[NETD-BPF#1] Move libnetdutils to framework/libs/net/...

libnetdutils is referenced by netd.c and TrafficController.cpp, which
are going to be mainlined. Therefore, move libnetdutils to a common
place where both mainline module and platform code (Netd) can refer to.

Bug: 202086915
Test: build; flash; cd system/netd; atest
No-Typo-Check: Clean code move with no other changes.
BYPASS_INCLUSIVE_LANGUAGE_REASON=Clean code move with no other changes.

Merged-In: I645bfe35f6543149c9a9f894cd4158d27a481abe
Change-Id: I645bfe35f6543149c9a9f894cd4158d27a481abe

staticlibs/netd/libnetdutils/SliceTest.cpp

@@ -0,0 +1,135 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <array>
+#include <cstdint>
+
+#include <gtest/gtest.h>
+
+#include "netdutils/Slice.h"
+#include "netdutils/Status.h"
+#include "netdutils/StatusOr.h"
+
+namespace android {
+namespace netdutils {
+
+class SliceTest : public testing::Test {
+  protected:
+    std::array<char, 256> mRaw = {};
+};
+
+TEST_F(SliceTest, smoke) {
+    Slice s1 = makeSlice(mRaw);
+    Slice s2 = makeSlice(mRaw);
+    auto p = split(s1, 14);
+    s2 = p.first; // avoid warn-unused error
+    std::stringstream ss;
+    ss << Slice();
+    EXPECT_EQ("Slice[base: 0x0, limit: 0x0, size: 0x0]", ss.str());
+    constexpr size_t kBytes = 14;
+    EXPECT_EQ(s1.base(), take(s1, kBytes).base());
+    EXPECT_EQ(kBytes, take(s1, kBytes).size());
+    EXPECT_EQ(s1.base() + kBytes, drop(s1, kBytes).base());
+    EXPECT_EQ(s1.size() - kBytes, drop(s1, kBytes).size());
+    double a = 0;
+    double b = 0;
+    int c = 0;
+    EXPECT_EQ(sizeof(a), extract(s1, a));
+    EXPECT_EQ(sizeof(a) + sizeof(b), extract(s1, a, b));
+    EXPECT_EQ(sizeof(a) + sizeof(b) + sizeof(c), extract(s1, a, b, c));
+}
+
+TEST_F(SliceTest, constructor) {
+    // Expect the following lines to compile
+    Slice s1 = makeSlice(mRaw);
+    Slice s2(s1);
+    Slice s3 = s2;
+    const Slice s4(s3);
+    const Slice s5 = s4;
+    s3 = s5;
+    Slice s6(mRaw.data(), mRaw.size());
+    Slice s7(mRaw.data(), mRaw.data() + mRaw.size());
+    struct {
+      int a;
+      double b;
+      float c;
+    } anon;
+    makeSlice(anon);
+    EXPECT_EQ(reinterpret_cast<uint8_t*>(mRaw.data()), s1.base());
+    EXPECT_EQ(reinterpret_cast<uint8_t*>(mRaw.data()) + mRaw.size(), s1.limit());
+    EXPECT_EQ(mRaw.size(), s1.size());
+    EXPECT_FALSE(mRaw.empty());
+    EXPECT_TRUE(Slice().empty());
+    EXPECT_TRUE(Slice(nullptr, static_cast<size_t>(0)).empty());
+    EXPECT_TRUE(Slice(nullptr, nullptr).empty());
+}
+
+TEST_F(SliceTest, extract) {
+    struct A {
+        int a, b;
+        bool operator==(const A& other) const { return a == other.a && b == other.b; }
+    };
+    struct B {
+        char str[12];
+        bool b;
+        int i;
+        bool operator==(const B& other) const {
+            return b == other.b && i == other.i && 0 == strncmp(str, other.str, 12);
+        }
+    };
+
+    A origA1 = {1, 2};
+    A origA2 = {3, 4};
+    B origB = {"hello world", true, 1234};
+
+    // Populate buffer for extracting.
+    Slice buffer = makeSlice(mRaw);
+    copy(buffer, makeSlice(origA1));
+    copy(drop(buffer, sizeof(origA1)), makeSlice(origB));
+    copy(drop(buffer, sizeof(origA1) + sizeof(origB)), makeSlice(origA2));
+
+    {
+        // Non-variadic extract
+        A a1{};
+        size_t len = extract(buffer, a1);
+        EXPECT_EQ(sizeof(A), len);
+        EXPECT_EQ(origA1, a1);
+    }
+
+    {
+        // Variadic extract, 2 destinations
+        A a1{};
+        B b{};
+        size_t len = extract(buffer, a1, b);
+        EXPECT_EQ(sizeof(A) + sizeof(B), len);
+        EXPECT_EQ(origA1, a1);
+        EXPECT_EQ(origB, b);
+    }
+
+    {
+        // Variadic extract, 3 destinations
+        A a1{}, a2{};
+        B b{};
+        size_t len = extract(buffer, a1, b, a2);
+        EXPECT_EQ(2 * sizeof(A) + sizeof(B), len);
+        EXPECT_EQ(origA1, a1);
+        EXPECT_EQ(origB, b);
+        EXPECT_EQ(origA2, a2);
+    }
+}
+
+}  // namespace netdutils
+}  // namespace android