CWE-ou-minkata/Sources/Plasma/NucleusLib/pnUtils/Private/pnUtEndian.h

/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011 Cyan Worlds, Inc.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.

Additional permissions under GNU GPL version 3 section 7

If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent
JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK
(or a modified version of those libraries),
containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA,
PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG
JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the
licensors of this Program grant you additional
permission to convey the resulting work. Corresponding Source for a
non-source form of such a combination shall include the source code for
the parts of OpenSSL and IJG JPEG Library used as well as that of the covered
work.

You can contact Cyan Worlds, Inc. by email legal@cyan.com
 or by snail mail at:
      Cyan Worlds, Inc.
      14617 N Newport Hwy
      Mead, WA   99021

*==LICENSE==*/
/*****************************************************************************
*
*   $/Plasma20/Sources/Plasma/NucleusLib/pnUtils/Private/pnUtEndian.h
*   
***/

#ifdef PLASMA20_SOURCES_PLASMA_NUCLEUSLIB_PNUTILS_PRIVATE_PNUTENDIAN_H
#error "Header $/Plasma20/Sources/Plasma/NucleusLib/pnUtils/Private/pnUtEndian.h included more than once"
#endif
#define PLASMA20_SOURCES_PLASMA_NUCLEUSLIB_PNUTILS_PRIVATE_PNUTENDIAN_H

// NOTE: Because we predominantly run on little-endian CPUs, we don't
// convert to "network order" when sending integers across the network
// (tcp uses big-endian regardless of underlying hardware) and instead
// use little-endian as the "native" language of our network messages.


/*****************************************************************************
*
*   Types and constants
*
***/

#ifdef _M_IX86
# define LITTLE_ENDIAN  1
#else
# define BIG_ENDIAN     1
// That was a pretty weak check for endian-ness, if it
// failed then we probably need to strengthen it a bit.
# error "Are you sure this is a big-endian CPU?"
#endif


/*****************************************************************************
*
*   Little endian functions
*
***/

#ifdef LITTLE_ENDIAN

//============================================================================
inline word  Endian (word value)    { return value; }
inline dword Endian (dword value)   { return value; }
inline qword Endian (qword value)   { return value; }

//===========================================================================
inline void EndianConvert (
    word *      array, 
    unsigned    count
) {
    return; 
}

//===========================================================================
inline void EndianConvert (
    dword *     array, 
    unsigned    count
) {
    return; 
}

//===========================================================================
inline void EndianConvert (
    qword *     array, 
    unsigned    count
) {
    return; 
}

//===========================================================================
inline void EndianConvert (
    byte *      data,
    unsigned    elemCount,
    unsigned    elemBytes
) {
    return;
}

//===========================================================================
inline void EndianCopy (
    word *      dst, 
    const word  src[], 
    unsigned    count
) {
    MemCopy(dst, src, count * sizeof(word));
}

//===========================================================================
inline void EndianCopy (
    dword *     dst, 
    const dword src[], 
    unsigned    count
) {
    MemCopy(dst, src, count * sizeof(dword));
}

//===========================================================================
inline void EndianCopy (
    qword *     dst, 
    const qword src[], 
    unsigned    count
) {
    MemCopy(dst, src, count * sizeof(qword));
}

//===========================================================================
inline void EndianCopy (
    void *      dst, 
    const byte  src[], 
    unsigned    elemCount,
    unsigned    elemBytes
) {
    MemCopy(dst, src, elemCount * elemBytes);
}



#endif // LITTLE_ENDIAN


/*****************************************************************************
*
*   Big endian functions
*
***/

#ifdef BIG_ENDIAN

//===========================================================================
inline word Endian (word value) { 
    return (value >> 8) | (value << 8); 
}

//===========================================================================
inline dword Endian (dword value) {
    return ((value)              << 24) | 
           ((value & 0x0000ff00) << 8)  |
           ((value & 0x00ff0000) >> 8)  |
           ((value)              >> 24);
}

//===========================================================================
inline qword Endian (qword value) {
    return ((value)                      << 56) | 
           ((value & 0x000000000000ff00) << 40) |
           ((value & 0x0000000000ff0000) << 24) |
           ((value & 0x00000000ff000000) << 8)  |
           ((value & 0x000000ff00000000) >> 8)  |
           ((value & 0x0000ff0000000000) >> 24) |
           ((value & 0x00ff000000000000) >> 40) |
           ((value)                      >> 56);
}

void EndianConvert (word * array, unsigned count);
void EndianConvert (dword * array, unsigned count);
void EndianConvert (qword * array, unsigned count);
void EndianConvert (byte * data, unsigned elemCount, unsigned elemBytes);
void EndianCopy (word * dst, const word src[], unsigned count);
void EndianCopy (dword * dst, const dword src[], unsigned count);
void EndianCopy (qword * dst, const dword src[], unsigned count);
void EndianCopy (void * dst, const byte src[], unsigned elemCount, unsigned elemBytes);

#endif