import { ERROR_PACKET , PACKET_TYPES_REVERSE , Packet , BinaryType , RawData } from "./commons.js" ; const decodePacket = ( encodedPacket , binaryType ? ) : Packet => { if ( typeof encodedPacket !== "string" ) { return { type : "message" , data : mapBinary ( encodedPacket , binaryType ) } ; } const type = encodedPacket . charAt ( 0 ) ; if ( type === "b" ) { const buffer = Buffer . from ( encodedPacket . substring ( 1 ) , "base64" ) ; return { type : "message" , data : mapBinary ( buffer , binaryType ) } ; } if ( ! PACKET_TYPES_REVERSE [ type ] ) { return ERROR_PACKET ; } return encodedPacket . length > 1 ? { type : PACKET_TYPES_REVERSE [ type ] , data : encodedPacket . substring ( 1 ) } : { type : PACKET_TYPES_REVERSE [ type ] } ; } ; const mapBinary = ( data , binaryType ? ) => { const isBuffer = Buffer . isBuffer ( data ) ; switch ( binaryType ) { case "arraybuffer" : return isBuffer ? toArrayBuffer ( data ) : data ; case "nodebuffer" : default : return data ; } } ; const toArrayBuffer = ( buffer ) : ArrayBuffer => { const arrayBuffer = new ArrayBuffer ( buffer . length ) ; const view = new Uint8Array ( arrayBuffer ) ; for ( let i = 0 ; i < buffer . length ; i ++ ) { view [ i ] = buffer [ i ] ; } return arrayBuffer ; } ; export default decodePacket ;