1 files changed, 27 insertions, 1 deletions
diff --git a/ethutil/bytes.go b/ethutil/bytes.go
index 40903a5f1..b298675a2 100644
--- a/ethutil/bytes.go
+++ b/ethutil/bytes.go
@@ -6,6 +6,9 @@ import (
 	"fmt"
 )
 
+// Number to bytes
+//
+// Returns the number in bytes with the specified base
 func NumberToBytes(num interface{}, bits int) []byte {
 	buf := new(bytes.Buffer)
 	err := binary.Write(buf, binary.BigEndian, num)
@@ -16,6 +19,9 @@ func NumberToBytes(num interface{}, bits int) []byte {
 	return buf.Bytes()[buf.Len()-(bits/8):]
 }
 
+// Bytes to number
+//
+// Attempts to cast a byte slice to a unsigned integer
 func BytesToNumber(b []byte) uint64 {
 	var number uint64
 
@@ -32,7 +38,9 @@ func BytesToNumber(b []byte) uint64 {
 	return number
 }
 
-// Read variable integer in big endian
+// Read variable int
+//
+// Read a variable length number in big endian byte order
 func ReadVarint(reader *bytes.Reader) (ret uint64) {
 	if reader.Len() == 8 {
 		var num uint64
@@ -55,6 +63,9 @@ func ReadVarint(reader *bytes.Reader) (ret uint64) {
 	return ret
 }
 
+// Binary length
+//
+// Returns the true binary length of the given number
 func BinaryLength(num int) int {
 	if num == 0 {
 		return 0
@@ -62,3 +73,18 @@ func BinaryLength(num int) int {
 
 	return 1 + BinaryLength(num>>8)
 }
+
+// Copy bytes
+//
+// Returns an exact copy of the provided bytes
+func CopyBytes(b []byte) (copiedBytes []byte) {
+	copiedBytes = make([]byte, len(b))
+	copy(copiedBytes, b)
+
+	return
+}
+
+func IsHex(str string) bool {
+	l := len(str)
+	return l >= 4 && l%2 == 0 && str[0:2] == "0x"
+}