7 "github.com/vapor/crypto/sha3pool"
8 "github.com/vapor/encoding/blockchain"
9 "github.com/vapor/errors"
10 "github.com/vapor/protocol/bc"
13 // OutputCommitment contains the commitment data for a transaction output.
14 type OutputCommitment struct {
20 func (oc *OutputCommitment) writeExtensibleString(w io.Writer, suffix []byte, assetVersion uint64) error {
21 _, err := blockchain.WriteExtensibleString(w, suffix, func(w io.Writer) error {
22 return oc.writeContents(w, suffix, assetVersion)
27 func (oc *OutputCommitment) writeContents(w io.Writer, suffix []byte, assetVersion uint64) (err error) {
28 if assetVersion == 1 {
29 if _, err = oc.AssetAmount.WriteTo(w); err != nil {
30 return errors.Wrap(err, "writing asset amount")
32 if _, err = blockchain.WriteVarint63(w, oc.VMVersion); err != nil {
33 return errors.Wrap(err, "writing vm version")
35 if _, err = blockchain.WriteVarstr31(w, oc.ControlProgram); err != nil {
36 return errors.Wrap(err, "writing control program")
40 _, err = w.Write(suffix)
42 return errors.Wrap(err, "writing suffix")
45 func (oc *OutputCommitment) readFrom(r *blockchain.Reader, assetVersion uint64) (suffix []byte, err error) {
46 return blockchain.ReadExtensibleString(r, func(r *blockchain.Reader) error {
47 if assetVersion == 1 {
48 if err := oc.AssetAmount.ReadFrom(r); err != nil {
49 return errors.Wrap(err, "reading asset+amount")
51 oc.VMVersion, err = blockchain.ReadVarint63(r)
53 return errors.Wrap(err, "reading VM version")
55 if oc.VMVersion != 1 {
56 return fmt.Errorf("unrecognized VM version %d for asset version 1", oc.VMVersion)
58 oc.ControlProgram, err = blockchain.ReadVarstr31(r)
59 return errors.Wrap(err, "reading control program")
65 // Hash convert suffix && assetVersion to bc.Hash
66 func (oc *OutputCommitment) Hash(suffix []byte, assetVersion uint64) (outputhash bc.Hash) {
67 h := sha3pool.Get256()
68 defer sha3pool.Put256(h)
69 oc.writeExtensibleString(h, suffix, assetVersion)
70 outputhash.ReadFrom(h)