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authorobscuren <geffobscura@gmail.com>2014-10-15 23:12:26 +0800
committerobscuren <geffobscura@gmail.com>2014-10-15 23:12:26 +0800
commit311c6f8a3fed5ac03ee4b442fd0f420072bc41b4 (patch)
treede823080f3704d7690fd7172c9742962b66baf3a /ethutil
parent266d21209478bdb8c89e1ffb95d7f0de34635968 (diff)
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Fixed remote Arithmetic tests
Diffstat (limited to 'ethutil')
-rw-r--r--ethutil/big.go29
1 files changed, 20 insertions, 9 deletions
diff --git a/ethutil/big.go b/ethutil/big.go
index e23d8f659..bdcf86421 100644
--- a/ethutil/big.go
+++ b/ethutil/big.go
@@ -1,8 +1,8 @@
package ethutil
-import (
- "math/big"
-)
+import "math/big"
+
+var MaxInt256 *big.Int = BigD(Hex2Bytes("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"))
// Big pow
//
@@ -37,18 +37,29 @@ func BigD(data []byte) *big.Int {
// To256
//
// "cast" the big int to a 256 big int (i.e., limit to)
-var tt256 = new(big.Int).Sub(new(big.Int).Lsh(big.NewInt(1), 256), big.NewInt(1))
+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 To256(x *big.Int) *big.Int {
- x.And(x, tt256)
+func U256(x *big.Int) *big.Int {
+ //if x.Cmp(Big0) < 0 {
+ // return new(big.Int).Add(tt256, x)
+ // }
- if x.Cmp(new(big.Int)) < 0 {
- x.SetInt64(0)
- }
+ 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)
+ }
+}
+
// Big to bytes
//
// Returns the bytes of a big integer with the size specified by **base**