diff options
Diffstat (limited to 'ethutil/big.go')
-rw-r--r-- | ethutil/big.go | 123 |
1 files changed, 0 insertions, 123 deletions
diff --git a/ethutil/big.go b/ethutil/big.go deleted file mode 100644 index b77e0af8c..000000000 --- a/ethutil/big.go +++ /dev/null @@ -1,123 +0,0 @@ -package ethutil - -import "math/big" - -// Big pow -// -// Returns the power of two big 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 -} - -// Big -// -// Shortcut for new(big.Int).SetString(..., 0) -func Big(num string) *big.Int { - n := new(big.Int) - n.SetString(num, 0) - - return n -} - -// BigD -// -// Shortcut for new(big.Int).SetBytes(...) -func Bytes2Big(data []byte) *big.Int { - n := new(big.Int) - n.SetBytes(data) - - return n -} -func BigD(data []byte) *big.Int { return Bytes2Big(data) } - -func String2Big(num string) *big.Int { - n := new(big.Int) - n.SetString(num, 0) - return n -} - -func BitTest(num *big.Int, i int) bool { - return num.Bit(i) > 0 -} - -// To256 -// -// "cast" the big int to a 256 big int (i.e., limit to) -var tt256 = new(big.Int).Lsh(big.NewInt(1), 256) -var tt256m1 = new(big.Int).Sub(new(big.Int).Lsh(big.NewInt(1), 256), big.NewInt(1)) -var tt255 = new(big.Int).Lsh(big.NewInt(1), 255) - -func U256(x *big.Int) *big.Int { - //if x.Cmp(Big0) < 0 { - // return new(big.Int).Add(tt256, x) - // } - - x.And(x, tt256m1) - - return x -} - -func S256(x *big.Int) *big.Int { - if x.Cmp(tt255) < 0 { - return x - } else { - // We don't want to modify x, ever - return new(big.Int).Sub(x, tt256) - } -} - -func FirstBitSet(v *big.Int) int { - for i := 0; i < v.BitLen(); i++ { - if v.Bit(i) > 0 { - return i - } - } - - return v.BitLen() -} - -// Big to bytes -// -// Returns the bytes of a big integer with the size specified by **base** -// Attempts to pad the byte array with zeros. -func BigToBytes(num *big.Int, base int) []byte { - ret := make([]byte, base/8) - - if len(num.Bytes()) > base/8 { - return num.Bytes() - } - - return append(ret[:len(ret)-len(num.Bytes())], num.Bytes()...) -} - -// Big copy -// -// Creates a copy of the given big integer -func BigCopy(src *big.Int) *big.Int { - return new(big.Int).Set(src) -} - -// Big max -// -// Returns the maximum size big integer -func BigMax(x, y *big.Int) *big.Int { - if x.Cmp(y) <= 0 { - return y - } - - return x -} - -// Big min -// -// Returns the minimum size big integer -func BigMin(x, y *big.Int) *big.Int { - if x.Cmp(y) >= 0 { - return y - } - - return x -} |