Initial working version

2022-12-22 20:22:22 +11:00
parent ce9675a1cc
commit ced7fa5092
902 changed files with 150252 additions and 0 deletions
@@ -0,0 +1,49 @@
+import { ERROR_PACKET, PACKET_TYPES_REVERSE } from "./commons.js";
+import { decode } from "base64-arraybuffer";
+const withNativeArrayBuffer = typeof ArrayBuffer === "function";
+const decodePacket = (encodedPacket, binaryType) => {
+    if (typeof encodedPacket !== "string") {
+        return {
+            type: "message",
+            data: mapBinary(encodedPacket, binaryType)
+        };
+    }
+    const type = encodedPacket.charAt(0);
+    if (type === "b") {
+        return {
+            type: "message",
+            data: decodeBase64Packet(encodedPacket.substring(1), binaryType)
+        };
+    }
+    const packetType = PACKET_TYPES_REVERSE[type];
+    if (!packetType) {
+        return ERROR_PACKET;
+    }
+    return encodedPacket.length > 1
+        ? {
+            type: PACKET_TYPES_REVERSE[type],
+            data: encodedPacket.substring(1)
+        }
+        : {
+            type: PACKET_TYPES_REVERSE[type]
+        };
+};
+const decodeBase64Packet = (data, binaryType) => {
+    if (withNativeArrayBuffer) {
+        const decoded = decode(data);
+        return mapBinary(decoded, binaryType);
+    }
+    else {
+        return { base64: true, data }; // fallback for old browsers
+    }
+};
+const mapBinary = (data, binaryType) => {
+    switch (binaryType) {
+        case "blob":
+            return data instanceof ArrayBuffer ? new Blob([data]) : data;
+        case "arraybuffer":
+        default:
+            return data; // assuming the data is already an ArrayBuffer
+    }
+};
+export default decodePacket;