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// 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 __APPLE__
#include <CoreFoundation/CoreFoundation.h>
inline short LittleShort(short x)
{
return (short)CFSwapInt16LittleToHost((uint16_t)x);
}
inline unsigned short LittleShort(unsigned short x)
{
return CFSwapInt16LittleToHost(x);
}
inline short LittleShort(int x)
{
return CFSwapInt16LittleToHost((uint16_t)x);
}
inline int LittleLong(int x)
{
return CFSwapInt32LittleToHost((uint32_t)x);
}
inline unsigned int LittleLong(unsigned int x)
{
return CFSwapInt32LittleToHost(x);
}
inline short BigShort(short x)
{
return (short)CFSwapInt16BigToHost((uint16_t)x);
}
inline unsigned short BigShort(unsigned short x)
{
return CFSwapInt16BigToHost(x);
}
inline int BigLong(int x)
{
return CFSwapInt32BigToHost((uint32_t)x);
}
inline unsigned int BigLong(unsigned int x)
{
return CFSwapInt32BigToHost(x);
}
#else
#ifdef __BIG_ENDIAN__
// 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
#endif // __BIG_ENDIAN__
#endif // __APPLE__
// Data accessors, since some data is highly likely to be unaligned.
#if defined(_M_IX86) || defined(_M_X64) || defined(__i386__)
inline int GetShort(const unsigned char *foo)
{
return *(const short *)foo;
}
inline int GetInt(const unsigned char *foo)
{
return *(const int *)foo;
}
inline int GetBigInt(const unsigned char *foo)
{
return BigLong(GetInt(foo));
}
#else
inline int GetShort(const unsigned char *foo)
{
return short(foo[0] | (foo[1] << 8));
}
inline int GetInt(const unsigned char *foo)
{
return int(foo[0] | (foo[1] << 8) | (foo[2] << 16) | (foo[3] << 24));
}
inline int GetBigInt(const unsigned char *foo)
{
return int((foo[0] << 24) | (foo[1] << 16) | (foo[2] << 8) | foo[3]);
}
#endif
#ifdef __BIG_ENDIAN__
inline int GetNativeInt(const unsigned char *foo)
{
return GetBigInt(foo);
}
#else
inline int GetNativeInt(const unsigned char *foo)
{
return GetInt(foo);
}
#endif
#endif // __M_SWAP_H__
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