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common: add UnprefixedHash, UnprefixedAddress

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This commit is contained in:
Felix Lange 2017-03-02 14:03:20 +01:00
parent b4547a560b
commit d42a56afc5
1 changed files with 30 additions and 14 deletions
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44
common/types.go
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@ -17,6 +17,7 @@
package common
import (
"encoding/hex"
"fmt"
"math/big"
"math/rand"
@ -30,13 +31,8 @@ const (
AddressLength = 20
)
type (
// Hash represents the 32 byte Keccak256 hash of arbitrary data.
Hash [HashLength]byte
// Address represents the 20 byte address of an Ethereum account.
Address [AddressLength]byte
)
// Hash represents the 32 byte Keccak256 hash of arbitrary data.
type Hash [HashLength]byte
func BytesToHash(b []byte) Hash {
var h Hash
@ -113,7 +109,24 @@ func EmptyHash(h Hash) bool {
return h == Hash{}
}
// UnprefixedHash allows marshaling a Hash without 0x prefix.
type UnprefixedHash Hash
// UnmarshalText decodes the hash from hex. The 0x prefix is optional.
func (h *UnprefixedHash) UnmarshalText(input []byte) error {
return hexutil.UnmarshalFixedUnprefixedText("UnprefixedHash", input, h[:])
}
// MarshalText encodes the hash as hex.
func (h UnprefixedHash) MarshalText() ([]byte, error) {
return []byte(hex.EncodeToString(h[:])), nil
}
/////////// Address
// Address represents the 20 byte address of an Ethereum account.
type Address [AddressLength]byte
func BytesToAddress(b []byte) Address {
var a Address
a.SetBytes(b)
@ -181,12 +194,15 @@ func (a *Address) UnmarshalText(input []byte) error {
return hexutil.UnmarshalFixedText("Address", input, a[:])
}
// PP Pretty Prints a byte slice in the following format:
// hex(value[:4])...(hex[len(value)-4:])
func PP(value []byte) string {
if len(value) <= 8 {
return Bytes2Hex(value)
}
// UnprefixedHash allows marshaling an Address without 0x prefix.
type UnprefixedAddress Address
return fmt.Sprintf("%x...%x", value[:4], value[len(value)-4])
// UnmarshalText decodes the address from hex. The 0x prefix is optional.
func (a *UnprefixedAddress) UnmarshalText(input []byte) error {
return hexutil.UnmarshalFixedUnprefixedText("UnprefixedAddress", input, a[:])
}
// MarshalText encodes the address as hex.
func (a UnprefixedAddress) MarshalText() ([]byte, error) {
return []byte(hex.EncodeToString(a[:])), nil
}