63 lines
1.6 KiB
Go
63 lines
1.6 KiB
Go
package transaction
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import (
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"errors"
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"github.com/CityOfZion/neo-go/pkg/wire/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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var errMaxData = errors.New("max Size of Attribute reached")
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const maxAttrSize = 65535
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// Encode encodes the given Attribute into the binary writer
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func (a *Attribute) Encode(bw *util.BinWriter) {
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if len(a.Data) > maxAttrSize {
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bw.Err = errMaxData
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return
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}
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bw.Write(uint8(a.Usage))
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if a.Usage == DescriptionURL || a.Usage == Vote || (a.Usage >= Hash1 && a.Usage <= Hash15) {
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bw.Write(a.Data[:32])
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} else if a.Usage == Script {
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bw.Write(a.Data[:20])
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} else if a.Usage == ECDH02 || a.Usage == ECDH03 {
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bw.Write(a.Data[1:33])
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} else if a.Usage == CertURL || a.Usage == DescriptionURL || a.Usage == Description || a.Usage >= Remark {
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bw.VarUint(uint64(len(a.Data)))
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bw.Write(a.Data)
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} else {
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bw.Write(a.Data)
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}
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}
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// Decode decodes the binary reader into an Attribute object
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func (a *Attribute) Decode(br *util.BinReader) {
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br.Read(&a.Usage)
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if a.Usage == DescriptionURL || a.Usage == Vote || a.Usage >= Hash1 && a.Usage <= Hash15 {
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a.Data = make([]byte, 32)
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br.Read(&a.Data)
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} else if a.Usage == Script {
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a.Data = make([]byte, 20)
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br.Read(&a.Data)
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} else if a.Usage == ECDH02 || a.Usage == ECDH03 {
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a.Data = make([]byte, 32)
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br.Read(&a.Data)
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} else if a.Usage == CertURL || a.Usage == DescriptionURL || a.Usage == Description || a.Usage >= Remark {
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lenData := br.VarUint()
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a.Data = make([]byte, lenData)
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br.Read(&a.Data)
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} else {
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br.Read(&a.Data)
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}
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}
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