/*  ARC - Archive utility - Archive file header format

    Version 2.13, created on 01/07/86 at 17:17:32

Copyright 1989 Lawrence J. Jones; All Rights Reserved
(C) COPYRIGHT 1985 by System Enhancement Associates; ALL RIGHTS RESERVED

    By:  Thom Henderson

    Description:
         This file defines the format of an archive file header, excluding
         the archive marker and the header version number.

         Each entry in an archive begins with a one byte archive marker,
         which is set to ARCMARK.  The marker is followed by a one byte
         header type code, from zero to ARCVER.

         If the header type code is zero, then it is an end marker, and
         no more data should be read from the archive.

         If the header type code is in the range 2 to ARCVER, then it is
         followed by a standard archive header, which is defined below.

         If the header type code is one, then it is followed by an older
         format archive header.  The older format header does not contain
         the true length.  A header should be read for a length of
         sizeof(struct heads)-sizeof(long).  Then set length equal to size
         and change the header version to 2.

    Programming note:
         The crc value given in the header is based on the unpacked data.

    Language:
         Computer Innovations Optimizing C86
*/

#define ARCMARK 26              /* special archive marker */
#define ARCVER   9              /* archive header version code */
#define STRLEN 100              /* system standard string length */
#define FNLEN   13              /* file name length */
#define MAXARG  25              /* maximum number of arguments */

struct heads {                  /* archive entry header format */
   char name[FNLEN];            /* file name */
   long size;                   /* size of file, in bytes */
   unsigned short date;         /* creation date */
   unsigned short time;         /* creation time */
   unsigned short crc;          /* cyclic redundancy check */
   long length;                 /* true file length */
   };