StringBuilder result = new StringBuilder();
        int endA = endPrefix;
        while (endA < thisUrl.length()) {
            int pos = thisUrl.indexOf('/', endA);
            if (pos < 0) {
                break;
            }
            result.append("../");
            endA = pos + 1;
        }
        result.append(otherUrl.substring(endPrefix));

        return result.toString();
    }

	for i := 0; i < 4; i++ {
		digits[i] = byteorder.LeUint64(b[i*8:])
	}

	width := uint64(1 << w)
	windowMask := uint64(width - 1)

	pos := uint(0)
	carry := uint64(0)
	for pos < 256 {
		indexU64 := pos / 64
		indexBit := pos % 64
		var bitBuf uint64
		if indexBit < 64-w {
			// This window's bits are contained in a single u64
			bitBuf = digits[indexU64] >> indexBit
		} else {

				// the presence of these instructions.
				q = obj.Appendp(q, c.newprog)
				q.As = AWORD
				q.Pos = p.Pos
				q.From.Type = obj.TYPE_CONST
				q.From.Offset = 0x3c4c0000
				q = obj.Appendp(q, c.newprog)
				q.As = AWORD
				q.Pos = p.Pos
				q.From.Type = obj.TYPE_CONST
				q.From.Offset = 0x38420000
				rel := obj.Addrel(c.cursym)
				rel.Off = 0
				rel.Siz = 8

			pos:  1,
			want: 0,
		},
		{
			name: "ipv6 middle is a zero",
			ip:   netip.MustParseAddr("2001:db8::ff00:42:8329"),
			pos:  56,
			want: 0,
		},
		{
			name: "ipv6 middle is a one",
			ip:   netip.MustParseAddr("2001:db8::ff00:42:8329"),
			pos:  81,
			want: 1,
		},
		{
			name: "ipv6 last is a one",
			ip:   netip.MustParseAddr("2001:db8::ff00:42:8329"),
			pos:  128,

	What    uint16
	Name    [16]int8
}

type RtMsghdr struct {
	Msglen   uint16
	Version  uint8
	Type     uint8
	Hdrlen   uint16
	Index    uint16
	Tableid  uint16
	Priority uint8
	Mpls     uint8
	Addrs    int32
	Flags    int32
	Fmask    int32
	Pid      int32
	Seq      int32
	Errno    int32
	Inits    uint32
	Rmx      RtMetrics
}

type RtMetrics struct {
	Pksent   uint64

				q = obj.Appendp(q, newprog)
				q.As = mov
				q.Pos = p.Pos
				q.From.Type = obj.TYPE_REG
				q.From.Reg = REGLINK
				q.To.Type = obj.TYPE_MEM
				q.To.Offset = int64(-autosize)
				q.To.Reg = REGSP

				q = obj.Appendp(q, newprog)
				q.As = add
				q.Pos = p.Pos
				q.From.Type = obj.TYPE_CONST
				q.From.Offset = int64(-autosize)
				q.To.Type = obj.TYPE_REG

    // general escaper.
    builder.addEscape('&', "&");
    builder.addEscape('<', "&lt;");
    builder.addEscape('>', "&gt;");
    XML_CONTENT_ESCAPER = builder.build();
    builder.addEscape('\'', "&apos;");
    builder.addEscape('"', "&quot;");
    XML_ESCAPER = builder.build();
    builder.addEscape('\t', "&#x9;");
    builder.addEscape('\n', "&#xA;");
    builder.addEscape('\r', "&#xD;");

        assert open;
        return blockStore.readFirst(payloadType);
    }

    @Override
    public <T extends BlockPayload> T read(BlockPointer pos, Class<T> payloadType) {
        assert open;
        return blockStore.read(pos, payloadType);
    }

    @Override
    public void write(BlockPayload block) {
        assert open;
        blockStore.write(block);
    }

    @Override

			// Goldmark is strict about the id syntax.
			for _, c := range id {
				if c >= 0x80 || !isLetterDigit(byte(c)) {
					p.corner = true
				}
			}
		}
		pos := Position{p.lineno, p.lineno}
		p.doneBlock(&Heading{pos, n, p.newText(pos, s), id})
		return line{}, true
	}
	return s, false
}

// extractID removes an ID attribute from s if one is present.
// It returns the attribute value and the resulting string.

	What    uint16
	Name    [16]int8
}

type RtMsghdr struct {
	Msglen   uint16
	Version  uint8
	Type     uint8
	Hdrlen   uint16
	Index    uint16
	Tableid  uint16
	Priority uint8
	Mpls     uint8
	Addrs    int32
	Flags    int32
	Fmask    int32
	Pid      int32
	Seq      int32
	Errno    int32
	Inits    uint32
	Rmx      RtMetrics
}

type RtMetrics struct {
	Pksent   uint64