Macro getHexEx 

macro_rules! getHexEx {
    ($root:ident,$typ:ident,$slf:ident.$($x:ident).+) => { ... };
}

Get a multi-byte value from the image into a JSON object, adding the _raw terminus. The _pretty terminus has to be added by hand.

getHexEx!(root:JsonValue,image_type:String,self.path.to.bytes:[u8])