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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 PIL import Image, ImageFile
_handler = None
##
# Install application-specific GRIB image handler.
#
# @param handler Handler object.
def register_handler(handler):
global _handler
_handler = handler
# --------------------------------------------------------------------
# Image adapter
def _accept(prefix):
return prefix[0:4] == b"GRIB" and prefix[7] == b'\x01'
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")