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Filename : decodePacket.js
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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.decodePacket = void 0;
const commons_js_1 = require("./commons.js");
const decodePacket = (encodedPacket, binaryType) => {
    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 (!commons_js_1.PACKET_TYPES_REVERSE[type]) {
        return commons_js_1.ERROR_PACKET;
    }
    return encodedPacket.length > 1
        ? {
            type: commons_js_1.PACKET_TYPES_REVERSE[type],
            data: encodedPacket.substring(1),
        }
        : {
            type: commons_js_1.PACKET_TYPES_REVERSE[type],
        };
};
exports.decodePacket = decodePacket;
const mapBinary = (data, binaryType) => {
    switch (binaryType) {
        case "arraybuffer":
            if (data instanceof ArrayBuffer) {
                // from WebSocket & binaryType "arraybuffer"
                return data;
            }
            else if (Buffer.isBuffer(data)) {
                // from HTTP long-polling
                return data.buffer.slice(data.byteOffset, data.byteOffset + data.byteLength);
            }
            else {
                // from WebTransport (Uint8Array)
                return data.buffer;
            }
        case "nodebuffer":
        default:
            if (Buffer.isBuffer(data)) {
                // from HTTP long-polling or WebSocket & binaryType "nodebuffer" (default)
                return data;
            }
            else {
                // from WebTransport (Uint8Array)
                return Buffer.from(data);
            }
    }
};