/*************************************************************************
* (C) 2011 AITNET ltd - Sofia/Bulgaria - <misho@aitnet.org>
*  by Michael Pounov <misho@elwix.org>
*
* $Author: misho $
* $Id: vars.c,v 1.2 2011/10/31 13:53:51 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, 2005, 2006, 2007, 2008, 2009, 2010, 2011
	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"


/*
 * io_vals2buffer() Marshaling data from array with variables to buffer
 * @buf = Buffer
 * @buflen = Size of buffer
 * @vars = Variable array
 * return: -1 error, 0 nothing done or >0 size of marshaled data
 */
int
io_vals2buffer(u_char *buf, int buflen, array_t *vars)
{
	int Limit = 0;
	register int i;
	ait_val_t *v, *val;
	u_char *data;

	assert(buf);
	assert(vars);
	if (!buf || !vars)
		return -1;
	if (!buflen || !io_arraySize(vars))
		return 0;

	Limit = sizeof(ait_val_t) * io_arraySize(vars);
	if (Limit > buflen) {
		io_SetErr(EMSGSIZE, "Error:: too short buffer buflen=%d needed min %d ...\n", 
				buflen, Limit);
		return -1;
	} else {
		memset(buf, 0, buflen);

		v = (ait_val_t*) buf;
		data = buf + Limit;
	}

	/* marshaling */
	for (i = 0; i < io_arraySize(vars); i++) {
		val = io_array(vars, i, ait_val_t*);

		v[i].val_type = val->val_type;
		AIT_LEN(&v[i]) = htobe32(AIT_LEN(val));

		switch (AIT_TYPE(val)) {
			case blob:
			case f32:
			case f64:
			case i8:
			case i16:
			case i32:
			case i64:
			case u8:
			case u16:
			case u32:
			case u64:
				v[i].val.net = htobe64(val->val.net);
				break;
			case buffer:
			case string:
				if (AIT_LEN(val) > buflen - Limit) {
					io_SetErr(EMSGSIZE, "Error:: too short buffer buflen=%d "
							"needed min %d ...\n", buflen, Limit + AIT_LEN(val));
					return -1;
				} else
					Limit += AIT_LEN(val);

				memcpy(data, val->val.buffer, AIT_LEN(val));
				/* Debug:: data offset in packet, not matter for anything! */
				v[i].val.net = data - buf;
				data += AIT_LEN(val);
				break;
			default:
				io_SetErr(EINVAL, "Error:: unsupported variable type=%d at element #%d ...\n", 
						AIT_TYPE(val), i);
				return -1;
		}
	}

	return Limit;
}

/*
 * io_buffer2vals() De-marshaling data from buffer to array with variables
 * @buf = Buffer
 * @buflen = Size of buffer
 * @vnum = Number of variables into buffer
 * @zcpy = Zero-copy for variables, if !=0 don't use io_arrayFree() for free variables and 
 		*DON'T MODIFY OR DESTROY BUFFER*. =0 call io_arrayFree() before io_arrayDestroy()
 * return: =NULL error, !=NULL allocated variable array, after use must free with io_arrayDestroy()
 */
array_t *
io_buffer2vals(u_char *buf, int buflen, int vnum, int zcpy)
{
	array_t *vars;
	int Limit = 0;
	register int i;
	ait_val_t *v, *val;
	u_char *data;

	assert(buf);
	if (!buf || !buflen || !vnum)
		return NULL;

	Limit = sizeof(ait_val_t) * vnum;
	if (Limit > buflen) {
		io_SetErr(EMSGSIZE, "Error:: too short buffer buflen=%d needed min %d ...\n", 
				buflen, Limit);
		return NULL;
	} else {
		if (!(vars = io_arrayInit(vnum)))
			return NULL;

		v = (ait_val_t*) buf;
		data = buf + Limit;
	}

	/* de-marshaling */
	for (i = 0; i < io_arraySize(vars); i++) {
		if (!zcpy) {
			val = malloc(sizeof(ait_val_t));
			if (!val) {
				LOGERR;
				io_arrayFree(vars);
				io_arrayDestroy(&vars);
				return NULL;
			}
		} else
			val = v + i;
		io_arraySet(vars, i, val);

		val->val_type = v[i].val_type;
#if defined(__OpenBSD__)
		AIT_LEN(val) = betoh32(AIT_LEN(&v[i]));
#else
		AIT_LEN(val) = be32toh(AIT_LEN(&v[i]));
#endif

		switch (AIT_TYPE(val)) {
			case blob:
			case f32:
			case f64:
			case i8:
			case i16:
			case i32:
			case i64:
			case u8:
			case u16:
			case u32:
			case u64:
#if defined(__OpenBSD__)
				val->val.net = betoh64(v[i].val.net);
#else
				val->val.net = be64toh(v[i].val.net);
#endif
				break;
			case buffer:
			case string:
				if (AIT_LEN(val) > buflen - Limit) {
					io_SetErr(EMSGSIZE, "Error:: too short buffer buflen=%d "
							"needed min %d ...\n", buflen, Limit + AIT_LEN(val));
					if (!zcpy)
						io_arrayFree(vars);
					io_arrayDestroy(&vars);
					return NULL;
				} else
					Limit += AIT_LEN(val);

				if (!zcpy) {
					val->val.buffer = malloc(AIT_LEN(val));
					if (!val->val.buffer) {
						LOGERR;
						io_arrayFree(vars);
						io_arrayDestroy(&vars);
						return NULL;
					} else
						memcpy(val->val.buffer, data, AIT_LEN(val));
				} else
					val->val.buffer = data;
				data += AIT_LEN(val);
				break;
			default:
				io_SetErr(EINVAL, "Error:: unsupported variable type=%d at element #%d ...\n", 
						AIT_TYPE(val), i);
				if (!zcpy)
					io_arrayFree(vars);
				io_arrayDestroy(&vars);
				return NULL;
		}
	}

	return vars;
}

/* buffer marshaling without swapping bytes to network order */

/*
 * io_vals2map() Marshaling data from array with variables to memory map
 * @buf = Buffer
 * @buflen = Size of buffer
 * @vars = Variable array
 * return: -1 error, 0 nothing done or >0 size of marshaled data
 */
int
io_vals2map(u_char *buf, int buflen, array_t *vars)
{
	int Limit = 0;
	register int i;
	ait_val_t *v, *val;
	u_char *data;

	assert(buf);
	assert(vars);
	if (!buf || !vars)
		return -1;
	if (!buflen || !io_arraySize(vars))
		return 0;

	Limit = sizeof(ait_val_t) * io_arraySize(vars);
	if (Limit > buflen) {
		io_SetErr(EMSGSIZE, "Error:: too short buffer buflen=%d needed min %d ...\n", 
				buflen, Limit);
		return -1;
	} else {
		memset(buf, 0, buflen);

		v = (ait_val_t*) buf;
		data = buf + Limit;
	}

	/* marshaling */
	for (i = 0; i < io_arraySize(vars); i++) {
		val = io_array(vars, i, ait_val_t*);

		v[i].val_type = val->val_type;
		AIT_LEN(&v[i]) = AIT_LEN(val);

		switch (AIT_TYPE(val)) {
			case blob:
			case f32:
			case f64:
			case i8:
			case i16:
			case i32:
			case i64:
			case u8:
			case u16:
			case u32:
			case u64:
				v[i].val.net = val->val.net;
				break;
			case buffer:
			case string:
				if (AIT_LEN(val) > buflen - Limit) {
					io_SetErr(EMSGSIZE, "Error:: too short buffer buflen=%d "
							"needed min %d ...\n", buflen, Limit + AIT_LEN(val));
					return -1;
				} else
					Limit += AIT_LEN(val);

				memcpy(data, val->val.buffer, AIT_LEN(val));
				/* Debug:: data offset in packet, not matter for anything! */
				v[i].val.net = data - buf;
				data += AIT_LEN(val);
				break;
			default:
				io_SetErr(EINVAL, "Error:: unsupported variable type=%d at element #%d ...\n", 
						AIT_TYPE(val), i);
				return -1;
		}
	}

	return Limit;
}

/*
 * io_map2vals() De-marshaling data from memory map to array with variables
 * @buf = Buffer
 * @buflen = Size of buffer
 * @vnum = Number of variables into buffer
 * @zcpy = Zero-copy for variables, if !=0 don't use io_arrayFree() for free variables and 
 		*DON'T MODIFY OR DESTROY BUFFER*. =0 call io_arrayFree() before io_arrayDestroy()
 * return: =NULL error, !=NULL allocated variable array, after use must free with io_arrayDestroy()
 */
array_t *
io_map2vals(u_char *buf, int buflen, int vnum, int zcpy)
{
	array_t *vars;
	int Limit = 0;
	register int i;
	ait_val_t *v, *val;
	u_char *data;

	assert(buf);
	if (!buf || !buflen || !vnum)
		return NULL;

	Limit = sizeof(ait_val_t) * vnum;
	if (Limit > buflen) {
		io_SetErr(EMSGSIZE, "Error:: too short buffer buflen=%d needed min %d ...\n", 
				buflen, Limit);
		return NULL;
	} else {
		if (!(vars = io_arrayInit(vnum)))
			return NULL;

		v = (ait_val_t*) buf;
		data = buf + Limit;
	}

	/* de-marshaling */
	for (i = 0; i < io_arraySize(vars); i++) {
		if (!zcpy) {
			val = malloc(sizeof(ait_val_t));
			if (!val) {
				LOGERR;
				io_arrayFree(vars);
				io_arrayDestroy(&vars);
				return NULL;
			}
		} else
			val = v + i;
		io_arraySet(vars, i, val);

		val->val_type = v[i].val_type;
		AIT_LEN(val) = AIT_LEN(&v[i]);

		switch (AIT_TYPE(val)) {
			case blob:
			case f32:
			case f64:
			case i8:
			case i16:
			case i32:
			case i64:
			case u8:
			case u16:
			case u32:
			case u64:
				val->val.net = v[i].val.net;
				break;
			case buffer:
			case string:
				if (AIT_LEN(val) > buflen - Limit) {
					io_SetErr(EMSGSIZE, "Error:: too short buffer buflen=%d "
							"needed min %d ...\n", buflen, Limit + AIT_LEN(val));
					if (!zcpy)
						io_arrayFree(vars);
					io_arrayDestroy(&vars);
					return NULL;
				} else
					Limit += AIT_LEN(val);

				if (!zcpy) {
					val->val.buffer = malloc(AIT_LEN(val));
					if (!val->val.buffer) {
						LOGERR;
						io_arrayFree(vars);
						io_arrayDestroy(&vars);
						return NULL;
					} else
						memcpy(val->val.buffer, data, AIT_LEN(val));
				} else
					val->val.buffer = data;
				data += AIT_LEN(val);
				break;
			default:
				io_SetErr(EINVAL, "Error:: unsupported variable type=%d at element #%d ...\n", 
						AIT_TYPE(val), i);
				if (!zcpy)
					io_arrayFree(vars);
				io_arrayDestroy(&vars);
				return NULL;
		}
	}

	return vars;
}