go-ethereum/rlp/unsafe.go

// Copyright 2021 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

//go:build !nacl && !js && cgo
// +build !nacl,!js,cgo

package rlp

import (
	"reflect"
	"unsafe"
)

// byteArrayBytes returns a slice of the byte array v.
func byteArrayBytes(v reflect.Value, length int) []byte {
	var s []byte
	hdr := (*reflect.SliceHeader)(unsafe.Pointer(&s))
	hdr.Data = v.UnsafeAddr()
	hdr.Cap = length
	hdr.Len = length
	return s
}