base: Use compiler builtins for byte swapping

base/sys_byteorder_unittest.cc

Index: base/sys_byteorder_unittest.cc
diff --git a/base/sys_byteorder_unittest.cc b/base/sys_byteorder_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0352c2a97c628e91c988ed6febc6556cbf43b3e2
--- /dev/null
+++ b/base/sys_byteorder_unittest.cc
@@ -0,0 +1,122 @@
+// Copyright (c) 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/sys_byteorder.h"
+
+#include <stdint.h>
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+const uint16_t k16BitTestData = 0xaabb;
+const uint16_t k16BitSwappedTestData = 0xbbaa;
+const uint32_t k32BitTestData = 0xaabbccdd;
+const uint32_t k32BitSwappedTestData = 0xddccbbaa;
+const uint64_t k64BitTestData = 0xaabbccdd44332211;
+const uint64_t k64BitSwappedTestData = 0x11223344ddccbbaa;
+
+}  // namespace
+
+TEST(ByteOrderTest, ByteSwap16) {
+  uint16_t swapped = base::ByteSwap(k16BitTestData);
+  EXPECT_EQ(k16BitSwappedTestData, swapped);
+  uint16_t reswapped = base::ByteSwap(swapped);
+  EXPECT_EQ(k16BitTestData, reswapped);
+}
+
+TEST(ByteOrderTest, ByteSwap32) {
+  uint32_t swapped = base::ByteSwap(k32BitTestData);
+  EXPECT_EQ(k32BitSwappedTestData, swapped);
+  uint32_t reswapped = base::ByteSwap(swapped);
+  EXPECT_EQ(k32BitTestData, reswapped);
+}
+
+TEST(ByteOrderTest, ByteSwap64) {
+  uint64_t swapped = base::ByteSwap(k64BitTestData);
+  EXPECT_EQ(k64BitSwappedTestData, swapped);
+  uint64_t reswapped = base::ByteSwap(swapped);
+  EXPECT_EQ(k64BitTestData, reswapped);
+}
+
+TEST(ByteOrderTest, ByteSwapToLE16) {
+  uint16_t le = base::ByteSwapToLE16(k16BitTestData);
+#if defined(ARCH_CPU_LITTLE_ENDIAN)
+  EXPECT_EQ(k16BitTestData, le);
+#else
+  EXPECT_EQ(k16BitSwappedTestData, le);
+#endif
+}
+
+TEST(ByteOrderTest, ByteSwapToLE32) {
+  uint32_t le = base::ByteSwapToLE32(k32BitTestData);
+#if defined(ARCH_CPU_LITTLE_ENDIAN)
+  EXPECT_EQ(k32BitTestData, le);
+#else
+  EXPECT_EQ(k32BitSwappedTestData, le);
+#endif
+}
+
+TEST(ByteOrderTest, ByteSwapToLE64) {
+  uint64_t le = base::ByteSwapToLE64(k64BitTestData);
+#if defined(ARCH_CPU_LITTLE_ENDIAN)
+  EXPECT_EQ(k64BitTestData, le);
+#else
+  EXPECT_EQ(k64BitSwappedTestData, le);
+#endif
+}
+
+TEST(ByteOrderTest, NetToHost16) {
+  uint16_t h = base::NetToHost16(k16BitTestData);
+#if defined(ARCH_CPU_LITTLE_ENDIAN)
+  EXPECT_EQ(k16BitSwappedTestData, h);
+#else
+  EXPECT_EQ(k16BitTestData, h);
+#endif
+}
+
+TEST(ByteOrderTest, NetToHost32) {
+  uint32_t h = base::NetToHost32(k32BitTestData);
+#if defined(ARCH_CPU_LITTLE_ENDIAN)
+  EXPECT_EQ(k32BitSwappedTestData, h);
+#else
+  EXPECT_EQ(k32BitTestData, h);
+#endif
+}
+
+TEST(ByteOrderTest, NetToHost64) {
+  uint64_t h = base::NetToHost64(k64BitTestData);
+#if defined(ARCH_CPU_LITTLE_ENDIAN)
+  EXPECT_EQ(k64BitSwappedTestData, h);
+#else
+  EXPECT_EQ(k64BitTestData, h);
+#endif
+}
+
+TEST(ByteOrderTest, HostToNet16) {
+  uint16_t n = base::HostToNet16(k16BitTestData);
+#if defined(ARCH_CPU_LITTLE_ENDIAN)
+  EXPECT_EQ(k16BitSwappedTestData, n);
+#else
+  EXPECT_EQ(k16BitTestData, n);
+#endif
+}
+
+TEST(ByteOrderTest, HostToNet32) {
+  uint32_t n = base::HostToNet32(k32BitTestData);
+#if defined(ARCH_CPU_LITTLE_ENDIAN)
+  EXPECT_EQ(k32BitSwappedTestData, n);
+#else
+  EXPECT_EQ(k32BitTestData, n);
+#endif
+}
+
+TEST(ByteOrderTest, HostToNet64) {
+  uint64_t n = base::HostToNet64(k64BitTestData);
+#if defined(ARCH_CPU_LITTLE_ENDIAN)
+  EXPECT_EQ(k64BitSwappedTestData, n);
+#else
+  EXPECT_EQ(k64BitTestData, n);
+#endif
+}