SilcBool silc_sftp_fs_memory_add_file(SilcSFTPFilesystem fs, void *dir,
                                          SilcSFTPFSMemoryPerm perm,
                                          const char *filename,
                                          const char *realpath);

    Adds a new file to the directory indicated by the `dir'.  If the `dir'
    is NULL the file is added to the root directory. The `filename' is the
    filename in the directory. The `realpath' is the real filepath in the
    physical filesystem. The real path must include the schema to
    indicate where the file is actually located.  The only supported
    schema currently is "file://".  It is used to actually access the fil
    from the memory filesystem. The `perm' will indicate the permissions
    for the file and they work in POSIX style. Returns TRUE if the file
    was added to the directory.