1 /* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright (C) 2004 Ferenc Havasi <havasi@inf.u-szeged.hu>, 5 * University of Szeged, Hungary 6 * 7 * For licensing information, see the file 'LICENCE' in the 8 * jffs2 directory. 9 * 10 * $Id: compr.h,v 1.9 2005/11/07 11:14:38 gleixner Exp $ 11 * 12 */ 13 14 #ifndef __JFFS2_COMPR_H__ 15 #define __JFFS2_COMPR_H__ 16 17 #include <linux/kernel.h> 18 #include <linux/vmalloc.h> 19 #include <linux/list.h> 20 #include <linux/types.h> 21 #include <linux/string.h> 22 #include <linux/slab.h> 23 #include <linux/errno.h> 24 #include <linux/fs.h> 25 #include <linux/jffs2.h> 26 #include "jffs2_fs_i.h" 27 #include "jffs2_fs_sb.h" 28 #include "nodelist.h" 29 30 #define JFFS2_RUBINMIPS_PRIORITY 10 31 #define JFFS2_DYNRUBIN_PRIORITY 20 32 #define JFFS2_LZARI_PRIORITY 30 33 #define JFFS2_LZO_PRIORITY 40 34 #define JFFS2_RTIME_PRIORITY 50 35 #define JFFS2_ZLIB_PRIORITY 60 36 37 #define JFFS2_RUBINMIPS_DISABLED /* RUBINs will be used only */ 38 #define JFFS2_DYNRUBIN_DISABLED /* for decompression */ 39 40 #define JFFS2_COMPR_MODE_NONE 0 41 #define JFFS2_COMPR_MODE_PRIORITY 1 42 #define JFFS2_COMPR_MODE_SIZE 2 43 44 struct jffs2_compressor { 45 struct list_head list; 46 int priority; /* used by prirority comr. mode */ 47 char *name; 48 char compr; /* JFFS2_COMPR_XXX */ 49 int (*compress)(unsigned char *data_in, unsigned char *cpage_out, 50 uint32_t *srclen, uint32_t *destlen, void *model); 51 int (*decompress)(unsigned char *cdata_in, unsigned char *data_out, 52 uint32_t cdatalen, uint32_t datalen, void *model); 53 int usecount; 54 int disabled; /* if seted the compressor won't compress */ 55 unsigned char *compr_buf; /* used by size compr. mode */ 56 uint32_t compr_buf_size; /* used by size compr. mode */ 57 uint32_t stat_compr_orig_size; 58 uint32_t stat_compr_new_size; 59 uint32_t stat_compr_blocks; 60 uint32_t stat_decompr_blocks; 61 }; 62 63 int jffs2_register_compressor(struct jffs2_compressor *comp); 64 int jffs2_unregister_compressor(struct jffs2_compressor *comp); 65 66 int jffs2_compressors_init(void); 67 int jffs2_compressors_exit(void); 68 69 uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f, 70 unsigned char *data_in, unsigned char **cpage_out, 71 uint32_t *datalen, uint32_t *cdatalen); 72 73 int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f, 74 uint16_t comprtype, unsigned char *cdata_in, 75 unsigned char *data_out, uint32_t cdatalen, uint32_t datalen); 76 77 void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig); 78 79 /* Compressor modules */ 80 /* These functions will be called by jffs2_compressors_init/exit */ 81 82 #ifdef CONFIG_JFFS2_RUBIN 83 int jffs2_rubinmips_init(void); 84 void jffs2_rubinmips_exit(void); 85 int jffs2_dynrubin_init(void); 86 void jffs2_dynrubin_exit(void); 87 #endif 88 #ifdef CONFIG_JFFS2_RTIME 89 int jffs2_rtime_init(void); 90 void jffs2_rtime_exit(void); 91 #endif 92 #ifdef CONFIG_JFFS2_ZLIB 93 int jffs2_zlib_init(void); 94 void jffs2_zlib_exit(void); 95 #endif 96 97 #endif /* __JFFS2_COMPR_H__ */ 98