text: /*
   * Copyright (C) 2010 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.
   */
  
  #define LOG_TAG "Unicode_test"
  #include <utils/Log.h>
  #include <utils/Unicode.h>
  
  #include <gtest/gtest.h>
  
  namespace android {
  
  class UnicodeTest : public testing::Test {
  protected:
      virtual void SetUp() {
      }
  
      virtual void TearDown() {
      }
  
      char16_t const * const kSearchString = u"I am a leaf on the wind.";
  };
  
  TEST_F(UnicodeTest, UTF8toUTF16ZeroLength) {
      ssize_t measured;
  
      const uint8_t str[] = { };
  
      measured = utf8_to_utf16_length(str, 0);
      EXPECT_EQ(0, measured)
              << "Zero length input should return zero length output.";
  }
  
  TEST_F(UnicodeTest, UTF8toUTF16ASCIILength) {
      ssize_t measured;
  
      // U+0030 or ASCII '0'
      const uint8_t str[] = { 0x30 };
  
      measured = utf8_to_utf16_length(str, sizeof(str));
      EXPECT_EQ(1, measured)
              << "ASCII glyphs should have a length of 1 char16_t";
  }
  
  TEST_F(UnicodeTest, UTF8toUTF16Plane1Length) {
      ssize_t measured;
  
      // U+2323 SMILE
      const uint8_t str[] = { 0xE2, 0x8C, 0xA3 };
  
      measured = utf8_to_utf16_length(str, sizeof(str));
      EXPECT_EQ(1, measured)
              << "Plane 1 glyphs should have a length of 1 char16_t";
  }
  
  TEST_F(UnicodeTest, UTF8toUTF16SurrogateLength) {
      ssize_t measured;
  
      // U+10000
      const uint8_t str[] = { 0xF0, 0x90, 0x80, 0x80 };
  
      measured = utf8_to_utf16_length(str, sizeof(str));
      EXPECT_EQ(2, measured)
              << "Surrogate pairs should have a length of 2 char16_t";
  }
  
  TEST_F(UnicodeTest, UTF8toUTF16TruncatedUTF8) {
      ssize_t measured;
  
      // Truncated U+2323 SMILE
      // U+2323 SMILE
      const uint8_t str[] = { 0xE2, 0x8C };
  
      measured = utf8_to_utf16_length(str, sizeof(str));
      EXPECT_EQ(-1, measured)
              << "Truncated UTF-8 should return -1 to indicate invalid";
  }
  
  TEST_F(UnicodeTest, UTF8toUTF16Normal) {
      const uint8_t str[] = {
          0x30, // U+0030, 1 UTF-16 character
          0xC4, 0x80, // U+0100, 1 UTF-16 character
          0xE2, 0x8C, 0xA3, // U+2323, 1 UTF-16 character
          0xF0, 0x90, 0x80, 0x80, // U+10000, 2 UTF-16 character
      };
  
      char16_t output[1 + 1 + 1 + 2 + 1]; // Room for NULL
  
      utf8_to_utf16(str, sizeof(str), output, sizeof(output) / sizeof(output[0]));
  
      EXPECT_EQ(0x0030, output[0])
              << "should be U+0030";
      EXPECT_EQ(0x0100, output[1])
              << "should be U+0100";
      EXPECT_EQ(0x2323, output[2])
              << "should be U+2323";
      EXPECT_EQ(0xD800, output[3])
              << "should be first half of surrogate U+10000";
      EXPECT_EQ(0xDC00, output[4])
              << "should be second half of surrogate U+10000";
      EXPECT_EQ(NULL, output[5])
              << "should be NULL terminated";
  }
  
  TEST_F(UnicodeTest, strstr16EmptyTarget) {
      EXPECT_EQ(strstr16(kSearchString, u""), kSearchString)
              << "should return the original pointer";
  }
  
  TEST_F(UnicodeTest, strstr16SameString) {
      const char16_t* result = strstr16(kSearchString, kSearchString);
      EXPECT_EQ(kSearchString, result)
              << "should return the original pointer";
  }
  
  TEST_F(UnicodeTest, strstr16TargetStartOfString) {
      const char16_t* result = strstr16(kSearchString, u"I am");
      EXPECT_EQ(kSearchString, result)
              << "should return the original pointer";
  }
  
  
  TEST_F(UnicodeTest, strstr16TargetEndOfString) {
      const char16_t* result = strstr16(kSearchString, u"wind.");
      EXPECT_EQ(kSearchString+19, result);
  }
  
  TEST_F(UnicodeTest, strstr16TargetWithinString) {
      const char16_t* result = strstr16(kSearchString, u"leaf");
      EXPECT_EQ(kSearchString+7, result);
  }
  
  TEST_F(UnicodeTest, strstr16TargetNotPresent) {
      const char16_t* result = strstr16(kSearchString, u"soar");
      EXPECT_EQ(nullptr, result);
  }
  
  // http://b/29267949
  // Test that overreading in utf8_to_utf16_length is detected
  TEST_F(UnicodeTest, InvalidUtf8OverreadDetected) {
      // An utf8 char starting with \xc4 is two bytes long.
      // Add extra zeros so no extra memory is read in case the code doesn't
      // work as expected.
      static char utf8[] = "\xc4\x00\x00\x00";
      ASSERT_DEATH(utf8_to_utf16_length((uint8_t *) utf8, strlen(utf8),
              true /* overreadIsFatal */), "" /* regex for ASSERT_DEATH */);
  }
  
  }
  