2 * JFFS2 -- Journalling Flash File System, Version 2.
4 * Copyright © 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>,
5 * University of Szeged, Hungary
7 * For licensing information, see the file 'LICENCE' in this directory.
11 #ifndef __JFFS2_COMPR_H__
12 #define __JFFS2_COMPR_H__
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>
22 #include <linux/jffs2.h>
23 #include "jffs2_fs_i.h"
24 #include "jffs2_fs_sb.h"
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
34 #define JFFS2_RUBINMIPS_DISABLED /* RUBINs will be used only */
35 #define JFFS2_DYNRUBIN_DISABLED /* for decompression */
37 #define JFFS2_COMPR_MODE_NONE 0
38 #define JFFS2_COMPR_MODE_PRIORITY 1
39 #define JFFS2_COMPR_MODE_SIZE 2
41 struct jffs2_compressor {
42 struct list_head list;
43 int priority; /* used by prirority comr. mode */
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);
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;
60 int jffs2_register_compressor(struct jffs2_compressor *comp);
61 int jffs2_unregister_compressor(struct jffs2_compressor *comp);
63 int jffs2_compressors_init(void);
64 int jffs2_compressors_exit(void);
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);
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);
74 void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig);
76 /* Compressor modules */
77 /* These functions will be called by jffs2_compressors_init/exit */
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);
85 #ifdef CONFIG_JFFS2_RTIME
86 int jffs2_rtime_init(void);
87 void jffs2_rtime_exit(void);
89 #ifdef CONFIG_JFFS2_ZLIB
90 int jffs2_zlib_init(void);
91 void jffs2_zlib_exit(void);
94 #endif /* __JFFS2_COMPR_H__ */