00000010  6c 59 bb fa b7 73 8b d6  fa b2 ca c1 0c d3 60 cf  |lY...s........`.|
00000020  50 18 a6 6f 3d b3 46 a1  06 a2 b1 62 4c ea 88 2f  |P..o=.F....bL../|
00000030  95 bc 35 6f 55 a6 8a 52  69 6c 5b a5 fc 94 2a b6  |..5oU..Ril[...*.|
00000040  27 7c d7 95 27 72 d4 c1  f2 f9 9c a5 b3 2a 85 52  |'|..'r.......*.R|
00000050  ae bf 14 52 54 51 6a fe  a1 99 05                 |...RTQj....|
>>> Flow 5 (client to server)

          rangesBuffer.writeByte(range.b1)
          rangesBuffer.writeByte(range.b2)
          rangesBuffer.writeByte(range.b3)
        }
        is MappedRange.InlineDelta -> {
          rangesBuffer.writeByte(range.b1)
          rangesBuffer.writeByte(range.b2)
          rangesBuffer.writeByte(range.b3)
        }
        is MappedRange.External -> {
          // Write the mapping.
          val mappingOffset: Int

00000250  24 3a 00 bc cf 9c 7d b7  40 20 01 5f aa d3 16 61  |$:....}.@ ._...a|
00000260  09 a2 76 fd 13 c3 cc e1  0c 5c ee b1 87 82 f1 6c  |..v......\.....l|
00000270  04 ed 73 bb b3 43 77 8d  0c 1c f1 0f a1 d8 40 83  |..s..Cw.......@.|
00000280  61 c9 4c 72 2b 9d ae db  46 06 06 4d f4 c1 b3 3e  |a.Lr+...F..M...>|
00000290  c0 d1 bd 42 d4 db fe 3d  13 60 84 5c 21 d3 3b e9  |...B...=.`.\!.;.|
000002a0  fa e7 16 03 03 00 ac 0c  00 00 a8 03 00 1d 20 2f  |.............. /|

        return when {
          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)

  @Override
  public int readInt() throws IOException {
    byte b1 = readAndCheckByte();
    byte b2 = readAndCheckByte();
    byte b3 = readAndCheckByte();
    byte b4 = readAndCheckByte();

    return Ints.fromBytes(b4, b3, b2, b1);
  }

  /**
   * Reads a {@code long} as specified by {@link DataInputStream#readLong()}, except using
   * little-endian byte order.
   *

000003a0  d8 27 88 4c e2 c7 42 9d  08 75 62 49 df fa 84 e8  |.'.L..B..ubI....|
000003b0  11 17 03 03 00 35 39 db  59 c8 ab 08 33 da 2c 19  |.....59.Y...3.,.|
000003c0  04 10 bb 18 b3 10 78 4b  2c a2 2b a2 e2 67 d1 6f  |......xK,.+..g.o|
000003d0  07 9c 0b d2 e1 24 a8 ac  7b ce 77 55 7d b8 b3 9b  |.....$..{.wU}...|
000003e0  82 7f bc 18 7a 61 a8 28  e2 a9 1e 17 03 03 00 8b  |....za.(........|
000003f0  6e a6 11 39 b9 d7 7b a0  67 76 c2 a6 d0 e4 c4 ba  |n..9..{.gv......|

  @Override
  public int readInt() throws IOException {
    byte b1 = readAndCheckByte();
    byte b2 = readAndCheckByte();
    byte b3 = readAndCheckByte();
    byte b4 = readAndCheckByte();

    return Ints.fromBytes(b4, b3, b2, b1);
  }

  /**
   * Reads a {@code long} as specified by {@link DataInputStream#readLong()}, except using
   * little-endian byte order.
   *

00000250  c9 86 2e dd d7 11 69 7f  85 7c 56 de fb 31 78 2b  |......i..|V..1x+|
00000260  e4 c7 78 0d ae cb be 9e  4e 36 24 31 7b 6a 0f 39  |..x.....N6$1{j.9|
00000270  95 12 07 8f 2a 16 03 03  00 b7 0c 00 00 b3 03 00  |....*...........|
00000280  1d 20 de df 32 23 35 b3  79 a9 49 c2 b3 ad 0c d6  |. ..2#5.y.I.....|
00000290  23 a6 6a 9b 0f e3 52 51  7b bc f2 79 00 c9 a4 a0  |#.j...RQ{..y....|
000002a0  94 02 04 03 00 8b 30 81  88 02 42 01 8c 12 91 28  |......0...B....(|

00000250  01 5f aa d3 16 61 09 a2  76 fd 13 c3 cc e1 0c 5c  |._...a..v......\|
00000260  ee b1 87 82 f1 6c 04 ed  73 bb b3 43 77 8d 0c 1c  |.....l..s..Cw...|
00000270  f1 0f a1 d8 40 83 61 c9  4c 72 2b 9d ae db 46 06  |******@****.***+...F.|
00000280  06 4d f4 c1 b3 3e c0 d1  bd 42 d4 db fe 3d 13 60  |.M...>...B...=.`|
00000290  84 5c 21 d3 3b e9 fa e7  16 03 03 00 04 0e 00 00  |.\!.;...........|

000002a0  24 bd 0c ad 24 cc 1c a7  fb 03 eb 0a 0d f4 30 96  |$...$.........0.|
000002b0  8d 28 a1 b3 64 ba 30 27  95 29 23 22 91 62 c3 1f  |.(..d.0'.)#".b..|
000002c0  51 aa c8 be 17 85 31 8e  f5 40 3e 02 42 00 ee a1  |Q.....1..@>.B...|
000002d0  64 14 a1 52 b3 e5 54 c9  24 53 94 5a 43 d8 4f 79  |d..R..T.$S.ZC.Oy|
000002e0  69 4b a8 51 ee de b3 b0  f7 1a 57 a3 28 72 d2 13  |iK.Q......W.(r..|