// Package common contains various helper functions. package common import ( "encoding/binary" "encoding/hex" ) func FromHex(s string) []byte { if len(s) > 1 { if s[0:2] == "0x" { s = s[2:] } if len(s)%2 == 1 { s = "0" + s } return Hex2Bytes(s) } return nil } func Bytes2Hex(d []byte) string { return hex.EncodeToString(d) } func Hex2Bytes(str string) []byte { h, _ := hex.DecodeString(str) return h } func Unit64ToBytes(n uint64) []byte { buf := make([]byte, 8) binary.LittleEndian.PutUint64(buf, n) return buf } func BytesToUnit64(b []byte) uint64 { return binary.LittleEndian.Uint64(b) }