/*-

 * Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org>

 * 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.

 *

 * $FreeBSD: head/lib/libarchive/archive_endian.h 201085 2009-12-28 02:17:15Z kientzle $

 *

 * Borrowed from FreeBSD's <sys/endian.h>

 */

#ifndef __LIBARCHIVE_BUILD

#error This header is only to be used internally to libarchive.

#endif

/* Note:  This is a purely internal header! */

/* Do not use this outside of libarchive internal code! */

#ifndef ARCHIVE_ENDIAN_H_INCLUDED

#define ARCHIVE_ENDIAN_H_INCLUDED

/*

 * Disabling inline keyword for compilers known to choke on it:

 * - Watcom C++ in C code.  (For any version?)

 * - SGI MIPSpro

 * - Microsoft Visual C++ 6.0 (supposedly newer versions too)

 * - IBM VisualAge 6 (XL v6)

 * - Sun WorkShop C (SunPro) before 5.9

 */

#if defined(__WATCOMC__) || defined(__sgi) || defined(__hpux) || defined(__BORLANDC__)

#define	inline

#elif defined(__IBMC__) && __IBMC__ < 700

#define	inline

#elif defined(__SUNPRO_C) && __SUNPRO_C < 0x590

#define inline

#elif defined(_MSC_VER) || defined(__osf__)

#define inline __inline

#endif

/* Alignment-agnostic encode/decode bytestream to/from little/big endian. */

static inline uint16_t

archive_be16dec(const void *pp)

{

	unsigned char const *p = (unsigned char const *)pp;

	/* Store into unsigned temporaries before left shifting, to avoid

	promotion to signed int and then left shifting into the sign bit,

	which is undefined behaviour. */

	unsigned int p1 = p[1];

	unsigned int p0 = p[0];

	return ((p0 << 8) | p1);

}

static inline uint32_t

archive_be32dec(const void *pp)

{

	unsigned char const *p = (unsigned char const *)pp;

	/* Store into unsigned temporaries before left shifting, to avoid

	promotion to signed int and then left shifting into the sign bit,

	which is undefined behaviour. */

	unsigned int p3 = p[3];

	unsigned int p2 = p[2];

	unsigned int p1 = p[1];

	unsigned int p0 = p[0];

	return ((p0 << 24) | (p1 << 16) | (p2 << 8) | p3);

}

static inline uint64_t

archive_be64dec(const void *pp)

{

	unsigned char const *p = (unsigned char const *)pp;

	return (((uint64_t)archive_be32dec(p) << 32) | archive_be32dec(p + 4));

}

static inline uint16_t

archive_le16dec(const void *pp)

{

	unsigned char const *p = (unsigned char const *)pp;

	/* Store into unsigned temporaries before left shifting, to avoid

	promotion to signed int and then left shifting into the sign bit,

	which is undefined behaviour. */

	unsigned int p1 = p[1];

	unsigned int p0 = p[0];

	return ((p1 << 8) | p0);

}

static inline uint32_t

archive_le32dec(const void *pp)

{

	unsigned char const *p = (unsigned char const *)pp;

	/* Store into unsigned temporaries before left shifting, to avoid

	promotion to signed int and then left shifting into the sign bit,

	which is undefined behaviour. */

	unsigned int p3 = p[3];

	unsigned int p2 = p[2];

	unsigned int p1 = p[1];

	unsigned int p0 = p[0];

	return ((p3 << 24) | (p2 << 16) | (p1 << 8) | p0);

}

static inline uint64_t

archive_le64dec(const void *pp)

{

	unsigned char const *p = (unsigned char const *)pp;

	return (((uint64_t)archive_le32dec(p + 4) << 32) | archive_le32dec(p));

}

static inline void

archive_be16enc(void *pp, uint16_t u)

{

	unsigned char *p = (unsigned char *)pp;

	p[0] = (u >> 8) & 0xff;

	p[1] = u & 0xff;

}

static inline void

archive_be32enc(void *pp, uint32_t u)

{

	unsigned char *p = (unsigned char *)pp;

	p[0] = (u >> 24) & 0xff;

	p[1] = (u >> 16) & 0xff;

	p[2] = (u >> 8) & 0xff;

	p[3] = u & 0xff;

}

static inline void

archive_be64enc(void *pp, uint64_t u)

{

	unsigned char *p = (unsigned char *)pp;

	archive_be32enc(p, (uint32_t)(u >> 32));

	archive_be32enc(p + 4, (uint32_t)(u & 0xffffffff));

}

static inline void

archive_le16enc(void *pp, uint16_t u)

{

	unsigned char *p = (unsigned char *)pp;

	p[0] = u & 0xff;

	p[1] = (u >> 8) & 0xff;

}

static inline void

archive_le32enc(void *pp, uint32_t u)

{

	unsigned char *p = (unsigned char *)pp;

	p[0] = u & 0xff;

	p[1] = (u >> 8) & 0xff;

	p[2] = (u >> 16) & 0xff;

	p[3] = (u >> 24) & 0xff;

}

static inline void

archive_le64enc(void *pp, uint64_t u)

{

	unsigned char *p = (unsigned char *)pp;

	archive_le32enc(p, (uint32_t)(u & 0xffffffff));

	archive_le32enc(p + 4, (uint32_t)(u >> 32));

}

#endif