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# Source code for fabio.openimage

    """

    Authors: Henning O. Sorensen & Erik Knudsen
             Center for Fundamental Research: Metal Structures in Four Dimensions
             Risoe National Laboratory
             Frederiksborgvej 399
             DK-4000 Roskilde
             email:henning.sorensen@risoe.dk

    mods for fabio by JPW

    """
    import sys, logging
    logger = logging.getLogger("openimage")
    from fabioutils  import FilenameObject
    from fabioimage import fabioimage
    import edfimage
    import adscimage
    import tifimage
    import marccdimage
    import mar345image
    import fit2dmaskimage
    import brukerimage
    import bruker100image
    import pnmimage
    import GEimage
    import OXDimage
    import dm3image
    import HiPiCimage
    import pilatusimage
    import fit2dspreadsheetimage
    import kcdimage
    import cbfimage
    import xsdimage
    import binaryimage

    MAGIC_NUMBERS = [
        # "\42\5a" : 'bzipped'
        # "\1f\8b" : 'gzipped'
        ("FORMAT :        86" , 'bruker'),
        ("\x4d\x4d\x00\x2a"   , 'tif') ,
        # The marCCD and Pilatus formats are both standard tif with a header
        # hopefully these byte patterns are unique for the formats
        # If not the image will be read, but the is missing
        ("\x49\x49\x2a\x00\x08\x00"   , 'marccd') ,
        ("\x49\x49\x2a\x00\x82\x00"   , 'pilatus') ,
        ("\x49\x49\x2a\x00"   , 'tif') ,
        # ADSC must come before edf
        ("{\nHEA"             , 'adsc'),
        ("{"                  , 'edf'),
        ("\r{"                , 'edf'),
        ("\n{"                , 'edf'),
        ("ADEPT"              , 'GE'),
        ("OD"                 , 'OXD'),
        ("IM"                 , 'HiPiC'),
        ('\x2d\x04'           , 'mar345'),
        ('\xd2\x04'           , 'mar345'),
        ('\x04\x2d'           , 'mar345'), #some machines may need byteswapping
        ('\x04\xd2'           , 'mar345'),
        # hint : MASK in 32 bit
        ('M\x00\x00\x00A\x00\x00\x00S\x00\x00\x00K\x00\x00\x00' , 'fit2dmask') ,
        ('\x00\x00\x00\x03'   , 'dm3'),
        ("No"                 , "kcd"),
        ("<"                  , "xsd")
        ]

    def do_magic(byts):
        """ Try to interpret the bytes starting the file as a magic number """
        for magic, format_type in MAGIC_NUMBERS:
            if byts.find(magic) == 0:
                return format_type
            if 0: # debugging - bruker needed 18 bytes below
                logger.debug("m: %s f: %s", magic, format_type)
                logger.debug("bytes: %s len(bytes) %s", magic, len(magic))
                logger.debug("found: %s", byts.find(magic))
                for i in range(len(magic)):
                    logger.debug("%s %s %s %s ", ord(magic[i]), ord(byts[i]), magic[i], byts[i])
        raise Exception("Could not interpret magic string")

    def openimage(filename, frame=None):
        """ Try to open an image """
        if isinstance(filename, FilenameObject):
            try:
                logger.debug("Attempting to open %s" % (filename.tostring()))
                obj = _openimage(filename.tostring())
                logger.debug("Attempting to read frame %s from %s" % (frame,
                    filename.tostring()))
                obj = obj.read(filename.tostring(), frame)
            except Exception, ex:
                # multiframe file
                #logger.debug( "DEBUG: multiframe file, start # %d"%(
                #    filename.num)
                logger.debug("Exception %s, trying name %s" % (ex, filename.stem))
                obj = _openimage(filename.stem)
                logger.debug("Reading frame %s from %s" % (filename.num, filename.stem))
                obj.read(filename.stem, frame=filename.num)
        else:
            logger.debug("Attempting to open %s" % (filename))
            obj = _openimage(filename)
            logger.debug("Attempting to read frame %s from %s" % (frame, filename))
            obj = obj.read(filename, frame)
        return obj

    def openheader(filename):
        """ return only the header"""
        obj = _openimage(filename)
        obj.readheader(filename)
        return obj

    def _openimage(filename):
        """
        determine which format for a filename
        and return appropriate class which can be used for opening the image
        """
        try:
            imo = fabioimage()
            byts = imo._open(filename).read(18)
            filetype = do_magic(byts)
            if filetype == "marccd" and filename.find("mccd") == -1:
                # Cannot see a way around this. Need to find something
                # to distinguish mccd from regular tif...
                filetype = "tif"
        except IOError, error:
            logger.error("%s: File probably does not exist", error)
            raise error
        except:
            try:
                file_obj = FilenameObject(filename=filename)
                if file_obj == None:
                    raise Exception("Unable to deconstruct filename")
                if (file_obj.format is not None) and\
                    len(file_obj.format) != 1 and \
                    type(file_obj.format) != type(["list"]):
                    # one of OXD/ ADSC - should have got in previous
                    raise Exception("openimage failed on magic bytes & name guess")
                filetype = file_obj.format
                #UNUSED filenumber = file_obj.num
            except Exception, error:
                logger.error(error)
                import traceback
                traceback.print_exc()
                raise Exception("Fabio could not identify " + filename)
        klass_name = "".join(filetype) + 'image'
        module = sys.modules.get("fabio." + klass_name, None)
        if module is not None:
            if hasattr(module, klass_name):
                klass = getattr(module, klass_name)
            else:
                raise Exception("Module %s has no image class" % module)
        else:
            raise Exception("Filetype not known %s %s" % (filename, klass_name))
        obj = klass()
        # skip the read for read header
        return obj

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