Started to implement server

vendor/deno.land/std@0.178.0/bytes/index_of_needle.ts

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+// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
+// This module is browser compatible.
+
+/** Returns the index of the first occurrence of the needle array in the source
+ * array, or -1 if it is not present.
+ *
+ * A start index can be specified as the third argument that begins the search
+ * at that given index. The start index defaults to the start of the array.
+ *
+ * The complexity of this function is O(source.lenth * needle.length).
+ *
+ * ```ts
+ * import { indexOfNeedle } from "https://deno.land/std@$STD_VERSION/bytes/index_of_needle.ts";
+ * const source = new Uint8Array([0, 1, 2, 1, 2, 1, 2, 3]);
+ * const needle = new Uint8Array([1, 2]);
+ * console.log(indexOfNeedle(source, needle)); // 1
+ * console.log(indexOfNeedle(source, needle, 2)); // 3
+ * ```
+ */
+export function indexOfNeedle(
+  source: Uint8Array,
+  needle: Uint8Array,
+  start = 0,
+): number {
+  if (start >= source.length) {
+    return -1;
+  }
+  if (start < 0) {
+    start = Math.max(0, source.length + start);
+  }
+  const s = needle[0];
+  for (let i = start; i < source.length; i++) {
+    if (source[i] !== s) continue;
+    const pin = i;
+    let matched = 1;
+    let j = i;
+    while (matched < needle.length) {
+      j++;
+      if (source[j] !== needle[j - pin]) {
+        break;
+      }
+      matched++;
+    }
+    if (matched === needle.length) {
+      return pin;
+    }
+  }
+  return -1;
+}