Last change
on this file since 6c1585f was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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Property mode
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100644
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File size:
1.3 KB
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[6a3a178] | 1 | const { PACKET_TYPES_REVERSE, ERROR_PACKET } = require("./commons");
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| 2 |
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| 3 | const decodePacket = (encodedPacket, binaryType) => {
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| 4 | if (typeof encodedPacket !== "string") {
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| 5 | return {
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| 6 | type: "message",
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| 7 | data: mapBinary(encodedPacket, binaryType)
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| 8 | };
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| 9 | }
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| 10 | const type = encodedPacket.charAt(0);
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| 11 | if (type === "b") {
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| 12 | const buffer = Buffer.from(encodedPacket.substring(1), "base64");
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| 13 | return {
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| 14 | type: "message",
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| 15 | data: mapBinary(buffer, binaryType)
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| 16 | };
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| 17 | }
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| 18 | if (!PACKET_TYPES_REVERSE[type]) {
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| 19 | return ERROR_PACKET;
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| 20 | }
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| 21 | return encodedPacket.length > 1
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| 22 | ? {
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| 23 | type: PACKET_TYPES_REVERSE[type],
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| 24 | data: encodedPacket.substring(1)
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| 25 | }
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| 26 | : {
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| 27 | type: PACKET_TYPES_REVERSE[type]
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| 28 | };
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| 29 | };
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| 30 |
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| 31 | const mapBinary = (data, binaryType) => {
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| 32 | const isBuffer = Buffer.isBuffer(data);
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| 33 | switch (binaryType) {
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| 34 | case "arraybuffer":
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| 35 | return isBuffer ? toArrayBuffer(data) : data;
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| 36 | case "nodebuffer":
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| 37 | default:
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| 38 | return data; // assuming the data is already a Buffer
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| 39 | }
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| 40 | };
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| 41 |
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| 42 | const toArrayBuffer = buffer => {
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| 43 | const arrayBuffer = new ArrayBuffer(buffer.length);
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| 44 | const view = new Uint8Array(arrayBuffer);
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| 45 | for (let i = 0; i < buffer.length; i++) {
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| 46 | view[i] = buffer[i];
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| 47 | }
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| 48 | return arrayBuffer;
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| 49 | };
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| 50 |
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| 51 | module.exports = decodePacket;
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