103 lines
2.8 KiB
Go
103 lines
2.8 KiB
Go
package transaction
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import (
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"encoding/hex"
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"encoding/json"
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"fmt"
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"io"
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"github.com/CityOfZion/neo-go/pkg/util"
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)
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// Attribute represents a Transaction attribute.
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type Attribute struct {
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Usage AttrUsage
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Data []byte
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}
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// DecodeBinary implements the Payload interface.
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func (attr *Attribute) DecodeBinary(r io.Reader) error {
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br := util.BinReader{R: r}
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br.ReadLE(&attr.Usage)
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// very special case
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if attr.Usage == ECDH02 || attr.Usage == ECDH03 {
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attr.Data = make([]byte, 33)
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attr.Data[0] = byte(attr.Usage)
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br.ReadLE(attr.Data[1:])
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return br.Err
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}
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var datasize uint64
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switch attr.Usage {
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case ContractHash, Vote, Hash1, Hash2, Hash3, Hash4, Hash5,
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Hash6, Hash7, Hash8, Hash9, Hash10, Hash11, Hash12, Hash13,
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Hash14, Hash15:
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datasize = 32
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case Script:
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datasize = 20
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case DescriptionURL:
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// It's not VarUint as per C# implementation, dunno why
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var urllen uint8
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br.ReadLE(&urllen)
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datasize = uint64(urllen)
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case Description, Remark, Remark1, Remark2, Remark3, Remark4,
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Remark5, Remark6, Remark7, Remark8, Remark9, Remark10, Remark11,
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Remark12, Remark13, Remark14, Remark15:
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datasize = br.ReadVarUint()
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default:
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return fmt.Errorf("failed decoding TX attribute usage: 0x%2x", int(attr.Usage))
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}
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attr.Data = make([]byte, datasize)
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br.ReadLE(attr.Data)
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return br.Err
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}
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// EncodeBinary implements the Payload interface.
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func (attr *Attribute) EncodeBinary(w io.Writer) error {
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bw := util.BinWriter{W: w}
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bw.WriteLE(&attr.Usage)
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switch attr.Usage {
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case ECDH02, ECDH03:
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bw.WriteLE(attr.Data[1:])
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case Description, Remark, Remark1, Remark2, Remark3, Remark4,
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Remark5, Remark6, Remark7, Remark8, Remark9, Remark10, Remark11,
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Remark12, Remark13, Remark14, Remark15:
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bw.WriteBytes(attr.Data)
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case DescriptionURL:
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var urllen = uint8(len(attr.Data))
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bw.WriteLE(urllen)
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fallthrough
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case Script, ContractHash, Vote, Hash1, Hash2, Hash3, Hash4, Hash5, Hash6,
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Hash7, Hash8, Hash9, Hash10, Hash11, Hash12, Hash13, Hash14, Hash15:
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bw.WriteLE(attr.Data)
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default:
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return fmt.Errorf("failed encoding TX attribute usage: 0x%2x", attr.Usage)
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}
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return bw.Err
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}
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// Size returns the size in number bytes of the Attribute
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func (attr *Attribute) Size() int {
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sz := 1 // usage
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switch attr.Usage {
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case ContractHash, ECDH02, ECDH03, Vote,
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Hash1, Hash2, Hash3, Hash4, Hash5, Hash6, Hash7, Hash8, Hash9, Hash10, Hash11, Hash12, Hash13, Hash14, Hash15:
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sz += 32 // uint8 + 32 = size(attrUsage) + 32
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case Script:
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sz += 20 // uint8 + 20 = size(attrUsage) + 20
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case DescriptionURL:
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sz += 1 + len(attr.Data)
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default:
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sz += util.GetVarSize(attr.Data)
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}
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return sz
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}
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// MarshalJSON implements the json Marschaller interface
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func (attr *Attribute) MarshalJSON() ([]byte, error) {
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return json.Marshal(map[string]string{
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"usage": attr.Usage.String(),
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"data": hex.EncodeToString(attr.Data),
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})
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}
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