feat: 更新WebSocket 优化逻辑

Signed-off-by: MiaoWoo <admin@yumc.pw>

packages/websocket/src/engine.io-parser/decodePacket.ts

@@ -0,0 +1,48 @@
+const { PACKET_TYPES_REVERSE, ERROR_PACKET } = require("./commons")
+
+export 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 (!PACKET_TYPES_REVERSE[type]) {
+        return ERROR_PACKET
+    }
+    return encodedPacket.length > 1
+        ? {
+            type: PACKET_TYPES_REVERSE[type],
+            data: encodedPacket.substring(1)
+        }
+        : {
+            type: PACKET_TYPES_REVERSE[type]
+        }
+}
+
+const mapBinary = (data, binaryType) => {
+    switch (binaryType) {
+        case "arraybuffer":
+            return Buffer.isBuffer(data) ? toArrayBuffer(data) : data
+        case "nodebuffer":
+        default:
+            return data // assuming the data is already a Buffer
+    }
+}
+
+const toArrayBuffer = buffer => {
+    const arrayBuffer = new ArrayBuffer(buffer.length)
+    const view = new Uint8Array(arrayBuffer)
+    for (let i = 0; i < buffer.length; i++) {
+        view[i] = buffer[i]
+    }
+    return arrayBuffer
+}