87 lines
1.7 KiB
Go
87 lines
1.7 KiB
Go
package pilorama
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import "github.com/nspcc-dev/neo-go/pkg/io"
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func (x *Meta) FromBytes(data []byte) error {
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if len(data) == 0 {
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x.Items = nil
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x.Time = 0
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return nil
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}
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r := io.NewBinReaderFromBuf(data)
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x.DecodeBinary(r)
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return r.Err
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}
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func (x Meta) Bytes() []byte {
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w := io.NewBufBinWriter()
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x.EncodeBinary(w.BinWriter)
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return w.Bytes()
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}
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func (x Meta) GetAttr(name string) []byte {
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for _, kv := range x.Items {
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if kv.Key == name {
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return kv.Value
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}
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}
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return nil
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}
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// DecodeBinary implements the io.Serializable interface.
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func (x *Meta) DecodeBinary(r *io.BinReader) {
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ts := r.ReadVarUint()
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size := r.ReadVarUint()
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m := make([]KeyValue, size)
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for i := range m {
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m[i].Key = r.ReadString()
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m[i].Value = r.ReadVarBytes()
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}
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if r.Err != nil {
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return
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}
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x.Time = ts
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x.Items = m
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}
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// EncodeBinary implements the io.Serializable interface.
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func (x Meta) EncodeBinary(w *io.BinWriter) {
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w.WriteVarUint(x.Time)
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w.WriteVarUint(uint64(len(x.Items)))
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for _, e := range x.Items {
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w.WriteString(e.Key)
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w.WriteVarBytes(e.Value)
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}
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}
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// Size returns size of x in bytes.
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func (x Meta) Size() int {
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size := getVarIntSize(x.Time)
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size += getVarIntSize(uint64(len(x.Items)))
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for i := range x.Items {
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ln := len(x.Items[i].Key)
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size += getVarIntSize(uint64(ln)) + ln
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ln = len(x.Items[i].Value)
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size += getVarIntSize(uint64(ln)) + ln
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}
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return size
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}
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// getVarIntSize returns the size in number of bytes of a variable integer.
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// (reference: GetVarSize(int value), https://github.com/neo-project/neo/blob/master/neo/IO/Helper.cs)
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func getVarIntSize(value uint64) int {
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var size int
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if value < 0xFD {
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size = 1 // unit8
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} else if value <= 0xFFFF {
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size = 3 // byte + uint16
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} else {
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size = 5 // byte + uint32
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}
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return size
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}
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