rock.h

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/*
 * 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 */