/*
   * 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__ */