init: v1.0.0

gmath/fillbytes_go114.go

@@ -0,0 +1,20 @@
+//go:build !go1.15
+// +build !go1.15
+
+package gmath
+
+import (
+	"math/big"
+)
+
+// FillBytes fill the buf with the abs of a in big-endian with zero extention.
+// if buf is two short, then return error, while Big.Int's FillBytes panic
+func FillBytes(a *big.Int, buf []byte) error {
+	if (a.BitLen()+7)/8 > len(buf) {
+		return ErrBufTooShort
+	}
+
+	b := ToNBytes(a, len(buf))
+	copy(buf, b)
+	return nil
+}