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23 lines
539 B
Racket
23 lines
539 B
Racket
#lang racket/base
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(require "racket.rkt")
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(require "utils.rkt")
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(provide (all-defined-out))
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#|
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approximates
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https://github.com/mbutterick/restructure/blob/master/src/Reserved.coffee
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|#
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(define-subclass xenomorph-base% (Reserved type [count 1])
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(define/augment (decode port parent)
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(pos port (+ (pos port) (size #f parent)))
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(void))
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(define/augment (size [val #f] [parent #f])
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(* (send type size) (resolve-length count #f parent)))
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(define/augment (encode port val [parent #f])
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(make-bytes (size val parent) 0)))
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