add code (non-functional)

.gitignore

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+*.exe
+saves

.vscode/settings.json

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+{
+	"deno.enable": true
+}

main.ts

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+import { Buffer } from "https://deno.land/std@0.141.0/node/buffer.ts";
+import lz4 from "npm:lz4";
+
+function decompressSave(file: Uint8Array) {
+  const buf = Buffer.from(file);
+
+  let index = 0;
+  const chunks = [];
+
+  while (index < buf.length) {
+    const magic = buf.readUIntLE(index, 4);
+    index += 4;
+
+    if (magic !== 0xfeeda1e5) {
+      console.error("Invalid Block assuming already decompressed");
+      return buf.toString("binary");
+    }
+
+    const compressedSize = buf.readUIntLE(index, 4);
+    index += 4;
+    const uncompressedSize = buf.readUIntLE(index, 4);
+    index += 4;
+
+    index += 4; // skip 4 bytes
+
+    const output = Buffer.alloc(uncompressedSize);
+    lz4.decodeBlock(buf, output, index, index + compressedSize);
+    index += compressedSize;
+
+    chunks.push(output);
+  }
+
+  return Buffer.concat(chunks).toString("binary").slice(0, -1);
+}
+
+const filePath = Deno.args[0];
+
+const file = Deno.readFileSync(filePath);
+
+const decompressedFile = decompressSave(file);
+
+Deno.writeTextFileSync('result.json', decompressedFile);