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41 lines
1.2 KiB
Racket
41 lines
1.2 KiB
Racket
#lang restructure/racket
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(require "number.rkt" "utils.rkt" "stream.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/Buffer.coffee
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|#
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(define-subclass RestructureBase (Buffer [_length #xffff])
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(define/override (decode stream [parent #f])
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(define len (resolveLength _length stream parent))
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(send stream readBuffer len))
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(define/override (size [val #f] [parent #f])
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(when val (unless (bytes? val)
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(raise-argument-error 'Buffer:size "bytes" val)))
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(if val
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(bytes-length val)
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(resolveLength _length val parent)))
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(define/override (encode stream buf [parent #f])
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(when (Number? _length)
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(send _length encode stream (bytes-length buf)))
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(send stream writeBuffer buf)))
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(define (bytes->Buffer bstr)
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(define b (+Buffer (bytes-length bstr)))
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(send b decode (+DecodeStream bstr))
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b)
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#;(test-module
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(require "stream.rkt")
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(define stream (+DecodeStream #"\2BCDEF"))
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(define S (+String uint8 'utf8))
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(check-equal? (send S decode stream) "BC")
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(define os (+EncodeStream))
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(send S encode os "Mike")
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(check-equal? (send os dump) #"\4Mike")
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(check-equal? (send (+String) size "foobar") 6)) |