/*
Program: BIGARRAY.H
Author : Kim Moser
Date   : 11/17/1991
System : IBM PC / Borland Turbo C 2.0
Descrip: Disk-based arrays
*/

#include <stdio.h>
#include <stdlib.h>

typedef long index_type;

typedef struct {
	char *fname;
	FILE *fp;
	index_type num_elmts;
	size_t elmt_size;
	void *last_elmt;  /* Copy of last elmt read */
	index_type last_elmt_index;  /* Index of last elmt read */
	index_type file_pointer_index;  /* What elmt file pointer is at */
} BigArray;

extern BigArray *BigArray_calloc(char *fname, index_type num_elmts, size_t elmt_size);
/* Initializes array, using file 'fname'. */

extern int BigArray_free(BigArray *array);
/* Frees array (deletes file).  Returns whether successful. */

extern void *BigArray_element(BigArray *array, index_type i, void *dest);
/* If 'dest' != NULL, copies i'th element of array to 'dest' and returns 'dest',
   else returns pointer to temporary copy of i'th elmt. */

extern int BigArray_assign(BigArray *array, index_type i, void *src);
/* Copies 'src' to i'th element of array. */