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Merge 81c76e07dc into c72f5459ac

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Joubin Houshyar 2016-10-20 08:59:50 +00:00 committed by GitHub
commit 6366c4a1b8
1 changed files with 10 additions and 5 deletions
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15
common/big.go
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@ -116,14 +116,19 @@ func FirstBitSet(v *big.Int) int {
// //
// Returns the bytes of a big integer with the size specified by **base** // Returns the bytes of a big integer with the size specified by **base**
// Attempts to pad the byte array with zeros. // Attempts to pad the byte array with zeros.
//
// Note that input arg **num** is expected to be non-nil;
// nil argument will result in runtime panic.
func BigToBytes(num *big.Int, base int) []byte { func BigToBytes(num *big.Int, base int) []byte {
ret := make([]byte, base/8) bytes := num.Bytes()
blen := len(bytes)
bpb := base / 8
if len(num.Bytes()) > base/8 { if blen > bpb {
return num.Bytes() return bytes
} }
padBuf := make([]byte, bpb)
return append(ret[:len(ret)-len(num.Bytes())], num.Bytes()...) return append(padBuf[:bpb-blen], bytes...)
} }
// Big copy // Big copy