+static int image_save_datafile(struct image_tool_params *params,
+ ulong file_data, ulong file_len)
+{
+ int dfd;
+ const char *datafile = params->outfile;
+
+ dfd = open(datafile, O_RDWR | O_CREAT | O_TRUNC | O_BINARY,
+ S_IRUSR | S_IWUSR);
+ if (dfd < 0) {
+ fprintf(stderr, "%s: Can't open \"%s\": %s\n",
+ params->cmdname, datafile, strerror(errno));
+ return -1;
+ }
+
+ if (write(dfd, (void *)file_data, file_len) != (ssize_t)file_len) {
+ fprintf(stderr, "%s: Write error on \"%s\": %s\n",
+ params->cmdname, datafile, strerror(errno));
+ close(dfd);
+ return -1;
+ }
+
+ close(dfd);
+
+ return 0;
+}
+
+static int image_extract_datafile(void *ptr, struct image_tool_params *params)
+{
+ const image_header_t *hdr = (const image_header_t *)ptr;
+ ulong file_data;
+ ulong file_len;
+
+ if (image_check_type(hdr, IH_TYPE_MULTI)) {
+ ulong idx = params->pflag;
+ ulong count;
+
+ /* get the number of data files present in the image */
+ count = image_multi_count(hdr);
+
+ /* retrieve the "data file" at the idx position */
+ image_multi_getimg(hdr, idx, &file_data, &file_len);
+
+ if ((file_len == 0) || (idx >= count)) {
+ fprintf(stderr, "%s: No such data file %ld in \"%s\"\n",
+ params->cmdname, idx, params->imagefile);
+ return -1;
+ }
+ } else {
+ file_data = image_get_data(hdr);
+ file_len = image_get_size(hdr);
+ }
+
+ /* save the "data file" into the file system */
+ return image_save_datafile(params, file_data, file_len);
+}
+