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# # The Python Imaging Library # $Id$ # # BUFR stub adapter # # Copyright (c) 1996-2003 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 BUFR image handler. :param handler: Handler object. """ global _handler _handler = handler # -------------------------------------------------------------------- # Image adapter def _accept(prefix): return prefix[:4] == b"BUFR" or prefix[:4] == b"ZCZC" class BufrStubImageFile(ImageFile.StubImageFile): format = "BUFR" format_description = "BUFR" def _open(self): offset = self.fp.tell() if not _accept(self.fp.read(4)): raise SyntaxError("Not a BUFR 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 OSError("BUFR save handler not installed") _handler.save(im, fp, filename) # -------------------------------------------------------------------- # Registry Image.register_open(BufrStubImageFile.format, BufrStubImageFile, _accept) Image.register_save(BufrStubImageFile.format, _save) Image.register_extension(BufrStubImageFile.format, ".bufr")