path: root/ethutil/common.go

package ethutil

import (
    "fmt"
    "math/big"
)

// The different number of units
var (
    Ether   = BigPow(10, 18)
    Finney  = BigPow(10, 15)
    Szabo   = BigPow(10, 12)
    Shannon = BigPow(10, 9)
    Babbage = BigPow(10, 6)
    Ada     = BigPow(10, 3)
    Wei     = big.NewInt(1)
)

// Currency to string
//
// Returns a string representing a human readable format
func CurrencyToString(num *big.Int) string {
    switch {
    case num.Cmp(Ether) >= 0:
        return fmt.Sprintf("%v Ether", new(big.Int).Div(num, Ether))
    case num.Cmp(Finney) >= 0:
        return fmt.Sprintf("%v Finney", new(big.Int).Div(num, Finney))
    case num.Cmp(Szabo) >= 0:
        return fmt.Sprintf("%v Szabo", new(big.Int).Div(num, Szabo))
    case num.Cmp(Shannon) >= 0:
        return fmt.Sprintf("%v Shannon", new(big.Int).Div(num, Shannon))
    case num.Cmp(Babbage) >= 0:
        return fmt.Sprintf("%v Babbage", new(big.Int).Div(num, Babbage))
    case num.Cmp(Ada) >= 0:
        return fmt.Sprintf("%v Ada", new(big.Int).Div(num, Ada))
    }

    return fmt.Sprintf("%v Wei", num)
}

// Common big integers often used
var (
    Big1   = big.NewInt(1)
    Big2   = big.NewInt(1)
    Big0   = big.NewInt(0)
    Big32  = big.NewInt(32)
    Big256 = big.NewInt(0xff)
)

// Creates an ethereum address given the bytes and the nonce
func CreateAddress(b []byte, nonce *big.Int) []byte {
    addrBytes := append(b, nonce.Bytes()...)

    return Sha3Bin(addrBytes)[12:]
}