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- #
- # The Python Imaging Library
- # $Id$
- #
- # FITS stub adapter
- #
- # Copyright (c) 1998-2003 by Fredrik Lundh
- #
- # See the README file for information on usage and redistribution.
- #
-
- from . import Image, ImageFile
-
- _handler = None
-
-
- def register_handler(handler):
- """
- Install application-specific FITS image handler.
-
- :param handler: Handler object.
- """
- global _handler
- _handler = handler
-
- # --------------------------------------------------------------------
- # Image adapter
-
-
- def _accept(prefix):
- return prefix[:6] == b"SIMPLE"
-
-
- class FITSStubImageFile(ImageFile.StubImageFile):
-
- format = "FITS"
- format_description = "FITS"
-
- def _open(self):
-
- offset = self.fp.tell()
-
- if not _accept(self.fp.read(6)):
- raise SyntaxError("Not a FITS file")
-
- # FIXME: add more sanity checks here; mandatory header items
- # include SIMPLE, BITPIX, NAXIS, etc.
-
- 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):
- return _handler
-
-
- def _save(im, fp, filename):
- if _handler is None or not hasattr("_handler", "save"):
- raise IOError("FITS save handler not installed")
- _handler.save(im, fp, filename)
-
-
- # --------------------------------------------------------------------
- # Registry
-
- Image.register_open(FITSStubImageFile.format, FITSStubImageFile, _accept)
- Image.register_save(FITSStubImageFile.format, _save)
-
- Image.register_extensions(FITSStubImageFile.format, [".fit", ".fits"])
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