Kernel+AK: Separate out MACAddress and move it into AK

AK/MACAddress.h

@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <AK/Assertions.h>
+#include <AK/String.h>
+#include <AK/Types.h>
+
+class [[gnu::packed]] MACAddress
+{
+public:
+    MACAddress() {}
+    MACAddress(const u8 data[6])
+    {
+        __builtin_memcpy(m_data, data, 6);
+    }
+    MACAddress(u8 a, u8 b, u8 c, u8 d, u8 e, u8 f)
+    {
+        m_data[0] = a;
+        m_data[1] = b;
+        m_data[2] = c;
+        m_data[3] = d;
+        m_data[4] = e;
+        m_data[5] = f;
+    }
+    ~MACAddress() {}
+
+    u8 operator[](int i) const
+    {
+        ASSERT(i >= 0 && i < 6);
+        return m_data[i];
+    }
+
+    bool operator==(const MACAddress& other) const
+    {
+        return !__builtin_memcmp(m_data, other.m_data, sizeof(m_data));
+    }
+
+    String to_string() const
+    {
+        return String::format("%02x:%02x:%02x:%02x:%02x:%02x", m_data[0], m_data[1], m_data[2], m_data[3], m_data[4], m_data[5]);
+    }
+
+    bool is_zero() const
+    {
+        return m_data[0] == 0 && m_data[1] == 0 && m_data[2] == 0 && m_data[3] == 0 && m_data[4] == 0 && m_data[5] == 0;
+    }
+
+private:
+    u8 m_data[6];
+};
+
+static_assert(sizeof(MACAddress) == 6);
+
+namespace AK {
+
+template <>
+struct Traits<MACAddress> : public GenericTraits<MACAddress> {
+    static unsigned hash(const MACAddress& address) { return string_hash((const char*)&address, sizeof(address)); }
+};
+
+}