// Protocol Buffers - Google's data interchange format

// Copyright 2008 Google Inc.  All rights reserved.

//

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file or at

// https://developers.google.com/open-source/licenses/bsd

#ifndef GOOGLE_PROTOBUF_ENDIAN_H__

#define GOOGLE_PROTOBUF_ENDIAN_H__

#if defined(_MSC_VER)

#include <stdlib.h>

#endif

#include <cstdint>

#include "absl/base/config.h"

// Must be included last.

#include "google/protobuf/port_def.inc"

namespace google {

namespace protobuf {

namespace internal {

inline uint64_t BSwap64(uint64_t host_int) {

#if defined(__GNUC__) || ABSL_HAVE_BUILTIN(__builtin_bswap64)

  return __builtin_bswap64(host_int);

#elif defined(_MSC_VER)

  return _byteswap_uint64(host_int);

#else

  return (((host_int & uint64_t{0xFF}) << 56) |

          ((host_int & uint64_t{0xFF00}) << 40) |

          ((host_int & uint64_t{0xFF0000}) << 24) |

          ((host_int & uint64_t{0xFF000000}) << 8) |

          ((host_int & uint64_t{0xFF00000000}) >> 8) |

          ((host_int & uint64_t{0xFF0000000000}) >> 24) |

          ((host_int & uint64_t{0xFF000000000000}) >> 40) |

          ((host_int & uint64_t{0xFF00000000000000}) >> 56));

#endif

}

inline uint32_t BSwap32(uint32_t host_int) {

#if defined(__GNUC__) || ABSL_HAVE_BUILTIN(__builtin_bswap32)

  return __builtin_bswap32(host_int);

#elif defined(_MSC_VER)

  return _byteswap_ulong(host_int);

#else

  return (((host_int & uint32_t{0xFF}) << 24) |

          ((host_int & uint32_t{0xFF00}) << 8) |

          ((host_int & uint32_t{0xFF0000}) >> 8) |

          ((host_int & uint32_t{0xFF000000}) >> 24));

#endif

}

inline uint16_t BSwap16(uint16_t host_int) {

#if defined(__GNUC__) || ABSL_HAVE_BUILTIN(__builtin_bswap16)

  return __builtin_bswap16(host_int);

#elif defined(_MSC_VER)

  return _byteswap_ushort(host_int);

#else

  return (((host_int & uint16_t{0xFF}) << 8) |

          ((host_int & uint16_t{0xFF00}) >> 8));

#endif

}

namespace little_endian {

inline uint16_t FromHost(uint16_t value) {

#if defined(ABSL_IS_BIG_ENDIAN)

  return BSwap16(value);

#else

  return value;

#endif

}

inline uint32_t FromHost(uint32_t value) {

#if defined(ABSL_IS_BIG_ENDIAN)

  return BSwap32(value);

#else

  return value;

#endif

}

inline uint64_t FromHost(uint64_t value) {

#if defined(ABSL_IS_BIG_ENDIAN)

  return BSwap64(value);

#else

  return value;

#endif

}

inline uint16_t ToHost(uint16_t value) {

#if defined(ABSL_IS_BIG_ENDIAN)

  return BSwap16(value);

#else

  return value;

#endif

}

inline uint32_t ToHost(uint32_t value) {

#if defined(ABSL_IS_BIG_ENDIAN)

  return BSwap32(value);

#else

  return value;

#endif

}

inline uint64_t ToHost(uint64_t value) {

#if defined(ABSL_IS_BIG_ENDIAN)

  return BSwap64(value);

#else

  return value;

#endif

}

}  // namespace little_endian

namespace big_endian {

inline uint16_t FromHost(uint16_t value) {

#if defined(ABSL_IS_BIG_ENDIAN)

  return value;

#else

  return BSwap16(value);

#endif

}

inline uint32_t FromHost(uint32_t value) {

#if defined(ABSL_IS_BIG_ENDIAN)

  return value;

#else

  return BSwap32(value);

#endif

}

inline uint64_t FromHost(uint64_t value) {

#if defined(ABSL_IS_BIG_ENDIAN)

  return value;

#else

  return BSwap64(value);

#endif

}

inline uint16_t ToHost(uint16_t value) {

#if defined(ABSL_IS_BIG_ENDIAN)

  return value;

#else

  return BSwap16(value);

#endif

}

inline uint32_t ToHost(uint32_t value) {

#if defined(ABSL_IS_BIG_ENDIAN)

  return value;

#else

  return BSwap32(value);

#endif

}

inline uint64_t ToHost(uint64_t value) {

#if defined(ABSL_IS_BIG_ENDIAN)

  return value;

#else

  return BSwap64(value);

#endif

}

}  // namespace big_endian

}  // namespace internal

}  // namespace protobuf

}  // namespace google

#include "google/protobuf/port_undef.inc"

#endif  // GOOGLE_PROTOBUF_ENDIAN_H__