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1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
4 | * Copyright (C) 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>, | |
5 | * University of Szeged, Hungary | |
6 | * | |
7 | * For licensing information, see the file 'LICENCE' in the | |
8 | * jffs2 directory. | |
9 | * | |
2227c0ba | 10 | * $Id: compr.h,v 1.8 2005/07/26 13:24:40 havasi Exp $ |
1da177e4 LT |
11 | * |
12 | */ | |
13 | ||
14 | #ifndef __JFFS2_COMPR_H__ | |
15 | #define __JFFS2_COMPR_H__ | |
16 | ||
17 | #include <linux/kernel.h> | |
18 | #include <linux/vmalloc.h> | |
19 | #include <linux/list.h> | |
20 | #include <linux/types.h> | |
21 | #include <linux/string.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/fs.h> | |
25 | #include <linux/jffs2.h> | |
26 | #include <linux/jffs2_fs_i.h> | |
27 | #include <linux/jffs2_fs_sb.h> | |
28 | #include "nodelist.h" | |
29 | ||
30 | #define JFFS2_RUBINMIPS_PRIORITY 10 | |
31 | #define JFFS2_DYNRUBIN_PRIORITY 20 | |
32 | #define JFFS2_LZARI_PRIORITY 30 | |
33 | #define JFFS2_LZO_PRIORITY 40 | |
34 | #define JFFS2_RTIME_PRIORITY 50 | |
35 | #define JFFS2_ZLIB_PRIORITY 60 | |
36 | ||
37 | #define JFFS2_RUBINMIPS_DISABLED /* RUBINs will be used only */ | |
38 | #define JFFS2_DYNRUBIN_DISABLED /* for decompression */ | |
39 | ||
40 | #define JFFS2_COMPR_MODE_NONE 0 | |
41 | #define JFFS2_COMPR_MODE_PRIORITY 1 | |
42 | #define JFFS2_COMPR_MODE_SIZE 2 | |
43 | ||
44 | struct jffs2_compressor { | |
45 | struct list_head list; | |
46 | int priority; /* used by prirority comr. mode */ | |
47 | char *name; | |
48 | char compr; /* JFFS2_COMPR_XXX */ | |
49 | int (*compress)(unsigned char *data_in, unsigned char *cpage_out, | |
50 | uint32_t *srclen, uint32_t *destlen, void *model); | |
51 | int (*decompress)(unsigned char *cdata_in, unsigned char *data_out, | |
52 | uint32_t cdatalen, uint32_t datalen, void *model); | |
53 | int usecount; | |
54 | int disabled; /* if seted the compressor won't compress */ | |
55 | unsigned char *compr_buf; /* used by size compr. mode */ | |
56 | uint32_t compr_buf_size; /* used by size compr. mode */ | |
57 | uint32_t stat_compr_orig_size; | |
58 | uint32_t stat_compr_new_size; | |
59 | uint32_t stat_compr_blocks; | |
60 | uint32_t stat_decompr_blocks; | |
61 | }; | |
62 | ||
63 | int jffs2_register_compressor(struct jffs2_compressor *comp); | |
64 | int jffs2_unregister_compressor(struct jffs2_compressor *comp); | |
65 | ||
66 | int jffs2_compressors_init(void); | |
67 | int jffs2_compressors_exit(void); | |
68 | ||
69 | uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f, | |
70 | unsigned char *data_in, unsigned char **cpage_out, | |
71 | uint32_t *datalen, uint32_t *cdatalen); | |
72 | ||
73 | int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f, | |
74 | uint16_t comprtype, unsigned char *cdata_in, | |
75 | unsigned char *data_out, uint32_t cdatalen, uint32_t datalen); | |
76 | ||
77 | void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig); | |
78 | ||
79 | #ifdef CONFIG_JFFS2_PROC | |
80 | int jffs2_enable_compressor_name(const char *name); | |
81 | int jffs2_disable_compressor_name(const char *name); | |
82 | int jffs2_set_compression_mode_name(const char *mode_name); | |
83 | char *jffs2_get_compression_mode_name(void); | |
84 | int jffs2_set_compressor_priority(const char *mode_name, int priority); | |
85 | char *jffs2_list_compressors(void); | |
86 | char *jffs2_stats(void); | |
87 | #endif | |
88 | ||
89 | /* Compressor modules */ | |
90 | /* These functions will be called by jffs2_compressors_init/exit */ | |
91 | ||
92 | #ifdef CONFIG_JFFS2_RUBIN | |
93 | int jffs2_rubinmips_init(void); | |
94 | void jffs2_rubinmips_exit(void); | |
95 | int jffs2_dynrubin_init(void); | |
96 | void jffs2_dynrubin_exit(void); | |
97 | #endif | |
98 | #ifdef CONFIG_JFFS2_RTIME | |
99 | int jffs2_rtime_init(void); | |
100 | void jffs2_rtime_exit(void); | |
101 | #endif | |
102 | #ifdef CONFIG_JFFS2_ZLIB | |
103 | int jffs2_zlib_init(void); | |
104 | void jffs2_zlib_exit(void); | |
105 | #endif | |
1da177e4 LT |
106 | |
107 | #endif /* __JFFS2_COMPR_H__ */ |