77 lines
1.7 KiB
Python
77 lines
1.7 KiB
Python
#
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# The Python Imaging Library
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# $Id$
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#
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# HDF5 stub adapter
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#
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# Copyright (c) 2000-2003 by Fredrik Lundh
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#
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# See the README file for information on usage and redistribution.
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#
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from __future__ import annotations
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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:
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"""
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Install application-specific HDF5 image handler.
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:param handler: Handler object.
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"""
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global _handler
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_handler = handler
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# --------------------------------------------------------------------
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# Image adapter
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def _accept(prefix: bytes) -> bool:
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return prefix[:8] == b"\x89HDF\r\n\x1a\n"
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class HDF5StubImageFile(ImageFile.StubImageFile):
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format = "HDF5"
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format_description = "HDF5"
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def _open(self) -> None:
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offset = self.fp.tell()
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if not _accept(self.fp.read(8)):
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msg = "Not an HDF file"
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raise SyntaxError(msg)
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self.fp.seek(offset)
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# make something up
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self._mode = "F"
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self._size = 1, 1
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loader = self._load()
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if loader:
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loader.open(self)
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def _load(self) -> ImageFile.StubHandler | None:
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return _handler
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def _save(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None:
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if _handler is None or not hasattr(_handler, "save"):
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msg = "HDF5 save handler not installed"
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raise OSError(msg)
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_handler.save(im, fp, filename)
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# --------------------------------------------------------------------
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# Registry
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Image.register_open(HDF5StubImageFile.format, HDF5StubImageFile, _accept)
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Image.register_save(HDF5StubImageFile.format, _save)
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Image.register_extensions(HDF5StubImageFile.format, [".h5", ".hdf"])
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