base/utf8_test.cpp - android-core - Git at Google

 /*
 * Copyright (C) 2015 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 "android-base/utf8.h"

 #include <gtest/gtest.h>

 #include "android-base/macros.h"

 namespace android {
 namespace base {

 TEST(UTFStringConversionsTest, ConvertInvalidUTF8) {
   std::wstring wide;

   errno = 0;

   // Standalone \xa2 is an invalid UTF-8 sequence, so this should return an
   // error. Concatenate two C/C++ literal string constants to prevent the
   // compiler from giving an error about "\xa2af" containing a "hex escape
   // sequence out of range".
   EXPECT_FALSE(android::base::UTF8ToWide("before\xa2" "after", &wide));

   EXPECT_EQ(EILSEQ, errno);

   // Even if an invalid character is encountered, UTF8ToWide() should still do
   // its best to convert the rest of the string. sysdeps_win32.cpp:
   // _console_write_utf8() depends on this behavior.
   //
   // Thus, we verify that the valid characters are converted, but we ignore the
   // specific replacement character that UTF8ToWide() may replace the invalid
   // UTF-8 characters with because we want to allow that to change if the
   // implementation changes.
   EXPECT_EQ(0U, wide.find(L"before"));
   const wchar_t after_wide[] = L"after";
   EXPECT_EQ(wide.length() - (arraysize(after_wide) - 1), wide.find(after_wide));
 }

 // Below is adapted from https://chromium.googlesource.com/chromium/src/+/master/base/strings/utf_string_conversions_unittest.cc

 // Copyright (c) 2010 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.

 // The tests below from utf_string_conversions_unittest.cc check for this
 // preprocessor symbol, so define it, as it is appropriate for Windows.
 #define WCHAR_T_IS_UTF16
 static_assert(sizeof(wchar_t) == 2, "wchar_t is not 2 bytes");

 // The tests below from utf_string_conversions_unittest.cc call versions of
 // UTF8ToWide() and WideToUTF8() that don't return success/failure, so these are
 // stub implementations with that signature. These are just for testing and
 // should not be moved to base because they assert/expect no errors which is
 // probably not a good idea (or at least it is something that should be left
 // up to the caller, not a base library).

 static std::wstring UTF8ToWide(const std::string& utf8) {
   std::wstring utf16;
   EXPECT_TRUE(UTF8ToWide(utf8, &utf16));
   return utf16;
 }

 static std::string WideToUTF8(const std::wstring& utf16) {
   std::string utf8;
   EXPECT_TRUE(WideToUTF8(utf16, &utf8));
   return utf8;
 }

 namespace {

 const wchar_t* const kConvertRoundtripCases[] = {
   L"Google Video",
   // "网页 图片 资讯更多 »"
   L"\x7f51\x9875\x0020\x56fe\x7247\x0020\x8d44\x8baf\x66f4\x591a\x0020\x00bb",
   //  "Παγκόσμιος Ιστός"
   L"\x03a0\x03b1\x03b3\x03ba\x03cc\x03c3\x03bc\x03b9"
   L"\x03bf\x03c2\x0020\x0399\x03c3\x03c4\x03cc\x03c2",
   // "Поиск страниц на русском"
   L"\x041f\x043e\x0438\x0441\x043a\x0020\x0441\x0442"
   L"\x0440\x0430\x043d\x0438\x0446\x0020\x043d\x0430"
   L"\x0020\x0440\x0443\x0441\x0441\x043a\x043e\x043c",
   // "전체서비스"
   L"\xc804\xccb4\xc11c\xbe44\xc2a4",

   // Test characters that take more than 16 bits. This will depend on whether
   // wchar_t is 16 or 32 bits.
 #if defined(WCHAR_T_IS_UTF16)
   L"\xd800\xdf00",
   // ?????  (Mathematical Alphanumeric Symbols (U+011d40 - U+011d44 : A,B,C,D,E)
   L"\xd807\xdd40\xd807\xdd41\xd807\xdd42\xd807\xdd43\xd807\xdd44",
 #elif defined(WCHAR_T_IS_UTF32)
   L"\x10300",
   // ?????  (Mathematical Alphanumeric Symbols (U+011d40 - U+011d44 : A,B,C,D,E)
   L"\x11d40\x11d41\x11d42\x11d43\x11d44",
 #endif
 };

 }  // namespace

 TEST(UTFStringConversionsTest, ConvertUTF8AndWide) {
   // we round-trip all the wide strings through UTF-8 to make sure everything
   // agrees on the conversion. This uses the stream operators to test them
   // simultaneously.
   for (size_t i = 0; i < arraysize(kConvertRoundtripCases); ++i) {
     std::ostringstream utf8;
     utf8 << WideToUTF8(kConvertRoundtripCases[i]);
     std::wostringstream wide;
     wide << UTF8ToWide(utf8.str());

     EXPECT_EQ(kConvertRoundtripCases[i], wide.str());
   }
 }

 TEST(UTFStringConversionsTest, ConvertUTF8AndWideEmptyString) {
   // An empty std::wstring should be converted to an empty std::string,
   // and vice versa.
   std::wstring wempty;
   std::string empty;
   EXPECT_EQ(empty, WideToUTF8(wempty));
   EXPECT_EQ(wempty, UTF8ToWide(empty));
 }

 TEST(UTFStringConversionsTest, ConvertUTF8ToWide) {
   struct UTF8ToWideCase {
     const char* utf8;
     const wchar_t* wide;
     bool success;
   } convert_cases[] = {
     // Regular UTF-8 input.
     {"\xe4\xbd\xa0\xe5\xa5\xbd", L"\x4f60\x597d", true},
     // Non-character is passed through.
     {"\xef\xbf\xbfHello", L"\xffffHello", true},
     // Truncated UTF-8 sequence.
     {"\xe4\xa0\xe5\xa5\xbd", L"\xfffd\x597d", false},
     // Truncated off the end.
     {"\xe5\xa5\xbd\xe4\xa0", L"\x597d\xfffd", false},
     // Non-shortest-form UTF-8.
     {"\xf0\x84\xbd\xa0\xe5\xa5\xbd", L"\xfffd\x597d", false},
     // This UTF-8 character decodes to a UTF-16 surrogate, which is illegal.
     // Note that for whatever reason, this test fails on Windows XP.
     {"\xed\xb0\x80", L"\xfffd", false},
     // Non-BMP characters. The second is a non-character regarded as valid.
     // The result will either be in UTF-16 or UTF-32.
 #if defined(WCHAR_T_IS_UTF16)
     {"A\xF0\x90\x8C\x80z", L"A\xd800\xdf00z", true},
     {"A\xF4\x8F\xBF\xBEz", L"A\xdbff\xdffez", true},
 #elif defined(WCHAR_T_IS_UTF32)
     {"A\xF0\x90\x8C\x80z", L"A\x10300z", true},
     {"A\xF4\x8F\xBF\xBEz", L"A\x10fffez", true},
 #endif
   };

   for (size_t i = 0; i < arraysize(convert_cases); i++) {
     std::wstring converted;
     errno = 0;
     const bool success = UTF8ToWide(convert_cases[i].utf8,
                                     strlen(convert_cases[i].utf8),
                                     &converted);
     EXPECT_EQ(convert_cases[i].success, success);
     // The original test always compared expected and converted, but don't do
     // that because our implementation of UTF8ToWide() does not guarantee to
     // produce the same output in error situations.
     if (success) {
       std::wstring expected(convert_cases[i].wide);
       EXPECT_EQ(expected, converted);
     } else {
       EXPECT_EQ(EILSEQ, errno);
     }
   }

   // Manually test an embedded NULL.
   std::wstring converted;
   EXPECT_TRUE(UTF8ToWide("\00Z\t", 3, &converted));
   ASSERT_EQ(3U, converted.length());
   EXPECT_EQ(static_cast<wchar_t>(0), converted[0]);
   EXPECT_EQ('Z', converted[1]);
   EXPECT_EQ('\t', converted[2]);

   // Make sure that conversion replaces, not appends.
   EXPECT_TRUE(UTF8ToWide("B", 1, &converted));
   ASSERT_EQ(1U, converted.length());
   EXPECT_EQ('B', converted[0]);
 }

 #if defined(WCHAR_T_IS_UTF16)
 // This test is only valid when wchar_t == UTF-16.
 TEST(UTFStringConversionsTest, ConvertUTF16ToUTF8) {
   struct WideToUTF8Case {
     const wchar_t* utf16;
     const char* utf8;
     bool success;
   } convert_cases[] = {
     // Regular UTF-16 input.
     {L"\x4f60\x597d", "\xe4\xbd\xa0\xe5\xa5\xbd", true},
     // Test a non-BMP character.
     {L"\xd800\xdf00", "\xF0\x90\x8C\x80", true},
     // Non-characters are passed through.
     {L"\xffffHello", "\xEF\xBF\xBFHello", true},
     {L"\xdbff\xdffeHello", "\xF4\x8F\xBF\xBEHello", true},
     // The first character is a truncated UTF-16 character.
     // Note that for whatever reason, this test fails on Windows XP.
     {L"\xd800\x597d", "\xef\xbf\xbd\xe5\xa5\xbd",
 #if (WINVER >= 0x0600)
     // Only Vista and later has a new API/flag that correctly returns false.
     false
 #else
     true
 #endif
     },
     // Truncated at the end.
     // Note that for whatever reason, this test fails on Windows XP.
     {L"\x597d\xd800", "\xe5\xa5\xbd\xef\xbf\xbd",
 #if (WINVER >= 0x0600)
     // Only Vista and later has a new API/flag that correctly returns false.
     false
 #else
     true
 #endif
     },
   };

   for (size_t i = 0; i < arraysize(convert_cases); i++) {
     std::string converted;
     errno = 0;
     const bool success = WideToUTF8(convert_cases[i].utf16,
                                     wcslen(convert_cases[i].utf16),
                                     &converted);
     EXPECT_EQ(convert_cases[i].success, success);
     // The original test always compared expected and converted, but don't do
     // that because our implementation of WideToUTF8() does not guarantee to
     // produce the same output in error situations.
     if (success) {
       std::string expected(convert_cases[i].utf8);
       EXPECT_EQ(expected, converted);
     } else {
       EXPECT_EQ(EILSEQ, errno);
     }
   }
 }

 #elif defined(WCHAR_T_IS_UTF32)
 // This test is only valid when wchar_t == UTF-32.
 TEST(UTFStringConversionsTest, ConvertUTF32ToUTF8) {
   struct WideToUTF8Case {
     const wchar_t* utf32;
     const char* utf8;
     bool success;
   } convert_cases[] = {
     // Regular 16-bit input.
     {L"\x4f60\x597d", "\xe4\xbd\xa0\xe5\xa5\xbd", true},
     // Test a non-BMP character.
     {L"A\x10300z", "A\xF0\x90\x8C\x80z", true},
     // Non-characters are passed through.
     {L"\xffffHello", "\xEF\xBF\xBFHello", true},
     {L"\x10fffeHello", "\xF4\x8F\xBF\xBEHello", true},
     // Invalid Unicode code points.
     {L"\xfffffffHello", "\xEF\xBF\xBDHello", false},
     // The first character is a truncated UTF-16 character.
     {L"\xd800\x597d", "\xef\xbf\xbd\xe5\xa5\xbd", false},
     {L"\xdc01Hello", "\xef\xbf\xbdHello", false},
   };

   for (size_t i = 0; i < arraysize(convert_cases); i++) {
     std::string converted;
     EXPECT_EQ(convert_cases[i].success,
               WideToUTF8(convert_cases[i].utf32,
                          wcslen(convert_cases[i].utf32),
                          &converted));
     std::string expected(convert_cases[i].utf8);
     EXPECT_EQ(expected, converted);
   }
 }
 #endif  // defined(WCHAR_T_IS_UTF32)

 // The test below uses these types and functions, so just do enough to get the
 // test running.
 typedef wchar_t char16;
 typedef std::wstring string16;

 template<typename T>
 static void* WriteInto(T* t, size_t size) {
   // std::(w)string::resize() already includes space for a NULL terminator.
   t->resize(size - 1);
   return &(*t)[0];
 }

 // A stub implementation that calls a helper from above, just to get the test
 // below working. This is just for testing and should not be moved to base
 // because this ignores errors which is probably not a good idea, plus it takes
 // a string16 type which we don't really have.
 static std::string UTF16ToUTF8(const string16& utf16) {
   return WideToUTF8(utf16);
 }

 TEST(UTFStringConversionsTest, ConvertMultiString) {
   static char16 multi16[] = {
     'f', 'o', 'o', '\0',
     'b', 'a', 'r', '\0',
     'b', 'a', 'z', '\0',
     '\0'
   };
   static char multi[] = {
     'f', 'o', 'o', '\0',
     'b', 'a', 'r', '\0',
     'b', 'a', 'z', '\0',
     '\0'
   };
   string16 multistring16;
   memcpy(WriteInto(&multistring16, arraysize(multi16)), multi16,
                    sizeof(multi16));
   EXPECT_EQ(arraysize(multi16) - 1, multistring16.length());
   std::string expected;
   memcpy(WriteInto(&expected, arraysize(multi)), multi, sizeof(multi));
   EXPECT_EQ(arraysize(multi) - 1, expected.length());
   const std::string& converted = UTF16ToUTF8(multistring16);
   EXPECT_EQ(arraysize(multi) - 1, converted.length());
   EXPECT_EQ(expected, converted);
 }

 // The tests below from sys_string_conversions_unittest.cc call SysWideToUTF8()
 // and SysUTF8ToWide(), so these are stub implementations that call the helpers
 // above. These are just for testing and should not be moved to base because
 // they ignore errors which is probably not a good idea.

 static std::string SysWideToUTF8(const std::wstring& utf16) {
   return WideToUTF8(utf16);
 }

 static std::wstring SysUTF8ToWide(const std::string& utf8) {
   return UTF8ToWide(utf8);
 }

 // Below is adapted from https://chromium.googlesource.com/chromium/src/+/master/base/strings/sys_string_conversions_unittest.cc

 // Copyright (c) 2011 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.

 #ifdef WCHAR_T_IS_UTF32
 static const std::wstring kSysWideOldItalicLetterA = L"\x10300";
 #else
 static const std::wstring kSysWideOldItalicLetterA = L"\xd800\xdf00";
 #endif

 TEST(SysStrings, SysWideToUTF8) {
   EXPECT_EQ("Hello, world", SysWideToUTF8(L"Hello, world"));
   EXPECT_EQ("\xe4\xbd\xa0\xe5\xa5\xbd", SysWideToUTF8(L"\x4f60\x597d"));

   // >16 bits
   EXPECT_EQ("\xF0\x90\x8C\x80", SysWideToUTF8(kSysWideOldItalicLetterA));

   // Error case. When Windows finds a UTF-16 character going off the end of
   // a string, it just converts that literal value to UTF-8, even though this
   // is invalid.
   //
   // This is what XP does, but Vista has different behavior, so we don't bother
   // verifying it:
   // EXPECT_EQ("\xE4\xBD\xA0\xED\xA0\x80zyxw",
   //           SysWideToUTF8(L"\x4f60\xd800zyxw"));

   // Test embedded NULLs.
   std::wstring wide_null(L"a");
   wide_null.push_back(0);
   wide_null.push_back('b');

   std::string expected_null("a");
   expected_null.push_back(0);
   expected_null.push_back('b');

   EXPECT_EQ(expected_null, SysWideToUTF8(wide_null));
 }

 TEST(SysStrings, SysUTF8ToWide) {
   EXPECT_EQ(L"Hello, world", SysUTF8ToWide("Hello, world"));
   EXPECT_EQ(L"\x4f60\x597d", SysUTF8ToWide("\xe4\xbd\xa0\xe5\xa5\xbd"));
   // >16 bits
   EXPECT_EQ(kSysWideOldItalicLetterA, SysUTF8ToWide("\xF0\x90\x8C\x80"));

   // Error case. When Windows finds an invalid UTF-8 character, it just skips
   // it. This seems weird because it's inconsistent with the reverse conversion.
   //
   // This is what XP does, but Vista has different behavior, so we don't bother
   // verifying it:
   // EXPECT_EQ(L"\x4f60zyxw", SysUTF8ToWide("\xe4\xbd\xa0\xe5\xa5zyxw"));

   // Test embedded NULLs.
   std::string utf8_null("a");
   utf8_null.push_back(0);
   utf8_null.push_back('b');

   std::wstring expected_null(L"a");
   expected_null.push_back(0);
   expected_null.push_back('b');

   EXPECT_EQ(expected_null, SysUTF8ToWide(utf8_null));
 }

 }  // namespace base
 }  // namespace android
	/*
	* Copyright (C) 2015 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 "android-base/utf8.h"

	#include <gtest/gtest.h>

	#include "android-base/macros.h"

	namespace android {
	namespace base {

	TEST(UTFStringConversionsTest, ConvertInvalidUTF8) {
	std::wstring wide;

	errno = 0;

	// Standalone \xa2 is an invalid UTF-8 sequence, so this should return an
	// error. Concatenate two C/C++ literal string constants to prevent the
	// compiler from giving an error about "\xa2af" containing a "hex escape
	// sequence out of range".
	EXPECT_FALSE(android::base::UTF8ToWide("before\xa2" "after", &wide));

	EXPECT_EQ(EILSEQ, errno);

	// Even if an invalid character is encountered, UTF8ToWide() should still do
	// its best to convert the rest of the string. sysdeps_win32.cpp:
	// _console_write_utf8() depends on this behavior.
	//
	// Thus, we verify that the valid characters are converted, but we ignore the
	// specific replacement character that UTF8ToWide() may replace the invalid
	// UTF-8 characters with because we want to allow that to change if the
	// implementation changes.
	EXPECT_EQ(0U, wide.find(L"before"));
	const wchar_t after_wide[] = L"after";
	EXPECT_EQ(wide.length() - (arraysize(after_wide) - 1), wide.find(after_wide));
	}

	// Below is adapted from https://chromium.googlesource.com/chromium/src/+/master/base/strings/utf_string_conversions_unittest.cc

	// Copyright (c) 2010 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.

	// The tests below from utf_string_conversions_unittest.cc check for this
	// preprocessor symbol, so define it, as it is appropriate for Windows.
	#define WCHAR_T_IS_UTF16
	static_assert(sizeof(wchar_t) == 2, "wchar_t is not 2 bytes");

	// The tests below from utf_string_conversions_unittest.cc call versions of
	// UTF8ToWide() and WideToUTF8() that don't return success/failure, so these are
	// stub implementations with that signature. These are just for testing and
	// should not be moved to base because they assert/expect no errors which is
	// probably not a good idea (or at least it is something that should be left
	// up to the caller, not a base library).

	static std::wstring UTF8ToWide(const std::string& utf8) {
	std::wstring utf16;
	EXPECT_TRUE(UTF8ToWide(utf8, &utf16));
	return utf16;
	}

	static std::string WideToUTF8(const std::wstring& utf16) {
	std::string utf8;
	EXPECT_TRUE(WideToUTF8(utf16, &utf8));
	return utf8;
	}

	namespace {

	const wchar_t* const kConvertRoundtripCases[] = {
	L"Google Video",
	// "网页图片资讯更多 »"
	L"\x7f51\x9875\x0020\x56fe\x7247\x0020\x8d44\x8baf\x66f4\x591a\x0020\x00bb",
	// "Παγκόσμιος Ιστός"
	L"\x03a0\x03b1\x03b3\x03ba\x03cc\x03c3\x03bc\x03b9"
	L"\x03bf\x03c2\x0020\x0399\x03c3\x03c4\x03cc\x03c2",
	// "Поиск страниц на русском"
	L"\x041f\x043e\x0438\x0441\x043a\x0020\x0441\x0442"
	L"\x0440\x0430\x043d\x0438\x0446\x0020\x043d\x0430"
	L"\x0020\x0440\x0443\x0441\x0441\x043a\x043e\x043c",
	// "전체서비스"
	L"\xc804\xccb4\xc11c\xbe44\xc2a4",

	// Test characters that take more than 16 bits. This will depend on whether
	// wchar_t is 16 or 32 bits.
	#if defined(WCHAR_T_IS_UTF16)
	L"\xd800\xdf00",
	// ????? (Mathematical Alphanumeric Symbols (U+011d40 - U+011d44 : A,B,C,D,E)
	L"\xd807\xdd40\xd807\xdd41\xd807\xdd42\xd807\xdd43\xd807\xdd44",
	#elif defined(WCHAR_T_IS_UTF32)
	L"\x10300",
	// ????? (Mathematical Alphanumeric Symbols (U+011d40 - U+011d44 : A,B,C,D,E)
	L"\x11d40\x11d41\x11d42\x11d43\x11d44",
	#endif
	};

	} // namespace

	TEST(UTFStringConversionsTest, ConvertUTF8AndWide) {
	// we round-trip all the wide strings through UTF-8 to make sure everything
	// agrees on the conversion. This uses the stream operators to test them
	// simultaneously.
	for (size_t i = 0; i < arraysize(kConvertRoundtripCases); ++i) {
	std::ostringstream utf8;
	utf8 << WideToUTF8(kConvertRoundtripCases[i]);
	std::wostringstream wide;
	wide << UTF8ToWide(utf8.str());

	EXPECT_EQ(kConvertRoundtripCases[i], wide.str());
	}
	}

	TEST(UTFStringConversionsTest, ConvertUTF8AndWideEmptyString) {
	// An empty std::wstring should be converted to an empty std::string,
	// and vice versa.
	std::wstring wempty;
	std::string empty;
	EXPECT_EQ(empty, WideToUTF8(wempty));
	EXPECT_EQ(wempty, UTF8ToWide(empty));
	}

	TEST(UTFStringConversionsTest, ConvertUTF8ToWide) {
	struct UTF8ToWideCase {
	const char* utf8;
	const wchar_t* wide;
	bool success;
	} convert_cases[] = {
	// Regular UTF-8 input.
	{"\xe4\xbd\xa0\xe5\xa5\xbd", L"\x4f60\x597d", true},
	// Non-character is passed through.
	{"\xef\xbf\xbfHello", L"\xffffHello", true},
	// Truncated UTF-8 sequence.
	{"\xe4\xa0\xe5\xa5\xbd", L"\xfffd\x597d", false},
	// Truncated off the end.
	{"\xe5\xa5\xbd\xe4\xa0", L"\x597d\xfffd", false},
	// Non-shortest-form UTF-8.
	{"\xf0\x84\xbd\xa0\xe5\xa5\xbd", L"\xfffd\x597d", false},
	// This UTF-8 character decodes to a UTF-16 surrogate, which is illegal.
	// Note that for whatever reason, this test fails on Windows XP.
	{"\xed\xb0\x80", L"\xfffd", false},
	// Non-BMP characters. The second is a non-character regarded as valid.
	// The result will either be in UTF-16 or UTF-32.
	#if defined(WCHAR_T_IS_UTF16)
	{"A\xF0\x90\x8C\x80z", L"A\xd800\xdf00z", true},
	{"A\xF4\x8F\xBF\xBEz", L"A\xdbff\xdffez", true},
	#elif defined(WCHAR_T_IS_UTF32)
	{"A\xF0\x90\x8C\x80z", L"A\x10300z", true},
	{"A\xF4\x8F\xBF\xBEz", L"A\x10fffez", true},
	#endif
	};

	for (size_t i = 0; i < arraysize(convert_cases); i++) {
	std::wstring converted;
	errno = 0;
	const bool success = UTF8ToWide(convert_cases[i].utf8,
	strlen(convert_cases[i].utf8),
	&converted);
	EXPECT_EQ(convert_cases[i].success, success);
	// The original test always compared expected and converted, but don't do
	// that because our implementation of UTF8ToWide() does not guarantee to
	// produce the same output in error situations.
	if (success) {
	std::wstring expected(convert_cases[i].wide);
	EXPECT_EQ(expected, converted);
	} else {
	EXPECT_EQ(EILSEQ, errno);
	}
	}

	// Manually test an embedded NULL.
	std::wstring converted;
	EXPECT_TRUE(UTF8ToWide("\00Z\t", 3, &converted));
	ASSERT_EQ(3U, converted.length());
	EXPECT_EQ(static_cast<wchar_t>(0), converted[0]);
	EXPECT_EQ('Z', converted[1]);
	EXPECT_EQ('\t', converted[2]);

	// Make sure that conversion replaces, not appends.
	EXPECT_TRUE(UTF8ToWide("B", 1, &converted));
	ASSERT_EQ(1U, converted.length());
	EXPECT_EQ('B', converted[0]);
	}

	#if defined(WCHAR_T_IS_UTF16)
	// This test is only valid when wchar_t == UTF-16.
	TEST(UTFStringConversionsTest, ConvertUTF16ToUTF8) {
	struct WideToUTF8Case {
	const wchar_t* utf16;
	const char* utf8;
	bool success;
	} convert_cases[] = {
	// Regular UTF-16 input.
	{L"\x4f60\x597d", "\xe4\xbd\xa0\xe5\xa5\xbd", true},
	// Test a non-BMP character.
	{L"\xd800\xdf00", "\xF0\x90\x8C\x80", true},
	// Non-characters are passed through.
	{L"\xffffHello", "\xEF\xBF\xBFHello", true},
	{L"\xdbff\xdffeHello", "\xF4\x8F\xBF\xBEHello", true},
	// The first character is a truncated UTF-16 character.
	// Note that for whatever reason, this test fails on Windows XP.
	{L"\xd800\x597d", "\xef\xbf\xbd\xe5\xa5\xbd",
	#if (WINVER >= 0x0600)
	// Only Vista and later has a new API/flag that correctly returns false.
	false
	#else
	true
	#endif
	},
	// Truncated at the end.
	// Note that for whatever reason, this test fails on Windows XP.
	{L"\x597d\xd800", "\xe5\xa5\xbd\xef\xbf\xbd",
	#if (WINVER >= 0x0600)
	// Only Vista and later has a new API/flag that correctly returns false.
	false
	#else
	true
	#endif
	},
	};

	for (size_t i = 0; i < arraysize(convert_cases); i++) {
	std::string converted;
	errno = 0;
	const bool success = WideToUTF8(convert_cases[i].utf16,
	wcslen(convert_cases[i].utf16),
	&converted);
	EXPECT_EQ(convert_cases[i].success, success);
	// The original test always compared expected and converted, but don't do
	// that because our implementation of WideToUTF8() does not guarantee to
	// produce the same output in error situations.
	if (success) {
	std::string expected(convert_cases[i].utf8);
	EXPECT_EQ(expected, converted);
	} else {
	EXPECT_EQ(EILSEQ, errno);
	}
	}
	}

	#elif defined(WCHAR_T_IS_UTF32)
	// This test is only valid when wchar_t == UTF-32.
	TEST(UTFStringConversionsTest, ConvertUTF32ToUTF8) {
	struct WideToUTF8Case {
	const wchar_t* utf32;
	const char* utf8;
	bool success;
	} convert_cases[] = {
	// Regular 16-bit input.
	{L"\x4f60\x597d", "\xe4\xbd\xa0\xe5\xa5\xbd", true},
	// Test a non-BMP character.
	{L"A\x10300z", "A\xF0\x90\x8C\x80z", true},
	// Non-characters are passed through.
	{L"\xffffHello", "\xEF\xBF\xBFHello", true},
	{L"\x10fffeHello", "\xF4\x8F\xBF\xBEHello", true},
	// Invalid Unicode code points.
	{L"\xfffffffHello", "\xEF\xBF\xBDHello", false},
	// The first character is a truncated UTF-16 character.
	{L"\xd800\x597d", "\xef\xbf\xbd\xe5\xa5\xbd", false},
	{L"\xdc01Hello", "\xef\xbf\xbdHello", false},
	};

	for (size_t i = 0; i < arraysize(convert_cases); i++) {
	std::string converted;
	EXPECT_EQ(convert_cases[i].success,
	WideToUTF8(convert_cases[i].utf32,
	wcslen(convert_cases[i].utf32),
	&converted));
	std::string expected(convert_cases[i].utf8);
	EXPECT_EQ(expected, converted);
	}
	}
	#endif // defined(WCHAR_T_IS_UTF32)

	// The test below uses these types and functions, so just do enough to get the
	// test running.
	typedef wchar_t char16;
	typedef std::wstring string16;

	template<typename T>
	static void* WriteInto(T* t, size_t size) {
	// std::(w)string::resize() already includes space for a NULL terminator.
	t->resize(size - 1);
	return &(*t)[0];
	}

	// A stub implementation that calls a helper from above, just to get the test
	// below working. This is just for testing and should not be moved to base
	// because this ignores errors which is probably not a good idea, plus it takes
	// a string16 type which we don't really have.
	static std::string UTF16ToUTF8(const string16& utf16) {
	return WideToUTF8(utf16);
	}

	TEST(UTFStringConversionsTest, ConvertMultiString) {
	static char16 multi16[] = {
	'f', 'o', 'o', '\0',
	'b', 'a', 'r', '\0',
	'b', 'a', 'z', '\0',
	'\0'
	};
	static char multi[] = {
	'f', 'o', 'o', '\0',
	'b', 'a', 'r', '\0',
	'b', 'a', 'z', '\0',
	'\0'
	};
	string16 multistring16;
	memcpy(WriteInto(&multistring16, arraysize(multi16)), multi16,
	sizeof(multi16));
	EXPECT_EQ(arraysize(multi16) - 1, multistring16.length());
	std::string expected;
	memcpy(WriteInto(&expected, arraysize(multi)), multi, sizeof(multi));
	EXPECT_EQ(arraysize(multi) - 1, expected.length());
	const std::string& converted = UTF16ToUTF8(multistring16);
	EXPECT_EQ(arraysize(multi) - 1, converted.length());
	EXPECT_EQ(expected, converted);
	}

	// The tests below from sys_string_conversions_unittest.cc call SysWideToUTF8()
	// and SysUTF8ToWide(), so these are stub implementations that call the helpers
	// above. These are just for testing and should not be moved to base because
	// they ignore errors which is probably not a good idea.

	static std::string SysWideToUTF8(const std::wstring& utf16) {
	return WideToUTF8(utf16);
	}

	static std::wstring SysUTF8ToWide(const std::string& utf8) {
	return UTF8ToWide(utf8);
	}

	// Below is adapted from https://chromium.googlesource.com/chromium/src/+/master/base/strings/sys_string_conversions_unittest.cc

	// Copyright (c) 2011 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.

	#ifdef WCHAR_T_IS_UTF32
	static const std::wstring kSysWideOldItalicLetterA = L"\x10300";
	#else
	static const std::wstring kSysWideOldItalicLetterA = L"\xd800\xdf00";
	#endif

	TEST(SysStrings, SysWideToUTF8) {
	EXPECT_EQ("Hello, world", SysWideToUTF8(L"Hello, world"));
	EXPECT_EQ("\xe4\xbd\xa0\xe5\xa5\xbd", SysWideToUTF8(L"\x4f60\x597d"));

	// >16 bits
	EXPECT_EQ("\xF0\x90\x8C\x80", SysWideToUTF8(kSysWideOldItalicLetterA));

	// Error case. When Windows finds a UTF-16 character going off the end of
	// a string, it just converts that literal value to UTF-8, even though this
	// is invalid.
	//
	// This is what XP does, but Vista has different behavior, so we don't bother
	// verifying it:
	// EXPECT_EQ("\xE4\xBD\xA0\xED\xA0\x80zyxw",
	// SysWideToUTF8(L"\x4f60\xd800zyxw"));

	// Test embedded NULLs.
	std::wstring wide_null(L"a");
	wide_null.push_back(0);
	wide_null.push_back('b');

	std::string expected_null("a");
	expected_null.push_back(0);
	expected_null.push_back('b');

	EXPECT_EQ(expected_null, SysWideToUTF8(wide_null));
	}

	TEST(SysStrings, SysUTF8ToWide) {
	EXPECT_EQ(L"Hello, world", SysUTF8ToWide("Hello, world"));
	EXPECT_EQ(L"\x4f60\x597d", SysUTF8ToWide("\xe4\xbd\xa0\xe5\xa5\xbd"));
	// >16 bits
	EXPECT_EQ(kSysWideOldItalicLetterA, SysUTF8ToWide("\xF0\x90\x8C\x80"));

	// Error case. When Windows finds an invalid UTF-8 character, it just skips
	// it. This seems weird because it's inconsistent with the reverse conversion.
	//
	// This is what XP does, but Vista has different behavior, so we don't bother
	// verifying it:
	// EXPECT_EQ(L"\x4f60zyxw", SysUTF8ToWide("\xe4\xbd\xa0\xe5\xa5zyxw"));

	// Test embedded NULLs.
	std::string utf8_null("a");
	utf8_null.push_back(0);
	utf8_null.push_back('b');

	std::wstring expected_null(L"a");
	expected_null.push_back(0);
	expected_null.push_back('b');

	EXPECT_EQ(expected_null, SysUTF8ToWide(utf8_null));
	}

	} // namespace base
	} // namespace android