ipv4.go

package ipformat

import (
	"strconv"
	"strings"
)

// ToV4 converts ipv6 to ipv4
func (ip IP) ToV4() (IP, error) {
	if ip.TypeV6 == false {
		return ip, nil
	}

	// start of ipv4
	var newParts []string

	// Loop through the old parts converting to ipv4
	for i, part := range ip.Parts {

		// turn the string into a int
		intConverted, _ := strconv.ParseInt(part, 16, 0)
		ip.Parts[i] = strconv.FormatInt(intConverted, 10)

		// Make sure that no 0s are missing
		if len(ip.Parts[i]) == 1 {
			ip.Parts[i] = "0" + ip.Parts[i]
		}
	}

	//Set the parts to ipv6
	newParts = append(newParts, ip.Parts[0]+ip.Parts[1])
	newParts = append(newParts, ip.Parts[2]+ip.Parts[3])
	ip.Parts = newParts

	ip.TypeV6 = true

	ip.Address = strings.Join(ip.Parts, ":")

	if ip.Range {
		// Convert cidr to ipv6
		ip.CIDR = 128 - (32 - ip.CIDR)
		ip.Address = ip.Address + "/" + strconv.FormatInt(ip.CIDR, 10)
	}

	// return the new ip address
	return ip, nil
}