EVOLUTION-MANAGER

Edit File: FitsStubImagePlugin.py

#
# 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 PIL import Image, ImageFile

_handler = None

##
# Install application-specific FITS image handler.
#
# @param handler Handler object.

def register_handler(handler):
    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_extension(FITSStubImageFile.format, ".fit")
Image.register_extension(FITSStubImageFile.format, ".fits")