--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CSP2/CSP2_env/env-d9b9114564458d9d-741b3de822f2aaca6c6caa4325c4afce/include/kj/cidr.h	Tue Mar 18 17:55:14 2025 -0400
@@ -0,0 +1,62 @@
+
+// Copyright (c) 2013-2014 Sandstorm Development Group, Inc. and contributors
+// Licensed under the MIT License:
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#pragma once
+
+#include "common.h"
+#include <cstdint>
+
+KJ_BEGIN_HEADER
+
+struct sockaddr;
+
+namespace kj {
+
+class CidrRange {
+public:
+  CidrRange(StringPtr pattern);
+
+  static CidrRange inet4(ArrayPtr<const byte> bits, uint bitCount);
+  static CidrRange inet6(ArrayPtr<const uint16_t> prefix, ArrayPtr<const uint16_t> suffix,
+                         uint bitCount);
+  // Zeros are inserted between `prefix` and `suffix` to extend the address to 128 bits.
+
+  uint getSpecificity() const { return bitCount; }
+
+  bool matches(const struct sockaddr* addr) const;
+  bool matchesFamily(int family) const;
+
+  String toString() const;
+
+private:
+  int family;
+  byte bits[16];
+  uint bitCount;    // how many bits in `bits` need to match
+
+  CidrRange(int family, ArrayPtr<const byte> bits, uint bitCount);
+
+  void zeroIrrelevantBits();
+};
+
+}  // namespace kj
+
+KJ_END_HEADER