59 lines
1.3 KiB
TypeScript
59 lines
1.3 KiB
TypeScript
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import { decodeText, encodeText } from "./byte_util";
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import { Bytes } from "./rtmt";
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const headerLenght = 4
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export type Message = {
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channel : string,
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data : Bytes,
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}
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//
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// channel is string, message is byte array
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//
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export function encode(message : Message) {
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const {channel, data} = message
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const channelLenght = channel.length
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const messageLenght = data.length
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const totalLenght = headerLenght + channelLenght + messageLenght
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const buffer = new ArrayBuffer(totalLenght);
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const view = new DataView(buffer);
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view.setUint32(0, channelLenght);
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const channelBytes = encodeText(channel)
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let count = headerLenght
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channelBytes.forEach((byte : any)=>{
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view.setUint8(count, byte)
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count++
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})
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for (const byte of data) {
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view.setUint8(count, byte)
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count++
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}
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return buffer
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}
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//
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// return { channel : string, message : byte array}
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//
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export function decode(bytes : Bytes) : Message {
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const view = new DataView(bytes.buffer);
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const channelLenght = view.getUint32(0)
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const channel = decodeText(
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bytes.slice(headerLenght, headerLenght + channelLenght))
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const message = bytes.slice(headerLenght + channelLenght)
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return {
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"channel": channel,
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"data": message,
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}
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}
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