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common: unify hex prefix check code #19937

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merged 4 commits into from
Aug 22, 2019
Merged

common: unify hex prefix check code #19937

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0c05e37
unifying hex prefix check
lmittmann Aug 11, 2019
d925816
Revert "unifying hex prefix check"
lmittmann Aug 15, 2019
5b28348
use hasHexPrefix for 0x prefix check
lmittmann Aug 15, 2019
873bc94
renamed hasHexPrefix -> has0xPrefix
lmittmann Aug 15, 2019
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10 changes: 4 additions & 6 deletions common/bytes.go
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Original file line number Diff line number Diff line change
Expand Up @@ -43,10 +43,8 @@ func ToHexArray(b [][]byte) []string {
// 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 has0xPrefix(s) {
s = s[2:]
}
if len(s)%2 == 1 {
s = "0" + s
Expand All @@ -65,8 +63,8 @@ func CopyBytes(b []byte) (copiedBytes []byte) {
return
}

// hasHexPrefix validates str begins with '0x' or '0X'.
func hasHexPrefix(str string) bool {
// has0xPrefix validates str begins with '0x' or '0X'.
func has0xPrefix(str string) bool {
return len(str) >= 2 && str[0] == '0' && (str[1] == 'x' || str[1] == 'X')
}

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2 changes: 1 addition & 1 deletion common/types.go
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Original file line number Diff line number Diff line change
Expand Up @@ -193,7 +193,7 @@ func HexToAddress(s string) Address { return BytesToAddress(FromHex(s)) }
// IsHexAddress verifies whether a string can represent a valid hex-encoded
// Ethereum address or not.
func IsHexAddress(s string) bool {
if hasHexPrefix(s) {
if has0xPrefix(s) {
s = s[2:]
}
return len(s) == 2*AddressLength && isHex(s)
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