new type + additional methods

common/types.go

@@ -4,3 +4,39 @@ type (
 	Hash    [32]byte
 	Address [20]byte
 )
+
+// Don't use the default 'String' method in case we want to overwrite
+
+// Get the string representation of the underlying hash
+func (h Hash) Str() string {
+	return string(h[:])
+}
+
+// Sets the hash to the value of b. If b is larger than len(h) it will panic
+func (h Hash) SetBytes(b []byte) {
+	if len(b) > len(h) {
+		panic("unable to set bytes. too big")
+	}
+
+	// reverse loop
+	for i := len(b); i >= 0; i-- {
+		h[i] = b[i]
+	}
+}
+
+// Get the string representation of the underlying address
+func (a Address) Str() string {
+	return string(a[:])
+}
+
+// Sets the address to the value of b. If b is larger than len(a) it will panic
+func (h Address) SetBytes(b []byte) {
+	if len(b) > len(h) {
+		panic("unable to set bytes. too big")
+	}
+
+	// reverse loop
+	for i := len(b); i >= 0; i-- {
+		h[i] = b[i]
+	}
+}