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/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/stat.h> 22 #include "nodelist.h" 23 24 #ifdef __cplusplus 25 #if __cplusplus 26 extern "C" { 27 #endif /* __cplusplus */ 28 #endif /* __cplusplus */ 29 30 #define JFFS2_RUBINMIPS_PRIORITY 10 31 #define JFFS2_DYNRUBIN_PRIORITY 20 32 #define JFFS2_LZARI_PRIORITY 30 33 #define JFFS2_RTIME_PRIORITY 50 34 #define JFFS2_ZLIB_PRIORITY 60 35 #define JFFS2_LZO_PRIORITY 80 36 37 38 #define JFFS2_RUBINMIPS_DISABLED /* RUBINs will be used only */ 39 #define JFFS2_DYNRUBIN_DISABLED /* for decompression */ 40 41 #define JFFS2_COMPR_MODE_NONE 0 42 #define JFFS2_COMPR_MODE_PRIORITY 1 43 #define JFFS2_COMPR_MODE_SIZE 2 44 #define JFFS2_COMPR_MODE_FAVOURLZO 3 45 #define JFFS2_COMPR_MODE_FORCELZO 4 46 #define JFFS2_COMPR_MODE_FORCEZLIB 5 47 48 #define FAVOUR_LZO_PERCENT 80 49 50 struct jffs2_compressor { 51 struct list_head list; 52 int priority; /* used by prirority comr. mode */ 53 char *name; 54 char compr; /* JFFS2_COMPR_XXX */ 55 int (*compress)(unsigned char *data_in, unsigned char *cpage_out, 56 uint32_t *srclen, uint32_t *destlen); 57 int (*decompress)(unsigned char *cdata_in, unsigned char *data_out, 58 uint32_t cdatalen, uint32_t datalen); 59 int usecount; 60 int disabled; /* if set the compressor won't compress */ 61 unsigned char *compr_buf; /* used by size compr. mode */ 62 uint32_t compr_buf_size; /* used by size compr. mode */ 63 uint32_t stat_compr_orig_size; 64 uint32_t stat_compr_new_size; 65 uint32_t stat_compr_blocks; 66 uint32_t stat_decompr_blocks; 67 }; 68 69 int jffs2_register_compressor(struct jffs2_compressor *comp); 70 int jffs2_unregister_compressor(struct jffs2_compressor *comp); 71 72 int jffs2_compressors_init(void); 73 int jffs2_compressors_exit(void); 74 75 uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f, 76 unsigned char *data_in, unsigned char **cpage_out, 77 uint32_t *datalen, uint32_t *cdatalen); 78 79 int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f, 80 uint16_t comprtype, unsigned char *cdata_in, 81 unsigned char *data_out, uint32_t cdatalen, uint32_t datalen); 82 83 void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig); 84 85 /* Compressor modules */ 86 /* These functions will be called by jffs2_compressors_init/exit */ 87 88 #ifdef CONFIG_JFFS2_RUBIN 89 int jffs2_rubinmips_init(void); 90 void jffs2_rubinmips_exit(void); 91 int jffs2_dynrubin_init(void); 92 void jffs2_dynrubin_exit(void); 93 #endif 94 #ifdef CONFIG_JFFS2_RTIME 95 int jffs2_rtime_init(void); 96 void jffs2_rtime_exit(void); 97 #endif 98 #ifdef CONFIG_JFFS2_ZLIB 99 int jffs2_zlib_init(void); 100 void jffs2_zlib_exit(void); 101 #endif 102 #ifdef CONFIG_JFFS2_LZO 103 int jffs2_lzo_init(void); 104 void jffs2_lzo_exit(void); 105 #endif 106 107 #ifdef __cplusplus 108 #if __cplusplus 109 } 110 #endif /* __cplusplus */ 111 #endif /* __cplusplus */ 112 113 #endif /* __JFFS2_COMPR_H__ */ 114