import gzip, FuseArchive

class Serializer:
    """This lets us experiment with different main file serializers"""
    @staticmethod
    def dump( f, obj ):
        out = FuseArchiveStream.open( f, "wb" )
        Serializer.dumpfh( obj, out ) # new file format
        out.close()

    @staticmethod
    def dumpfh( fh, obj ):
        logging.debug( "Going to serialize %s to %s" % ( obj, fh ) )
        fh.truncate( 0 )
        fh.seek( 0 )
        f = gzip.GzipFile( None, "wb", gzip_compress_level, fh )
        #f = fh
        cPickle.dump( obj, f, -1 )
        del f
        fh.flush()

    @staticmethod
    def load( f ):
        if FuseArchive.magic_profiling:
            return { 'size': 0, 'chunks': 0, 'chunk_size': 0 }

        inp = open( f, "rb" )
        magic = Serializer.loadfh( inp )
        inp.close()
        return magic

    @staticmethod
    def loadfh( fh ):
        logging.debug( "Going to load from %s" % fh )
        fh.seek( 0 )
        f = gzip.GzipFile( None, "rb", gzip_compress_level, fh )
        #f = fh
        magic = cPickle.load( f )
        return( magic )