image-header? ( object -- ? )

Vocabulary

tools.image

Inputs and outputs

object	an object
?	a boolean

Word description

Tests if the object is an instance of the image-header class.

Definition

USING: classes.tuple.private kernel kernel.private math.private
slots.private ;

IN: tools.image

: image-header? ( object -- ? )
    dup tag 1 eq?
    [ drop t ] [
        dup
        tuple?
        [
            layout-of
            dup
            1
            slot
            9
            fixnum>=
            [
                9
                slot
                dup
                \ image-header.64
                eq?
                [ drop t ]
                [ \ image-header.32 eq? ]
                if
            ]
            [ drop f ]
            if
        ]
        [ drop f ]
        if
    ] if ;