source: rtems/cpukit/libfs/src/jffs2/src/compr.h @ 3c96bee

4.11
Last change on this file since 3c96bee was 3c96bee, checked in by Sebastian Huber <sebastian.huber@…>, on Sep 12, 2013 at 1:32:07 PM

JFFS2: Add RTEMS support

  • Property mode set to 100644
File size: 3.0 KB
Line 
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
48struct 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
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,
74                        unsigned char *data_in, unsigned char **cpage_out,
75                        uint32_t *datalen, uint32_t *cdatalen);
76
77int 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#define jffs2_free_comprbuf(x, y) do { } while (0)
82
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
100#ifdef CONFIG_JFFS2_LZO
101int jffs2_lzo_init(void);
102void jffs2_lzo_exit(void);
103#endif
104
105#endif /* __JFFS2_COMPR_H__ */
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