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56 lines
1.6 KiB
Racket
56 lines
1.6 KiB
Racket
#lang racket/base
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(require "racket.rkt")
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(require "number.rkt" "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/Buffer.coffee
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|#
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#|
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A Buffer is a container object for any data object that supports random access
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A Node Buffer object is basically a byte string.
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First argument must be a string, Buffer, ArrayBuffer, Array, or array-like object.
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A Restructure RBuffer object is separate.
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|#
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(define (+Buffer xs [type #f])
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((if (string? xs)
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string->bytes/utf-8
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list->bytes) xs))
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(define-subclass xenomorph-base% (RBuffer [len #xffff])
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(define/augment (decode port [parent #f])
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(define decoded-len (resolve-length len port parent))
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(read-bytes decoded-len port))
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(define/augment (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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(resolve-length len val parent)))
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(define/augment (encode port buf [parent #f])
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(unless (bytes? buf)
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(raise-argument-error 'Buffer:encode "bytes" buf))
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(define op (or port (open-output-bytes)))
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(when (NumberT? len)
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(send len encode op (length buf)))
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(write-bytes buf op)
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(unless port (get-output-bytes op))))
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(define-subclass RBuffer (BufferT))
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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)) |