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