lnd.xprv/lnwire/outpoint.go

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package lnwire
import (
"encoding/binary"
"fmt"
"io"
"math"
"github.com/roasbeef/btcd/chaincfg/chainhash"
"github.com/roasbeef/btcd/wire"
)
// WriteOutPoint serializes a wire.OutPoint struct into the passed io.Writer
// stream.
func WriteOutPoint(w io.Writer, o *wire.OutPoint) error {
if _, err := w.Write(o.Hash[:chainhash.HashSize]); err != nil {
return err
}
if o.Index > math.MaxUint16 {
return fmt.Errorf("index for outpoint (%v) is "+
"greater than max index of %v", o.Index, math.MaxUint16)
}
var idx [2]byte
binary.BigEndian.PutUint16(idx[:], uint16(o.Index))
if _, err := w.Write(idx[:]); err != nil {
return err
}
return nil
}
// ReadOutPoint deserializes a wire.OutPoint struct from the passed io.Reader
// stream.
func ReadOutPoint(r io.Reader, o *wire.OutPoint) error {
var h [chainhash.HashSize]byte
if _, err := io.ReadFull(r, h[:]); err != nil {
return err
}
hash, err := chainhash.NewHash(h[:])
if err != nil {
return err
}
var idxBytes [2]byte
_, err = io.ReadFull(r, idxBytes[:])
if err != nil {
return err
}
index := binary.BigEndian.Uint16(idxBytes[:])
*o = wire.OutPoint{
Hash: *hash,
Index: uint32(index),
}
return nil
}