| /* |
| * JFFS2 -- Journalling Flash File System, Version 2. |
| * |
| * Copyright © 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>, |
| * University of Szeged, Hungary |
| * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> |
| * |
| * For licensing information, see the file 'LICENCE' in this directory. |
| * |
| */ |
| |
| #ifndef __JFFS2_COMPR_H__ |
| #define __JFFS2_COMPR_H__ |
| |
| #include <linux/kernel.h> |
| #include <linux/vmalloc.h> |
| #include <linux/list.h> |
| #include <linux/types.h> |
| #include <linux/string.h> |
| #include <linux/slab.h> |
| #include <linux/errno.h> |
| #include <linux/fs.h> |
| #include <linux/jffs2.h> |
| #include "jffs2_fs_i.h" |
| #include "jffs2_fs_sb.h" |
| #include "nodelist.h" |
| |
| #define JFFS2_RUBINMIPS_PRIORITY 10 |
| #define JFFS2_DYNRUBIN_PRIORITY 20 |
| #define JFFS2_LZARI_PRIORITY 30 |
| #define JFFS2_RTIME_PRIORITY 50 |
| #define JFFS2_ZLIB_PRIORITY 60 |
| #define JFFS2_LZO_PRIORITY 80 |
| |
| |
| #define JFFS2_RUBINMIPS_DISABLED /* RUBINs will be used only */ |
| #define JFFS2_DYNRUBIN_DISABLED /* for decompression */ |
| |
| #define JFFS2_COMPR_MODE_NONE 0 |
| #define JFFS2_COMPR_MODE_PRIORITY 1 |
| #define JFFS2_COMPR_MODE_SIZE 2 |
| #define JFFS2_COMPR_MODE_FAVOURLZO 3 |
| #define JFFS2_COMPR_MODE_FORCELZO 4 |
| #define JFFS2_COMPR_MODE_FORCEZLIB 5 |
| |
| #define FAVOUR_LZO_PERCENT 80 |
| |
| struct jffs2_compressor { |
| struct list_head list; |
| int priority; /* used by prirority comr. mode */ |
| char *name; |
| char compr; /* JFFS2_COMPR_XXX */ |
| int (*compress)(unsigned char *data_in, unsigned char *cpage_out, |
| uint32_t *srclen, uint32_t *destlen); |
| int (*decompress)(unsigned char *cdata_in, unsigned char *data_out, |
| uint32_t cdatalen, uint32_t datalen); |
| int usecount; |
| int disabled; /* if set the compressor won't compress */ |
| unsigned char *compr_buf; /* used by size compr. mode */ |
| uint32_t compr_buf_size; /* used by size compr. mode */ |
| uint32_t stat_compr_orig_size; |
| uint32_t stat_compr_new_size; |
| uint32_t stat_compr_blocks; |
| uint32_t stat_decompr_blocks; |
| }; |
| |
| int jffs2_register_compressor(struct jffs2_compressor *comp); |
| int jffs2_unregister_compressor(struct jffs2_compressor *comp); |
| |
| int jffs2_compressors_init(void); |
| int jffs2_compressors_exit(void); |
| |
| uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f, |
| unsigned char *data_in, unsigned char **cpage_out, |
| uint32_t *datalen, uint32_t *cdatalen); |
| |
| int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f, |
| uint16_t comprtype, unsigned char *cdata_in, |
| unsigned char *data_out, uint32_t cdatalen, uint32_t datalen); |
| |
| void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig); |
| |
| /* Compressor modules */ |
| /* These functions will be called by jffs2_compressors_init/exit */ |
| |
| #ifdef CONFIG_JFFS2_RUBIN |
| int jffs2_rubinmips_init(void); |
| void jffs2_rubinmips_exit(void); |
| int jffs2_dynrubin_init(void); |
| void jffs2_dynrubin_exit(void); |
| #endif |
| #ifdef CONFIG_JFFS2_RTIME |
| int jffs2_rtime_init(void); |
| void jffs2_rtime_exit(void); |
| #endif |
| #ifdef CONFIG_JFFS2_ZLIB |
| int jffs2_zlib_init(void); |
| void jffs2_zlib_exit(void); |
| #endif |
| #ifdef CONFIG_JFFS2_LZO |
| int jffs2_lzo_init(void); |
| void jffs2_lzo_exit(void); |
| #endif |
| |
| #endif /* __JFFS2_COMPR_H__ */ |