diff options
Diffstat (limited to 'ethutil/big.go')
| -rw-r--r-- | ethutil/big.go | 31 |
1 files changed, 21 insertions, 10 deletions
diff --git a/ethutil/big.go b/ethutil/big.go index c0488a71f..891d476ad 100644 --- a/ethutil/big.go +++ b/ethutil/big.go @@ -12,7 +12,9 @@ var BigTrue *big.Int = big.NewInt(1) // False var BigFalse *big.Int = big.NewInt(0) -// Returns the power of two integers +// 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)) @@ -20,7 +22,9 @@ func BigPow(a, b int) *big.Int { return c } -// Like big.NewInt(uint64); this takes a string instead. +// Big +// +// Shortcut for new(big.Int).SetString(..., 0) func Big(num string) *big.Int { n := new(big.Int) n.SetString(num, 0) @@ -28,7 +32,9 @@ func Big(num string) *big.Int { return n } -// Like big.NewInt(uint64); this takes a byte buffer instead. +// BigD +// +// Shortcut for new(big.Int).SetBytes(...) func BigD(data []byte) *big.Int { n := new(big.Int) n.SetBytes(data) @@ -36,21 +42,26 @@ func BigD(data []byte) *big.Int { return n } +// 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) 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 +// 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 x |