The core protocol of WoopChain
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woop/internal/common/hash.go

135 lines
3.7 KiB

package common
import (
"database/sql/driver"
"encoding/hex"
"fmt"
"math/big"
"math/rand"
"reflect"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/woop-chain/woop/internal/utils"
)
// Lengths of hashes in bytes.
const (
// HashLength is the expected length of the hash
HashLength = 32
)
var (
hashT = reflect.TypeOf(Hash{})
addressT = reflect.TypeOf(Address{})
)
// Hash represents the 32 byte Keccak256 hash of arbitrary data.
type Hash [HashLength]byte
// 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
}
// BigToHash sets byte representation of b to hash.
// If b is larger than len(h), b will be cropped from the left.
func BigToHash(b *big.Int) Hash { return BytesToHash(b.Bytes()) }
// 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(utils.FromHex(s)) }
// Bytes gets the byte representation of the underlying hash.
func (h Hash) Bytes() []byte { return h[:] }
// Big converts a hash to a big integer.
func (h Hash) Big() *big.Int { return new(big.Int).SetBytes(h[:]) }
// Hex converts a hash to a hex string.
func (h Hash) Hex() string { return hexutil.Encode(h[:]) }
// TerminalString implements log.TerminalStringer, formatting a string for console
// output during logging.
func (h Hash) TerminalString() string {
return fmt.Sprintf("%x…%x", h[:3], h[29:])
}
// 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()
}
// Format implements fmt.Formatter, forcing the byte slice to be formatted as is,
// without going through the stringer interface used for logging.
func (h Hash) Format(s fmt.State, c rune) {
fmt.Fprintf(s, "%"+string(c), h[:])
}
// UnmarshalText parses a hash in hex syntax.
func (h *Hash) UnmarshalText(input []byte) error {
return hexutil.UnmarshalFixedText("Hash", input, h[:])
}
// UnmarshalJSON parses a hash in hex syntax.
func (h *Hash) UnmarshalJSON(input []byte) error {
return hexutil.UnmarshalFixedJSON(hashT, input, h[:])
}
// MarshalText returns the hex representation of h.
func (h Hash) MarshalText() ([]byte, error) {
return hexutil.Bytes(h[:]).MarshalText()
}
// 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)
}
// 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)
}
// Scan implements Scanner for database/sql.
func (h *Hash) Scan(src interface{}) error {
srcB, ok := src.([]byte)
if !ok {
return fmt.Errorf("can't scan %T into Hash", src)
}
if len(srcB) != HashLength {
return fmt.Errorf("can't scan []byte of len %d into Hash, want %d", len(srcB), HashLength)
}
copy(h[:], srcB)
return nil
}
// Value implements valuer for database/sql.
func (h Hash) Value() (driver.Value, error) {
return h[:], nil
}
// 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
}