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| from __future__ import annotations |
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| import os |
| from typing import IO |
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| from . import Image, ImageFile |
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| _handler = None |
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| def register_handler(handler: ImageFile.StubHandler | None) -> None: |
| """ |
| Install application-specific BUFR image handler. |
| |
| :param handler: Handler object. |
| """ |
| global _handler |
| _handler = handler |
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| def _accept(prefix: bytes) -> bool: |
| return prefix.startswith((b"BUFR", b"ZCZC")) |
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| class BufrStubImageFile(ImageFile.StubImageFile): |
| format = "BUFR" |
| format_description = "BUFR" |
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| def _open(self) -> None: |
| assert self.fp is not None |
| if not _accept(self.fp.read(4)): |
| msg = "Not a BUFR file" |
| raise SyntaxError(msg) |
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| self.fp.seek(-4, os.SEEK_CUR) |
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| self._mode = "F" |
| self._size = 1, 1 |
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| def _load(self) -> ImageFile.StubHandler | None: |
| return _handler |
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| 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) |
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| Image.register_open(BufrStubImageFile.format, BufrStubImageFile, _accept) |
| Image.register_save(BufrStubImageFile.format, _save) |
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| Image.register_extension(BufrStubImageFile.format, ".bufr") |
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