+static int image_extract_subimage(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 imagetool_save_subimage(params->outfile, file_data, file_len);
+}
+