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1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
c00c310e | 4 | * Copyright © 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>, |
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5 | * University of Szeged, Hungary |
6 | * | |
c00c310e | 7 | * For licensing information, see the file 'LICENCE' in this directory. |
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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> | |
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23 | #include "jffs2_fs_i.h" |
24 | #include "jffs2_fs_sb.h" | |
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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_LZO_PRIORITY 40 | |
31 | #define JFFS2_RTIME_PRIORITY 50 | |
32 | #define JFFS2_ZLIB_PRIORITY 60 | |
33 | ||
34 | #define JFFS2_RUBINMIPS_DISABLED /* RUBINs will be used only */ | |
35 | #define JFFS2_DYNRUBIN_DISABLED /* for decompression */ | |
36 | ||
37 | #define JFFS2_COMPR_MODE_NONE 0 | |
38 | #define JFFS2_COMPR_MODE_PRIORITY 1 | |
39 | #define JFFS2_COMPR_MODE_SIZE 2 | |
40 | ||
41 | struct jffs2_compressor { | |
42 | struct list_head list; | |
43 | int priority; /* used by prirority comr. mode */ | |
44 | char *name; | |
45 | char compr; /* JFFS2_COMPR_XXX */ | |
46 | int (*compress)(unsigned char *data_in, unsigned char *cpage_out, | |
47 | uint32_t *srclen, uint32_t *destlen, void *model); | |
48 | int (*decompress)(unsigned char *cdata_in, unsigned char *data_out, | |
49 | uint32_t cdatalen, uint32_t datalen, void *model); | |
50 | int usecount; | |
51 | int disabled; /* if seted the compressor won't compress */ | |
52 | unsigned char *compr_buf; /* used by size compr. mode */ | |
53 | uint32_t compr_buf_size; /* used by size compr. mode */ | |
54 | uint32_t stat_compr_orig_size; | |
55 | uint32_t stat_compr_new_size; | |
56 | uint32_t stat_compr_blocks; | |
57 | uint32_t stat_decompr_blocks; | |
58 | }; | |
59 | ||
60 | int jffs2_register_compressor(struct jffs2_compressor *comp); | |
61 | int jffs2_unregister_compressor(struct jffs2_compressor *comp); | |
62 | ||
63 | int jffs2_compressors_init(void); | |
64 | int jffs2_compressors_exit(void); | |
65 | ||
66 | uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f, | |
67 | unsigned char *data_in, unsigned char **cpage_out, | |
68 | uint32_t *datalen, uint32_t *cdatalen); | |
69 | ||
70 | int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f, | |
71 | uint16_t comprtype, unsigned char *cdata_in, | |
72 | unsigned char *data_out, uint32_t cdatalen, uint32_t datalen); | |
73 | ||
74 | void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig); | |
75 | ||
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76 | /* Compressor modules */ |
77 | /* These functions will be called by jffs2_compressors_init/exit */ | |
78 | ||
79 | #ifdef CONFIG_JFFS2_RUBIN | |
80 | int jffs2_rubinmips_init(void); | |
81 | void jffs2_rubinmips_exit(void); | |
82 | int jffs2_dynrubin_init(void); | |
83 | void jffs2_dynrubin_exit(void); | |
84 | #endif | |
85 | #ifdef CONFIG_JFFS2_RTIME | |
86 | int jffs2_rtime_init(void); | |
87 | void jffs2_rtime_exit(void); | |
88 | #endif | |
89 | #ifdef CONFIG_JFFS2_ZLIB | |
90 | int jffs2_zlib_init(void); | |
91 | void jffs2_zlib_exit(void); | |
92 | #endif | |
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93 | |
94 | #endif /* __JFFS2_COMPR_H__ */ |