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types.go
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/
types.go
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package common
import (
_ "encoding/hex"
"encoding/json"
"errors"
"math/big"
"math/rand"
"reflect"
"strings"
)
const (
HashLength = 32
AddressLength = 42
PubkeyHashLength = 20
)
var hashJsonLengthErr = errors.New("common: unmarshalJSON failed: hash must be exactly 32 bytes")
type (
Hash [HashLength]byte
)
func BytesToHash(b []byte) Hash {
var h Hash
h.SetBytes(b)
return h
}
func StringToHash(s string) Hash { return BytesToHash([]byte(s)) }
func BigToHash(b *big.Int) Hash { return BytesToHash(b.Bytes()) }
// Don't use the default 'String' method in case we want to overwrite
// Get the string representation of the underlying hash
func (h Hash) Str() string { return string(h[:]) }
func (h Hash) Bytes() []byte { return h[:] }
func (h Hash) Hex() string { return "0x" + Bytes2Hex(h[:]) }
// UnmarshalJSON parses a hash in its hex from to a hash.
func (h *Hash) UnmarshalJSON(input []byte) error {
length := len(input)
if length >= 2 && input[0] == '"' && input[length-1] == '"' {
input = input[1 : length-1]
}
// strip "0x" for length check
if len(input) > 1 && strings.ToLower(string(input[:2])) == "0x" {
input = input[2:]
}
// validate the length of the input hash
if len(input) != HashLength*2 {
return hashJsonLengthErr
}
h.SetBytes(FromHex(string(input)))
return nil
}
// Serialize given hash to JSON
func (h Hash) MarshalJSON() ([]byte, error) {
return json.Marshal(h.Hex())
}
// Sets the hash to the value of b. If b is larger than len(h) it will panic
func (h *Hash) SetBytes(b []byte) {
if len(b) > len(h) {
b = b[len(b)-HashLength:]
}
copy(h[HashLength-len(b):], b)
}
// Sets h to other
func (h *Hash) Set(other Hash) {
for i, v := range other {
h[i] = v
}
}
// Generate implements testing/quick.Generator.
func (h Hash) Generate(rand *rand.Rand, size int) reflect.Value {
m := rand.Intn(len(h))
for i := len(h) - 1; i > m; i-- {
h[i] = byte(rand.Uint32())
}
return reflect.ValueOf(h)
}
func EmptyHash(h Hash) bool {
return h == Hash{}
}