byte order form webrtc soure file

/* *  Copyright 2004 The WebRTC Project Authors. All rights reserved. * *  Use of this source code is governed by a BSD-style license *  that can be found in the LICENSE file in the root of the source *  tree. An additional intellectual property rights grant can be found *  in the file PATENTS.  All contributing project authors may *  be found in the AUTHORS file in the root of the source tree. */// Reading and writing of little and big-endian numbers from memory// TODO: Optimized versions, with direct read/writes of// integers in host-endian format, when the platform supports it.#include <stdint.h>#include <stddef.h>inline void Set8(void* memory, size_t offset, uint8_t v) {  static_cast<uint8_t*>(memory)[offset] = v;}inline uint8_t Get8(const void* memory, size_t offset) {  return static_cast<const uint8_t*>(memory)[offset];}inline void SetBE16(void* memory, uint16_t v) {  Set8(memory, 0, static_cast<uint8_t>(v >> 8));  Set8(memory, 1, static_cast<uint8_t>(v >> 0));}inline void SetBE32(void* memory, uint32_t v) {  Set8(memory, 0, static_cast<uint8_t>(v >> 24));  Set8(memory, 1, static_cast<uint8_t>(v >> 16));  Set8(memory, 2, static_cast<uint8_t>(v >> 8));  Set8(memory, 3, static_cast<uint8_t>(v >> 0));}inline void SetBE64(void* memory, uint64_t v) {  Set8(memory, 0, static_cast<uint8_t>(v >> 56));  Set8(memory, 1, static_cast<uint8_t>(v >> 48));  Set8(memory, 2, static_cast<uint8_t>(v >> 40));  Set8(memory, 3, static_cast<uint8_t>(v >> 32));  Set8(memory, 4, static_cast<uint8_t>(v >> 24));  Set8(memory, 5, static_cast<uint8_t>(v >> 16));  Set8(memory, 6, static_cast<uint8_t>(v >> 8));  Set8(memory, 7, static_cast<uint8_t>(v >> 0));}inline uint16_t GetBE16(const void* memory) {  return static_cast<uint16_t>((Get8(memory, 0) << 8) | (Get8(memory, 1) << 0));}inline uint32_t GetBE32(const void* memory) {  return (static_cast<uint32_t>(Get8(memory, 0)) << 24) |         (static_cast<uint32_t>(Get8(memory, 1)) << 16) |         (static_cast<uint32_t>(Get8(memory, 2)) << 8) |         (static_cast<uint32_t>(Get8(memory, 3)) << 0);}inline uint64_t GetBE64(const void* memory) {  return (static_cast<uint64_t>(Get8(memory, 0)) << 56) |         (static_cast<uint64_t>(Get8(memory, 1)) << 48) |         (static_cast<uint64_t>(Get8(memory, 2)) << 40) |         (static_cast<uint64_t>(Get8(memory, 3)) << 32) |         (static_cast<uint64_t>(Get8(memory, 4)) << 24) |         (static_cast<uint64_t>(Get8(memory, 5)) << 16) |         (static_cast<uint64_t>(Get8(memory, 6)) << 8) |         (static_cast<uint64_t>(Get8(memory, 7)) << 0);}inline void SetLE16(void* memory, uint16_t v) {  Set8(memory, 0, static_cast<uint8_t>(v >> 0));  Set8(memory, 1, static_cast<uint8_t>(v >> 8));}inline void SetLE32(void* memory, uint32_t v) {  Set8(memory, 0, static_cast<uint8_t>(v >> 0));  Set8(memory, 1, static_cast<uint8_t>(v >> 8));  Set8(memory, 2, static_cast<uint8_t>(v >> 16));  Set8(memory, 3, static_cast<uint8_t>(v >> 24));}inline void SetLE64(void* memory, uint64_t v) {  Set8(memory, 0, static_cast<uint8_t>(v >> 0));  Set8(memory, 1, static_cast<uint8_t>(v >> 8));  Set8(memory, 2, static_cast<uint8_t>(v >> 16));  Set8(memory, 3, static_cast<uint8_t>(v >> 24));  Set8(memory, 4, static_cast<uint8_t>(v >> 32));  Set8(memory, 5, static_cast<uint8_t>(v >> 40));  Set8(memory, 6, static_cast<uint8_t>(v >> 48));  Set8(memory, 7, static_cast<uint8_t>(v >> 56));}inline uint16_t GetLE16(const void* memory) {  return static_cast<uint16_t>((Get8(memory, 0) << 0) | (Get8(memory, 1) << 8));}inline uint32_t GetLE32(const void* memory) {  return (static_cast<uint32_t>(Get8(memory, 0)) << 0) |         (static_cast<uint32_t>(Get8(memory, 1)) << 8) |         (static_cast<uint32_t>(Get8(memory, 2)) << 16) |         (static_cast<uint32_t>(Get8(memory, 3)) << 24);}inline uint64_t GetLE64(const void* memory) {  return (static_cast<uint64_t>(Get8(memory, 0)) << 0) |         (static_cast<uint64_t>(Get8(memory, 1)) << 8) |         (static_cast<uint64_t>(Get8(memory, 2)) << 16) |         (static_cast<uint64_t>(Get8(memory, 3)) << 24) |         (static_cast<uint64_t>(Get8(memory, 4)) << 32) |         (static_cast<uint64_t>(Get8(memory, 5)) << 40) |         (static_cast<uint64_t>(Get8(memory, 6)) << 48) |         (static_cast<uint64_t>(Get8(memory, 7)) << 56);}// Check if the current host is big endian.inline bool IsHostBigEndian() {  static const int number = 1;  return 0 == *reinterpret_cast<const char*>(&number);}inline uint16_t HostToNetwork16(uint16_t n) {  uint16_t result;  SetBE16(&result, n);  return result;}inline uint32_t HostToNetwork32(uint32_t n) {  uint32_t result;  SetBE32(&result, n);  return result;}inline uint64_t HostToNetwork64(uint64_t n) {  uint64_t result;  SetBE64(&result, n);  return result;}inline uint16_t NetworkToHost16(uint16_t n) {  return GetBE16(&n);}inline uint32_t NetworkToHost32(uint32_t n) {  return GetBE32(&n);}inline uint64_t NetworkToHost64(uint64_t n) {  return GetBE64(&n);}