SwapEndian.h

//
// Copyright (c) 2014-present, Facebook, Inc.
// All rights reserved.
//
// This source code is licensed under the University of Illinois/NCSA Open
// Source License found in the LICENSE file in the root directory of this
// source tree. An additional grant of patent rights can be found in the
// PATENTS file in the same directory.
//
 
#pragma once
 
#include <cstdint>
 
namespace ds2 {
 
static constexpr uint16_t Swap16(uint16_t x) { return (x >> 8) | (x << 8); }
 
static constexpr uint32_t Swap32(uint32_t x) {
  return Swap16(x >> 16) | (Swap16(x & 0xffff) << 16);
}
 
static constexpr uint64_t Swap64(uint64_t x) {
  return Swap32(x >> 32) |
         (static_cast<uint64_t>(Swap32(x & 0xffffffff)) << 32);
}
} // namespace ds2