/*
 * This module implements the restore-file command; this command
 * reads binary files previously saved with the savebin command
 * and writes the backed-up bits back to the SIM.
 */

#include <sys/types.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "curfile.h"

static
restore_transparent(data)
	u_char *data;
{
	unsigned off, cc;
	int rc;

	for (off = 0; off < curfile_total_size; off += cc) {
		cc = curfile_total_size - off;
		if (cc > 255)
			cc = 255;
		rc = update_bin_op(off, data + off, cc);
		if (rc < 0)
			return(rc);
	}
	return(0);
}

static
restore_records(data)
	u_char *data;
{
	unsigned recno;
	u_char *dp;
	int rc;

	dp = data;
	for (recno = 1; recno <= curfile_record_count; recno++) {
		rc = update_rec_op(recno, 0x04, dp, curfile_record_len);
		if (rc < 0)
			return(rc);
		dp += curfile_record_len;
	}
	return(0);
}

cmd_restore_file(argc, argv)
	char **argv;
{
	int file_id, rc, fd;
	struct stat st;
	u_char *databuf;

	if (isxdigit(argv[1][0]) && isxdigit(argv[1][1]) &&
	    isxdigit(argv[1][2]) && isxdigit(argv[1][3]) && !argv[1][4])
		file_id = strtoul(argv[1], 0, 16);
	else
		file_id = find_symbolic_file_name(argv[1]);
	if (file_id < 0) {
		fprintf(stderr,
"error: file ID argument is not a hex value or a recognized symbolic name\n");
		return(-1);
	}
	rc = select_op(file_id);
	if (rc < 0)
		return(rc);
	rc = parse_ef_select_response();
	if (rc < 0)
		return(rc);
	if (!curfile_total_size) {
		printf("SIM indicates file of zero length, nothing to do\n");
		return(0);
	}
	fd = open(argv[2], O_RDONLY);
	if (fd < 0) {
		perror(argv[2]);
		return(-1);
	}
	fstat(fd, &st);
	if ((st.st_mode & S_IFMT) != S_IFREG) {
		fprintf(stderr, "error: %s is not a regular file\n", argv[2]);
		close(fd);
		return(-1);
	}
	if (st.st_size != curfile_total_size) {
		fprintf(stderr,
	"error: length of %s does not match SIM EF length of %u bytes\n",
			argv[2], curfile_total_size);
		close(fd);
		return(-1);
	}
	databuf = malloc(curfile_total_size);
	if (!databuf) {
		perror("malloc for file data");
		close(fd);
		return(-1);
	}
	read(fd, databuf, curfile_total_size);
	close(fd);
	switch (curfile_structure) {
	case 0x00:
		/* transparent */
		rc = restore_transparent(databuf);
		break;
	case 0x01:
		/* record-based */
		rc = restore_records(databuf);
		break;
	case 0x03:
		fprintf(stderr, "error: cyclic files are not supported\n");
		rc = -1;
	}
	free(databuf);
	return(rc);
}