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Editing: GribStubImagePlugin.py

#
# 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

_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[:4] == b"GRIB" and 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)):
            msg = "Not a GRIB file"
            raise SyntaxError(msg)

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"):
        msg = "GRIB save handler not installed"
        raise OSError(msg)
    _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")

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