/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * 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.
 *
 * Contributor(s): Campbell Barton
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/* only include from header */
#ifndef __BLI_ENDIAN_SWITCH_H__
#  error "this file isnt to be directly included"
#endif

#ifndef __BLI_ENDIAN_SWITCH_INLINE_H__
#define __BLI_ENDIAN_SWITCH_INLINE_H__

/** \file blender/blenlib/BLI_endian_switch_inline.h
 *  \ingroup bli
 */

/* note: using a temp char to switch endian is a lot slower,
 * use bit shifting instead. */

/* *** 16 *** */
BLI_INLINE void BLI_endian_switch_int16(short *val)
{
	BLI_endian_switch_uint16((unsigned short *)val);
}
BLI_INLINE void BLI_endian_switch_uint16(unsigned short *val)
{
#if (defined(__GNUC__) && ((__GNUC__ * 100 + __GNUC_MINOR__) >= 408))  /* gcc4.8+ only */
	*val = __builtin_bswap16(*val);
#else
	unsigned short tval = *val;
	*val = (tval >> 8) |
	       (tval << 8);
#endif
}


/* *** 32 *** */
BLI_INLINE void BLI_endian_switch_int32(int *val)
{
	BLI_endian_switch_uint32((unsigned int *)val);
}
BLI_INLINE void BLI_endian_switch_uint32(unsigned int *val)
{
#ifdef __GNUC__
	*val = __builtin_bswap32(*val);
#else
	unsigned int tval = *val;
	*val = ((tval >> 24))             |
	       ((tval << 8) & 0x00ff0000) |
	       ((tval >> 8) & 0x0000ff00) |
	       ((tval << 24));
#endif
}
BLI_INLINE void BLI_endian_switch_float(float *val)
{
	BLI_endian_switch_uint32((unsigned int *)val);
}


/* *** 64 *** */
BLI_INLINE void BLI_endian_switch_int64(int64_t *val)
{
	BLI_endian_switch_uint64((uint64_t *)val);
}
BLI_INLINE void BLI_endian_switch_uint64(uint64_t *val)
{
#ifdef __GNUC__
	*val = __builtin_bswap64(*val);
#else
	uint64_t tval = *val;
	*val = ((tval >> 56)) |
	       ((tval << 40) & 0x00ff000000000000ll) |
	       ((tval << 24) & 0x0000ff0000000000ll) |
	       ((tval <<  8) & 0x000000ff00000000ll) |
	       ((tval >>  8) & 0x00000000ff000000ll) |
	       ((tval >> 24) & 0x0000000000ff0000ll) |
	       ((tval >> 40) & 0x000000000000ff00ll) |
	       ((tval << 56));
#endif
}
BLI_INLINE void BLI_endian_switch_double(double *val)
{
	BLI_endian_switch_uint64((uint64_t *)val);
}

#endif  /* __BLI_ENDIAN_SWITCH_INLINE_H__ */