Initial commit

src/js/webworkers/background_animation_frame_emittter.worker.js

@@ -0,0 +1,16 @@
+// We clamp high deltas so 30 fps is fairly ok
+const bgFps = 30;
+const desiredMsDelay = 1000 / bgFps;
+
+let lastTick = 0;
+
+function tick() {
+    const now = performance.now();
+    const delta = now - lastTick;
+    lastTick = now;
+
+    // @ts-ignore
+    postMessage({ delta });
+}
+
+setInterval(tick, desiredMsDelay);

src/js/webworkers/compression.worker.js

@@ -0,0 +1,48 @@
+import { compressX64 } from "../core/lzstring";
+import { globalConfig } from "../core/config";
+import { sha1 } from "../core/sensitive_utils.encrypt";
+
+function accessNestedPropertyReverse(obj, keys) {
+    let result = obj;
+    for (let i = keys.length - 1; i >= 0; --i) {
+        result = result[keys[i]];
+    }
+    return result;
+}
+
+const rusha = require("rusha");
+
+const salt = accessNestedPropertyReverse(globalConfig, ["file", "info"]);
+const encryptKey = globalConfig.info.sgSalt;
+
+onmessage = function (event) {
+    const { jobId, job, data } = event.data;
+    const result = performJob(job, data);
+
+    // @ts-ignore
+    postMessage({
+        jobId,
+        result,
+    });
+};
+
+function performJob(job, data) {
+    switch (job) {
+        case "compressX64": {
+            return compressX64(data);
+        }
+        case "compressWithChecksum": {
+            const checksum = rusha
+                .createHash()
+                .update(data + encryptKey)
+                .digest("hex");
+            return compressX64(checksum + data);
+        }
+        case "compressFile": {
+            const checksum = sha1(data.text + salt);
+            return data.compressionPrefix + compressX64(checksum + data.text);
+        }
+        default:
+            throw new Error("Webworker: Unknown job: " + job);
+    }
+}