7 "github.com/vapor/encoding/blockchain"
8 "github.com/vapor/errors"
9 "github.com/vapor/protocol/bc"
12 // SpendCommitment contains the commitment data for a transaction output.
13 type SpendCommitment struct {
21 func (sc *SpendCommitment) writeExtensibleString(w io.Writer, suffix []byte, assetVersion uint64) error {
22 _, err := blockchain.WriteExtensibleString(w, suffix, func(w io.Writer) error {
23 return sc.writeContents(w, suffix, assetVersion)
28 func (sc *SpendCommitment) writeContents(w io.Writer, suffix []byte, assetVersion uint64) (err error) {
29 if assetVersion == 1 {
30 if _, err = sc.SourceID.WriteTo(w); err != nil {
31 return errors.Wrap(err, "writing source id")
33 if _, err = sc.AssetAmount.WriteTo(w); err != nil {
34 return errors.Wrap(err, "writing asset amount")
36 if _, err = blockchain.WriteVarint63(w, sc.SourcePosition); err != nil {
37 return errors.Wrap(err, "writing source position")
39 if _, err = blockchain.WriteVarint63(w, sc.VMVersion); err != nil {
40 return errors.Wrap(err, "writing vm version")
42 if _, err = blockchain.WriteVarstr31(w, sc.ControlProgram); err != nil {
43 return errors.Wrap(err, "writing control program")
47 _, err = w.Write(suffix)
49 return errors.Wrap(err, "writing suffix")
52 func (sc *SpendCommitment) readFrom(r *blockchain.Reader, assetVersion uint64) (suffix []byte, err error) {
53 return blockchain.ReadExtensibleString(r, func(r *blockchain.Reader) error {
54 if assetVersion == 1 {
55 if _, err := sc.SourceID.ReadFrom(r); err != nil {
56 return errors.Wrap(err, "reading source id")
58 if err = sc.AssetAmount.ReadFrom(r); err != nil {
59 return errors.Wrap(err, "reading asset+amount")
61 if sc.SourcePosition, err = blockchain.ReadVarint63(r); err != nil {
62 return errors.Wrap(err, "reading source position")
64 if sc.VMVersion, err = blockchain.ReadVarint63(r); err != nil {
65 return errors.Wrap(err, "reading VM version")
67 if sc.VMVersion != 1 {
68 return fmt.Errorf("unrecognized VM version %d for asset version 1", sc.VMVersion)
70 if sc.ControlProgram, err = blockchain.ReadVarstr31(r); err != nil {
71 return errors.Wrap(err, "reading control program")