def METHOD_NAME(self, buffer):
    rawmode, stride, orientation = self.args
    pagesize = self.state.xsize * self.state.ysize
    zsize = len(self.mode)
    self.fd.seek(512)
    for band in range(zsize):
        channel = Image.new("L", (self.state.xsize, self.state.ysize))
        channel.frombytes(
            self.fd.read(2 * pagesize), "raw", "L;16B", stride, orientation
        )
        self.im.putband(channel.im, band)
    return -1, 0