comp);
68 int jffs2_unregister_compressor(struct jffs2_compressor *comp);
69
70 int jffs2_compressors_init(void);
71 int jffs2_compressors_exit(void);
72
73 uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
74 unsigned char *data_in, unsigned char **cpage_out,
75 uint32_t *datalen, uint32_t *cdatalen);
76
77 int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
78 uint16_t comprtype, unsigned char *cdata_in,
79 unsigned char *data_out, uint32_t cdatalen, uint32_t datalen);
80
81 void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig);
82
83 /* Compressor modules */
84 /* These functions will be called by jffs2_compressors_init/exit */
85
86 #ifdef CONFIG_JFFS2_RUBIN
87 int jffs2_rubinmips_init(void);
88 void jffs2_rubinmips_exit(void);
89 int jffs2_dynrubin_init(void);
90 void jffs2_dynrubin_exit(void);
91 #else
jffs2_rubinmips_init(void)92 static inline int jffs2_rubinmips_init(void) { return 0; }
jffs2_rubinmips_exit(void)93 static inline void jffs2_rubinmips_exit(void) {}
jffs2_dynrubin_init(void)94 static inline int jffs2_dynrubin_init(void) { return 0; }
jffs2_dynrubin_exit(void)95 static inline void jffs2_dynrubin_exit(void) {}
96 #endif
97 #ifdef CONFIG_JFFS2_RTIME
98 extern int jffs2_rtime_init(void);
99 extern void jffs2_rtime_exit(void);
100 #else
jffs2_rtime_init(void)101 static inline int jffs2_rtime_init(void) { return 0; }
jffs2_rtime_exit(void)102 static inline void jffs2_rtime_exit(void) {}
103 #endif
104 #ifdef CONFIG_JFFS2_ZLIB
105 extern int jffs2_zlib_init(void);
106 extern void jffs2_zlib_exit(void);
107 #else
jffs2_zlib_init(void)108 static inline int jffs2_zlib_init(void) { return 0; }
jffs2_zlib_exit(void)109 static inline void jffs2_zlib_exit(void) {}
110 #endif
111 #ifdef CONFIG_JFFS2_LZO
112 extern int jffs2_lzo_init(void);
113 extern void jffs2_lzo_exit(void);
114 #else
jffs2_lzo_init(void)115 static inline int jffs2_lzo_init(void) { return 0; }
jffs2_lzo_exit(void)116 static inline void jffs2_lzo_exit(void) {}
117 #endif
118
119 #endif /* __JFFS2_COMPR_H__ */
120