* fills, it is doubled.
 */
@Suppress("NAME_SHADOWING")
object Hpack {
  private const val PREFIX_4_BITS = 0x0f
  private const val PREFIX_5_BITS = 0x1f
  private const val PREFIX_6_BITS = 0x3f
  private const val PREFIX_7_BITS = 0x7f

  private const val SETTINGS_HEADER_TABLE_SIZE = 4_096

  /**
   * The decoder has ultimate control of the maximum size of the dynamic table but we can choose

  }

  public void testEncodedLength_validStrings2() {
    HashMap<Integer, Integer> utf8Lengths = new HashMap<>();
    utf8Lengths.put(0x00, 1);
    utf8Lengths.put(0x7f, 1);
    utf8Lengths.put(0x80, 2);
    utf8Lengths.put(0x7ff, 2);
    utf8Lengths.put(0x800, 3);
    utf8Lengths.put(MIN_SUPPLEMENTARY_CODE_POINT - 1, 3);
    utf8Lengths.put(MIN_SUPPLEMENTARY_CODE_POINT, 4);
    utf8Lengths.put(MAX_CODE_POINT, 4);

  // is masked in order to correspond to the current table size. For example, if the table size
  // is 128 then the mask is 127 == 0x7f, keeping the bottom 7 bits of the hash value.
  // If a key hashes to 0x89abcdef the mask reduces it to 0x89abcdef & 0x7f == 0x6f. We'll call this
  // the "short hash".
  //
  // The `keys`, `values`, and `entries` arrays always have the same size as each other. They can be

    testDecodes(base64(), "Zg====", "f");
  }

  public void testBase64InvalidDecodings() {
    // These contain bytes not in the decodabet.
    assertFailsToDecode(base64(), "A\u007f", "Unrecognized character: 0x7f");
    assertFailsToDecode(base64(), "Wf2!", "Unrecognized character: !");
    // This sentence just isn't base64() encoded.
    assertFailsToDecode(base64(), "let's not talk of love or chains!");

  @Test
  fun dynamicallyGrowsBeyond64Entries() {
    // Lots of headers need more room!
    hpackReader = Hpack.Reader(bytesIn, 16384, 4096)
    bytesIn.writeByte(0x3F) // Dynamic table size update (size = 16384).
    bytesIn.writeByte(0xE1)
    bytesIn.writeByte(0x7F)
    for (i in 0..255) {
      bytesIn.writeByte(0x40) // Literal indexed
      bytesIn.writeByte(0x0a) // Literal name (len = 10)
      bytesIn.writeUtf8("custom-foo")

  // is masked in order to correspond to the current table size. For example, if the table size
  // is 128 then the mask is 127 == 0x7f, keeping the bottom 7 bits of the hash value.
  // If a key hashes to 0x89abcdef the mask reduces it to 0x89abcdef & 0x7f == 0x6f. We'll call this
  // the "short hash".
  //
  // The `keys`, `values`, and `entries` arrays always have the same size as each other. They can be

    testDecodes(base64(), "Zg====", "f");
  }

  public void testBase64InvalidDecodings() {
    // These contain bytes not in the decodabet.
    assertFailsToDecode(base64(), "A\u007f", "Unrecognized character: 0x7f");
    assertFailsToDecode(base64(), "Wf2!", "Unrecognized character: !");
    // This sentence just isn't base64() encoded.
    assertFailsToDecode(base64(), "let's not talk of love or chains!");

      encodings[ 0x1c] = encoding // File Separator
      encodings[ 0x1d] = encoding // Group Separator
      encodings[ 0x1e] = encoding // Record Separator
      encodings[ 0x1f] = encoding // Unit Separator
      encodings[ 0x7f] = encoding // Delete
    }

  fun nonAscii(encoding: Encoding) =
    apply {
      encodings[UNICODE_2] = encoding
      encodings[UNICODE_3] = encoding

import com.google.common.annotations.GwtCompatible;
import java.nio.charset.StandardCharsets;

/**
 * Static methods pertaining to ASCII characters (those in the range of values {@code 0x00} through
 * {@code 0x7F}), and to strings containing such characters.
 *
 * <p>ASCII utilities also exist in other classes of this package:
 *
 * <ul>
 *   <!-- TODO(kevinb): how can we make this not produce a warning when building gwt javadoc? -->

      0x5,
      0x25,
      0x26,
      0x27,
      0x6,
      0x74,
      0x75,
      0x28,
      0x29,
      0x2a,
      0x7,
      0x2b,
      0x76,
      0x2c,
      0x8,
      0x9,
      0x2d,
      0x77,
      0x78,
      0x79,
      0x7a,
      0x7b,
      0x7ffe,
      0x7fc,
      0x3ffd,
      0x1ffd,
      0xffffffc,
      0xfffe6,