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

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+#
+# The Python Imaging Library
+# $Id$
+#
+# GRIB stub adapter
+#
+# Copyright (c) 1996-2003 by Fredrik Lundh
+#
+# See the README file for information on usage and redistribution.
+#
+
+from . import Image, ImageFile
+from ._binary import i8
+
+_handler = None
+
+
+def register_handler(handler):
+    """
+    Install application-specific GRIB image handler.
+
+    :param handler: Handler object.
+    """
+    global _handler
+    _handler = handler
+
+
+# --------------------------------------------------------------------
+# Image adapter
+
+def _accept(prefix):
+    return prefix[0:4] == b"GRIB" and i8(prefix[7]) == 1
+
+
+class GribStubImageFile(ImageFile.StubImageFile):
+
+    format = "GRIB"
+    format_description = "GRIB"
+
+    def _open(self):
+
+        offset = self.fp.tell()
+
+        if not _accept(self.fp.read(8)):
+            raise SyntaxError("Not a GRIB file")
+
+        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("GRIB save handler not installed")
+    _handler.save(im, fp, filename)
+
+
+# --------------------------------------------------------------------
+# Registry
+
+Image.register_open(GribStubImageFile.format, GribStubImageFile, _accept)
+Image.register_save(GribStubImageFile.format, _save)
+
+Image.register_extension(GribStubImageFile.format, ".grib")