Roll libjingle 132:133

third_party/libjingle/overrides/talk/base/byteorder.h

-/*
- * libjingle
- * Copyright 2004--2005, Google Inc.
- *
- * Redistribution and use in source and binary forms, with or without 
- * modification, are permitted provided that the following conditions are met:
- *
- *  1. Redistributions of source code must retain the above copyright notice, 
- *     this list of conditions and the following disclaimer.
- *  2. Redistributions in binary form must reproduce the above copyright notice,
- *     this list of conditions and the following disclaimer in the documentation
- *     and/or other materials provided with the distribution.
- *  3. The name of the author may not be used to endorse or promote products 
- *     derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
- * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
- * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
- * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
- * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 
- * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
- * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef TALK_BASE_BYTEORDER_H__
-#define TALK_BASE_BYTEORDER_H__
-
-#ifdef POSIX
-#include <arpa/inet.h>
-#endif
-
-#ifdef WIN32
-#include <stdlib.h>
-#include <winsock2.h>
-#endif
-
-#include "talk/base/basictypes.h"
-
-namespace talk_base {
-
-// Reading and writing of little and big-endian numbers from memory
-// TODO: Add HostEndian #defines (HE)
-// TODO: Consider NetworkEndian as synonym for BigEndian, for clarity in use.
-// TODO: Consider creating optimized versions, such as direct read/writes of
-// integers in host-endian format, when the platform supports it.
-
-inline void Set8(void* memory, size_t offset, uint8 v) {
-  static_cast<uint8*>(memory)[offset] = v;
-}
-inline uint8 Get8(const void* memory, size_t offset) {
-  return static_cast<const uint8*>(memory)[offset];
-}
-
-inline void SetBE16(void* memory, uint16 v) {
-  Set8(memory, 0, static_cast<uint8>(v >>  8));
-  Set8(memory, 1, static_cast<uint8>(v >>  0));
-}
-inline void SetBE32(void* memory, uint32 v) {
-  Set8(memory, 0, static_cast<uint8>(v >> 24));
-  Set8(memory, 1, static_cast<uint8>(v >> 16));
-  Set8(memory, 2, static_cast<uint8>(v >>  8));
-  Set8(memory, 3, static_cast<uint8>(v >>  0));
-}
-inline void SetBE64(void* memory, uint64 v) {
-  Set8(memory, 0, static_cast<uint8>(v >> 56));
-  Set8(memory, 1, static_cast<uint8>(v >> 48));
-  Set8(memory, 2, static_cast<uint8>(v >> 40));
-  Set8(memory, 3, static_cast<uint8>(v >> 32));
-  Set8(memory, 4, static_cast<uint8>(v >> 24));
-  Set8(memory, 5, static_cast<uint8>(v >> 16));
-  Set8(memory, 6, static_cast<uint8>(v >>  8));
-  Set8(memory, 7, static_cast<uint8>(v >>  0));
-}
-inline uint16 GetBE16(const void* memory) {
-  return (static_cast<uint16>(Get8(memory, 0)) << 8)
-       | (static_cast<uint16>(Get8(memory, 1)) << 0);
-}
-inline uint32 GetBE32(const void* memory) {
-  return (static_cast<uint32>(Get8(memory, 0)) << 24)
-       | (static_cast<uint32>(Get8(memory, 1)) << 16)
-       | (static_cast<uint32>(Get8(memory, 2)) <<  8)
-       | (static_cast<uint32>(Get8(memory, 3)) <<  0);
-}
-inline uint64 GetBE64(const void* memory) {
-  return (static_cast<uint64>(Get8(memory, 0)) << 56)
-       | (static_cast<uint64>(Get8(memory, 1)) << 48)
-       | (static_cast<uint64>(Get8(memory, 2)) << 40)
-       | (static_cast<uint64>(Get8(memory, 3)) << 32)
-       | (static_cast<uint64>(Get8(memory, 4)) << 24)
-       | (static_cast<uint64>(Get8(memory, 5)) << 16)
-       | (static_cast<uint64>(Get8(memory, 6)) <<  8)
-       | (static_cast<uint64>(Get8(memory, 7)) <<  0);
-}
-
-inline void SetLE16(void* memory, uint16 v) {
-  Set8(memory, 1, static_cast<uint8>(v >>  8));
-  Set8(memory, 0, static_cast<uint8>(v >>  0));
-}
-inline void SetLE32(void* memory, uint32 v) {
-  Set8(memory, 3, static_cast<uint8>(v >> 24));
-  Set8(memory, 2, static_cast<uint8>(v >> 16));
-  Set8(memory, 1, static_cast<uint8>(v >>  8));
-  Set8(memory, 0, static_cast<uint8>(v >>  0));
-}
-inline void SetLE64(void* memory, uint64 v) {
-  Set8(memory, 7, static_cast<uint8>(v >> 56));
-  Set8(memory, 6, static_cast<uint8>(v >> 48));
-  Set8(memory, 5, static_cast<uint8>(v >> 40));
-  Set8(memory, 4, static_cast<uint8>(v >> 32));
-  Set8(memory, 3, static_cast<uint8>(v >> 24));
-  Set8(memory, 2, static_cast<uint8>(v >> 16));
-  Set8(memory, 1, static_cast<uint8>(v >>  8));
-  Set8(memory, 0, static_cast<uint8>(v >>  0));
-}
-inline uint16 GetLE16(const void* memory) {
-  return (static_cast<uint16>(Get8(memory, 1)) << 8)
-       | (static_cast<uint16>(Get8(memory, 0)) << 0);
-}
-inline uint32 GetLE32(const void* memory) {
-  return (static_cast<uint32>(Get8(memory, 3)) << 24)
-       | (static_cast<uint32>(Get8(memory, 2)) << 16)
-       | (static_cast<uint32>(Get8(memory, 1)) <<  8)
-       | (static_cast<uint32>(Get8(memory, 0)) <<  0);
-}
-inline uint64 GetLE64(const void* memory) {
-  return (static_cast<uint64>(Get8(memory, 7)) << 56)
-       | (static_cast<uint64>(Get8(memory, 6)) << 48)
-       | (static_cast<uint64>(Get8(memory, 5)) << 40)
-       | (static_cast<uint64>(Get8(memory, 4)) << 32)
-       | (static_cast<uint64>(Get8(memory, 3)) << 24)
-       | (static_cast<uint64>(Get8(memory, 2)) << 16)
-       | (static_cast<uint64>(Get8(memory, 1)) <<  8)
-       | (static_cast<uint64>(Get8(memory, 0)) <<  0);
-}
-
-// 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 HostToNetwork16(uint16 n) {
-#ifdef WIN32
-  // This and below _byteswap_* are to remove the dependency to ws2_32.dll
-  // especially for chrome, where we don't load the ws2_32.dll in the render
-  // process. This is correct only on little-endian machines.
-  return _byteswap_ushort(n);
-#else
-  return htons(n);
-#endif
-}
-
-inline uint32 HostToNetwork32(uint32 n) {
-#ifdef WIN32
-  return _byteswap_ulong(n);
-#else
-  return htonl(n);
-#endif
-}
-
-inline uint64 HostToNetwork64(uint64 n) {
-  // If the host is little endian, GetBE64 converts n to big network endian.
-  return IsHostBigEndian() ? n : GetBE64(&n);
-}
-
-inline uint16 NetworkToHost16(uint16 n) {
-#ifdef WIN32
-  return _byteswap_ushort(n);
-#else
-  return ntohs(n);
-#endif
-}
-
-inline uint32 NetworkToHost32(uint32 n) {
-#ifdef WIN32
-  return _byteswap_ulong(n);
-#else
-  return ntohl(n);
-#endif
-}
-
-inline uint64 NetworkToHost64(uint64 n) {
-  // If the host is little endian, GetBE64 converts n to little endian.
-  return IsHostBigEndian() ? n : GetBE64(&n);
-}
-
-}  // namespace talk_base
-
-#endif  // TALK_BASE_BYTEORDER_H__