32 lines
920 B
TypeScript
32 lines
920 B
TypeScript
import { PACKET_TYPES, Packet, RawData } from "./commons.js";
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const encodePacket = (
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{ type, data }: Packet,
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supportsBinary: boolean,
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callback: (encodedPacket: RawData) => void
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) => {
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if (data instanceof ArrayBuffer || ArrayBuffer.isView(data)) {
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const buffer = toBuffer(data);
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return callback(encodeBuffer(buffer, supportsBinary));
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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 => {
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if (Buffer.isBuffer(data)) {
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return data;
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} else if (data instanceof ArrayBuffer) {
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return Buffer.from(data);
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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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// only 'message' packets can contain binary, so the type prefix is not needed
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const encodeBuffer = (data: Buffer, supportsBinary: boolean): RawData => {
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return supportsBinary ? data : "b" + data.toString("base64");
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};
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export default encodePacket;
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