}

      @Override
      public Hasher putChar(char c) {
        for (Hasher hasher : hashers) {
          hasher.putChar(c);
        }
        return this;
      }

      @Override
      public Hasher putUnencodedChars(CharSequence chars) {
        for (Hasher hasher : hashers) {
          hasher.putUnencodedChars(chars);
        }
        return this;
      }

      @Override

  public Hasher putLong(long l) {
    scratch.putLong(l);
    return update(Longs.BYTES);
  }

  @Override
  @CanIgnoreReturnValue
  public Hasher putChar(char c) {
    scratch.putChar(c);
    return update(Chars.BYTES);
  }

      // Start with "%--" and fill in the blanks
      char[] dest = new char[3];
      dest[0] = '%';
      dest[2] = UPPER_HEX_DIGITS[cp & 0xF];
      dest[1] = UPPER_HEX_DIGITS[cp >>> 4];
      return dest;
    } else if (cp <= 0x7ff) {
      // Two byte UTF-8 characters [cp >= 0x80 && cp <= 0x7ff]
      // Start with "%--%--" and fill in the blanks
      char[] dest = new char[6];
      dest[0] = '%';
      dest[3] = '%';

   * Returns a reader wrapping the given reader that only reads half of the maximum number of
   * characters that it could read in read(char[], int, int).
   */
  private static Reader newNonBufferFillingReader(Reader reader) {
    return new FilterReader(reader) {
      @Override
      public int read(char[] cbuf, int off, int len) throws IOException {

   * Returns a reader wrapping the given reader that only reads half of the maximum number of
   * characters that it could read in read(char[], int, int).
   */
  private static Reader newNonBufferFillingReader(Reader reader) {
    return new FilterReader(reader) {
      @Override
      public int read(char[] cbuf, int off, int len) throws IOException {

  /**
   * Convert this builder into an array of char[]s where the maximum index is the value of the
   * highest character that has been seen. The array will be sparse in the sense that any unseen
   * index will default to null.
   *
   * @return a "sparse" array that holds the replacement mappings.
   */
  public char[] @Nullable [] toArray() {
    char[][] result = new char[max + 1][];

  // original character value.
  @VisibleForTesting
  static char[][] createReplacementArray(Map<Character, String> map) {
    checkNotNull(map); // GWT specific check (do not optimize)
    if (map.isEmpty()) {
      return EMPTY_REPLACEMENT_ARRAY;
    }
    char max = Collections.max(map.keySet());
    char[][] replacements = new char[max + 1][];
    for (Character c : map.keySet()) {

    // read char by char
    CharSequenceReader reader = new CharSequenceReader(charSequence);
    for (int i = 0; i < expected.length(); i++) {
      assertEquals(expected.charAt(i), reader.read());
    }
    assertFullyRead(reader);

    // read all to one array
    reader = new CharSequenceReader(charSequence);
    char[] buf = new char[expected.length()];

final class Platform {

  private static final char[] CHAR_BUFFER = new char[1024];

  static char[] charBufferFromThreadLocal() {
    // ThreadLocal is not available to GWT, so we always reuse the same
    // instance.  It is always safe to return the same instance because
    // javascript is single-threaded, and only used by blocks that doesn't
    // involve async callbacks.
    return CHAR_BUFFER;
  }

  private Platform() {}

    }
  }

  public void testUtf8() {
    char[] charsA = new char[128];
    char[] charsB = new char[128];

    for (int i = 0; i < charsA.length; i++) {
      if (i < 100) {
        charsA[i] = 'a';
        charsB[i] = 'a';
      } else {
        // Both two-byte characters, but must be different
        charsA[i] = (char) (0x0180 + i);
        charsB[i] = (char) (0x0280 + i);
      }
    }