forked from anacrolix/dht
/
compact_node_info.go
49 lines (43 loc) · 1007 Bytes
/
compact_node_info.go
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package krpc
import (
"bytes"
"encoding/binary"
"errors"
"fmt"
"github.com/anacrolix/torrent/bencode"
)
type CompactIPv4NodeInfo []NodeInfo
var _ bencode.Unmarshaler = &CompactIPv4NodeInfo{}
func (i *CompactIPv4NodeInfo) UnmarshalBencode(_b []byte) (err error) {
var b []byte
err = bencode.Unmarshal(_b, &b)
if err != nil {
return
}
if len(b)%CompactIPv4NodeInfoLen != 0 {
err = fmt.Errorf("bad length: %d", len(b))
return
}
for k := 0; k < len(b); k += CompactIPv4NodeInfoLen {
var ni NodeInfo
err = ni.UnmarshalCompactIPv4(b[k : k+CompactIPv4NodeInfoLen])
if err != nil {
return
}
*i = append(*i, ni)
}
return
}
func (i CompactIPv4NodeInfo) MarshalBencode() (ret []byte, err error) {
var buf bytes.Buffer
for _, ni := range i {
buf.Write(ni.ID[:])
if ni.Addr == nil {
err = errors.New("nil addr in node info")
return
}
buf.Write(ni.Addr.IP.To4())
binary.Write(&buf, binary.BigEndian, uint16(ni.Addr.Port))
}
return bencode.Marshal(buf.Bytes())
}