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params_builder.go
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/
params_builder.go
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/*
* Copyright (C) 2018 The ontology Authors
* This file is part of The ontology library.
*
* The ontology is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The ontology is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with The ontology. If not, see <http://www.gnu.org/licenses/>.
*/
package neovm
import (
"bytes"
"encoding/binary"
"math/big"
"OntologyWithPOC/common"
)
type ParamsBuilder struct {
buffer *bytes.Buffer
}
func NewParamsBuilder(buffer *bytes.Buffer) *ParamsBuilder {
return &ParamsBuilder{buffer}
}
func (p *ParamsBuilder) Emit(op OpCode) {
p.buffer.WriteByte(byte(op))
}
func (p *ParamsBuilder) EmitPushBool(data bool) {
if data {
p.Emit(PUSHT)
return
}
p.Emit(PUSHF)
}
func (p *ParamsBuilder) EmitPushInteger(data *big.Int) {
if data.Int64() == -1 {
p.Emit(PUSHM1)
return
}
if data.Int64() == 0 {
p.Emit(PUSH0)
return
}
if data.Int64() > 0 && data.Int64() < 16 {
p.Emit(OpCode((int(PUSH1) - 1 + int(data.Int64()))))
return
}
bytes := common.BigIntToNeoBytes(data)
p.EmitPushByteArray(bytes)
}
func (p *ParamsBuilder) EmitPushByteArray(data []byte) {
l := len(data)
if l < int(PUSHBYTES75) {
p.buffer.WriteByte(byte(l))
} else if l < 0x100 {
p.Emit(PUSHDATA1)
p.buffer.WriteByte(byte(l))
} else if l < 0x10000 {
p.Emit(PUSHDATA2)
b := make([]byte, 2)
binary.LittleEndian.PutUint16(b, uint16(l))
p.buffer.Write(b)
} else {
p.Emit(PUSHDATA4)
b := make([]byte, 4)
binary.LittleEndian.PutUint32(b, uint32(l))
p.buffer.Write(b)
}
p.buffer.Write(data)
}
func (p *ParamsBuilder) EmitPushCall(address []byte) {
p.Emit(APPCALL)
p.buffer.Write(address)
}
func (p *ParamsBuilder) ToArray() []byte {
return p.buffer.Bytes()
}