File: arcs.h

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/*
 * ARC - Archive utility - Archive file header format
 * 
 * Version 2.12, created on 12/17/85 at 14:40:26
 * 
 * (C) COPYRIGHT 1985-87 by System Enhancement Associates.
 * You may copy and distribute this program freely,
 * under the terms of the General Public License.
 * 
 * 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 26.  The marker is followed by a one byte header type code, from zero
 * to 7.
 * 
 * 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 7, 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
 */

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 */
                short crc;	/* cyclic redundancy check */
                long length;	/* true file length */
};