os2-header? ( object -- ? )

Vocabulary

images.bitmap

Inputs and outputs

object	an object
?	a boolean

Word description

Tests if the object is an instance of the os2-header class.

Definition

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

IN: images.bitmap

: os2-header? ( object -- ? )
    dup tuple? [
        layout-of
        dup
        7
        slot
        \ os2v1-header
        eq?
        [ drop t ]
        [
            dup
            1
            slot
            9
            fixnum>=
            [ 9 slot \ os2v2-header eq? ]
            [ drop f ]
            if
        ]
        if
    ] [ drop f ] if ;