99 lines
3.7 KiB
C
99 lines
3.7 KiB
C
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/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
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/* ====================================================================
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* Copyright (c) 1999-2001 Carnegie Mellon University. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* This work was supported in part by funding from the Defense Advanced
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* Research Projects Agency and the National Science Foundation of the
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* United States of America, and the CMU Sphinx Speech Consortium.
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*
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* THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND
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* ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
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* NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* ====================================================================
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*
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*/
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/*
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* byteorder.h -- Byte swapping ordering macros.
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*
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* **********************************************
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* CMU ARPA Speech Project
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*
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* Copyright (c) 1996 Carnegie Mellon University.
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* ALL RIGHTS RESERVED.
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* **********************************************
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*
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* HISTORY
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*
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* $Log: byteorder.h,v $
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* Revision 1.8 2005/09/01 21:09:54 dhdfu
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* Really, actually, truly consolidate byteswapping operations into
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* byteorder.h. Where unconditional byteswapping is needed, SWAP_INT32()
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* and SWAP_INT16() are to be used. The WORDS_BIGENDIAN macro from
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* autoconf controls the functioning of the conditional swap macros
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* (SWAP_?[LW]) whose names and semantics have been regularized.
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* Private, adhoc macros have been removed.
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*
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*/
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#ifndef __S2_BYTEORDER_H__
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#define __S2_BYTEORDER_H__ 1
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/* Macro to byteswap an int16 variable. x = ptr to variable */
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#define SWAP_INT16(x) *(x) = ((0x00ff & (*(x))>>8) | (0xff00 & (*(x))<<8))
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/* Macro to byteswap an int32 variable. x = ptr to variable */
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#define SWAP_INT32(x) *(x) = ((0x000000ff & (*(x))>>24) | \
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(0x0000ff00 & (*(x))>>8) | \
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(0x00ff0000 & (*(x))<<8) | \
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(0xff000000 & (*(x))<<24))
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/* Macro to byteswap a float32 variable. x = ptr to variable */
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#define SWAP_FLOAT32(x) SWAP_INT32((int32 *) x)
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/* Macro to byteswap a float64 variable. x = ptr to variable */
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#define SWAP_FLOAT64(x) { int *low = (int *) (x), *high = (int *) (x) + 1,\
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temp;\
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SWAP_INT32(low); SWAP_INT32(high);\
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temp = *low; *low = *high; *high = temp;}
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#ifdef WORDS_BIGENDIAN
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#define SWAP_BE_64(x)
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#define SWAP_BE_32(x)
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#define SWAP_BE_16(x)
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#define SWAP_LE_64(x) SWAP_FLOAT64(x)
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#define SWAP_LE_32(x) SWAP_INT32(x)
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#define SWAP_LE_16(x) SWAP_INT16(x)
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#else
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#define SWAP_LE_64(x)
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#define SWAP_LE_32(x)
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#define SWAP_LE_16(x)
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#define SWAP_BE_64(x) SWAP_FLOAT64(x)
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#define SWAP_BE_32(x) SWAP_INT32(x)
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#define SWAP_BE_16(x) SWAP_INT16(x)
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#endif
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#endif
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