sysendian.h

/*-
 * Copyright 2007-2014 Colin Percival
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef _SYSENDIAN_H_
#define _SYSENDIAN_H_

#include <stdint.h>

/* Avoid namespace collisions with BSD <sys/endian.h>. */
#define be32dec libcperciva_be32dec
#define be32enc libcperciva_be32enc
#define be64enc libcperciva_be64enc
#define le32dec libcperciva_le32dec
#define le32enc libcperciva_le32enc

static inline uint32_t
be32dec(const void * pp)
{
	const uint8_t * p = (uint8_t const *)pp;

	return ((uint32_t)(p[3]) + ((uint32_t)(p[2]) << 8) +
	    ((uint32_t)(p[1]) << 16) + ((uint32_t)(p[0]) << 24));
}

static inline void
be32enc(void * pp, uint32_t x)
{
	uint8_t * p = (uint8_t *)pp;

	p[3] = x & 0xff;
	p[2] = (x >> 8) & 0xff;
	p[1] = (x >> 16) & 0xff;
	p[0] = (x >> 24) & 0xff;
}

static inline void
be64enc(void * pp, uint64_t x)
{
	uint8_t * p = (uint8_t *)pp;

	p[7] = x & 0xff;
	p[6] = (x >> 8) & 0xff;
	p[5] = (x >> 16) & 0xff;
	p[4] = (x >> 24) & 0xff;
	p[3] = (x >> 32) & 0xff;
	p[2] = (x >> 40) & 0xff;
	p[1] = (x >> 48) & 0xff;
	p[0] = (x >> 56) & 0xff;
}

static inline uint32_t
le32dec(const void * pp)
{
	const uint8_t * p = (uint8_t const *)pp;

	return ((uint32_t)(p[0]) + ((uint32_t)(p[1]) << 8) +
	    ((uint32_t)(p[2]) << 16) + ((uint32_t)(p[3]) << 24));
}

static inline void
le32enc(void * pp, uint32_t x)
{
	uint8_t * p = (uint8_t *)pp;

	p[0] = x & 0xff;
	p[1] = (x >> 8) & 0xff;
	p[2] = (x >> 16) & 0xff;
	p[3] = (x >> 24) & 0xff;
}

#endif /* !_SYSENDIAN_H_ */