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
44#define FAVOUR_LZO_PERCENT 80
45
46struct jffs2_compressor {
47	struct list_head list;
48	int priority;			/* used by prirority comr. mode */
49	char *name;
50	char compr;			/* JFFS2_COMPR_XXX */
51	int (*compress)(unsigned char *data_in, unsigned char *cpage_out,
52			uint32_t *srclen, uint32_t *destlen, void *model);
53	int (*decompress)(unsigned char *cdata_in, unsigned char *data_out,
54			  uint32_t cdatalen, uint32_t datalen, void *model);
55	int usecount;
56	int disabled;		/* if set the compressor won't compress */
57	unsigned char *compr_buf;	/* used by size compr. mode */
58	uint32_t compr_buf_size;	/* used by size compr. mode */
59	uint32_t stat_compr_orig_size;
60	uint32_t stat_compr_new_size;
61	uint32_t stat_compr_blocks;
62	uint32_t stat_decompr_blocks;
63};
64
65int jffs2_register_compressor(struct jffs2_compressor *comp);
66int jffs2_unregister_compressor(struct jffs2_compressor *comp);
67
68int jffs2_compressors_init(void);
69int jffs2_compressors_exit(void);
70
71uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
72			unsigned char *data_in, unsigned char **cpage_out,
73			uint32_t *datalen, uint32_t *cdatalen);
74
75int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
76		     uint16_t comprtype, unsigned char *cdata_in,
77		     unsigned char *data_out, uint32_t cdatalen, uint32_t datalen);
78
79void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig);
80
81/* Compressor modules */
82/* These functions will be called by jffs2_compressors_init/exit */
83
84#ifdef CONFIG_JFFS2_RUBIN
85int jffs2_rubinmips_init(void);
86void jffs2_rubinmips_exit(void);
87int jffs2_dynrubin_init(void);
88void jffs2_dynrubin_exit(void);
89#endif
90#ifdef CONFIG_JFFS2_RTIME
91int jffs2_rtime_init(void);
92void jffs2_rtime_exit(void);
93#endif
94#ifdef CONFIG_JFFS2_ZLIB
95int jffs2_zlib_init(void);
96void jffs2_zlib_exit(void);
97#endif
98#ifdef CONFIG_JFFS2_LZO
99int jffs2_lzo_init(void);
100void jffs2_lzo_exit(void);
101#endif
102
103#endif /* __JFFS2_COMPR_H__ */
104