Source code for PIL.BufrStubImagePlugin

#
# The Python Imaging Library
# $Id$
#
# BUFR stub adapter
#
# Copyright (c) 1996-2003 by Fredrik Lundh
#
# See the README file for information on usage and redistribution.
#
from __future__ import annotations

from typing import IO

from . import Image, ImageFile

_handler = None


[docs] def register_handler(handler: ImageFile.StubHandler | None) -> None: """ Install application-specific BUFR image handler. :param handler: Handler object. """ global _handler _handler = handler
# -------------------------------------------------------------------- # Image adapter def _accept(prefix: bytes) -> bool: return prefix[:4] == b"BUFR" or prefix[:4] == b"ZCZC"
[docs] class BufrStubImageFile(ImageFile.StubImageFile): format = "BUFR" format_description = "BUFR" def _open(self) -> None: offset = self.fp.tell() if not _accept(self.fp.read(4)): msg = "Not a BUFR file" raise SyntaxError(msg) self.fp.seek(offset) # make something up self._mode = "F" self._size = 1, 1 loader = self._load() if loader: loader.open(self) def _load(self) -> ImageFile.StubHandler | None: return _handler
def _save(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None: if _handler is None or not hasattr(_handler, "save"): msg = "BUFR save handler not installed" raise OSError(msg) _handler.save(im, fp, filename) # -------------------------------------------------------------------- # Registry Image.register_open(BufrStubImageFile.format, BufrStubImageFile, _accept) Image.register_save(BufrStubImageFile.format, _save) Image.register_extension(BufrStubImageFile.format, ".bufr")