You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
36 lines
1.1 KiB
Racket
36 lines
1.1 KiB
Racket
8 years ago
|
#lang restructure/racket
|
||
|
|
(require "number.rkt" "utils.rkt")
|
||
|
|
(provide (all-defined-out))
|
||
|
|
|
||
|
|
#|
|
||
|
|
approximates
|
||
|
|
https://github.com/mbutterick/restructure/blob/master/src/Buffer.coffee
|
||
|
|
|#
|
||
|
|
|
||
|
|
(define-subclass RestructureBase (Buffer [_length #f])
|
||
|
|
(define/override (decode stream [parent #f])
|
||
|
|
(define len (resolveLength _length stream parent))
|
||
|
|
(send stream readBuffer len))
|
||
|
|
|
||
|
|
(define/override (size [val #f] [parent #f])
|
||
|
|
(when val (unless (bytes? val)
|
||
|
|
(raise-argument-error 'Buffer:size "bytes" val)))
|
||
|
|
(if val
|
||
|
|
(bytes-length val)
|
||
|
|
(resolveLength _length val parent)))
|
||
|
|
|
||
|
|
(define/override (encode stream buf parent)
|
||
|
|
(when (Number? _length)
|
||
|
|
(send _length encode stream (bytes-length buf)))
|
||
|
|
(send stream writeBuffer buf)))
|
||
|
|
|
||
|
|
|
||
|
|
#;(test-module
|
||
|
|
(require "stream.rkt")
|
||
|
|
(define stream (+DecodeStream #"\2BCDEF"))
|
||
|
|
(define S (+String uint8 'utf8))
|
||
|
|
(check-equal? (send S decode stream) "BC")
|
||
|
|
(define os (+EncodeStream))
|
||
|
|
(send S encode os "Mike")
|
||
|
|
(check-equal? (send os dump) #"\4Mike")
|
||
|
|
(check-equal? (send (+String) size "foobar") 6))
|