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77 lines
1.6 KiB
Python
77 lines
1.6 KiB
Python
#
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# The Python Imaging Library
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# $Id$
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#
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# FITS stub adapter
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#
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# Copyright (c) 1998-2003 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 . import Image, ImageFile
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_handler = None
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def register_handler(handler):
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"""
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Install application-specific FITS 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):
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return prefix[:6] == b"SIMPLE"
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class FITSStubImageFile(ImageFile.StubImageFile):
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format = "FITS"
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format_description = "FITS"
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def _open(self):
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offset = self.fp.tell()
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if not _accept(self.fp.read(6)):
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raise SyntaxError("Not a FITS file")
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# FIXME: add more sanity checks here; mandatory header items
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# include SIMPLE, BITPIX, NAXIS, etc.
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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):
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return _handler
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def _save(im, fp, filename):
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if _handler is None or not hasattr("_handler", "save"):
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raise IOError("FITS save handler not installed")
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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(FITSStubImageFile.format, FITSStubImageFile, _accept)
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Image.register_save(FITSStubImageFile.format, _save)
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Image.register_extension(FITSStubImageFile.format, ".fit")
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Image.register_extension(FITSStubImageFile.format, ".fits")
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