lv_bits.h

/* Libvisual - The audio visualisation framework.
 *
 * Copyright (C) 2012      Libvisual team
 *               2004-2006 Dennis Smit
 *
 * Authors: Dennis Smit <ds@nerds-incorporated.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1
 * 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#ifndef _LV_ENDIANESS_H
#define _LV_ENDIANESS_H

#include <libvisual/lvconfig.h>
#include <libvisual/lv_defines.h>

LV_BEGIN_DECLS

#define VISUAL_ENDIAN_LE_BE_I16(w) (\
    (((w) & 0xff00) >> 8) |\
    (((w) & 0x00ff) << 8) )

#define VISUAL_ENDIAN_LE_BE_I32(w) (\
    (((w) & 0x000000ff) << 24) | \
    (((w) & 0x0000ff00) << 8) | \
    (((w) & 0x00ff0000) >> 8) | \
    (((w) & 0xff000000) >> 24) )


#if ! ((VISUAL_BIG_ENDIAN) | (VISUAL_LITTLE_ENDIAN))
#   error determining system endianess. (none set)
#endif

#if ((VISUAL_BIG_ENDIAN == 1) & (VISUAL_LITTLE_ENDIAN == 1))
#       error determing system endianess (both set?)
#endif

#if VISUAL_BIG_ENDIAN == 1
#   define VISUAL_ENDIAN_BEI16(x) (x)
#   define VISUAL_ENDIAN_BEI32(x) (x)
#   define VISUAL_ENDIAN_LEI16(x) VISUAL_ENDIAN_LE_BE_I16(x)
#   define VISUAL_ENDIAN_LEI32(x) VISUAL_ENDIAN_LE_BE_I32(x)
#else
#   define VISUAL_ENDIAN_LEI16(x) (x)
#   define VISUAL_ENDIAN_LEI32(x) (x)
#   define VISUAL_ENDIAN_BEI16(x) VISUAL_ENDIAN_LE_BE_I16(x)
#   define VISUAL_ENDIAN_BEI32(x) VISUAL_ENDIAN_LE_BE_I32(x)
#endif

#define VISUAL_ALIGNED(x, y)    (!(((intptr_t) x) & (y - 1)))

LV_END_DECLS

#endif /* _LV_ENDIANESS_H */