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76 lines
1.5 KiB
76 lines
1.5 KiB
package utils
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import "encoding/hex"
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// FromHex returns the bytes represented by the hexadecimal string s.
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// s may be prefixed with "0x".
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func FromHex(s string) []byte {
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if len(s) > 1 {
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if s[0:2] == "0x" || s[0:2] == "0X" {
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s = s[2:]
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}
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}
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if len(s)%2 == 1 {
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s = "0" + s
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}
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return Hex2Bytes(s)
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}
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// CopyBytes returns an exact copy of the provided bytes.
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func CopyBytes(b []byte) (copiedBytes []byte) {
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if b == nil {
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return nil
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}
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copiedBytes = make([]byte, len(b))
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copy(copiedBytes, b)
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return
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}
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// isHexCharacter returns bool of c being a valid hexadecimal.
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func isHexCharacter(c byte) bool {
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return ('0' <= c && c <= '9') || ('a' <= c && c <= 'f') || ('A' <= c && c <= 'F')
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}
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// isHex validates whether each byte is valid hexadecimal string.
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func isHex(str string) bool {
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if len(str)%2 != 0 {
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return false
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}
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for _, c := range []byte(str) {
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if !isHexCharacter(c) {
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return false
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}
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}
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return true
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}
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// Hex2Bytes returns the bytes represented by the hexadecimal string str.
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func Hex2Bytes(str string) []byte {
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h, _ := hex.DecodeString(str)
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return h
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}
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// RightPadBytes zero-pads slice to the right up to length l.
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func RightPadBytes(slice []byte, l int) []byte {
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if l <= len(slice) {
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return slice
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}
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padded := make([]byte, l)
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copy(padded, slice)
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return padded
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}
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// LeftPadBytes zero-pads slice to the left up to length l.
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func LeftPadBytes(slice []byte, l int) []byte {
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if l <= len(slice) {
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return slice
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}
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padded := make([]byte, l)
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copy(padded[l-len(slice):], slice)
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return padded
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}
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