You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: segment.go
    path of file: ./repos/v2ray-core/transport/internet/kcp
    
    the code of the file until where you have to start completion: // +build !confonly

package kcp

import (
	"encoding/binary"

	"v2ray.com/core/common/buf"
)

// Command is a KCP command that indi
    
func (s *AckSegment) parse(conv uint16, cmd Command, opt SegmentOption, buf []byte) (bool, []byte) {
	s.Conv = conv
	s.Option = opt
	if len(buf) < 13 {
		return false, nil
	}

	s.ReceivingWindow = binary.BigEndian.Uint32(buf)
	buf = buf[4:]

	s.ReceivingNext = binary.BigEndian.Uint32(buf)
	buf = buf[4:]

	s.Timestamp = binary.BigEndian.Uint32(buf)
	buf = buf[4:]

	count := int(buf[0])
	buf = buf[1:]

	if len(buf) < count*4 {
		return false, nil
	}
	for i := 0; i < count; i++ {
		s.PutNumber(binary.BigEndian.Uint32(buf))
		buf = buf[4:]
	}

	return true, buf
}