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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 | /* * 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__ */ |