Started to implement server

vendor/deno.land/std@0.191.0/io/read_int.ts

@@ -0,0 +1,16 @@
+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+
+import { type BufReader } from "./buf_reader.ts";
+import { readShort } from "./read_short.ts";
+
+/**
+ * Read big endian 32bit integer from BufReader
+ * @param buf
+ */
+export async function readInt(buf: BufReader): Promise<number | null> {
+  const high = await readShort(buf);
+  if (high === null) return null;
+  const low = await readShort(buf);
+  if (low === null) throw new Deno.errors.UnexpectedEof();
+  return (high << 16) | low;
+}