mirror of https://github.com/status-im/op-geth.git
130 lines
3.2 KiB
Go
130 lines
3.2 KiB
Go
// Copyright 2014 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
// Package common contains various helper functions.
|
|
package common
|
|
|
|
import "encoding/hex"
|
|
|
|
// ToHex returns the hex representation of b, prefixed with '0x'.
|
|
// For empty slices, the return value is "0x0".
|
|
//
|
|
// Deprecated: use hexutil.Encode instead.
|
|
func ToHex(b []byte) string {
|
|
hex := Bytes2Hex(b)
|
|
if len(hex) == 0 {
|
|
hex = "0"
|
|
}
|
|
return "0x" + hex
|
|
}
|
|
|
|
// FromHex returns the bytes represented by the hexadecimal string s.
|
|
// s may be prefixed with "0x".
|
|
func FromHex(s string) []byte {
|
|
if len(s) > 1 {
|
|
if s[0:2] == "0x" || s[0:2] == "0X" {
|
|
s = s[2:]
|
|
}
|
|
}
|
|
if len(s)%2 == 1 {
|
|
s = "0" + s
|
|
}
|
|
return Hex2Bytes(s)
|
|
}
|
|
|
|
// CopyBytes returns an exact copy of the provided bytes.
|
|
func CopyBytes(b []byte) (copiedBytes []byte) {
|
|
if b == nil {
|
|
return nil
|
|
}
|
|
copiedBytes = make([]byte, len(b))
|
|
copy(copiedBytes, b)
|
|
|
|
return
|
|
}
|
|
|
|
// hasHexPrefix validates str begins with '0x' or '0X'.
|
|
func hasHexPrefix(str string) bool {
|
|
return len(str) >= 2 && str[0] == '0' && (str[1] == 'x' || str[1] == 'X')
|
|
}
|
|
|
|
// isHexCharacter returns bool of c being a valid hexadecimal.
|
|
func isHexCharacter(c byte) bool {
|
|
return ('0' <= c && c <= '9') || ('a' <= c && c <= 'f') || ('A' <= c && c <= 'F')
|
|
}
|
|
|
|
// isHex validates whether each byte is valid hexadecimal string.
|
|
func isHex(str string) bool {
|
|
if len(str)%2 != 0 {
|
|
return false
|
|
}
|
|
for _, c := range []byte(str) {
|
|
if !isHexCharacter(c) {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
// Bytes2Hex returns the hexadecimal encoding of d.
|
|
func Bytes2Hex(d []byte) string {
|
|
return hex.EncodeToString(d)
|
|
}
|
|
|
|
// Hex2Bytes returns the bytes represented by the hexadecimal string str.
|
|
func Hex2Bytes(str string) []byte {
|
|
h, _ := hex.DecodeString(str)
|
|
return h
|
|
}
|
|
|
|
// Hex2BytesFixed returns bytes of a specified fixed length flen.
|
|
func Hex2BytesFixed(str string, flen int) []byte {
|
|
h, _ := hex.DecodeString(str)
|
|
if len(h) == flen {
|
|
return h
|
|
}
|
|
if len(h) > flen {
|
|
return h[len(h)-flen:]
|
|
}
|
|
hh := make([]byte, flen)
|
|
copy(hh[flen-len(h):flen], h)
|
|
return hh
|
|
}
|
|
|
|
// RightPadBytes zero-pads slice to the right up to length l.
|
|
func RightPadBytes(slice []byte, l int) []byte {
|
|
if l <= len(slice) {
|
|
return slice
|
|
}
|
|
|
|
padded := make([]byte, l)
|
|
copy(padded, slice)
|
|
|
|
return padded
|
|
}
|
|
|
|
// LeftPadBytes zero-pads slice to the left up to length l.
|
|
func LeftPadBytes(slice []byte, l int) []byte {
|
|
if l <= len(slice) {
|
|
return slice
|
|
}
|
|
|
|
padded := make([]byte, l)
|
|
copy(padded[l-len(slice):], slice)
|
|
|
|
return padded
|
|
}
|