libs/binder/tests/binderParcelUnitTest.cpp - LeafOS-Project/android_frameworks_native - Gitiles

 /*
  * Copyright (C) 2020 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 <binder/IPCThreadState.h>
 #include <binder/Parcel.h>
 #include <binder/Status.h>
 #include <cutils/ashmem.h>
 #include <gtest/gtest.h>

 using android::BBinder;
 using android::IBinder;
 using android::IPCThreadState;
 using android::OK;
 using android::Parcel;
 using android::sp;
 using android::status_t;
 using android::String16;
 using android::String8;
 using android::binder::Status;
 using android::binder::unique_fd;

 TEST(Parcel, NonNullTerminatedString8) {
     String8 kTestString = String8("test-is-good");

     // write non-null terminated string
     Parcel p;
     p.writeString8(kTestString);
     p.setDataPosition(0);
     // BAD! assumption of wire format for test
     // write over length of string
     p.writeInt32(kTestString.size() - 2);

     p.setDataPosition(0);
     String8 output;
     EXPECT_NE(OK, p.readString8(&output));
     EXPECT_EQ(output.size(), 0);
 }

 TEST(Parcel, NonNullTerminatedString16) {
     String16 kTestString = String16("test-is-good");

     // write non-null terminated string
     Parcel p;
     p.writeString16(kTestString);
     p.setDataPosition(0);
     // BAD! assumption of wire format for test
     // write over length of string
     p.writeInt32(kTestString.size() - 2);

     p.setDataPosition(0);
     String16 output;
     EXPECT_NE(OK, p.readString16(&output));
     EXPECT_EQ(output.size(), 0);
 }

 TEST(Parcel, EnforceNoDataAvail) {
     const int32_t kTestInt = 42;
     const String8 kTestString = String8("test-is-good");
     Parcel p;
     p.writeInt32(kTestInt);
     p.writeString8(kTestString);
     p.setDataPosition(0);
     EXPECT_EQ(kTestInt, p.readInt32());
     EXPECT_EQ(p.enforceNoDataAvail().exceptionCode(), Status::Exception::EX_BAD_PARCELABLE);
     EXPECT_EQ(kTestString, p.readString8());
     EXPECT_EQ(p.enforceNoDataAvail().exceptionCode(), Status::Exception::EX_NONE);
 }

 TEST(Parcel, DebugReadAllBinders) {
     sp<IBinder> binder1 = sp<BBinder>::make();
     sp<IBinder> binder2 = sp<BBinder>::make();

     Parcel p;
     p.writeInt32(4);
     p.writeStrongBinder(binder1);
     p.writeStrongBinder(nullptr);
     p.writeInt32(4);
     p.writeStrongBinder(binder2);
     p.writeInt32(4);

     auto ret = p.debugReadAllStrongBinders();

     ASSERT_EQ(ret.size(), 2);
     EXPECT_EQ(ret[0], binder1);
     EXPECT_EQ(ret[1], binder2);
 }

 TEST(Parcel, DebugReadAllFds) {
     Parcel p;
     p.writeInt32(4);
     p.writeFileDescriptor(STDOUT_FILENO, false /*takeOwnership*/);
     p.writeInt32(4);
     p.writeFileDescriptor(STDIN_FILENO, false /*takeOwnership*/);
     p.writeInt32(4);

     auto ret = p.debugReadAllFileDescriptors();

     ASSERT_EQ(ret.size(), 2);
     EXPECT_EQ(ret[0], STDOUT_FILENO);
     EXPECT_EQ(ret[1], STDIN_FILENO);
 }

 TEST(Parcel, AppendFromEmpty) {
     Parcel p1;
     Parcel p2;
     p2.writeInt32(2);

     ASSERT_EQ(OK, p1.appendFrom(&p2, 0, p2.dataSize()));

     p1.setDataPosition(0);
     ASSERT_EQ(2, p1.readInt32());

     p2.setDataPosition(0);
     ASSERT_EQ(2, p2.readInt32());
 }

 TEST(Parcel, AppendPlainData) {
     Parcel p1;
     p1.writeInt32(1);
     Parcel p2;
     p2.writeInt32(2);

     ASSERT_EQ(OK, p1.appendFrom(&p2, 0, p2.dataSize()));

     p1.setDataPosition(0);
     ASSERT_EQ(1, p1.readInt32());
     ASSERT_EQ(2, p1.readInt32());

     p2.setDataPosition(0);
     ASSERT_EQ(2, p2.readInt32());
 }

 TEST(Parcel, AppendPlainDataPartial) {
     Parcel p1;
     p1.writeInt32(1);
     Parcel p2;
     p2.writeInt32(2);
     p2.writeInt32(3);
     p2.writeInt32(4);

     // only copy 8 bytes (two int32's worth)
     ASSERT_EQ(OK, p1.appendFrom(&p2, 0, 8));

     p1.setDataPosition(0);
     ASSERT_EQ(1, p1.readInt32());
     ASSERT_EQ(2, p1.readInt32());
     ASSERT_EQ(3, p1.readInt32());
     ASSERT_EQ(0, p1.readInt32()); // not 4, end of Parcel

     p2.setDataPosition(0);
     ASSERT_EQ(2, p2.readInt32());
 }

 TEST(Parcel, AppendWithBinder) {
     sp<IBinder> b1 = sp<BBinder>::make();
     sp<IBinder> b2 = sp<BBinder>::make();

     Parcel p1;
     p1.writeInt32(1);
     p1.writeStrongBinder(b1);
     Parcel p2;
     p2.writeInt32(2);
     p2.writeStrongBinder(b2);

     ASSERT_EQ(OK, p1.appendFrom(&p2, 0, p2.dataSize()));

     p1.setDataPosition(0);
     ASSERT_EQ(1, p1.readInt32());
     ASSERT_EQ(b1, p1.readStrongBinder());
     ASSERT_EQ(2, p1.readInt32());
     ASSERT_EQ(b2, p1.readStrongBinder());
     ASSERT_EQ(2, p1.objectsCount());

     p2.setDataPosition(0);
     ASSERT_EQ(2, p2.readInt32());
     ASSERT_EQ(b2, p2.readStrongBinder());
 }

 TEST(Parcel, AppendWithBinderPartial) {
     sp<IBinder> b1 = sp<BBinder>::make();
     sp<IBinder> b2 = sp<BBinder>::make();

     Parcel p1;
     p1.writeInt32(1);
     p1.writeStrongBinder(b1);
     Parcel p2;
     p2.writeInt32(2);
     p2.writeStrongBinder(b2);

     ASSERT_EQ(OK, p1.appendFrom(&p2, 0, 8)); // BAD: 4 bytes into strong binder

     p1.setDataPosition(0);
     ASSERT_EQ(1, p1.readInt32());
     ASSERT_EQ(b1, p1.readStrongBinder());
     ASSERT_EQ(2, p1.readInt32());
     ASSERT_EQ(1935813253, p1.readInt32()); // whatever garbage that is there (ABI)
     ASSERT_EQ(1, p1.objectsCount());

     p2.setDataPosition(0);
     ASSERT_EQ(2, p2.readInt32());
     ASSERT_EQ(b2, p2.readStrongBinder());
 }

 TEST(Parcel, AppendWithFd) {
     unique_fd fd1 = unique_fd(dup(0));
     unique_fd fd2 = unique_fd(dup(0));

     Parcel p1;
     p1.writeInt32(1);
     p1.writeDupFileDescriptor(0);      // with ownership
     p1.writeFileDescriptor(fd1.get()); // without ownership
     Parcel p2;
     p2.writeInt32(2);
     p2.writeDupFileDescriptor(0);      // with ownership
     p2.writeFileDescriptor(fd2.get()); // without ownership

     ASSERT_EQ(OK, p1.appendFrom(&p2, 0, p2.dataSize()));

     p1.setDataPosition(0);
     ASSERT_EQ(1, p1.readInt32());
     ASSERT_NE(-1, p1.readFileDescriptor());
     ASSERT_NE(-1, p1.readFileDescriptor());
     ASSERT_EQ(2, p1.readInt32());
     ASSERT_NE(-1, p1.readFileDescriptor());
     ASSERT_NE(-1, p1.readFileDescriptor());
     ASSERT_EQ(4, p1.objectsCount());

     p2.setDataPosition(0);
     ASSERT_EQ(2, p2.readInt32());
     ASSERT_NE(-1, p1.readFileDescriptor());
     ASSERT_NE(-1, p1.readFileDescriptor());
 }

 TEST(Parcel, AppendWithFdPartial) {
     unique_fd fd1 = unique_fd(dup(0));
     unique_fd fd2 = unique_fd(dup(0));

     Parcel p1;
     p1.writeInt32(1);
     p1.writeDupFileDescriptor(0);      // with ownership
     p1.writeFileDescriptor(fd1.get()); // without ownership
     Parcel p2;
     p2.writeInt32(2);
     p2.writeDupFileDescriptor(0);      // with ownership
     p2.writeFileDescriptor(fd2.get()); // without ownership

     ASSERT_EQ(OK, p1.appendFrom(&p2, 0, 8)); // BAD: 4 bytes into binder

     p1.setDataPosition(0);
     ASSERT_EQ(1, p1.readInt32());
     ASSERT_NE(-1, p1.readFileDescriptor());
     ASSERT_NE(-1, p1.readFileDescriptor());
     ASSERT_EQ(2, p1.readInt32());
     ASSERT_EQ(1717840517, p1.readInt32()); // whatever garbage that is there (ABI)
     ASSERT_EQ(2, p1.objectsCount());

     p2.setDataPosition(0);
     ASSERT_EQ(2, p2.readInt32());
     ASSERT_NE(-1, p1.readFileDescriptor());
     ASSERT_NE(-1, p1.readFileDescriptor());
 }

 // Tests a second operation results in a parcel at the same location as it
 // started.
 void parcelOpSameLength(const std::function<void(Parcel*)>& a, const std::function<void(Parcel*)>& b) {
     Parcel p;
     a(&p);
     size_t end = p.dataPosition();
     p.setDataPosition(0);
     b(&p);
     EXPECT_EQ(end, p.dataPosition());
 }

 TEST(Parcel, InverseInterfaceToken) {
     const String16 token = String16("asdf");
     parcelOpSameLength([&] (Parcel* p) {
         p->writeInterfaceToken(token);
     }, [&] (Parcel* p) {
         EXPECT_TRUE(p->enforceInterface(token, IPCThreadState::self()));
     });
 }

 TEST(Parcel, Utf8FromUtf16Read) {
     const char* token = "asdf";
     parcelOpSameLength([&] (Parcel* p) {
         p->writeString16(String16(token));
     }, [&] (Parcel* p) {
         std::string s;
         EXPECT_EQ(OK, p->readUtf8FromUtf16(&s));
         EXPECT_EQ(token, s);
     });
 }

 TEST(Parcel, Utf8AsUtf16Write) {
     std::string token = "asdf";
     parcelOpSameLength([&] (Parcel* p) {
         p->writeUtf8AsUtf16(token);
     }, [&] (Parcel* p) {
         String16 s;
         EXPECT_EQ(OK, p->readString16(&s));
         EXPECT_EQ(s, String16(token.c_str()));
     });
 }

 template <typename T>
 using readFunc = status_t (Parcel::*)(T* out) const;
 template <typename T>
 using writeFunc = status_t (Parcel::*)(const T& in);
 template <typename T>
 using copyWriteFunc = status_t (Parcel::*)(T in);

 template <typename T, typename WRITE_FUNC>
 void readWriteInverse(std::vector<T>&& ts, readFunc<T> r, WRITE_FUNC w) {
     for (const T& value : ts) {
         parcelOpSameLength([&] (Parcel* p) {
             (*p.*w)(value);
         }, [&] (Parcel* p) {
             T outValue;
             EXPECT_EQ(OK, (*p.*r)(&outValue));
             EXPECT_EQ(value, outValue);
         });
     }
 }

 template <typename T>
 void readWriteInverse(std::vector<T>&& ts, readFunc<T> r, writeFunc<T> w) {
     readWriteInverse<T, writeFunc<T>>(std::move(ts), r, w);
 }
 template <typename T>
 void readWriteInverse(std::vector<T>&& ts, readFunc<T> r, copyWriteFunc<T> w) {
     readWriteInverse<T, copyWriteFunc<T>>(std::move(ts), r, w);
 }

 #define TEST_READ_WRITE_INVERSE(type, name, ...) \
     TEST(Parcel, Inverse##name) { \
         readWriteInverse<type>(__VA_ARGS__, &Parcel::read##name, &Parcel::write##name); \
     }

 TEST_READ_WRITE_INVERSE(int32_t, Int32, {-2, -1, 0, 1, 2});
 TEST_READ_WRITE_INVERSE(uint32_t, Uint32, {0, 1, 2});
 TEST_READ_WRITE_INVERSE(int64_t, Int64, {-2, -1, 0, 1, 2});
 TEST_READ_WRITE_INVERSE(uint64_t, Uint64, {0, 1, 2});
 TEST_READ_WRITE_INVERSE(float, Float, {-1.0f, 0.0f, 3.14f});
 TEST_READ_WRITE_INVERSE(double, Double, {-1.0, 0.0, 3.14});
 TEST_READ_WRITE_INVERSE(bool, Bool, {true, false});
 TEST_READ_WRITE_INVERSE(char16_t, Char, {u'a', u'\0'});
 TEST_READ_WRITE_INVERSE(int8_t, Byte, {-1, 0, 1});
 TEST_READ_WRITE_INVERSE(String8, String8, {String8(), String8("a"), String8("asdf")});
 TEST_READ_WRITE_INVERSE(String16, String16, {String16(), String16("a"), String16("asdf")});

 TEST(Parcel, GetOpenAshmemSize) {
     constexpr size_t kSize = 1024;
     constexpr size_t kCount = 3;

     Parcel p;

     for (size_t i = 0; i < kCount; i++) {
         int fd = ashmem_create_region("test-getOpenAshmemSize", kSize);
         ASSERT_GE(fd, 0);
         ASSERT_EQ(OK, p.writeFileDescriptor(fd, true /* take ownership */));

         ASSERT_EQ((kSize * (i + 1)), p.getOpenAshmemSize());
     }
 }
	/*
	* Copyright (C) 2020 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 <binder/IPCThreadState.h>
	#include <binder/Parcel.h>
	#include <binder/Status.h>
	#include <cutils/ashmem.h>
	#include <gtest/gtest.h>

	using android::BBinder;
	using android::IBinder;
	using android::IPCThreadState;
	using android::OK;
	using android::Parcel;
	using android::sp;
	using android::status_t;
	using android::String16;
	using android::String8;
	using android::binder::Status;
	using android::binder::unique_fd;

	TEST(Parcel, NonNullTerminatedString8) {
	String8 kTestString = String8("test-is-good");

	// write non-null terminated string
	Parcel p;
	p.writeString8(kTestString);
	p.setDataPosition(0);
	// BAD! assumption of wire format for test
	// write over length of string
	p.writeInt32(kTestString.size() - 2);

	p.setDataPosition(0);
	String8 output;
	EXPECT_NE(OK, p.readString8(&output));
	EXPECT_EQ(output.size(), 0);
	}

	TEST(Parcel, NonNullTerminatedString16) {
	String16 kTestString = String16("test-is-good");

	// write non-null terminated string
	Parcel p;
	p.writeString16(kTestString);
	p.setDataPosition(0);
	// BAD! assumption of wire format for test
	// write over length of string
	p.writeInt32(kTestString.size() - 2);

	p.setDataPosition(0);
	String16 output;
	EXPECT_NE(OK, p.readString16(&output));
	EXPECT_EQ(output.size(), 0);
	}

	TEST(Parcel, EnforceNoDataAvail) {
	const int32_t kTestInt = 42;
	const String8 kTestString = String8("test-is-good");
	Parcel p;
	p.writeInt32(kTestInt);
	p.writeString8(kTestString);
	p.setDataPosition(0);
	EXPECT_EQ(kTestInt, p.readInt32());
	EXPECT_EQ(p.enforceNoDataAvail().exceptionCode(), Status::Exception::EX_BAD_PARCELABLE);
	EXPECT_EQ(kTestString, p.readString8());
	EXPECT_EQ(p.enforceNoDataAvail().exceptionCode(), Status::Exception::EX_NONE);
	}

	TEST(Parcel, DebugReadAllBinders) {
	sp<IBinder> binder1 = sp<BBinder>::make();
	sp<IBinder> binder2 = sp<BBinder>::make();

	Parcel p;
	p.writeInt32(4);
	p.writeStrongBinder(binder1);
	p.writeStrongBinder(nullptr);
	p.writeInt32(4);
	p.writeStrongBinder(binder2);
	p.writeInt32(4);

	auto ret = p.debugReadAllStrongBinders();

	ASSERT_EQ(ret.size(), 2);
	EXPECT_EQ(ret[0], binder1);
	EXPECT_EQ(ret[1], binder2);
	}

	TEST(Parcel, DebugReadAllFds) {
	Parcel p;
	p.writeInt32(4);
	p.writeFileDescriptor(STDOUT_FILENO, false /takeOwnership/);
	p.writeInt32(4);
	p.writeFileDescriptor(STDIN_FILENO, false /takeOwnership/);
	p.writeInt32(4);

	auto ret = p.debugReadAllFileDescriptors();

	ASSERT_EQ(ret.size(), 2);
	EXPECT_EQ(ret[0], STDOUT_FILENO);
	EXPECT_EQ(ret[1], STDIN_FILENO);
	}

	TEST(Parcel, AppendFromEmpty) {
	Parcel p1;
	Parcel p2;
	p2.writeInt32(2);

	ASSERT_EQ(OK, p1.appendFrom(&p2, 0, p2.dataSize()));

	p1.setDataPosition(0);
	ASSERT_EQ(2, p1.readInt32());

	p2.setDataPosition(0);
	ASSERT_EQ(2, p2.readInt32());
	}

	TEST(Parcel, AppendPlainData) {
	Parcel p1;
	p1.writeInt32(1);
	Parcel p2;
	p2.writeInt32(2);

	ASSERT_EQ(OK, p1.appendFrom(&p2, 0, p2.dataSize()));

	p1.setDataPosition(0);
	ASSERT_EQ(1, p1.readInt32());
	ASSERT_EQ(2, p1.readInt32());

	p2.setDataPosition(0);
	ASSERT_EQ(2, p2.readInt32());
	}

	TEST(Parcel, AppendPlainDataPartial) {
	Parcel p1;
	p1.writeInt32(1);
	Parcel p2;
	p2.writeInt32(2);
	p2.writeInt32(3);
	p2.writeInt32(4);

	// only copy 8 bytes (two int32's worth)
	ASSERT_EQ(OK, p1.appendFrom(&p2, 0, 8));

	p1.setDataPosition(0);
	ASSERT_EQ(1, p1.readInt32());
	ASSERT_EQ(2, p1.readInt32());
	ASSERT_EQ(3, p1.readInt32());
	ASSERT_EQ(0, p1.readInt32()); // not 4, end of Parcel

	p2.setDataPosition(0);
	ASSERT_EQ(2, p2.readInt32());
	}

	TEST(Parcel, AppendWithBinder) {
	sp<IBinder> b1 = sp<BBinder>::make();
	sp<IBinder> b2 = sp<BBinder>::make();

	Parcel p1;
	p1.writeInt32(1);
	p1.writeStrongBinder(b1);
	Parcel p2;
	p2.writeInt32(2);
	p2.writeStrongBinder(b2);

	ASSERT_EQ(OK, p1.appendFrom(&p2, 0, p2.dataSize()));

	p1.setDataPosition(0);
	ASSERT_EQ(1, p1.readInt32());
	ASSERT_EQ(b1, p1.readStrongBinder());
	ASSERT_EQ(2, p1.readInt32());
	ASSERT_EQ(b2, p1.readStrongBinder());
	ASSERT_EQ(2, p1.objectsCount());

	p2.setDataPosition(0);
	ASSERT_EQ(2, p2.readInt32());
	ASSERT_EQ(b2, p2.readStrongBinder());
	}

	TEST(Parcel, AppendWithBinderPartial) {
	sp<IBinder> b1 = sp<BBinder>::make();
	sp<IBinder> b2 = sp<BBinder>::make();

	Parcel p1;
	p1.writeInt32(1);
	p1.writeStrongBinder(b1);
	Parcel p2;
	p2.writeInt32(2);
	p2.writeStrongBinder(b2);

	ASSERT_EQ(OK, p1.appendFrom(&p2, 0, 8)); // BAD: 4 bytes into strong binder

	p1.setDataPosition(0);
	ASSERT_EQ(1, p1.readInt32());
	ASSERT_EQ(b1, p1.readStrongBinder());
	ASSERT_EQ(2, p1.readInt32());
	ASSERT_EQ(1935813253, p1.readInt32()); // whatever garbage that is there (ABI)
	ASSERT_EQ(1, p1.objectsCount());

	p2.setDataPosition(0);
	ASSERT_EQ(2, p2.readInt32());
	ASSERT_EQ(b2, p2.readStrongBinder());
	}

	TEST(Parcel, AppendWithFd) {
	unique_fd fd1 = unique_fd(dup(0));
	unique_fd fd2 = unique_fd(dup(0));

	Parcel p1;
	p1.writeInt32(1);
	p1.writeDupFileDescriptor(0); // with ownership
	p1.writeFileDescriptor(fd1.get()); // without ownership
	Parcel p2;
	p2.writeInt32(2);
	p2.writeDupFileDescriptor(0); // with ownership
	p2.writeFileDescriptor(fd2.get()); // without ownership

	ASSERT_EQ(OK, p1.appendFrom(&p2, 0, p2.dataSize()));

	p1.setDataPosition(0);
	ASSERT_EQ(1, p1.readInt32());
	ASSERT_NE(-1, p1.readFileDescriptor());
	ASSERT_NE(-1, p1.readFileDescriptor());
	ASSERT_EQ(2, p1.readInt32());
	ASSERT_NE(-1, p1.readFileDescriptor());
	ASSERT_NE(-1, p1.readFileDescriptor());
	ASSERT_EQ(4, p1.objectsCount());

	p2.setDataPosition(0);
	ASSERT_EQ(2, p2.readInt32());
	ASSERT_NE(-1, p1.readFileDescriptor());
	ASSERT_NE(-1, p1.readFileDescriptor());
	}

	TEST(Parcel, AppendWithFdPartial) {
	unique_fd fd1 = unique_fd(dup(0));
	unique_fd fd2 = unique_fd(dup(0));

	Parcel p1;
	p1.writeInt32(1);
	p1.writeDupFileDescriptor(0); // with ownership
	p1.writeFileDescriptor(fd1.get()); // without ownership
	Parcel p2;
	p2.writeInt32(2);
	p2.writeDupFileDescriptor(0); // with ownership
	p2.writeFileDescriptor(fd2.get()); // without ownership

	ASSERT_EQ(OK, p1.appendFrom(&p2, 0, 8)); // BAD: 4 bytes into binder

	p1.setDataPosition(0);
	ASSERT_EQ(1, p1.readInt32());
	ASSERT_NE(-1, p1.readFileDescriptor());
	ASSERT_NE(-1, p1.readFileDescriptor());
	ASSERT_EQ(2, p1.readInt32());
	ASSERT_EQ(1717840517, p1.readInt32()); // whatever garbage that is there (ABI)
	ASSERT_EQ(2, p1.objectsCount());

	p2.setDataPosition(0);
	ASSERT_EQ(2, p2.readInt32());
	ASSERT_NE(-1, p1.readFileDescriptor());
	ASSERT_NE(-1, p1.readFileDescriptor());
	}

	// Tests a second operation results in a parcel at the same location as it
	// started.
	void parcelOpSameLength(const std::function<void(Parcel)>& a, const std::function<void(Parcel)>& b) {
	Parcel p;
	a(&p);
	size_t end = p.dataPosition();
	p.setDataPosition(0);
	b(&p);
	EXPECT_EQ(end, p.dataPosition());
	}

	TEST(Parcel, InverseInterfaceToken) {
	const String16 token = String16("asdf");
	parcelOpSameLength([&] (Parcel* p) {
	p->writeInterfaceToken(token);
	}, [&] (Parcel* p) {
	EXPECT_TRUE(p->enforceInterface(token, IPCThreadState::self()));
	});
	}

	TEST(Parcel, Utf8FromUtf16Read) {
	const char* token = "asdf";
	parcelOpSameLength([&] (Parcel* p) {
	p->writeString16(String16(token));
	}, [&] (Parcel* p) {
	std::string s;
	EXPECT_EQ(OK, p->readUtf8FromUtf16(&s));
	EXPECT_EQ(token, s);
	});
	}

	TEST(Parcel, Utf8AsUtf16Write) {
	std::string token = "asdf";
	parcelOpSameLength([&] (Parcel* p) {
	p->writeUtf8AsUtf16(token);
	}, [&] (Parcel* p) {
	String16 s;
	EXPECT_EQ(OK, p->readString16(&s));
	EXPECT_EQ(s, String16(token.c_str()));
	});
	}

	template <typename T>
	using readFunc = status_t (Parcel::)(T out) const;
	template <typename T>
	using writeFunc = status_t (Parcel::*)(const T& in);
	template <typename T>
	using copyWriteFunc = status_t (Parcel::*)(T in);

	template <typename T, typename WRITE_FUNC>
	void readWriteInverse(std::vector<T>&& ts, readFunc<T> r, WRITE_FUNC w) {
	for (const T& value : ts) {
	parcelOpSameLength([&] (Parcel* p) {
	(p.w)(value);
	}, [&] (Parcel* p) {
	T outValue;
	EXPECT_EQ(OK, (p.r)(&outValue));
	EXPECT_EQ(value, outValue);
	});
	}
	}

	template <typename T>
	void readWriteInverse(std::vector<T>&& ts, readFunc<T> r, writeFunc<T> w) {
	readWriteInverse<T, writeFunc<T>>(std::move(ts), r, w);
	}
	template <typename T>
	void readWriteInverse(std::vector<T>&& ts, readFunc<T> r, copyWriteFunc<T> w) {
	readWriteInverse<T, copyWriteFunc<T>>(std::move(ts), r, w);
	}

	#define TEST_READ_WRITE_INVERSE(type, name, ...) \
	TEST(Parcel, Inverse##name) { \
	readWriteInverse<type>(__VA_ARGS__, &Parcel::read##name, &Parcel::write##name); \
	}

	TEST_READ_WRITE_INVERSE(int32_t, Int32, {-2, -1, 0, 1, 2});
	TEST_READ_WRITE_INVERSE(uint32_t, Uint32, {0, 1, 2});
	TEST_READ_WRITE_INVERSE(int64_t, Int64, {-2, -1, 0, 1, 2});
	TEST_READ_WRITE_INVERSE(uint64_t, Uint64, {0, 1, 2});
	TEST_READ_WRITE_INVERSE(float, Float, {-1.0f, 0.0f, 3.14f});
	TEST_READ_WRITE_INVERSE(double, Double, {-1.0, 0.0, 3.14});
	TEST_READ_WRITE_INVERSE(bool, Bool, {true, false});
	TEST_READ_WRITE_INVERSE(char16_t, Char, {u'a', u'\0'});
	TEST_READ_WRITE_INVERSE(int8_t, Byte, {-1, 0, 1});
	TEST_READ_WRITE_INVERSE(String8, String8, {String8(), String8("a"), String8("asdf")});
	TEST_READ_WRITE_INVERSE(String16, String16, {String16(), String16("a"), String16("asdf")});

	TEST(Parcel, GetOpenAshmemSize) {
	constexpr size_t kSize = 1024;
	constexpr size_t kCount = 3;

	Parcel p;

	for (size_t i = 0; i < kCount; i++) {
	int fd = ashmem_create_region("test-getOpenAshmemSize", kSize);
	ASSERT_GE(fd, 0);
	ASSERT_EQ(OK, p.writeFileDescriptor(fd, true /* take ownership */));

	ASSERT_EQ((kSize * (i + 1)), p.getOpenAshmemSize());
	}
	}