read-union-footer ( -- footer-offset footer )

Vocabulary

tools.image

Inputs

None

Outputs

footer-offset	an integer
footer	an embedded-image-footer.union

Word description

read the footer at given offset from beginning of file. Reads footer from end of file, while returning to current file position. Also returns offset to footer from beginning of file.

Definition

USING: classes.struct io kernel math ;

IN: tools.image

: read-union-footer ( -- footer-offset footer )
    [
        embedded-image-footer.union
        [ struct-size neg seek-end seek-input tell-input ]
        [ read-struct* ] bi
    ] with-position ;