/* <vms/lib/fm1def.h>
 *
 *	F11DEF - file header map/retrieval area, ODS level 1	[not in Starlet]
 */
#ifndef _FM1DEF_H
#define _FM1DEF_H

#define FM1$K_POINTERS	10	/* start of retrieval pointers */
#define FM1$C_POINTERS	10
#define FM1$K_LENGTH	10	/* length of map area */
#define FM1$C_LENGTH	10
#define FM1$S_FM1DEF	10
struct fm1def {
    unsigned char fm1$b_ex_segnum;	/* extension segment number of this header */
    unsigned char fm1$b_ex_rvn;		/* extension relative volume number */
    unsigned short fm1$w_ex_filnum;	/* extension file number */
    unsigned short fm1$w_ex_filseq;	/* extension file sequence number */
    unsigned char fm1$b_countsize;	/* retrieval pointer count field size */
    unsigned char fm1$b_lbnsize;	/* retrieval pointer LBN field size */
    unsigned char fm1$b_inuse;		/* number of retrieval words in use */
    unsigned char fm1$b_avail;		/* number of retrieval words available */
};
/*  retrieval pointer format */
#define FM1$S_FM1DEF1	4
struct fm1def1 {
    unsigned char fm1$b_highlbn;	/* high order LBN */
    unsigned char fm1$b_count;		/* block count */
    unsigned short fm1$w_lowlbn;	/* low order LBN */
};
#define FM1$S_FM1DEF2	5
struct fm1def2 {	/* origin has offset -12 */
    unsigned char fm1$b_prevhlbn;
    unsigned char fm1$b_prevcount;
    unsigned short fm1$w_prevllbn;	/* previous retrieval pointer */
    unsigned	: 8;
};

#endif	/*_FM1DEF_H*/