/* 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? */
} ;

/*
 * Define archive formats for extended attributes.
 *
 * Extended attributes are stored in two pieces.
 * 1. An attribute header which has information about
 * what file the attribute is for and what the attribute
 * is named.
 * 2. The attribute record itself. Stored as a normal file type
 * of entry.
 * Both the header and attribute record have special modes/typeflags
 * associated with them.
 *
 * The names of the header in the archive look like:
 * /dev/null/attr.hdr
 *
 * The name of the attribute looks like:
 * /dev/null/attr.
 *
 * This is done so that an archiver that doesn't understand these formats
 * can just dispose of the attribute records unless the user chooses to
 * rename them via cpio -r or pax -i
 *
 * The format is composed of a fixed size header followed
 * by a variable sized xattr_buf. If the attribute is a hard link
 * to another attribute, then another xattr_buf section is included
 * for the link.
 *
 * The xattr_buf is used to define the necessary "pathing" steps
 * to get to the extended attribute. This is necessary to support
 * a fully recursive attribute model where an attribute may itself
 * have an attribute.
 *
 * The basic layout looks like this.
 *
* --------------------------------
 * | |
 * | xattr_hdr |
 * | |
 * --------------------------------
 * --------------------------------
 * | |
 * | xattr_buf |
 * | |
 * --------------------------------
 * --------------------------------
 * | |
 * | (optional link info) |
 * | |
 * --------------------------------
 * --------------------------------
 * | |
 * | attribute itself |
 * | stored as normal tar |
 * | or cpio data with |
 * | special mode or |
 * | typeflag |
 * | |
 * --------------------------------
 *
 */
#define XATTR_ARCH_VERS "1.0"

/*
 * extended attribute fixed header
 *
 * h_version format version.
 * h_size size of header + variable sized data sections.
 * h_component_len Length of entire pathing section.
 * h_link_component_len Length of link component section. Again same 
 * definition as h_component_len.
 */
struct xattr_hdr {
 char h_version[7];
 char h_size[10];
 char h_component_len[10]; /* total length of path component */
 char h_link_component_len[10];
};

/*
 * The name is encoded like this:
 * filepathNULattrpathNUL[attrpathNULL]...
 */
struct xattr_buf {
 char h_namesz[7]; /* length of h_names */
 char h_typeflag; /* actual typeflag of file being archived */
 char h_names[1]; /* filepathNULattrpathNUL... */
};

/*
 * Special values for tar archives
 */

/*
 * typeflag for tar archives.
 */

/*
 * Attribute hdr and attribute files have the following typeflag
 */
#define _XATTR_HDRTYPE 'E'

/*
 * For cpio archives the header and attribute have
 * _XATTR_CPIO_MODE ORED into the mode field in both
 * character and binary versions of the archive format
 */
#define _XATTR_CPIO_MODE 0xB000