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nmav |
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/* |
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* Copyright (C) 1998,1999 Nikos Mavroyanopoulos |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Library General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library 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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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Library General Public License for more details. |
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* |
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* You should have received a copy of the GNU Library General Public |
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* License along with this library; if not, write to the |
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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* Boston, MA 02111-1307, USA. |
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*/ |
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/* $Id: swap.c,v 1.1.1.1 1999/12/13 21:13:21 nikos Exp $ */ |
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#ifndef LIBDEFS_H |
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# define LIBDEFS_H |
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# include <libdefs.h> |
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#endif |
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#include <bzero.h> |
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#include <swap.h> |
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#include <xmemory.h> |
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#ifndef FAST |
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word32 rotl(word32 v, word32 cnt) |
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{ |
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cnt &= (32 - 1); |
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while (cnt--) |
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v = ((v << 1) | (v >> (32 - 1))); |
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return v; |
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} |
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/* rotate right */ |
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word32 rotr(word32 v, word32 cnt) |
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{ |
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cnt &= (32 - 1); |
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while (cnt--) |
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v = ((v >> 1) | (v << (32 - 1))); |
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return v; |
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} |
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word16 rotl16(word16 v, word16 cnt) |
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{ |
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cnt &= (16 - 1); |
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while (cnt--) |
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v = ((v << 1) | (v >> (16 - 1))); |
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return v; |
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} |
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/* rotate right */ |
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word16 rotr16(word16 v, word16 cnt) |
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{ |
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cnt &= (16 - 1); |
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while (cnt--) |
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v = ((v >> 1) | (v << (16 - 1))); |
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return v; |
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} |
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#endif |
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#ifndef FAST |
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/* Byte swap a 32bit integer */ |
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word32 byteswap(word32 x) |
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{ |
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return ((rotl(x, 8) & 0x00ff00ff) | (rotr(x, 8) & 0xff00ff00)); |
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} |
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#endif |
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/* Byte swap a 16bit integer */ |
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word16 byteswap_16(word16 x) |
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{ |
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return ( (rotl16(x, 8) & 0x00ff) | (rotr16(x, 8) & 0xff00) ); |
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} |