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projecten1/lib/python3.6/site-packages/PIL/FitsStubImagePlugin.py

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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"])