TAR Archive Format(TAR.rfh):
Class: Archive, Status: Complete, Last change: 9/29/2000 5:10:12 PM

data

/*
 * Standard Archive Format - Standard TAR - USTAR
 */
const
  RECORDSIZE = 512;
  NAMSIZ = 100;
  TUNMLEN = 32;
  TGNMLEN = 32;

type

TChar8  array[8] of Char
TNumChar8 struc
  array[6] of Char S
  Char Space
  Char Z
ends:assert[@.Space=0x20/*' '*/,@.Z=0]:displ=(@.S)

TChar12 struc
  array of Char ?@<>32!void; Space0
  array of Char S
  Char Space
ends:[@:Size=12]:assert[@.Space=0x20/*' '*/]:displ=(@.S)

const
  Days1970=DateToDays(1970,1,1);
  DaySec=24*60*60;

type
TTime12  struc
  array of Char ?@<>32!void; Space0
  array of Char S
  Char Space
ends:[@:Size=12]:assert[@.Space=32/*' '*/]:displ=(
  INT(DaysToDay(Days1970+StrToInt(@.S,8) div DaySec)),'.',
  INT(DaysToMonth(Days1970+StrToInt(@.S,8) div DaySec)),'.',
  INT(DaysToYear(Days1970+StrToInt(@.S,8) div DaySec)),' ',
  INT((StrToInt(@.S,8) div (60*60))mod 24),':',
  INT((StrToInt(@.S,8) div 60)mod 60),'''',
  INT(StrToInt(@.S,8) mod 60),'"')


TName   array[NAMSIZ] of Char,<0;
TUName  array[TUNMLEN] of Char,<0;
TGName  array[TGNMLEN] of Char,<0;
TMagic  array[8] of Char,<0;

/* The linkflag defines the type of file */
TLinkFlag enum char (
  LF_OLDNORMAL = 0,  /* Normal disk file, Unix compatible */
  LF_NORMAL  = '0',  /* Normal disk file */
  LF_LINK    = '1',  /* Link to previously dumped file */
  LF_SYMLINK = '2',  /* Symbolic link */
  LF_CHR     = '3',  /* Character special file */
  LF_BLK     = '4',  /* Block special file */
  LF_DIR     = '5',  /* Directory */
  LF_FIFO    = '6',  /* FIFO special file */
  LF_CONTIG  = '7',  /* Contiguous file */
/* Further link types may be defined later. */
// GNU Extensions to the Archive Format:
  LF_DUMPDIR='D', /*directory and a list of files created by the -G option*/
                 //Each filename is preceded by either
                 //a 'Y' (the file should be in this archive) or
                 //an 'N' (The file is a directory, or is not stored in the archive).
                 //Each filename is terminated by a null.  There is an additional null
                 //after the last filename.
  LF_MULTIVOL='M', /*a file continued from another volume of a
                   multi-volume archive created with the-M option.*/
  LF_VOLHDR='V'  /*volume header that was given with the -V option*/
)

THeader struc
  TName   name;
  TNumChar8  mode;
  TNumChar8 uid;
  TNumChar8 gid;
  TChar12 size;
  TTime12 mtime;
  TChar8  chksum;
  TLinkFlag linkflag;
  TName   linkname;
  TMagic  magic;
  TUName  uname;
  TGName  gname;
  TChar8  devmajor;
  TChar8  devminor;
  align RECORDSIZE at &@; Rest
ends

TFileRec struc
  THeader Hdr
  raw[StrToInt(@.Hdr.size.S,8)] FData
  align RECORDSIZE at &@; Rest
ends

data

0 array of TFileRec:[@:Size=FileSize] Files

//assert Hdr:assert;

descr ('TAR Archive File Format.',NL,
  'Info Source: TAR Format',NL,
  '  Information from File Format List 2.0 by Max Maischein.', NL,
  '  (tar.zip at www.wotsit.org)',NL)

/*
@example

/* The checksum field is filled with this while the checksum is computed. */
#define    CHKBLANKS    "        "        /* 8 blanks, no null */

/* The magic field is filled with this if uname and gname are valid. */
#define    TMAGIC    "ustar  "        /* 7 chars and a null */

/* The magic field is filled with this if this is a GNU format dump entry */
#define    GNUMAGIC  "GNUtar "        /* 7 chars and a null */


/* Bits used in the mode field - values in octal */
#define  TSUID    04000        /* Set UID on execution */
#define  TSGID    02000        /* Set GID on execution */
#define  TSVTX    01000        /* Save text (sticky bit) */

/* File permissions */
#define  TUREAD   00400        /* read by owner */
#define  TUWRITE  00200        /* write by owner */
#define  TUEXEC   00100        /* execute/search by owner */
#define  TGREAD   00040        /* read by group */
#define  TGWRITE  00020        /* write by group */
#define  TGEXEC   00010        /* execute/search by group */
#define  TOREAD   00004        /* read by other */
#define  TOWRITE  00002        /* write by other */
#define  TOEXEC   00001        /* execute/search by other */
@end example
*/


Other specifications.


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