ethutil/big.go


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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
}