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package iana
import (
"fmt"
"strings"
"github.com/u-root/u-root/pkg/uio"
)
// Arch encodes an architecture type per RFC 4578, Section 2.1.
type Arch uint16
// See RFC 4578.
const (
INTEL_X86PC Arch = 0
NEC_PC98 Arch = 1
EFI_ITANIUM Arch = 2
DEC_ALPHA Arch = 3
ARC_X86 Arch = 4
INTEL_LEAN_CLIENT Arch = 5
EFI_IA32 Arch = 6
EFI_BC Arch = 7
EFI_XSCALE Arch = 8
EFI_X86_64 Arch = 9
)
// archTypeToStringMap maps an Arch to a mnemonic name
var archTypeToStringMap = map[Arch]string{
INTEL_X86PC: "Intel x86PC",
NEC_PC98: "NEC/PC98",
EFI_ITANIUM: "EFI Itanium",
DEC_ALPHA: "DEC Alpha",
ARC_X86: "Arc x86",
INTEL_LEAN_CLIENT: "Intel Lean Client",
EFI_IA32: "EFI IA32",
EFI_BC: "EFI BC",
EFI_XSCALE: "EFI Xscale",
EFI_X86_64: "EFI x86-64",
}
// String returns a mnemonic name for a given architecture type.
func (a Arch) String() string {
if at := archTypeToStringMap[a]; at != "" {
return at
}
return "unknown"
}
// Archs represents multiple Arch values.
type Archs []Arch
// Contains returns whether b is one of the Archs in a.
func (a Archs) Contains(b Arch) bool {
for _, t := range a {
if t == b {
return true
}
}
return false
}
// ToBytes returns the serialized option defined by RFC 4578 (DHCPv4) and RFC
// 5970 (DHCPv6) as the Client System Architecture Option.
func (a Archs) ToBytes() []byte {
buf := uio.NewBigEndianBuffer(nil)
for _, at := range a {
buf.Write16(uint16(at))
}
return buf.Data()
}
// String returns the list of archs in a human-readable manner.
func (a Archs) String() string {
s := make([]string, 0, len(a))
for _, arch := range a {
s = append(s, arch.String())
}
return strings.Join(s, ", ")
}
// FromBytes parses a DHCP list of architecture types as defined by RFC 4578
// and RFC 5970.
func (a *Archs) FromBytes(data []byte) error {
buf := uio.NewBigEndianBuffer(data)
if buf.Len() == 0 {
return fmt.Errorf("must have at least one archtype if option is present")
}
*a = make([]Arch, 0, buf.Len()/2)
for buf.Has(2) {
*a = append(*a, Arch(buf.Read16()))
}
return buf.FinError()
}
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