def storbinary(cmd, file, blocksize, rest_offset = nil, &block) # :yield: data
      if rest_offset
        file.seek(rest_offset, IO::SEEK_SET)
      end
      synchronize do
	voidcmd("TYPE I")
	conn = transfercmd(cmd, rest_offset)
	loop do
	  buf = file.read(blocksize)
	  break if buf == nil
	  conn.write(buf)
	  yield(buf) if block
	end
	conn.close
	voidresp
      end
    end
def storbinary(cmd, file, blocksize, rest_offset = nil, &block) # :yield: data
      if rest_offset
        file.seek(rest_offset, IO::SEEK_SET)
      end
      synchronize do
	voidcmd("TYPE I")
	conn = transfercmd(cmd, rest_offset)
	loop do
	  buf = file.read(blocksize)
	  break if buf == nil
	  conn.write(buf)
	  yield(buf) if block
	end
	conn.close
	voidresp
      end
    end
Puts the connection into binary (image) mode, issues the given server-side
 command (such as "STOR myfile"), and sends the contents of the file named
 +file+ to the server. If the optional block is given, it also passes it
 the data, in chunks of +blocksize+ characters.