Added Bytes64 (#1115)

common/bytes64.go

@@ -0,0 +1,97 @@
+package common
+
+import (
+	"bytes"
+	"database/sql/driver"
+	"encoding/hex"
+	"fmt"
+	"reflect"
+
+	"github.com/ledgerwatch/erigon-lib/common/hexutility"
+	"github.com/ledgerwatch/erigon-lib/common/length"
+)
+
+var (
+	bytes64T = reflect.TypeOf(Bytes64{})
+)
+
+type Bytes64 [length.Bytes64]byte
+
+// Hex converts a hash to a hex string.
+func (b Bytes64) Hex() string { return hexutility.Encode(b[:]) }
+
+// UnmarshalJSON parses a hash in hex syntax.
+func (b *Bytes64) UnmarshalJSON(input []byte) error {
+	return hexutility.UnmarshalFixedJSON(bytes64T, input, b[:])
+}
+
+// UnmarshalText parses a hash in hex syntax.
+func (b *Bytes64) UnmarshalText(input []byte) error {
+	return hexutility.UnmarshalFixedText("Bytes64", input, b[:])
+}
+
+// MarshalText returns the hex representation of a.
+func (b Bytes64) MarshalText() ([]byte, error) {
+	bl := b[:]
+	result := make([]byte, len(b)*2+2)
+	copy(result, hexPrefix)
+	hex.Encode(result[2:], bl)
+	return result, nil
+}
+
+// Format implements fmt.Formatter.
+// Hash supports the %v, %s, %v, %x, %X and %d format verbs.
+func (b Bytes64) Format(s fmt.State, c rune) {
+	hexb := make([]byte, 2+len(b)*2)
+	copy(hexb, "0x")
+	hex.Encode(hexb[2:], b[:])
+
+	switch c {
+	case 'x', 'X':
+		if !s.Flag('#') {
+			hexb = hexb[2:]
+		}
+		if c == 'X' {
+			hexb = bytes.ToUpper(hexb)
+		}
+		fallthrough
+	case 'v', 's':
+		s.Write(hexb)
+	case 'q':
+		q := []byte{'"'}
+		s.Write(q)
+		s.Write(hexb)
+		s.Write(q)
+	case 'd':
+		fmt.Fprint(s, ([len(b)]byte)(b))
+	default:
+		fmt.Fprintf(s, "%%!%c(hash=%x)", c, b)
+	}
+}
+
+// String implements the stringer interface and is used also by the logger when
+// doing full logging into a file.
+func (b Bytes64) String() string {
+	return b.Hex()
+}
+
+// SetBytes sets the hash to the value of i.
+// If b is larger than len(h), b will be cropped from the left.
+func (b *Bytes64) SetBytes(i []byte) {
+	if len(i) > len(b) {
+		i = i[len(i)-length.Hash:]
+	}
+
+	copy(b[length.Hash-len(i):], i)
+}
+
+// Value implements valuer for database/sql.
+func (b Bytes64) Value() (driver.Value, error) {
+	return b[:], nil
+}
+
+// TerminalString implements log.TerminalStringer, formatting a string for console
+// output during logging.
+func (b Bytes64) TerminalString() string {
+	return fmt.Sprintf("%x…%x", b[:3], b[len(b)-3:])
+}

common/length/length.go

@@ -25,6 +25,8 @@ const (
 	Bytes96 = 96
 	// expected length of Bytes48 (bls public key and such)
 	Bytes48 = 48
+	// expected length of Bytes64 (sync committee bits)
+	Bytes64 = 64
 	// expected length of Bytes48 (beacon domain and such)
 	Bytes4 = 4
 	// Addr is the expected length of the address (in bytes)