78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
// Emacs style mode select -*- C++ -*-
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//-----------------------------------------------------------------------------
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//
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// $Id:$
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//
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// Copyright (C) 1993-1996 by id Software, Inc.
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//
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// This source is available for distribution and/or modification
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// only under the terms of the DOOM Source Code License as
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// published by id Software. All rights reserved.
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//
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// The source is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License
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// for more details.
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//
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// $Log:$
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//
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// DESCRIPTION:
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// Endianess handling, swapping 16bit and 32bit.
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//
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//-----------------------------------------------------------------------------
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//static const char
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#include "os.h"
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#ifdef __GNUG__
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#pragma implementation "m_swap.h"
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#endif
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#include "m_swap.h"
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// Swap 16bit, that is, MSB and LSB byte.
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unsigned short SwapSHORT(const unsigned short x)
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{
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#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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// No masking with 0xFF should be necessary.
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return (x>>8) | (x<<8);
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#else
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return x;
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#endif
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}
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// Swapping 32bit.
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unsigned long SwapLONG(const unsigned long x)
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{
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#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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return
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(x>>24)
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| ((x>>8) & 0xff00)
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| ((x<<8) & 0xff0000)
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| (x<<24);
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#else
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return x;
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#endif
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}
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unsigned short SHORTFromBytes(const unsigned char *pData)
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{
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unsigned short w = pData[1];
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w <<= 8;
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w |= pData[0];
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return w;
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}
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unsigned int INTFromBytes(const unsigned char *pData)
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{
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unsigned int i = pData[3];
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i <<= 8;
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i |= pData[2];
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i <<= 8;
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i |= pData[1];
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i <<= 8;
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i |= pData[0];
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return i;
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}
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