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.
This file contains invisible Unicode characters that may be processed differently from what appears below. If your use case is intentional and legitimate, you can safely ignore this warning. Use the Escape button to reveal hidden characters.
#lang racket/base
( require " helper.rkt " " util.rkt " " number.rkt " )
( provide ( all-defined-out ) )
#|
approximates
https://github.com/mbutterick/restructure/blob/master/src/Buffer.coffee
|#
( define ( xbuffer-decode xb [ port-arg ( current-input-port ) ] #:parent [ parent #f ] )
( define port ( ->input-port port-arg ) )
( parameterize ( [ current-input-port port ] )
( define decoded-len ( resolve-length ( xbuffer-len xb ) #:parent parent ) )
( read-bytes decoded-len ) ) )
( define ( xbuffer-encode xb buf [ port-arg ( current-output-port ) ] #:parent [ parent #f ] )
( define port ( if ( output-port? port-arg ) port-arg ( open-output-bytes ) ) )
( parameterize ( [ current-output-port port ] )
( unless ( bytes? buf )
( raise-argument-error ' xbuffer-encode " bytes " buf ) )
( when ( xint? ( xbuffer-len xb ) )
( encode ( xbuffer-len xb ) ( bytes-length buf ) ) )
( write-bytes buf )
( unless port-arg ( get-output-bytes port ) ) ) )
( define ( xbuffer-size xb [ val ] #:parent [ parent #f ] )
( when val ( unless ( bytes? val )
( raise-argument-error ' xbuffer-size " bytes " val ) ) )
( finalize-size
( if ( bytes? val )
( bytes-length val )
( resolve-length ( xbuffer-len xb ) val #:parent parent ) ) ) )
( struct xbuffer ( len ) #:transparent
#:methods gen:xenomorphic
[ ( define decode xbuffer-decode )
( define encode xbuffer-encode )
( define size xbuffer-size ) ] )
( define ( +xbuffer [ len #xffff ] )
( xbuffer len ) )