b2bit8 && b3bit8 -> 127
          b3bit8 -> 126
          b2bit8 -> 125
          else -> 124
        }
      }

    val b2: Int
      get() = mappedTo[0] and 0x7f

    val b3: Int
      get() = mappedTo[1] and 0x7f
  }

  data class InlineDelta(
    override val rangeStart: Int,
    val codepointDelta: Int,
  ) : MappedRange {
    private val absoluteDelta = abs(codepointDelta)

    sectionIndexBuffer.writeByte((section and 0x3f80) shr 7)

    // Section index.
    sectionIndexBuffer.writeByte((sectionOffset and 0x3f80) shr 7)
    sectionIndexBuffer.writeByte(sectionOffset and 0x7f)

    // Ranges.
    for (range in sectionMappedRanges) {
      rangesBuffer.writeByte(range.rangeStart)

      when (range) {
        is MappedRange.Constant -> {
          rangesBuffer.writeByte(range.b1)

            //     || byte1 == (byte) 0xF4 && byte2 > (byte) 0x8F)
            || (((byte1 << 28) + (byte2 - (byte) 0x90)) >> 30) != 0
            // Third byte trailing-byte test
            || bytes[index++] > (byte) 0xBF
            // Fourth byte trailing-byte test
            || bytes[index++] > (byte) 0xBF) {
          return false;
        }
      }
    }
  }

      }

      while (!encodedCharBuffer.exhausted()) {
        val b = encodedCharBuffer.readByte().toInt() and 0xff
        writeByte('%'.code)
        writeByte(HEX_DIGITS[b shr 4 and 0xf].code)
        writeByte(HEX_DIGITS[b and 0xf].code)
      }
    } else {
      // This character doesn't need encoding. Just copy it over.
      writeUtf8CodePoint(codePoint)
    }

 * 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

0x2d, 0x69, 0x6e, 0x6c, 0x69, 0x6e, 0x65, 0x2d, 0x64, 0x61, 0x74, 0x61, 0xc4, 0x4, 0x74, 0x72, 0x75, 0x65, 0xa7, 0x4d, 0x65, 0x74, 0x61, 0x55, 0x73, 0x72, 0x82, 0xac, 0x63, 0x6f, 0x6e, 0x74, 0x65, 0x6e, 0x74, 0x2d, 0x74, 0x79, 0x70, 0x65, 0xb8, 0x61, 0x70, 0x70, 0x6c, 0x69, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x2f, 0x6f, 0x63, 0x74, 0x65, 0x74, 0x2d, 0x73, 0x74, 0x72, 0x65, 0x61, 0x6d, 0xa4, 0x65, 0x74, 0x61, 0x67, 0xd9, 0x20, 0x36, 0x64, 0x31, 0x31, 0x61, 0x34, 0x35, 0x31, 0x62, 0x30, 0x62, 0x32, 0x34,...

    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!");

    assertBytes(
      // Dynamic table size update (size = 2048).
      0x3F, 0xE1, 0xF,
      0x40, 3, 'f'.code, 'o'.code, 'o'.code, 3, 'b'.code, 'a'.code, 'r'.code,
    )
    hpackWriter!!.resizeHeaderTable(8192)
    hpackWriter!!.writeHeaders(listOf(Header("bar", "foo")))
    assertBytes(
      // Dynamic table size update (size = 8192).
      0x3F, 0xE1, 0x3F,
      0x40, 3, 'b'.code, 'a'.code, 'r'.code, 3, 'f'.code, 'o'.code, 'o'.code,

   * prefix, or when one array is a prefix of the other, treats the shorter array as the lesser. For
   * example, {@code [] < [0x01] < [0x01, 0x80] < [0x01, 0x7F] < [0x02]}. Values are treated as
   * signed.
   *
   * <p>The returned comparator is inconsistent with {@link Object#equals(Object)} (since arrays
   * support only identity equality), but it is consistent with {@link

  val sourceCodePoint1: Int,
  val type: Int,
  val mappedTo: ByteString,
) {
  val section: Int
    get() = sourceCodePoint0 and 0x1fff80

  val rangeStart: Int
    get() = sourceCodePoint0 and 0x7f

  val hasSingleSourceCodePoint: Boolean
    get() = sourceCodePoint0 == sourceCodePoint1

  val spansSections: Boolean
    get() = (sourceCodePoint0 and 0x1fff80) != (sourceCodePoint1 and 0x1fff80)