es40_endian.h

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/* ES40 emulator.
 * Copyright (C) 2007-2008 by the ES40 Emulator Project
 *
 * WWW    : http://sourceforge.net/projects/es40
 * E-mail : camiel@camicom.com
 * 
 * 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
 * of the License, 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; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 * 
 * Although this is not required, the author would appreciate being notified of, 
 * and receiving any modifications you may make to the source code that might serve
 * the general public.
 */

#if !defined(INCLUDED_ENDIAN_H)
#define INCLUDED_ENDIAN_H

#if !defined(ES40_LITTLE_ENDIAN) && !defined(ES40_BIG_ENDIAN)
#if defined(_WIN32) || defined(__VMS)
#define ES40_LITTLE_ENDIAN
#else // defined (_WIN32) || defined(__VMS)
#include <sys/param.h>

#if !defined(__BYTE_ORDER) && defined(BYTE_ORDER)
#define __BYTE_ORDER  BYTE_ORDER
#if !defined(__BIG_ENDIAN) && defined(BIG_ENDIAN)
#define __BIG_ENDIAN  BIG_ENDIAN
#endif
#if !defined(__LITTLE_ENDIAN) && defined(LITTLE_ENDIAN)
#define __LITTLE_ENDIAN LITTLE_ENDIAN
#endif
#endif
#if (defined(__BYTE_ORDER) && (__BYTE_ORDER == __BIG_ENDIAN)) || defined(sparc)
#define ES40_BIG_ENDIAN
#else // assume little endian
#define ES40_LITTLE_ENDIAN
#endif
#endif // defined (_WIN32) || defined(__VMS)
#endif // !defined(ES40_LITTLE_ENDIAN) && !defined(ES40_BIG_ENDIAN)
#define swap_64(x)                                          \
    (                                                       \
      (((x) & U64(0x00000000000000ff)) << 56) |             \
        (((x) & U64(0x000000000000ff00)) << 40) |           \
          (((x) & U64(0x0000000000ff0000)) << 24) |         \
            (((x) & U64(0x00000000ff000000)) << 8) |        \
              (((x) & U64(0x000000ff00000000)) >> 8) |      \
                (((x) & U64(0x0000ff0000000000)) >> 24) |   \
                  (((x) & U64(0x00ff000000000000)) >> 40) | \
                    (((x) & U64(0xff00000000000000)) >> 56) \
    )
#define swap_32(x)                                             \
    (                                                          \
      (((x) & 0x000000ff) << 24) | (((x) & 0x0000ff00) << 8) | \
        (((x) & 0x00ff0000) >> 8) | (((x) & 0xff000000) >> 24) \
    )
#define swap_16(x)  ((((x) & 0x00ff) << 8) | (((x) & 0xff00) >> 8))
#define swap_8(x)   ((x) & 0xff)
#if defined(ES40_BIG_ENDIAN)
#define endian_64(x)  swap_64(x)
#define endian_32(x)  swap_32(x)
#define endian_16(x)  swap_16(x)
#define endian_8(x)   swap_8(x)
#else // defined(ES40_BIG_ENDIAN)
#define endian_64(x)  (x)
#define endian_32(x)  ((x) & 0xffffffff)
#define endian_16(x)  ((x) & 0xffff)
#define endian_8(x)   ((x) & 0xff)
#endif // defined(ES40_BIG_ENDIAN)
inline u64 endian_bits(u64 x, int numbits)
{
  switch(numbits)
  {
  case 64:  return endian_64(x);
  case 32:  return endian_32(x);
  case 16:  return endian_16(x);
  case 8:   return endian_8(x);
  default:  FAILURE(InvalidArgument, "Weird numbits in endian_bits");
  }
}
#endif //INCLUDED_ENDIAN_H

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