34 lines
1.2 KiB
JavaScript
34 lines
1.2 KiB
JavaScript
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import { PACKET_TYPES } from "./commons.js";
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export const encodePacket = ({ type, data }, supportsBinary, callback) => {
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if (data instanceof ArrayBuffer || ArrayBuffer.isView(data)) {
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return callback(supportsBinary ? data : "b" + toBuffer(data, true).toString("base64"));
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}
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// plain string
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return callback(PACKET_TYPES[type] + (data || ""));
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};
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const toBuffer = (data, forceBufferConversion) => {
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if (Buffer.isBuffer(data) ||
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(data instanceof Uint8Array && !forceBufferConversion)) {
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return data;
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}
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else if (data instanceof ArrayBuffer) {
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return Buffer.from(data);
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}
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else {
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return Buffer.from(data.buffer, data.byteOffset, data.byteLength);
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}
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};
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let TEXT_ENCODER;
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export function encodePacketToBinary(packet, callback) {
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if (packet.data instanceof ArrayBuffer || ArrayBuffer.isView(packet.data)) {
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return callback(toBuffer(packet.data, false));
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}
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encodePacket(packet, true, (encoded) => {
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if (!TEXT_ENCODER) {
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// lazily created for compatibility with Node.js 10
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TEXT_ENCODER = new TextEncoder();
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}
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callback(TEXT_ENCODER.encode(encoded));
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});
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}
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