/
big.go
92 lines (79 loc) · 2.43 KB
/
big.go
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// Copyright (C) 2019 ZVChain
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package types
import (
"github.com/vmihailenco/msgpack"
"math/big"
)
// BigUint used as big.Int. Inheritance is for the implementation of Marshaler/Unmarshaler interface in msgpack framework
type BigInt struct {
big.Int
}
func NewBigInt(v uint64) *BigInt {
return &BigInt{Int: *new(big.Int).SetUint64(v)}
}
// ZeroBigInt indicate zero value
var ZeroBigInt = new(BigInt).SetInt64(0)
func (b *BigInt) Value() *big.Int {
return &b.Int
}
// UnmarshalMsgpack implements interface Unmarshaler
func (b *BigInt) UnmarshalMsgpack(bs []byte) error {
data := make([]byte, 0)
// Use msgpack to decode the bs first.
// You cannot directly decode the byte array using GobDecode function
err := msgpack.Unmarshal(bs, &data)
if err != nil {
return err
}
return b.GobDecode(data)
}
// MarshalMsgpack implements interface Marshaler
func (b *BigInt) MarshalMsgpack() ([]byte, error) {
bs, err := b.GobEncode()
if err != nil {
return nil, err
}
// Use msgpack to encode the byte array
// You cannot return the byte array directly returned from GobEncode function
return msgpack.Marshal(bs)
}
// IsNegative check if the number is negative
func (b *BigInt) IsNegative() bool {
return b.Sign() == -1
}
// GetBytesWithSign returns a byte array of the number with the first byte representing its sign.
// It must be success
func (b *BigInt) GetBytesWithSign() []byte {
if b == nil {
return []byte{}
}
bs, err := b.GobEncode()
if err != nil {
return []byte{}
}
return bs
}
// SetBytesWithSign set the given bytes with the first byte representing its sign to the BigInt.
// It must be success
func (b *BigInt) SetBytesWithSign(bs []byte) *BigInt {
if b == nil || len(bs) == 0 {
return nil
}
if err := b.GobDecode(bs); err != nil {
return nil
}
return b
}