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// Copyright 2014 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library 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 go-ethereum library 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 go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package common
import (
"database/sql/driver"
"fmt"
"math/big"
)
// Common big integers often used
var (
Big1 = big.NewInt(1)
Big2 = big.NewInt(2)
Big3 = big.NewInt(3)
Big0 = big.NewInt(0)
Big32 = big.NewInt(32)
Big256 = big.NewInt(256)
Big257 = big.NewInt(257)
)
// Big support database/sql Scan and Value.
type Big big.Int
// Scan implements Scanner for database/sql.
func (b *Big) Scan(src interface{}) error {
newB := new(big.Int)
switch t := src.(type) {
case int64:
*b = Big(*newB.SetInt64(t))
case uint64:
*b = Big(*newB.SetUint64(t))
case []byte:
err := newB.UnmarshalText(t)
if err != nil {
return err
}
*b = Big(*newB)
case string:
v, ok := newB.SetString(t, 10)
if !ok {
return fmt.Errorf("invalid string format %v", src)
}
*b = Big(*v)
default:
return fmt.Errorf("can't scan %T into Big", src)
}
return nil
}
// Value implements valuer for database/sql.
func (b Big) Value() (driver.Value, error) {
b2 := big.Int(b)
return (&b2).String(), nil
}
// String returns decimal value in string type.
func (b *Big) String() string { return (*big.Int)(b).String() }
// BigInt convert common.Big to big.Int.
func (b *Big) BigInt() *big.Int { return (*big.Int)(b) }
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