erlscrypt

/*-
 * Copyright 2007-2009 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.
 *
 * This file was originally written by Colin Percival as part of the Tarsnap
 * online backup system.
 */
#ifndef _SYSENDIAN_H_
#define _SYSENDIAN_H_

#include <stdint.h>

#ifdef USE_MACRO

#define be32dec(p) \
	((uint32_t)((p)[3]) + ((uint32_t)((p)[2]) << 8) +\
     ((uint32_t)((p)[1]) << 16) + ((uint32_t)((p)[0]) << 24))

#define be32enc(p, x) \
{\
    (p)[3] = (x) & 0xff;\
	(p)[2] = ((x) >> 8) & 0xff;\
	(p)[1] = ((x) >> 16) & 0xff;\
	(p)[0] = ((x) >> 24) & 0xff;\
}

#define be64dec(p) \
    (((uint64_t)((p)[7])        + ((uint64_t)((p)[6]) << 8)  +\
     ((uint64_t)((p)[5]) << 16) + ((uint64_t)((p)[4]) << 24) +\
     ((uint64_t)((p)[3]) << 32) + ((uint64_t)((p)[2]) << 40) +\
     ((uint64_t)((p)[1]) << 48) + ((uint64_t)((p)[0]) << 56))

#define be64enc(p, x)\
{\
	(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;\
}

#define le32dec(p)\
    ((uint32_t)((p)[0])        + ((uint32_t)((p)[1]) << 8) +\
    ((uint32_t)((p)[2]) << 16) + ((uint32_t)((p)[3]) << 24))

#define le32enc(p, x)\
{\
	(p)[0] =  (x)        & 0xff;\
	(p)[1] = ((x) >>  8) & 0xff;\
	(p)[2] = ((x) >> 16) & 0xff;\
	(p)[3] = ((x) >> 24) & 0xff;\
}

#define le64dec(p)\
    ((uint64_t)((p)[0])        + ((uint64_t)((p)[1]) <<  8) +\
    ((uint64_t)((p)[2]) << 16) + ((uint64_t)((p)[3]) << 24) +\
    ((uint64_t)((p)[4]) << 32) + ((uint64_t)((p)[5]) << 40) +\
    ((uint64_t)((p)[6]) << 48) + ((uint64_t)((p)[7]) << 56))

#define le64enc(p, x)\
{\
	(p)[0] =  (x)        & 0xff;\
	(p)[1] = ((x) >>  8) & 0xff;\
	(p)[2] = ((x) >> 16) & 0xff;\
	(p)[3] = ((x) >> 24) & 0xff;\
	(p)[4] = ((x) >> 32) & 0xff;\
	(p)[5] = ((x) >> 40) & 0xff;\
	(p)[6] = ((x) >> 48) & 0xff;\
	(p)[7] = ((x) >> 56) & 0xff;\
}

#else /* use inline */

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 uint64_t
be64dec(const void *pp)
{
	const uint8_t *p = (uint8_t const *)pp;

	return ((uint64_t)(p[7]) + ((uint64_t)(p[6]) << 8) +
	    ((uint64_t)(p[5]) << 16) + ((uint64_t)(p[4]) << 24) +
	    ((uint64_t)(p[3]) << 32) + ((uint64_t)(p[2]) << 40) +
	    ((uint64_t)(p[1]) << 48) + ((uint64_t)(p[0]) << 56));
}

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;
}

static inline uint64_t
le64dec(const void *pp)
{
	const uint8_t *p = (uint8_t const *)pp;

	return ((uint64_t)(p[0]) + ((uint64_t)(p[1]) << 8) +
	    ((uint64_t)(p[2]) << 16) + ((uint64_t)(p[3]) << 24) +
	    ((uint64_t)(p[4]) << 32) + ((uint64_t)(p[5]) << 40) +
	    ((uint64_t)(p[6]) << 48) + ((uint64_t)(p[7]) << 56));
}

static inline void
le64enc(void *pp, uint64_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;
	p[4] = (x >> 32) & 0xff;
	p[5] = (x >> 40) & 0xff;
	p[6] = (x >> 48) & 0xff;
	p[7] = (x >> 56) & 0xff;
}

#endif /* USE_MACRO */

#endif /* !_SYSENDIAN_H_ */