Eric Van Norman <******@****.***> 1673639187 -0600

John Howard <******@****.***> 1718030154 -0700

Laura Kassovic <******@****.***> 1701107622 -0800

	rb.flushF = f
}

// reset discards all characters from the buffer.
func (rb *reorderBuffer) reset() {
	rb.nrune = 0
	rb.nbyte = 0
}

func (rb *reorderBuffer) doFlush() bool {
	if rb.f.composing {
		rb.compose()
	}
	res := rb.flushF(rb)
	rb.reset()
	return res
}

// appendFlush appends the normalized segment to rb.out.
func appendFlush(rb *reorderBuffer) bool {

	ROUND1(Rd, Ra, Rb, Rc,  1, 12, Rc1)
	ROUND1(Rc, Rd, Ra, Rb,  2, 17, Rc2)
	ROUND1(Rb, Rc, Rd, Ra,  3, 22, Rc3)

	MOVM.IA.W (Rtable), [Rc0,Rc1,Rc2,Rc3]
	ROUND1(Ra, Rb, Rc, Rd,  4,	7, Rc0)
	ROUND1(Rd, Ra, Rb, Rc,  5, 12, Rc1)
	ROUND1(Rc, Rd, Ra, Rb,  6, 17, Rc2)
	ROUND1(Rb, Rc, Rd, Ra,  7, 22, Rc3)

	MOVM.IA.W (Rtable), [Rc0,Rc1,Rc2,Rc3]
	ROUND1(Ra, Rb, Rc, Rd,  8,	7, Rc0)
	ROUND1(Rd, Ra, Rb, Rc,  9, 12, Rc1)

	rb.AppendRuleV6(command, chain, table, params...)
	return rb
}

func (rb *IptablesRuleBuilder) AppendRuleV6(command log.Command, chain string, table string, params ...string) *IptablesRuleBuilder {
	if !rb.cfg.EnableIPv6 {
		return rb
	}
	return rb.appendInternal(&rb.rules.rulesv6, command, chain, table, params...)
}

func (rb *IptablesRuleBuilder) buildRules(rules []*Rule) [][]string {
	output := make([][]string, 0)

	p := i.p + 1
	if p >= i.rb.nsrc {
		p0 := i.p
		i.setDone()
		return i.rb.src.bytes[p0:p]
	}
	if i.rb.src.bytes[p] < utf8.RuneSelf {
		p0 := i.p
		i.p = p
		return i.rb.src.bytes[p0:p]
	}
	i.info = i.rb.f.info(i.rb.src, i.p)
	i.next = i.rb.f.nextMain
	return i.next(i)
}

func nextASCIIString(i *Iter) []byte {
	p := i.p + 1
	if p >= i.rb.nsrc {
		i.buf[0] = i.rb.src.str[i.p]

	ROUND1x(Re, Ra, Rb, Rc, Rd)
	ROUND1x(Rd, Re, Ra, Rb, Rc)
	ROUND1x(Rc, Rd, Re, Ra, Rb)
	ROUND1x(Rb, Rc, Rd, Re, Ra)

	MOVW	$0x6ED9EBA1, Rconst
	MOVW	$4, Rctr
loop2:	ROUND2(Ra, Rb, Rc, Rd, Re)
	ROUND2(Re, Ra, Rb, Rc, Rd)
	ROUND2(Rd, Re, Ra, Rb, Rc)
	ROUND2(Rc, Rd, Re, Ra, Rb)
	ROUND2(Rb, Rc, Rd, Re, Ra)
	SUB.S	$1, Rctr
	BNE	loop2

	MOVW	$0x8F1BBCDC, Rconst
	MOVW	$4, Rctr
loop3:	ROUND3(Ra, Rb, Rc, Rd, Re)

# Usage

```go
package main

import (
	"fmt"

	"github.com/smallnest/ringbuffer"
)

func main() {
	rb := ringbuffer.New(1024)

	// write
	rb.Write([]byte("abcd"))
	fmt.Println(rb.Length())
	fmt.Println(rb.Free())

	// read
	buf := make([]byte, 4)
	rb.Read(buf)
	fmt.Println(string(buf))
}
```

It is possible to use an existing buffer with by replacing `New` with `NewBuffer`.

	Flags      uint32
	PathBuffer [1]uint16
}

// Path returns path stored in rb.
func (rb *SymbolicLinkReparseBuffer) Path() string {
	n1 := rb.SubstituteNameOffset / 2
	n2 := (rb.SubstituteNameOffset + rb.SubstituteNameLength) / 2
	return syscall.UTF16ToString((*[0xffff]uint16)(unsafe.Pointer(&rb.PathBuffer[0]))[n1:n2:n2])
}

type MountPointReparseBuffer struct {