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archives

Section: File Formats (4)
Updated: 3 Jul 1990
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NAME

archives - device header  

DESCRIPTION


 

/* Magic numbers */
#define CMN_ASC 0x070701    /* Cpio Magic Number for -c header */
#define CMN_BIN 070707      /* Cpio Magic Number for Binary header */
#define CMN_BBS 0143561     /* Cpio Magic Number for Byte-Swap header */
#define CMN_CRC 0x070702    /* Cpio Magic Number for CRC header */
#define CMS_ASC "070701"    /* Cpio Magic String for -c header */
#define CMS_CHR "070707"    /* Cpio Magic String for odc header */
#define CMS_CRC "070702"    /* Cpio Magic String for CRC header */
#define CMS_LEN 6           /* Cpio Magic String length */
/* Various header and field lengths */
#define CHRSZ   76         /* -H odc size minus filename field */
#define ASCSZ   110        /* -c and CRC hdr size minus filename field */
#define TARSZ   512        /* TAR hdr size */
#define HNAMLEN 256        /* maximum filename length for binary and
                           odc headers */
#define EXPNLEN 1024      /* maximum filename length for -c and
                          CRC headers */
#define HTIMLEN 2         /* length of modification time field */
#define HSIZLEN 2         /* length of file size field */
/* cpio binary header definition */
struct hdr_cpio {
        short   h_magic,                /* magic number field */
                h_dev;                  /* file system of file */
        ushort_t  h_ino,                  /* inode of file */
                h_mode,                 /* modes of file */
                h_uid,                  /* uid of file */
                h_gid;                  /* gid of file */
        short   h_nlink,                /* number of links to file */
                h_rdev,                 /* maj/min numbers for special files */
                h_mtime[HTIMLEN],       /* modification time of file */
                h_namesize,             /* length of filename */
                h_filesize[HSIZLEN];    /* size of file */
        char    h_name[HNAMLEN];        /* filename */
} ;
/* cpio -H odc header format */
struct c_hdr {
        char c_magic[CMS_LEN],
             c_dev[6],
             c_ino[6],
             c_mode[6],
             c_uid[6],
             c_gid[6],
             c_nlink[6],
             c_rdev[6],
             c_mtime[11],
             c_namesz[6],
             c_filesz[11],
             c_name[HNAMLEN];
} ;
/* -c and CRC header format */
struct Exp_cpio_hdr {
        char    E_magic[CMS_LEN],
                E_ino[8],
                E_mode[8],
                E_uid[8],
                E_gid[8],
                E_nlink[8],
                E_mtime[8],
                E_filesize[8],
                E_maj[8],
                E_min[8],
                E_rmaj[8],
                E_rmin[8],
                E_namesize[8],
                E_chksum[8],
                E_name[EXPNLEN];
} ;
/* Tar header structure and format */
#define TBLOCK  512     /* length of tar header and data blocks */
#define TNAMLEN 100     /* maximum length for tar file names */
#define TMODLEN 8       /* length of mode field */
#define TUIDLEN 8       /* length of uid field */
#define TGIDLEN 8       /* length of gid field */
#define TSIZLEN 12      /* length of size field */
#define TTIMLEN 12      /* length of modification time field */
#define TCRCLEN 8       /* length of header checksum field */
/* tar header definition */
union tblock {
        char dummy[TBLOCK];
        struct header {
            char    t_name[TNAMLEN];       /* name of file */
            char    t_mode[TMODLEN];       /* mode of file */
            char    t_uid[TUIDLEN];        /* uid of file */
            char    t_gid[TGIDLEN];        /* gid of file */
            char    t_size[TSIZLEN];       /* size of file in bytes */
            char    t_mtime[TTIMLEN];      /* modification time of file */
            char    t_chksum[TCRCLEN];     /* checksum of header */
            char    t_typeflag;            /* flag to indicate type of file */
            char    t_linkname[TNAMLEN];   /* file this file is linked with */
            char    t_magic[6];            /* magic string always "ustar" */
            char    t_version[2];          /* version strings always "00" */
            char    t_uname[32];           /* owner of file in ASCII */
            char    t_gname[32];           /* group of file in ASCII */
            char    t_devmajor[8];         /* major number for special files */
            char    t_devminor[8];         /* minor number for special files */
            char    t_prefix[155];         /* pathname prefix */
        } tbuf;
}
/* volcopy tape label format and structure */
#define VMAGLEN 8
#define VVOLLEN 6
#define VFILLEN 464
struct volcopy_label {
        char    v_magic[VMAGLEN],
                v_volume[VVOLLEN],
                v_reels,
                v_reel;
        long    v_time,
                v_length,
                v_dens,
                v_reelblks,     /* u370 added field */
                v_blksize,      /* u370 added field */
                v_nblocks;      /* u370 added field */
        char    v_fill[VFILLEN];
        long    v_offset;       /* used with -e and -reel options */
        int     v_type;         /* does tape have nblocks field? */
} ;

 


 

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Time: 02:37:15 GMT, October 02, 2010