68 lines
1.5 KiB
Go
68 lines
1.5 KiB
Go
package krpc
|
|
|
|
import (
|
|
"encoding"
|
|
"fmt"
|
|
"reflect"
|
|
|
|
"github.com/anacrolix/missinggo/slices"
|
|
"github.com/anacrolix/torrent/bencode"
|
|
)
|
|
|
|
func unmarshalBencodedBinary(u encoding.BinaryUnmarshaler, b []byte) (err error) {
|
|
var ub string
|
|
err = bencode.Unmarshal(b, &ub)
|
|
if err != nil {
|
|
return
|
|
}
|
|
return u.UnmarshalBinary([]byte(ub))
|
|
}
|
|
|
|
type elemSizer interface {
|
|
ElemSize() int
|
|
}
|
|
|
|
func unmarshalBinarySlice(slice elemSizer, b []byte) (err error) {
|
|
sliceValue := reflect.ValueOf(slice).Elem()
|
|
elemType := sliceValue.Type().Elem()
|
|
bytesPerElem := slice.ElemSize()
|
|
for len(b) != 0 {
|
|
if len(b) < bytesPerElem {
|
|
err = fmt.Errorf("%d trailing bytes < %d required for element", len(b), bytesPerElem)
|
|
break
|
|
}
|
|
elem := reflect.New(elemType)
|
|
err = elem.Interface().(encoding.BinaryUnmarshaler).UnmarshalBinary(b[:bytesPerElem])
|
|
if err != nil {
|
|
return
|
|
}
|
|
sliceValue.Set(reflect.Append(sliceValue, elem.Elem()))
|
|
b = b[bytesPerElem:]
|
|
}
|
|
return
|
|
}
|
|
|
|
func marshalBinarySlice(slice elemSizer) (ret []byte, err error) {
|
|
var elems []encoding.BinaryMarshaler
|
|
slices.MakeInto(&elems, slice)
|
|
for _, e := range elems {
|
|
var b []byte
|
|
b, err = e.MarshalBinary()
|
|
if err != nil {
|
|
return
|
|
}
|
|
if len(b) != slice.ElemSize() {
|
|
panic(fmt.Sprintf("marshalled %d bytes, but expected %d", len(b), slice.ElemSize()))
|
|
}
|
|
ret = append(ret, b...)
|
|
}
|
|
return
|
|
}
|
|
|
|
func bencodeBytesResult(b []byte, err error) ([]byte, error) {
|
|
if err != nil {
|
|
return b, err
|
|
}
|
|
return bencode.Marshal(b)
|
|
}
|