From c50dc5e888627bd1644f46585a44dc118c865127 Mon Sep 17 00:00:00 2001
From: Klaus Schmidinger <vdr@tvdr.de>
Date: Thu, 9 Aug 2001 11:41:39 +0200
Subject: Improvements from Matjaz Thaler

---
 ac3dec/bswap.h | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 ac3dec/bswap.h

(limited to 'ac3dec/bswap.h')

diff --git a/ac3dec/bswap.h b/ac3dec/bswap.h
new file mode 100644
index 00000000..73d398aa
--- /dev/null
+++ b/ac3dec/bswap.h
@@ -0,0 +1,80 @@
+/*****
+*
+* This file is part of the OMS program.
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by 
+* the Free Software Foundation; either version 2, or (at your option)
+* any later version.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with this program; see the file COPYING.  If not, write to
+* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+*
+*****/
+
+#ifndef __BSWAP_H__
+#define __BSWAP_H__
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#ifdef HAVE_BYTESWAP_H
+#include <byteswap.h>
+#else
+
+#include <inttypes.h>
+
+#ifdef WORDS_BIGENDIAN
+// FIXME these need to actually swap ;)
+#define bswap_16(x) (x)
+#define bswap_32(x) (x)
+#define bswap_64(x) (x)
+#else
+// This is wrong, 'cannot take address of ...'
+#define bswap_16(x) ((((uint8_t*)&x)[2] << 8) \
+			| (((uint8_t*)&x)[3]))
+
+// code from bits/byteswap.h (C) 1997, 1998 Free Software Foundation, Inc.
+#define bswap_32(x) \
+     ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >>  8) | \
+      (((x) & 0x0000ff00) <<  8) | (((x) & 0x000000ff) << 24))
+
+#define bswap_64(x) \
+     (__extension__						\
+      ({ union { __extension__ unsigned long long int __ll;	\
+                 unsigned long int __l[2]; } __w, __r;		\
+         __w.__ll = (x);					\
+         __r.__l[0] = bswap_32 (__w.__l[1]);			\
+         __r.__l[1] = bswap_32 (__w.__l[0]);			\
+         __r.__ll; }))
+#endif
+
+#endif
+
+// be2me ... BigEndian to MachineEndian
+// le2me ... LittleEndian to MachineEndian
+
+#ifdef WORDS_BIGENDIAN
+#define be2me_16(x) (x)
+#define be2me_32(x) (x)
+#define be2me_64(x) (x)
+#define le2me_16(x) bswap_16(x)
+#define le2me_32(x) bswap_32(x)
+#define le2me_64(x) bswap_64(x)
+#else
+#define be2me_16(x) bswap_16(x)
+#define be2me_32(x) bswap_32(x)
+#define be2me_64(x) bswap_64(x)
+#define le2me_16(x) (x)
+#define le2me_32(x) (x)
+#define le2me_64(x) (x)
+#endif
+
+#endif
-- 
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