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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>,
ef53cb02 5 * University of Szeged, Hungary
6088c058 6 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
1da177e4 7 *
c00c310e 8 * For licensing information, see the file 'LICENCE' in this directory.
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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>
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24#include "jffs2_fs_i.h"
25#include "jffs2_fs_sb.h"
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26#include "nodelist.h"
27
28#define JFFS2_RUBINMIPS_PRIORITY 10
29#define JFFS2_DYNRUBIN_PRIORITY 20
30#define JFFS2_LZARI_PRIORITY 30
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31#define JFFS2_RTIME_PRIORITY 50
32#define JFFS2_ZLIB_PRIORITY 60
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33#define JFFS2_LZO_PRIORITY 80
34
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35
36#define JFFS2_RUBINMIPS_DISABLED /* RUBINs will be used only */
ef53cb02 37#define JFFS2_DYNRUBIN_DISABLED /* for decompression */
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38
39#define JFFS2_COMPR_MODE_NONE 0
40#define JFFS2_COMPR_MODE_PRIORITY 1
41#define JFFS2_COMPR_MODE_SIZE 2
3b23c1f5 42#define JFFS2_COMPR_MODE_FAVOURLZO 3
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43#define JFFS2_COMPR_MODE_FORCELZO 4
44#define JFFS2_COMPR_MODE_FORCEZLIB 5
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45
46#define FAVOUR_LZO_PERCENT 80
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47
48struct jffs2_compressor {
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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,
088bd455 54 uint32_t *srclen, uint32_t *destlen);
ef53cb02 55 int (*decompress)(unsigned char *cdata_in, unsigned char *data_out,
088bd455 56 uint32_t cdatalen, uint32_t datalen);
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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;
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65};
66
67int jffs2_register_compressor(struct jffs2_compressor *comp);
68int jffs2_unregister_compressor(struct jffs2_compressor *comp);
69
70int jffs2_compressors_init(void);
71int jffs2_compressors_exit(void);
72
73uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
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74 unsigned char *data_in, unsigned char **cpage_out,
75 uint32_t *datalen, uint32_t *cdatalen);
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76
77int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
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78 uint16_t comprtype, unsigned char *cdata_in,
79 unsigned char *data_out, uint32_t cdatalen, uint32_t datalen);
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80
81void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig);
82
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83/* Compressor modules */
84/* These functions will be called by jffs2_compressors_init/exit */
85
86#ifdef CONFIG_JFFS2_RUBIN
87int jffs2_rubinmips_init(void);
88void jffs2_rubinmips_exit(void);
89int jffs2_dynrubin_init(void);
90void jffs2_dynrubin_exit(void);
91#endif
92#ifdef CONFIG_JFFS2_RTIME
93int jffs2_rtime_init(void);
94void jffs2_rtime_exit(void);
95#endif
96#ifdef CONFIG_JFFS2_ZLIB
97int jffs2_zlib_init(void);
98void jffs2_zlib_exit(void);
99#endif
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100#ifdef CONFIG_JFFS2_LZO
101int jffs2_lzo_init(void);
102void jffs2_lzo_exit(void);
103#endif
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104
105#endif /* __JFFS2_COMPR_H__ */