81 lines
1.9 KiB
Go
81 lines
1.9 KiB
Go
// Code extracted from vendor/github.com/ethereum/go-ethereum/common/types.go
|
|
|
|
package statusproto
|
|
|
|
import (
|
|
"encoding/hex"
|
|
)
|
|
|
|
const (
|
|
// HashLength is the expected length of the hash
|
|
HashLength = 32
|
|
)
|
|
|
|
// Hash represents the 32 byte Keccak256 hash of arbitrary data.
|
|
type Hash [HashLength]byte
|
|
|
|
// Encode encodes b as a hex string with 0x prefix.
|
|
func encode(b []byte) string {
|
|
enc := make([]byte, len(b)*2+2)
|
|
copy(enc, "0x")
|
|
hex.Encode(enc[2:], b)
|
|
return string(enc)
|
|
}
|
|
|
|
// 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')
|
|
}
|
|
|
|
// Hex2Bytes returns the bytes represented by the hexadecimal string str.
|
|
func Hex2Bytes(str string) []byte {
|
|
h, _ := hex.DecodeString(str)
|
|
return h
|
|
}
|
|
|
|
// FromHex returns the bytes represented by the hexadecimal string s.
|
|
// s may be prefixed with "0x".
|
|
func FromHex(s string) []byte {
|
|
if has0xPrefix(s) {
|
|
s = s[2:]
|
|
}
|
|
if len(s)%2 == 1 {
|
|
s = "0" + s
|
|
}
|
|
return Hex2Bytes(s)
|
|
}
|
|
|
|
// HexToHash sets byte representation of s to hash.
|
|
// If b is larger than len(h), b will be cropped from the left.
|
|
func HexToHash(s string) Hash { return BytesToHash(FromHex(s)) }
|
|
|
|
// Hex converts a hash to a hex string.
|
|
func (h *Hash) Hex() string { return encode(h[:]) }
|
|
|
|
// Bytes gets the byte representation of the underlying hash.
|
|
func (h Hash) Bytes() []byte { return h[:] }
|
|
|
|
// String implements the stringer interface and is used also by the logger when
|
|
// doing full logging into a file.
|
|
func (h *Hash) String() string {
|
|
return h.Hex()
|
|
}
|
|
|
|
// SetBytes sets the hash to the value of b.
|
|
// If b is larger than len(h), b will be cropped from the left.
|
|
func (h *Hash) SetBytes(b []byte) {
|
|
if len(b) > len(h) {
|
|
b = b[len(b)-HashLength:]
|
|
}
|
|
|
|
copy(h[HashLength-len(b):], b)
|
|
}
|
|
|
|
// BytesToHash sets b to hash.
|
|
// If b is larger than len(h), b will be cropped from the left.
|
|
func BytesToHash(b []byte) Hash {
|
|
var h Hash
|
|
h.SetBytes(b)
|
|
return h
|
|
}
|