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version 3.2

/*************************************************************************
* (C) 2013 AITNET ltd - Sofia/Bulgaria - <misho@aitnet.org>
*  by Michael Pounov <misho@elwix.org>
*
* $Author: misho $
* $Id: pack.c,v 1.6 2014/02/11 01:06:21 misho Exp $
*
**************************************************************************
The ELWIX and AITNET software is distributed under the following
terms:

All of the documentation and software included in the ELWIX and AITNET
Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>

Copyright 2004 - 2014
	by Michael Pounov <misho@elwix.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.
3. All advertising materials mentioning features or use of this software
   must display the following acknowledgement:
This product includes software developed by Michael Pounov <misho@elwix.org>
ELWIX - Embedded LightWeight unIX and its contributors.
4. Neither the name of AITNET nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY AITNET 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 REGENTS 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.
*/
#include "global.h"


static inline uint8_t *
rpack_next_boundary(uint8_t * __restrict buf, uint8_t * __restrict p, size_t align)
{
	size_t misa = (size_t) (p - buf) % align;

	if (!misa)
		return p;

	return p + (align - misa);
}


/*
 * rpack_create() - Allocate & init raw packet structure
 *
 * @buf = buffer
 * @buflen = length of buffer
 * return: NULL error or !=NULL raw packet, should be freed by rpack_destroy()
 */
rpack_t *
rpack_create(void * __restrict buf, size_t buflen)
{
	rpack_t *rp = NULL;

	rp = e_malloc(sizeof(rpack_t));
	if (!rp) {
		LOGERR;
		return NULL;
	}

	RPACK_INIT(rp, buf, buflen);
	return rp;
}

/*
 * rpack_destroy() - Release & free raw packet structure
 *
 * @rp = raw packet
 * return: none
 */
void
rpack_destroy(rpack_t ** __restrict rp)
{
	if (!rp)
		return;

	if (*rp) {
		RPACK_FREE(*rp);
		e_free(*rp);
		*rp = NULL;
	}
}

/*
 * rpack_align_and_reserve() - Align & reserve space
 *
 * @rp = raw buffer
 * @siz = need size
 * return: NULL error or not enough space, !=NULL next position
 */
uint8_t *
rpack_align_and_reserve(rpack_t * __restrict rp, size_t siz)
{
	uint8_t *n;

	if (!RPACK_SANITY(rp))
		return NULL;

	n = rpack_next_boundary(rp->r_buf, rp->r_next, siz);
	/* too little space for siz */
	if (n - rp->r_buf + siz > rp->r_len)
		return NULL;

	return n;
}


/*
 * rpack_uint8() - Pack/Unpack 8bit value
 *
 * @rp = raw buffer
 * @n = set value if !=NULL
 * return: -1 error or get value
 */
uint8_t
rpack_uint8(rpack_t * __restrict rp, uint8_t * __restrict n)
{
	uint8_t u;

	if (!RPACK_SANITY(rp))
		return (uint8_t) -1;
	/* No space left */
	if ((size_t) (rp->r_next - rp->r_buf) >= rp->r_len)
		return (uint8_t) -1;

	u = *rp->r_next;
	if (n)
		*rp->r_next = *n;

	rp->r_next++;
	return u;
}

/*
 * rpack_uint16() - Pack/Unpack 16bit value
 *
 * @rp = raw buffer
 * @n = set value if !=NULL
 * @be = extract in big-endian
 * return: -1 error or get value
 */
uint16_t
rpack_uint16(rpack_t * __restrict rp, uint16_t * __restrict n, int be)
{
	uint16_t u;
	uint8_t *next;

	if (!RPACK_SANITY(rp))
		return (uint16_t) -1;
	/* No space left */
	if (!(next = rpack_align_and_reserve(rp, sizeof(uint16_t))))
		return (uint16_t) -1;

	u = be ? EXTRACT_BE_16(next) : EXTRACT_LE_16(next);
	if (n)
		RPACK_SET_16(next, n);

	rp->r_next = next + sizeof(uint16_t);
	return u;
}

/*
 * rpack_uint24() - Pack/Unpack 24bit value
 *
 * @rp = raw buffer
 * @n = set value if !=NULL
 * @be = extract in big-endian
 * return: -1 error or get value
 */
uint32_t
rpack_uint24(rpack_t * __restrict rp, uint32_t * __restrict n, int be)
{
	uint32_t u;
	uint8_t *next;

	if (!RPACK_SANITY(rp))
		return (uint32_t) -1;
	/* No space left */
	if (!(next = rpack_align_and_reserve(rp, sizeof(uint32_t))))
		return (uint32_t) -1;

	u = be ? EXTRACT_BE_24(next) : EXTRACT_LE_24(next);
	if (n)
		RPACK_SET_24(next, n);

	rp->r_next = next + sizeof(uint32_t);
	return u;
}

/*
 * rpack_uint32() - Pack/Unpack 32bit value
 *
 * @rp = raw buffer
 * @n = set value if !=NULL
 * @be = extract in big-endian
 * return: -1 error or get value
 */
uint32_t
rpack_uint32(rpack_t * __restrict rp, uint32_t * __restrict n, int be)
{
	uint32_t u;
	uint8_t *next;

	if (!RPACK_SANITY(rp))
		return (uint32_t) -1;
	/* No space left */
	if (!(next = rpack_align_and_reserve(rp, sizeof(uint32_t))))
		return (uint32_t) -1;

	u = be ? EXTRACT_BE_32(next) : EXTRACT_LE_32(next);
	if (n)
		RPACK_SET_32(next, n);

	rp->r_next = next + sizeof(uint32_t);
	return u;
}

/*
 * rpack_uint64() - Pack/Unpack 64bit value
 *
 * @rp = raw buffer
 * @n = set value if !=NULL
 * @be = extract in big-endian
 * return: -1 error or get value
 */
uint64_t
rpack_uint64(rpack_t * __restrict rp, uint64_t * __restrict n, int be)
{
	uint64_t u;
	uint8_t *next;

	if (!RPACK_SANITY(rp))
		return (uint64_t) -1;
	/* No space left */
	if (!(next = rpack_align_and_reserve(rp, sizeof(uint64_t))))
		return (uint64_t) -1;

	u = be ? EXTRACT_BE_64(next) : EXTRACT_LE_64(next);
	if (n)
		RPACK_SET_64(next, n);

	rp->r_next = next + sizeof(uint64_t);
	return u;
}

/*
 * rpack_data() - Pack/Unpack align data
 *
 * @rp = raw buffer
 * @dat = data
 * @datlen = data length
 * return: NULL error or != NULL get data, must be e_free() after use!
 */
void *
rpack_data(rpack_t * __restrict rp, void * __restrict dat, size_t datlen)
{
	void *buf = NULL;
	uint8_t *next;

	if (!datlen || !RPACK_SANITY(rp))
		return NULL;
	buf = e_malloc(datlen);
	if (!buf)
		return NULL;
	/* No space left */
	if (!(next = rpack_align_and_reserve(rp, datlen))) {
		e_free(buf);
		return NULL;
	}

	memcpy(buf, next, datlen);
	if (dat)
		memcpy(next, dat, datlen);

	rp->r_next = next + datlen;
	return buf;
}

/*
 * rpack_rdata() - Pack/Unpack raw data
 *
 * @rp = raw buffer
 * @dat = data
 * @datlen = data length
 * return: NULL error or != NULL get data, must be e_free() after use!
 */
void *
rpack_rdata(rpack_t * __restrict rp, void * __restrict dat, size_t datlen)
{
	void *buf = NULL;

	if (!datlen || !RPACK_SANITY(rp))
		return NULL;
	buf = e_malloc(datlen);
	if (!buf)
		return NULL;
	/* No space left */
	if (datlen + rp->r_next - rp->r_buf > rp->r_len) {
		e_free(buf);
		return NULL;
	}

	memcpy(buf, rp->r_next, datlen);
	if (dat)
		memcpy(rp->r_next, dat, datlen);

	rp->r_next += datlen;
	return buf;
}

/*
 * rpack_ruint16() - Pack/Unpack raw 16bit value
 *
 * @rp = raw buffer
 * @n = set value if !=NULL
 * @be = extract in big-endian
 * return: -1 error or get value
 */
uint16_t
rpack_ruint16(rpack_t * __restrict rp, uint16_t * __restrict n, int be)
{
	uint16_t u;

	if (!RPACK_SANITY(rp))
		return (uint16_t) -1;
	/* No space left */
	if (sizeof(uint16_t) + rp->r_next - rp->r_buf > rp->r_len)
		return (uint16_t) -1;

	u = be ? EXTRACT_BE_16(rp->r_next) : EXTRACT_LE_16(rp->r_next);
	if (n)
		RPACK_SET_16(rp->r_next, n);

	rp->r_next += sizeof(uint16_t);
	return u;
}

/*
 * rpack_ruint24() - Pack/Unpack raw 24bit value
 *
 * @rp = raw buffer
 * @n = set value if !=NULL
 * @be = extract in big-endian
 * return: -1 error or get value
 */
uint32_t
rpack_ruint24(rpack_t * __restrict rp, uint32_t * __restrict n, int be)
{
	uint32_t u;

	if (!RPACK_SANITY(rp))
		return (uint32_t) -1;
	/* No space left */
	if (sizeof(uint32_t) + rp->r_next - rp->r_buf > rp->r_len)
		return (uint32_t) -1;

	u = be ? EXTRACT_BE_24(rp->r_next) : EXTRACT_LE_24(rp->r_next);
	if (n)
		RPACK_SET_24(rp->r_next, n);

	rp->r_next += sizeof(uint32_t);
	return u;
}

/*
 * rpack_ruint32() - Pack/Unpack raw 32bit value
 *
 * @rp = raw buffer
 * @n = set value if !=NULL
 * @be = extract in big-endian
 * return: -1 error or get value
 */
uint32_t
rpack_ruint32(rpack_t * __restrict rp, uint32_t * __restrict n, int be)
{
	uint32_t u;

	if (!RPACK_SANITY(rp))
		return (uint32_t) -1;
	/* No space left */
	if (sizeof(uint32_t) + rp->r_next - rp->r_buf > rp->r_len)
		return (uint32_t) -1;

	u = be ? EXTRACT_BE_32(rp->r_next) : EXTRACT_LE_32(rp->r_next);
	if (n)
		RPACK_SET_32(rp->r_next, n);

	rp->r_next += sizeof(uint32_t);
	return u;
}

/*
 * rpack_ruint64() - Pack/Unpack raw 64bit value
 *
 * @rp = raw buffer
 * @n = set value if !=NULL
 * @be = extract in big-endian
 * return: -1 error or get value
 */
uint64_t
rpack_ruint64(rpack_t * __restrict rp, uint64_t * __restrict n, int be)
{
	uint64_t u;

	if (!RPACK_SANITY(rp))
		return (uint64_t) -1;
	/* No space left */
	if (sizeof(uint64_t) + rp->r_next - rp->r_buf > rp->r_len)
		return (uint64_t) -1;

	u = be ? EXTRACT_BE_64(rp->r_next) : EXTRACT_LE_64(rp->r_next);
	if (n)
		RPACK_SET_64(rp->r_next, n);

	rp->r_next += sizeof(uint64_t);
	return u;
}