fs/jffs2/compr.h

   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  *
   7  * For licensing information, see the file 'LICENCE' in this directory.
   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>
  23 #include "jffs2_fs_i.h"
  24 #include "jffs2_fs_sb.h"
  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_RTIME_PRIORITY     50
  31 #define JFFS2_ZLIB_PRIORITY      60
  32 #define JFFS2_LZO_PRIORITY       80
  33
  34
  35 #define JFFS2_RUBINMIPS_DISABLED /* RUBINs will be used only */
  36 #define JFFS2_DYNRUBIN_DISABLED  /*        for decompression */
  37
  38 #define JFFS2_COMPR_MODE_NONE       0
  39 #define JFFS2_COMPR_MODE_PRIORITY   1
  40 #define JFFS2_COMPR_MODE_SIZE       2
  41 #define JFFS2_COMPR_MODE_FAVOURLZO  3
  42
  43 #define FAVOUR_LZO_PERCENT 80
  44
  45 struct jffs2_compressor {
  46         struct list_head list;
  47         int priority;                   /* used by prirority comr. mode */
  48         char *name;
  49         char compr;                     /* JFFS2_COMPR_XXX */
  50         int (*compress)(unsigned char *data_in, unsigned char *cpage_out,
  51                         uint32_t *srclen, uint32_t *destlen, void *model);
  52         int (*decompress)(unsigned char *cdata_in, unsigned char *data_out,
  53                           uint32_t cdatalen, uint32_t datalen, void *model);
  54         int usecount;
  55         int disabled;           /* if set the compressor won't compress */
  56         unsigned char *compr_buf;       /* used by size compr. mode */
  57         uint32_t compr_buf_size;        /* used by size compr. mode */
  58         uint32_t stat_compr_orig_size;
  59         uint32_t stat_compr_new_size;
  60         uint32_t stat_compr_blocks;
  61         uint32_t stat_decompr_blocks;
  62 };
  63
  64 int jffs2_register_compressor(struct jffs2_compressor *comp);
  65 int jffs2_unregister_compressor(struct jffs2_compressor *comp);
  66
  67 int jffs2_compressors_init(void);
  68 int jffs2_compressors_exit(void);
  69
  70 uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
  71                         unsigned char *data_in, unsigned char **cpage_out,
  72                         uint32_t *datalen, uint32_t *cdatalen);
  73
  74 int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
  75                      uint16_t comprtype, unsigned char *cdata_in,
  76                      unsigned char *data_out, uint32_t cdatalen, uint32_t datalen);
  77
  78 void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig);
  79
  80 /* Compressor modules */
  81 /* These functions will be called by jffs2_compressors_init/exit */
  82
  83 #ifdef CONFIG_JFFS2_RUBIN
  84 int jffs2_rubinmips_init(void);
  85 void jffs2_rubinmips_exit(void);
  86 int jffs2_dynrubin_init(void);
  87 void jffs2_dynrubin_exit(void);
  88 #endif
  89 #ifdef CONFIG_JFFS2_RTIME
  90 int jffs2_rtime_init(void);
  91 void jffs2_rtime_exit(void);
  92 #endif
  93 #ifdef CONFIG_JFFS2_ZLIB
  94 int jffs2_zlib_init(void);
  95 void jffs2_zlib_exit(void);
  96 #endif
  97 #ifdef CONFIG_JFFS2_LZO
  98 int jffs2_lzo_init(void);
  99 void jffs2_lzo_exit(void);
 100 #endif
 101
 102 #endif /* __JFFS2_COMPR_H__ */