1 files changed, 35 insertions, 0 deletions
diff --git a/include/wireframe/net/udp.hpp b/include/wireframe/net/udp.hpp
new file mode 100644
index 0000000..07664c2
--- /dev/null
+++ b/include/wireframe/net/udp.hpp
@@ -0,0 +1,35 @@
+#pragma once
+
+#include <cstdint>
+#include <optional>
+#include <span>
+
+#include "wireframe/byteio.hpp"
+
+namespace wireframe::net {
+
+inline constexpr std::size_t kUdpHeaderLen = 8;
+
+struct UdpHeader {
+    std::uint16_t src_port;
+    std::uint16_t dst_port;
+    std::uint16_t length;
+};
+
+struct UdpDatagram {
+    UdpHeader header;
+    std::span<const unsigned char> payload;
+};
+
+inline std::optional<UdpDatagram> parse_udp(std::span<const unsigned char> bytes) {
+    if (bytes.size() < kUdpHeaderLen) return std::nullopt;
+
+    UdpHeader header{};
+    header.src_port = read_be16(bytes, 0);
+    header.dst_port = read_be16(bytes, 2);
+    header.length = read_be16(bytes, 4);
+
+    return UdpDatagram{header, bytes.subspan(kUdpHeaderLen)};
+}
+
+}  // namespace wireframe::net