_g_v_a_r.py 文件源码

def compileOffsets_(offsets):
        """Packs a list of offsets into a 'gvar' offset table.

        Returns a pair (bytestring, tableFormat). Bytestring is the
        packed offset table. Format indicates whether the table
        uses short (tableFormat=0) or long (tableFormat=1) integers.
        The returned tableFormat should get packed into the flags field
        of the 'gvar' header.
        """
        assert len(offsets) >= 2
        for i in range(1, len(offsets)):
            assert offsets[i - 1] <= offsets[i]
        if max(offsets) <= 0xffff * 2:
            packed = array.array("H", [n >> 1 for n in offsets])
            tableFormat = 0
        else:
            packed = array.array("I", offsets)
            tableFormat = 1
        if sys.byteorder != "big":
            packed.byteswap()
        return (packed.tostring(), tableFormat)