/*
* 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 <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) {
return htons(n);
}
inline uint32 HostToNetwork32(uint32 n) {
return htonl(n);
}
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) {
return ntohs(n);
}
inline uint32 NetworkToHost32(uint32 n) {
return ntohl(n);
}
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__