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address.go
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/
address.go
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package http
import (
"encoding/base32"
"encoding/binary"
"errors"
"fmt"
"github.com/sigurn/crc16"
"strings"
)
var crc16table = crc16.MakeTable(crc16.CRC16_XMODEM)
func ParseADNLAddress(addr string) ([]byte, error) {
if len(addr) != 55 {
return nil, errors.New("wrong id length")
}
buf, err := base32.StdEncoding.DecodeString("F" + strings.ToUpper(addr))
if err != nil {
return nil, fmt.Errorf("failed to decode address: %w", err)
}
if buf[0] != 0x2d {
return nil, errors.New("invalid first byte")
}
hash := binary.BigEndian.Uint16(buf[33:])
calc := crc16.Checksum(buf[:33], crc16table)
if hash != calc {
return nil, errors.New("invalid address")
}
return buf[1:33], nil
}
func SerializeADNLAddress(addr []byte) (string, error) {
a := append([]byte{0x2d}, addr...)
crcBytes := make([]byte, 2)
binary.BigEndian.PutUint16(crcBytes, crc16.Checksum(a, crc16table))
return strings.ToLower(base32.StdEncoding.EncodeToString(append(a, crcBytes...))[1:]), nil
}