if (conscrypt != null) {
          return conscrypt
        }
      }

      if (isBouncyCastlePreferred) {
        val bc = BouncyCastlePlatform.buildIfSupported()

        if (bc != null) {
          return bc
        }
      }

      if (isOpenJSSEPreferred) {
        val openJSSE = OpenJSSEPlatform.buildIfSupported()

        if (openJSSE != null) {

      createDirectedGraph("ab", "bc", "cd", "da");

  /**
   * Same as {@link #CYCLE_GRAPH}, but with an extra a->c edge.
   *
   * <pre>{@code
   * |--------------|
   * v              |
   * a -> b -> c -> d
   * |         ^
   * |---------|
   * }</pre>
   */
  private static final SuccessorsFunction<Character> TWO_CYCLES_GRAPH =
      createDirectedGraph("ab", "ac", "bc", "cd", "da");

  /**

      createDirectedGraph("ab", "bc", "cd", "da");

  /**
   * Same as {@link #CYCLE_GRAPH}, but with an extra a->c edge.
   *
   * <pre>{@code
   * |--------------|
   * v              |
   * a -> b -> c -> d
   * |         ^
   * |---------|
   * }</pre>
   */
  private static final SuccessorsFunction<Character> TWO_CYCLES_GRAPH =
      createDirectedGraph("ab", "ac", "bc", "cd", "da");

  /**

# URL spec forbids the following.
# https://www.w3.org/Bugs/Public/show_bug.cgi?id=24257
http://\uff05\uff14\uff11.com
http://%ef%bc%85%ef%bc%94%ef%bc%91.com

# ...%00 in fullwidth should fail (also as escaped UTF-8 input)
http://\uff05\uff10\uff10.com
http://%ef%bc%85%ef%bc%90%ef%bc%90.com

# Basic IDN support, UTF-8 and UTF-16 input should be converted to IDN
http://\u4f60\u597d\u4f60\u597d  s:http p:/ h:xn--6qqa088eba

				// into a constant. E.g:
				//   BC 4,...
				// into
				//   BC $4,...
				prog.From = obj.Addr{
					Type:   obj.TYPE_CONST,
					Offset: p.getConstant(prog, op, &a[0]),
				}

			}

			// Likewise, fixup usage like:
			//   BC x,LT,...
			//   BC x,foo+2,...
			//   BC x,4
			//   BC x,$5
			// into
			//   BC x,CR0LT,...
			//   BC x,CR0EQ,...
			//   BC x,CR1LT,...

        this.errorContextCount = buffer[ bufferIndex + 2 ];
        bufferIndex += 4;

        int bc = SMBUtil.readInt4(buffer, bufferIndex);
        bufferIndex += 4;

        if ( bc > 0 ) {
            this.errorData = new byte[bc];
            System.arraycopy(buffer, bufferIndex, this.errorData, 0, bc);
            bufferIndex += bc;
        }
        return bufferIndex - start;
    }

	}
	defer xhttp.DrainBody(reader)

	b := bytebufferpool.Get()
	bc := bytebufferpool.Get()
	defer func() {
		b.Reset()
		bc.Reset()

		bytebufferpool.Put(b)
		bytebufferpool.Put(bc)
	}()

	w, err := zstd.NewWriter(bc)
	if err != nil {
		return nil, nil, err
	}

	if _, err = io.Copy(w, io.TeeReader(reader, b)); err != nil {

    //     [abc]de|[fgh] -> [fgh]de|[abc]. Now [fgh] is in the right place, but we need to swap [de]
    //     with [abc]: fgh[de]|a[bc] -> fgh[bc]|a[de]. Now we need to swap [a] with [bc]:
    //     fgh[b]c|[a]de -> fgh[a]c|[b]de. Finally we need to swap [c] with [b]:
    //     fgha[c]|[b]de -> fgha[b]|[c]de. Because these two blocks are the same size, we are done.

 *
 */
public class StringUtilTest {

    /**
     * @throws Exception
     */
    @Test
    public void testReplace() throws Exception {
        assertEquals("1", "1bc45", StringUtil.replace("12345", "23", "bc"));
        assertEquals("2", "1234ef", StringUtil.replace("12345", "5", "ef"));
        assertEquals("3", "ab2345", StringUtil.replace("12345", "1", "ab"));
        assertEquals("4", "a234a", StringUtil.replace("12341", "1", "a"));

        }.trustManagers.first() as X509TrustManager

      val sslContext =
        Platform.get().newSSLContext().apply {
          // TODO remove most of this code after https://github.com/bcgit/bc-java/issues/686
          init(null, arrayOf(trustManager), SecureRandom())
        }

      client =
        client.newBuilder()
          .sslSocketFactory(sslContext.socketFactory, trustManager)