28e2075280
trunk/talk git-svn-id: http://webrtc.googlecode.com/svn/trunk@4318 4adac7df-926f-26a2-2b94-8c16560cd09d
186 lines
6.1 KiB
C++
186 lines
6.1 KiB
C++
/*
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* libjingle
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* Copyright 2004 Google Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TALK_BASE_BYTEORDER_H_
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#define TALK_BASE_BYTEORDER_H_
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#ifdef POSIX
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#include <arpa/inet.h>
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#endif
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#ifdef WIN32
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#include <stdlib.h>
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#endif
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#include "talk/base/basictypes.h"
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namespace talk_base {
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// Reading and writing of little and big-endian numbers from memory
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// TODO: Optimized versions, with direct read/writes of
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// integers in host-endian format, when the platform supports it.
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inline void Set8(void* memory, size_t offset, uint8 v) {
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static_cast<uint8*>(memory)[offset] = v;
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}
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inline uint8 Get8(const void* memory, size_t offset) {
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return static_cast<const uint8*>(memory)[offset];
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}
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inline void SetBE16(void* memory, uint16 v) {
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Set8(memory, 0, static_cast<uint8>(v >> 8));
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Set8(memory, 1, static_cast<uint8>(v >> 0));
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}
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inline void SetBE32(void* memory, uint32 v) {
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Set8(memory, 0, static_cast<uint8>(v >> 24));
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Set8(memory, 1, static_cast<uint8>(v >> 16));
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Set8(memory, 2, static_cast<uint8>(v >> 8));
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Set8(memory, 3, static_cast<uint8>(v >> 0));
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}
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inline void SetBE64(void* memory, uint64 v) {
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Set8(memory, 0, static_cast<uint8>(v >> 56));
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Set8(memory, 1, static_cast<uint8>(v >> 48));
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Set8(memory, 2, static_cast<uint8>(v >> 40));
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Set8(memory, 3, static_cast<uint8>(v >> 32));
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Set8(memory, 4, static_cast<uint8>(v >> 24));
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Set8(memory, 5, static_cast<uint8>(v >> 16));
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Set8(memory, 6, static_cast<uint8>(v >> 8));
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Set8(memory, 7, static_cast<uint8>(v >> 0));
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}
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inline uint16 GetBE16(const void* memory) {
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return static_cast<uint16>((Get8(memory, 0) << 8) |
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(Get8(memory, 1) << 0));
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}
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inline uint32 GetBE32(const void* memory) {
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return (static_cast<uint32>(Get8(memory, 0)) << 24) |
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(static_cast<uint32>(Get8(memory, 1)) << 16) |
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(static_cast<uint32>(Get8(memory, 2)) << 8) |
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(static_cast<uint32>(Get8(memory, 3)) << 0);
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}
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inline uint64 GetBE64(const void* memory) {
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return (static_cast<uint64>(Get8(memory, 0)) << 56) |
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(static_cast<uint64>(Get8(memory, 1)) << 48) |
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(static_cast<uint64>(Get8(memory, 2)) << 40) |
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(static_cast<uint64>(Get8(memory, 3)) << 32) |
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(static_cast<uint64>(Get8(memory, 4)) << 24) |
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(static_cast<uint64>(Get8(memory, 5)) << 16) |
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(static_cast<uint64>(Get8(memory, 6)) << 8) |
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(static_cast<uint64>(Get8(memory, 7)) << 0);
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}
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inline void SetLE16(void* memory, uint16 v) {
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Set8(memory, 0, static_cast<uint8>(v >> 0));
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Set8(memory, 1, static_cast<uint8>(v >> 8));
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}
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inline void SetLE32(void* memory, uint32 v) {
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Set8(memory, 0, static_cast<uint8>(v >> 0));
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Set8(memory, 1, static_cast<uint8>(v >> 8));
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Set8(memory, 2, static_cast<uint8>(v >> 16));
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Set8(memory, 3, static_cast<uint8>(v >> 24));
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}
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inline void SetLE64(void* memory, uint64 v) {
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Set8(memory, 0, static_cast<uint8>(v >> 0));
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Set8(memory, 1, static_cast<uint8>(v >> 8));
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Set8(memory, 2, static_cast<uint8>(v >> 16));
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Set8(memory, 3, static_cast<uint8>(v >> 24));
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Set8(memory, 4, static_cast<uint8>(v >> 32));
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Set8(memory, 5, static_cast<uint8>(v >> 40));
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Set8(memory, 6, static_cast<uint8>(v >> 48));
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Set8(memory, 7, static_cast<uint8>(v >> 56));
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}
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inline uint16 GetLE16(const void* memory) {
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return static_cast<uint16>((Get8(memory, 0) << 0) |
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(Get8(memory, 1) << 8));
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}
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inline uint32 GetLE32(const void* memory) {
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return (static_cast<uint32>(Get8(memory, 0)) << 0) |
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(static_cast<uint32>(Get8(memory, 1)) << 8) |
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(static_cast<uint32>(Get8(memory, 2)) << 16) |
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(static_cast<uint32>(Get8(memory, 3)) << 24);
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}
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inline uint64 GetLE64(const void* memory) {
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return (static_cast<uint64>(Get8(memory, 0)) << 0) |
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(static_cast<uint64>(Get8(memory, 1)) << 8) |
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(static_cast<uint64>(Get8(memory, 2)) << 16) |
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(static_cast<uint64>(Get8(memory, 3)) << 24) |
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(static_cast<uint64>(Get8(memory, 4)) << 32) |
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(static_cast<uint64>(Get8(memory, 5)) << 40) |
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(static_cast<uint64>(Get8(memory, 6)) << 48) |
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(static_cast<uint64>(Get8(memory, 7)) << 56);
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}
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// Check if the current host is big endian.
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inline bool IsHostBigEndian() {
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static const int number = 1;
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return 0 == *reinterpret_cast<const char*>(&number);
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}
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inline uint16 HostToNetwork16(uint16 n) {
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uint16 result;
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SetBE16(&result, n);
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return result;
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}
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inline uint32 HostToNetwork32(uint32 n) {
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uint32 result;
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SetBE32(&result, n);
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return result;
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}
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inline uint64 HostToNetwork64(uint64 n) {
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uint64 result;
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SetBE64(&result, n);
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return result;
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}
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inline uint16 NetworkToHost16(uint16 n) {
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return GetBE16(&n);
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}
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inline uint32 NetworkToHost32(uint32 n) {
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return GetBE32(&n);
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}
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inline uint64 NetworkToHost64(uint64 n) {
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return GetBE64(&n);
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}
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} // namespace talk_base
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#endif // TALK_BASE_BYTEORDER_H_
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