+++ /dev/null
-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()) }
-func HexToHash(s string) Hash { return BytesToHash(FromHex(s)) }
-
-// 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) Big() *big.Int { return Bytes2Big(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)
-}
-
-// Set string `s` to h. If s is larger than len(h) it will panic
-func (h *Hash) SetString(s string) { h.SetBytes([]byte(s)) }
-
-// 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{}
-}