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_LZO_PRIORITY 40 31 #define JFFS2_RTIME_PRIORITY 50 32 #define JFFS2_ZLIB_PRIORITY 60 33 34 #define JFFS2_RUBINMIPS_DISABLED /* RUBINs will be used only */ 35 #define JFFS2_DYNRUBIN_DISABLED /* for decompression */ 36 37 #define JFFS2_COMPR_MODE_NONE 0 38 #define JFFS2_COMPR_MODE_PRIORITY 1 39 #define JFFS2_COMPR_MODE_SIZE 2 40 41 struct jffs2_compressor { 42 struct list_head list; 43 int priority; /* used by prirority comr. mode */ 44 char *name; 45 char compr; /* JFFS2_COMPR_XXX */ 46 int (*compress)(unsigned char *data_in, unsigned char *cpage_out, 47 uint32_t *srclen, uint32_t *destlen, void *model); 48 int (*decompress)(unsigned char *cdata_in, unsigned char *data_out, 49 uint32_t cdatalen, uint32_t datalen, void *model); 50 int usecount; 51 int disabled; /* if set the compressor won't compress */ 52 unsigned char *compr_buf; /* used by size compr. mode */ 53 uint32_t compr_buf_size; /* used by size compr. mode */ 54 uint32_t stat_compr_orig_size; 55 uint32_t stat_compr_new_size; 56 uint32_t stat_compr_blocks; 57 uint32_t stat_decompr_blocks; 58 }; 59 60 int jffs2_register_compressor(struct jffs2_compressor *comp); 61 int jffs2_unregister_compressor(struct jffs2_compressor *comp); 62 63 int jffs2_compressors_init(void); 64 int jffs2_compressors_exit(void); 65 66 uint16_t jffs2_compress(struct jffs2_sb_info *c, struct jffs2_inode_info *f, 67 unsigned char *data_in, unsigned char **cpage_out, 68 uint32_t *datalen, uint32_t *cdatalen); 69 70 int jffs2_decompress(struct jffs2_sb_info *c, struct jffs2_inode_info *f, 71 uint16_t comprtype, unsigned char *cdata_in, 72 unsigned char *data_out, uint32_t cdatalen, uint32_t datalen); 73 74 void jffs2_free_comprbuf(unsigned char *comprbuf, unsigned char *orig); 75 76 /* Compressor modules */ 77 /* These functions will be called by jffs2_compressors_init/exit */ 78 79 #ifdef CONFIG_JFFS2_RUBIN 80 int jffs2_rubinmips_init(void); 81 void jffs2_rubinmips_exit(void); 82 int jffs2_dynrubin_init(void); 83 void jffs2_dynrubin_exit(void); 84 #endif 85 #ifdef CONFIG_JFFS2_RTIME 86 int jffs2_rtime_init(void); 87 void jffs2_rtime_exit(void); 88 #endif 89 #ifdef CONFIG_JFFS2_ZLIB 90 int jffs2_zlib_init(void); 91 void jffs2_zlib_exit(void); 92 #endif 93 94 #endif /* __JFFS2_COMPR_H__ */ 95