bsp.py 文件源码

def read_texture_names(self):
        """Iterate through all brush textures in the map."""
        tex_data = self.get_lump(BSP_LUMPS.TEXDATA_STRING_DATA)
        tex_table = self.get_lump(BSP_LUMPS.TEXDATA_STRING_TABLE)
        # tex_table is an array of int offsets into tex_data. tex_data is a
        # null-terminated block of strings.

        table_offsets = struct.unpack(
            # The number of ints + i, for the repetitions in the struct.
            str(len(tex_table) // struct.calcsize('i')) + 'i',
            tex_table,
        )

        for off in table_offsets:
            # Look for the NULL at the end - strings are limited to 128 chars.
            str_off = 0
            for str_off in range(off, off + 128):
                if tex_data[str_off] == 0:
                    yield tex_data[off: str_off].decode('ascii')
                    break
            else:
                # Reached the 128 char limit without finding a null.
                raise ValueError('Bad string at', off, 'in BSP! ("{}")'.format(
                    tex_data[off:str_off]
                ))