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package dhcpv6
import (
"errors"
"fmt"
"strings"
"github.com/u-root/u-root/pkg/uio"
)
// OptVendorClass represents a DHCPv6 Vendor Class option
type OptVendorClass struct {
EnterpriseNumber uint32
Data [][]byte
}
// Code returns the option code
func (op *OptVendorClass) Code() OptionCode {
return OptionVendorClass
}
// ToBytes serializes the option and returns it as a sequence of bytes
func (op *OptVendorClass) ToBytes() []byte {
buf := uio.NewBigEndianBuffer(nil)
buf.Write16(uint16(OptionVendorClass))
buf.Write16(uint16(op.Length()))
buf.Write32(uint32(op.EnterpriseNumber))
for _, data := range op.Data {
buf.Write16(uint16(len(data)))
buf.WriteBytes(data)
}
return buf.Data()
}
// Length returns the option length
func (op *OptVendorClass) Length() int {
ret := 0
for _, data := range op.Data {
ret += 2 + len(data)
}
return 4 + ret
}
// String returns a string representation of the VendorClass data
func (op *OptVendorClass) String() string {
vcStrings := make([]string, 0)
for _, data := range op.Data {
vcStrings = append(vcStrings, string(data))
}
return fmt.Sprintf("OptVendorClass{enterprisenum=%d, data=[%s]}", op.EnterpriseNumber, strings.Join(vcStrings, ", "))
}
// ParseOptVendorClass builds an OptVendorClass structure from a sequence of
// bytes. The input data does not include option code and length bytes.
func ParseOptVendorClass(data []byte) (*OptVendorClass, error) {
var opt OptVendorClass
buf := uio.NewBigEndianBuffer(data)
opt.EnterpriseNumber = buf.Read32()
for buf.Has(2) {
len := buf.Read16()
opt.Data = append(opt.Data, buf.CopyN(int(len)))
}
if len(opt.Data) < 1 {
return nil, errors.New("ParseOptVendorClass: at least one vendor class data is required")
}
return &opt, buf.FinError()
}
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