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57 lines
1.5 KiB
Go
57 lines
1.5 KiB
Go
package nef
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import (
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"errors"
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"strings"
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"github.com/nspcc-dev/neo-go/pkg/io"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract/callflag"
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"github.com/nspcc-dev/neo-go/pkg/util"
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)
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// maxMethodLength is the maximum length of method.
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const maxMethodLength = 32
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var (
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errInvalidMethodName = errors.New("method name should't start with '_'")
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errInvalidCallFlag = errors.New("invalid call flag")
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)
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// MethodToken is contract method description.
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type MethodToken struct {
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// Hash is contract hash.
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Hash util.Uint160 `json:"hash"`
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// Method is method name.
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Method string `json:"method"`
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// ParamCount is method parameter count.
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ParamCount uint16 `json:"paramcount"`
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// HasReturn is true if method returns value.
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HasReturn bool `json:"hasreturnvalue"`
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// CallFlag is a set of call flags the method will be called with.
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CallFlag callflag.CallFlag `json:"callflags"`
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}
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// EncodeBinary implements io.Serializable.
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func (t *MethodToken) EncodeBinary(w *io.BinWriter) {
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w.WriteBytes(t.Hash[:])
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w.WriteString(t.Method)
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w.WriteU16LE(t.ParamCount)
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w.WriteBool(t.HasReturn)
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w.WriteB(byte(t.CallFlag))
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}
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// DecodeBinary implements io.Serializable.
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func (t *MethodToken) DecodeBinary(r *io.BinReader) {
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r.ReadBytes(t.Hash[:])
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t.Method = r.ReadString(maxMethodLength)
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if r.Err == nil && strings.HasPrefix(t.Method, "_") {
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r.Err = errInvalidMethodName
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return
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}
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t.ParamCount = r.ReadU16LE()
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t.HasReturn = r.ReadBool()
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t.CallFlag = callflag.CallFlag(r.ReadB())
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if r.Err == nil && t.CallFlag&^callflag.All != 0 {
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r.Err = errInvalidCallFlag
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}
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}
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