[Libmtp-discuss] fixes for Samsung YP-U3JQW (and perhaps others)

[libmtp <li...@mn...>]

On my "Samsung YP-U3JQW", "mtp-delfile" didn't work for
either "mtp-delfile -n fileid" or "mtp-delfile -f filename"
using "libmtp-0.2.5".

I'm not up on these things and perhaps this has already been
discussed or even fixed, but in case not fyi:

(1) mtp-delfile -n fileid
    The Samsung YP-U3JQW apparently uses the full 32 bits for
    a "fileid" and in "libmtp-0.2.5/examples/delfile.c", in
    both functions delfile_function() and delfile_command()
    there is,
	    int id;
    In both places I changed it to:
	    unsigned id;
    And I could then delete files by "fileid".

(2) mtp-delfile -f filename
    Although the usage message for "mtp-delfile" says this should
    work, there is no code to convert the "filename" to a "fileid"
    and "mtp-delfile" was failing silently.  I fixed this in the
    function parse_path() in file "libmtp-0.2.5/examples/pathutils.c",
    by adding some code to:

	  if (*path != '/') {
	    int item_id = strtoul(path, &rest, 0);
	    // really should check contents of "rest" here...
	    return item_id;
	  }

    Resulting in:

	  if (*path != '/') {
	    int item_id = strtoul(path, &rest, 0);
	    // really should check contents of "rest" here...
	    if (item_id == 0) {		/* if not number, assume a file name */
		LIBMTP_file_t * file = files;
		while (file != NULL) {		/* search for matching name */
		  if (strcasecmp (file->filename, path) == 0) {
		    return file->item_id;	/* found it */
		  }
		  file = file->next;
		}
	    }
	    return item_id;
	  }

I'm new to "libmtp" so no guarantees that I haven't broken something.
But I just wanted to give something back to this project, since as a
linux only user "libmtp" made it possible for me to use my "YP-U3"
which I bought not realizing it wouldn't mount as a file system.