mirror of
https://github.com/ZDoom/qzdoom.git
synced 2024-11-16 01:12:03 +00:00
127 lines
2.7 KiB
C++
127 lines
2.7 KiB
C++
// Emacs style mode select -*- C++ -*-
|
|
//-----------------------------------------------------------------------------
|
|
//
|
|
// $Id:$
|
|
//
|
|
// Copyright (C) 1993-1996 by id Software, Inc.
|
|
//
|
|
// This source is available for distribution and/or modification
|
|
// only under the terms of the DOOM Source Code License as
|
|
// published by id Software. All rights reserved.
|
|
//
|
|
// The source is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
|
|
// for more details.
|
|
//
|
|
// DESCRIPTION:
|
|
// Endianess handling, swapping 16bit and 32bit.
|
|
//
|
|
//-----------------------------------------------------------------------------
|
|
|
|
|
|
#ifndef __M_SWAP_H__
|
|
#define __M_SWAP_H__
|
|
|
|
#include <stdlib.h>
|
|
|
|
// Endianess handling.
|
|
// WAD files are stored little endian.
|
|
#ifdef WORDS_BIGENDIAN
|
|
|
|
// Swap 16bit, that is, MSB and LSB byte.
|
|
// No masking with 0xFF should be necessary.
|
|
inline short LittleShort (short x)
|
|
{
|
|
return (short)((((unsigned short)x)>>8) | (((unsigned short)x)<<8));
|
|
}
|
|
|
|
inline unsigned short LittleShort (unsigned short x)
|
|
{
|
|
return (unsigned short)((x>>8) | (x<<8));
|
|
}
|
|
|
|
// Swapping 32bit.
|
|
inline unsigned int LittleLong (unsigned int x)
|
|
{
|
|
return (unsigned int)(
|
|
(x>>24)
|
|
| ((x>>8) & 0xff00)
|
|
| ((x<<8) & 0xff0000)
|
|
| (x<<24));
|
|
}
|
|
|
|
inline int LittleLong (int x)
|
|
{
|
|
return (int)(
|
|
(((unsigned int)x)>>24)
|
|
| ((((unsigned int)x)>>8) & 0xff00)
|
|
| ((((unsigned int)x)<<8) & 0xff0000)
|
|
| (((unsigned int)x)<<24));
|
|
}
|
|
|
|
#define BigShort(x) (x)
|
|
#define BigLong(x) (x)
|
|
|
|
#else
|
|
|
|
#define LittleShort(x) (x)
|
|
#define LittleLong(x) (x)
|
|
|
|
#if defined(_MSC_VER)
|
|
|
|
inline short BigShort (short x)
|
|
{
|
|
return (short)_byteswap_ushort((unsigned short)x);
|
|
}
|
|
|
|
inline unsigned short BigShort (unsigned short x)
|
|
{
|
|
return _byteswap_ushort(x);
|
|
}
|
|
|
|
inline int BigLong (int x)
|
|
{
|
|
return (int)_byteswap_ulong((unsigned long)x);
|
|
}
|
|
|
|
inline unsigned int BigLong (unsigned int x)
|
|
{
|
|
return (unsigned int)_byteswap_ulong((unsigned long)x);
|
|
}
|
|
#pragma warning (default: 4035)
|
|
|
|
#else
|
|
|
|
inline short BigShort (short x)
|
|
{
|
|
return (short)((((unsigned short)x)>>8) | (((unsigned short)x)<<8));
|
|
}
|
|
|
|
inline unsigned short BigShort (unsigned short x)
|
|
{
|
|
return (unsigned short)((x>>8) | (x<<8));
|
|
}
|
|
|
|
inline unsigned int BigLong (unsigned int x)
|
|
{
|
|
return (unsigned int)(
|
|
(x>>24)
|
|
| ((x>>8) & 0xff00)
|
|
| ((x<<8) & 0xff0000)
|
|
| (x<<24));
|
|
}
|
|
|
|
inline int BigLong (int x)
|
|
{
|
|
return (int)(
|
|
(((unsigned int)x)>>24)
|
|
| ((((unsigned int)x)>>8) & 0xff00)
|
|
| ((((unsigned int)x)<<8) & 0xff0000)
|
|
| (((unsigned int)x)<<24));
|
|
}
|
|
#endif // USEASM
|
|
|
|
#endif // WORDS_BIGENDIAN
|
|
|
|
#endif // __M_SWAP_H__
|