1 files changed, 29 insertions, 0 deletions
diff --git a/third_party/libwebrtc/net/dcsctp/packet/crc32c.cc b/third_party/libwebrtc/net/dcsctp/packet/crc32c.cc
new file mode 100644
index 0000000000..e3f0dc1d19
--- /dev/null
+++ b/third_party/libwebrtc/net/dcsctp/packet/crc32c.cc
@@ -0,0 +1,29 @@
+/*
+ *  Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+#include "net/dcsctp/packet/crc32c.h"
+
+#include <cstdint>
+
+#include "third_party/crc32c/src/include/crc32c/crc32c.h"
+
+namespace dcsctp {
+
+uint32_t GenerateCrc32C(rtc::ArrayView<const uint8_t> data) {
+  uint32_t crc32c = crc32c_value(data.data(), data.size());
+
+  // Byte swapping for little endian byte order:
+  uint8_t byte0 = crc32c;
+  uint8_t byte1 = crc32c >> 8;
+  uint8_t byte2 = crc32c >> 16;
+  uint8_t byte3 = crc32c >> 24;
+  crc32c = ((byte0 << 24) | (byte1 << 16) | (byte2 << 8) | byte3);
+  return crc32c;
+}
+}  // namespace dcsctp