neoneo-go/pkg/core/transaction/attribute.go
Anthony De Meulemeester 1a1a19da7d
Smartcontract (#39)
* deleted transfer_output added asset type and transaction result to core

* removed writing 0x00 when buffer length is 0

* Refactored emit into VM package + moved tx to own package.

* implemented transaction along with claimTransaction.

* refactored naming of transaction + added decode address for uint160 types

* removed unnecessary folder and files.

* transaction/smartcontract logic

* bumped version 0.24.0
2018-03-04 14:56:49 +01:00

79 lines
2.3 KiB
Go

package transaction
import (
"encoding/binary"
"errors"
"io"
"github.com/CityOfZion/neo-go/pkg/util"
)
// Attribute represents a Transaction attribute.
type Attribute struct {
Usage AttrUsage
Data []byte
}
// DecodeBinary implements the Payloader interface.
func (attr *Attribute) DecodeBinary(r io.Reader) error {
if err := binary.Read(r, binary.LittleEndian, &attr.Usage); err != nil {
return err
}
if attr.Usage == ContractHash ||
attr.Usage == Vote ||
(attr.Usage >= Hash1 && attr.Usage <= Hash15) {
attr.Data = make([]byte, 32)
return binary.Read(r, binary.LittleEndian, attr.Data)
}
if attr.Usage == ECDH02 || attr.Usage == ECDH03 {
attr.Data = make([]byte, 33)
attr.Data[0] = byte(attr.Usage)
return binary.Read(r, binary.LittleEndian, attr.Data[1:])
}
if attr.Usage == Script {
attr.Data = make([]byte, 20)
return binary.Read(r, binary.LittleEndian, attr.Data)
}
if attr.Usage == DescriptionUrl {
attr.Data = make([]byte, 1)
return binary.Read(r, binary.LittleEndian, attr.Data)
}
if attr.Usage == Description || attr.Usage >= Remark {
lenData := util.ReadVarUint(r)
attr.Data = make([]byte, lenData)
return binary.Read(r, binary.LittleEndian, attr.Data)
}
return errors.New("format error in decoding transaction attribute")
}
// EncodeBinary implements the Payload interface.
func (attr *Attribute) EncodeBinary(w io.Writer) error {
if err := binary.Write(w, binary.LittleEndian, &attr.Usage); err != nil {
return err
}
if attr.Usage == ContractHash ||
attr.Usage == Vote ||
(attr.Usage >= Hash1 && attr.Usage <= Hash15) {
return binary.Write(w, binary.LittleEndian, attr.Data)
}
if attr.Usage == ECDH02 || attr.Usage == ECDH03 {
attr.Data[0] = byte(attr.Usage)
return binary.Write(w, binary.LittleEndian, attr.Data[1:33])
}
if attr.Usage == Script {
return binary.Write(w, binary.LittleEndian, attr.Data)
}
if attr.Usage == DescriptionUrl {
if err := util.WriteVarUint(w, uint64(len(attr.Data))); err != nil {
return err
}
return binary.Write(w, binary.LittleEndian, attr.Data)
}
if attr.Usage == Description || attr.Usage >= Remark {
if err := util.WriteVarUint(w, uint64(len(attr.Data))); err != nil {
return err
}
return binary.Write(w, binary.LittleEndian, attr.Data)
}
return errors.New("format error in encoding transaction attribute")
}