go-pulse/ethutil/big.go
2014-04-27 16:53:35 +02:00

61 lines
1.0 KiB
Go

package ethutil
import (
"math/big"
)
var BigInt0 *big.Int = big.NewInt(0)
// True
var BigTrue *big.Int = big.NewInt(1)
// False
var BigFalse *big.Int = big.NewInt(0)
// Returns the power of two integers
func BigPow(a, b int) *big.Int {
c := new(big.Int)
c.Exp(big.NewInt(int64(a)), big.NewInt(int64(b)), big.NewInt(0))
return c
}
// Like big.NewInt(uint64); this takes a string instead.
func Big(num string) *big.Int {
n := new(big.Int)
n.SetString(num, 0)
return n
}
// Like big.NewInt(uint64); this takes a byte buffer instead.
func BigD(data []byte) *big.Int {
n := new(big.Int)
n.SetBytes(data)
return n
}
func BigToBytes(num *big.Int, base int) []byte {
ret := make([]byte, base/8)
return append(ret[:len(ret)-len(num.Bytes())], num.Bytes()...)
}
// Functions like the build in "copy" function
// but works on big integers
func BigCopy(src *big.Int) (ret *big.Int) {
ret = new(big.Int)
ret.Add(ret, src)
return
}
func BigMax(x, y *big.Int) *big.Int {
if x.Cmp(y) <= 0 {
return x
}
return y
}