/*
   * These structs are used by the system-use-sharing protocol, in which the
   * Rock Ridge extensions are embedded.  It is quite possible that other
   * extensions are present on the disk, and this is fine as long as they
   * all use SUSP
   */

  struct SU_SP_s {

  	unsigned char magic[2];
  	unsigned char skip;
  } __attribute__ ((packed));

  struct SU_CE_s {

  	char extent[8];
  	char offset[8];
  	char size[8];

  };

  struct SU_ER_s {

  	unsigned char len_id;
  	unsigned char len_des;
  	unsigned char len_src;
  	unsigned char ext_ver;
  	char data[0];
  } __attribute__ ((packed));

  struct RR_RR_s {

  	char flags[1];
  } __attribute__ ((packed));

  struct RR_PX_s {

  	char mode[8];
  	char n_links[8];
  	char uid[8];
  	char gid[8];

  };

  struct RR_PN_s {

  	char dev_high[8];
  	char dev_low[8];

  };

  struct SL_component {
  	unsigned char flags;
  	unsigned char len;
  	char text[0];
  } __attribute__ ((packed));

  struct RR_SL_s {

  	unsigned char flags;
  	struct SL_component link;
  } __attribute__ ((packed));

  struct RR_NM_s {

  	unsigned char flags;
  	char name[0];
  } __attribute__ ((packed));

  struct RR_CL_s {

  	char location[8];

  };

  struct RR_PL_s {

  	char location[8];

  };

  struct stamp {
  	char time[7];
  } __attribute__ ((packed));

  struct RR_TF_s {

  	char flags;
  	struct stamp times[0];	/* Variable number of these beasts */
  } __attribute__ ((packed));

  
  /* Linux-specific extension for transparent decompression */

  struct RR_ZF_s {

  	char algorithm[2];
  	char parms[2];
  	char real_size[8];

  };

  /*
   * These are the bits and their meanings for flags in the TF structure.
   */

  #define TF_CREATE 1
  #define TF_MODIFY 2
  #define TF_ACCESS 4
  #define TF_ATTRIBUTES 8
  #define TF_BACKUP 16
  #define TF_EXPIRATION 32
  #define TF_EFFECTIVE 64
  #define TF_LONG_FORM 128

  struct rock_ridge {
  	char signature[2];
  	unsigned char len;
  	unsigned char version;
  	union {

  		struct SU_SP_s SP;
  		struct SU_CE_s CE;
  		struct SU_ER_s ER;
  		struct RR_RR_s RR;
  		struct RR_PX_s PX;
  		struct RR_PN_s PN;
  		struct RR_SL_s SL;
  		struct RR_NM_s NM;
  		struct RR_CL_s CL;
  		struct RR_PL_s PL;
  		struct RR_TF_s TF;
  		struct RR_ZF_s ZF;

  	} u;

  };

  #define RR_PX 1			/* POSIX attributes */
  #define RR_PN 2			/* POSIX devices */
  #define RR_SL 4			/* Symbolic link */
  #define RR_NM 8			/* Alternate Name */
  #define RR_CL 16		/* Child link */
  #define RR_PL 32		/* Parent link */
  #define RR_RE 64		/* Relocation directory */
  #define RR_TF 128		/* Timestamps */