[NETD-BPF#1] Move libnetdutils to frameworks/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
Ignore-AOSP-First: the netd change(same topic) would not automerge from
aosp.
No-Typo-Check: Clean code move with no other changes.
BYPASS_INCLUSIVE_LANGUAGE_REASON=Clean code move with no other changes.
Change-Id: I645bfe35f6543149c9a9f894cd4158d27a481abe
diff --git a/staticlibs/netd/libnetdutils/MemBlockTest.cpp b/staticlibs/netd/libnetdutils/MemBlockTest.cpp
new file mode 100644
index 0000000..6455a7e
--- /dev/null
+++ b/staticlibs/netd/libnetdutils/MemBlockTest.cpp
@@ -0,0 +1,146 @@
+/*
+ * Copyright (C) 2018 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 <algorithm>
+#include <cstdint>
+#include <utility>
+
+#include <gtest/gtest.h>
+
+#include "netdutils/MemBlock.h"
+#include "netdutils/Slice.h"
+
+namespace android {
+namespace netdutils {
+
+namespace {
+
+constexpr unsigned DNS_PACKET_SIZE = 512;
+constexpr int ARBITRARY_VALUE = 0x55;
+
+MemBlock makeArbitraryMemBlock(size_t len) {
+ MemBlock result(len);
+ // Do some fictional work before returning.
+ for (Slice slice = result.get(); !slice.empty(); slice = drop(slice, 1)) {
+ slice.base()[0] = ARBITRARY_VALUE;
+ }
+ return result;
+}
+
+void checkAllZeros(Slice slice) {
+ for (; !slice.empty(); slice = drop(slice, 1)) {
+ EXPECT_EQ(0U, slice.base()[0]);
+ }
+}
+
+void checkArbitraryMemBlock(const MemBlock& block, size_t expectedSize) {
+ Slice slice = block.get();
+ EXPECT_EQ(expectedSize, slice.size());
+ EXPECT_NE(nullptr, slice.base());
+ for (; !slice.empty(); slice = drop(slice, 1)) {
+ EXPECT_EQ(ARBITRARY_VALUE, slice.base()[0]);
+ }
+}
+
+void checkHelloMello(Slice dest, Slice src) {
+ EXPECT_EQ('h', dest.base()[0]);
+ EXPECT_EQ('e', dest.base()[1]);
+ EXPECT_EQ('l', dest.base()[2]);
+ EXPECT_EQ('l', dest.base()[3]);
+ EXPECT_EQ('o', dest.base()[4]);
+
+ src.base()[0] = 'm';
+ EXPECT_EQ('h', dest.base()[0]);
+}
+
+} // namespace
+
+TEST(MemBlockTest, Empty) {
+ MemBlock empty;
+ EXPECT_TRUE(empty.get().empty());
+ EXPECT_EQ(nullptr, empty.get().base());
+}
+
+TEST(MemBlockTest, ExplicitZero) {
+ MemBlock zero(0);
+ EXPECT_TRUE(zero.get().empty());
+ EXPECT_EQ(nullptr, zero.get().base());
+}
+
+TEST(MemBlockTest, BasicAllocation) {
+ MemBlock dnsPacket(DNS_PACKET_SIZE);
+ Slice slice = dnsPacket.get();
+ EXPECT_EQ(DNS_PACKET_SIZE, slice.size());
+ // Verify the space is '\0'-initialized.
+ ASSERT_NO_FATAL_FAILURE(checkAllZeros(slice));
+ EXPECT_NE(nullptr, slice.base());
+}
+
+TEST(MemBlockTest, MoveConstruction) {
+ MemBlock block(makeArbitraryMemBlock(DNS_PACKET_SIZE));
+ ASSERT_NO_FATAL_FAILURE(checkArbitraryMemBlock(block, DNS_PACKET_SIZE));
+}
+
+TEST(MemBlockTest, MoveAssignmentOrConstruction) {
+ MemBlock block = makeArbitraryMemBlock(DNS_PACKET_SIZE);
+ ASSERT_NO_FATAL_FAILURE(checkArbitraryMemBlock(block, DNS_PACKET_SIZE));
+}
+
+TEST(MemBlockTest, StdMoveAssignment) {
+ constexpr unsigned SIZE = 10;
+
+ MemBlock block;
+ EXPECT_TRUE(block.get().empty());
+ EXPECT_EQ(nullptr, block.get().base());
+
+ {
+ MemBlock block2 = makeArbitraryMemBlock(SIZE);
+ EXPECT_EQ(SIZE, block2.get().size());
+ // More fictional work.
+ for (unsigned i = 0; i < SIZE; i++) {
+ block2.get().base()[i] = i;
+ }
+ block = std::move(block2);
+ }
+
+ EXPECT_EQ(SIZE, block.get().size());
+ for (unsigned i = 0; i < SIZE; i++) {
+ EXPECT_EQ(i, block.get().base()[i]);
+ }
+}
+
+TEST(MemBlockTest, ConstructionFromSlice) {
+ uint8_t data[] = {'h', 'e', 'l', 'l', 'o'};
+ Slice dataSlice(Slice(data, sizeof(data) / sizeof(data[0])));
+
+ MemBlock dataCopy(dataSlice);
+ ASSERT_NO_FATAL_FAILURE(checkHelloMello(dataCopy.get(), dataSlice));
+}
+
+TEST(MemBlockTest, ImplicitCastToSlice) {
+ uint8_t data[] = {'h', 'e', 'l', 'l', 'o'};
+ Slice dataSlice(Slice(data, sizeof(data) / sizeof(data[0])));
+
+ MemBlock dataCopy(dataSlice.size());
+ // NOTE: no explicit MemBlock::get().
+ // Verify the space is '\0'-initialized.
+ ASSERT_NO_FATAL_FAILURE(checkAllZeros(dataCopy));
+ copy(dataCopy, dataSlice);
+ ASSERT_NO_FATAL_FAILURE(checkHelloMello(dataCopy, dataSlice));
+}
+
+} // namespace netdutils
+} // namespace android