/* Ham Sandwich
 *   Copyright 2007
 *   By the AMX Mod X Development Team
 *
 *  Ham Sandwich is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by the
 *  Free Software Foundation; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  Ham Sandwich is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with Ham Sandwich; if not, write to the Free Software Foundation,
 *  Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 *  In addition, as a special exception, the author gives permission to
 *  link the code of Ham Sandwich with the Half-Life Game Engine ("HL
 *  Engine") and Modified Game Libraries ("MODs") developed by Valve,
 *  L.L.C ("Valve"). You must obey the GNU General Public License in all
 *  respects for all of the code used other than the HL Engine and MODs
 *  from Valve. If you modify this file, you may extend this exception
 *  to your version of the file, but you are not obligated to do so. If
 *  you do not wish to do so, delete this exception statement from your
 *  version.
 */
#include "amxxmodule.h"
#include "offsets.h"
#include "NEW_Util.h"
#include "ham_utils.h"

#define FM_CHECK_ENTITY(x) \
	if (x < 0 || x > gpGlobals->maxEntities) { \
		MF_LogError(amx, AMX_ERR_NATIVE, "Entity out of range (%d)", x); \
		return 0; \
	} else { \
		if (x <= gpGlobals->maxClients) { \
			if (!MF_IsPlayerIngame(x)) { \
				MF_LogError(amx, AMX_ERR_NATIVE, "Invalid player %d (not in-game)", x); \
				return 0; \
			} \
		} else { \
			if (x != 0 && FNullEnt(INDEXENT(x))) { \
				MF_LogError(amx, AMX_ERR_NATIVE, "Invalid entity %d", x); \
				return 0; \
			} \
		} \
	}

// Return -1 on null, -2 on invalid, and the the index of any other.
static cell AMX_NATIVE_CALL get_pdata_cbase_safe(AMX *amx, cell *params)
{
	int index=params[1];
	FM_CHECK_ENTITY(index);
	int iOffset=params[2];
#ifdef __linux__
	iOffset += params[3];
#elif defined __APPLE__
	// Use Linux offset in older plugins
	if (params[0] / sizeof(cell) == 3)
		iOffset += params[3];
	else
		iOffset += params[4];
#endif
	if (iOffset <0)
	{
		MF_LogError(amx, AMX_ERR_NATIVE, "Invalid offset provided. (got: %d)", iOffset);
		return 0;
	}
	void *ptr=*((void **)((int *)INDEXENT_NEW(index)->pvPrivateData + iOffset));

	if (ptr == 0)
	{
		return -1;
	}

	for (int i=0; i<gpGlobals->maxEntities; ++i)
	{
		if (ptr == INDEXENT_NEW(i)->pvPrivateData)
		{
			return i;
		}
	}

	return -2;
}
static cell AMX_NATIVE_CALL get_pdata_cbase(AMX *amx, cell *params)
{
	int index=params[1];
	FM_CHECK_ENTITY(index);
	int iOffset=params[2];
#ifdef __linux__
	iOffset += params[3];
#elif defined __APPLE__
	// Use Linux offset in older plugins
	if (params[0] / sizeof(cell) == 3)
		iOffset += params[3];
	else
		iOffset += params[4];
#endif

	if (iOffset <0)
	{
		MF_LogError(amx, AMX_ERR_NATIVE, "Invalid offset provided. (got: %d)", iOffset);
		return 0;
	}
	void *ptr=*((void **)((int *)INDEXENT_NEW(index)->pvPrivateData + iOffset));

	return PrivateToIndex(ptr);
}
static cell AMX_NATIVE_CALL set_pdata_cbase(AMX *amx, cell *params)
{
	int index=params[1];
	FM_CHECK_ENTITY(index);
	int target=params[3];

	if (target != -1)
	{
		FM_CHECK_ENTITY(target);
	}
	int iOffset=params[2];
#ifdef __linux__
	iOffset += params[4];
#elif defined __APPLE__
	// Use Linux offset in older plugins
	if (params[0] / sizeof(cell) == 4)
		iOffset += params[4];
	else
		iOffset += params[5];
#endif
	if (iOffset <0)
	{
		MF_LogError(amx, AMX_ERR_NATIVE, "Invalid offset provided. (got: %d)", iOffset);
		return 0;
	}

	if (target == -1)
	{
		*((void **)((int *)INDEXENT_NEW(index)->pvPrivateData + iOffset)) = NULL;
	}
	else
	{
		*((void **)((int *)INDEXENT_NEW(index)->pvPrivateData + iOffset)) = INDEXENT_NEW(target)->pvPrivateData;
	}

	return 1;
}

AMX_NATIVE_INFO pdata_natives_safe[] =
{
	{ "get_pdata_cbase_safe",	get_pdata_cbase_safe },

	{ NULL,						NULL }
};
AMX_NATIVE_INFO pdata_natives[] =
{
	{ "get_pdata_cbase",		get_pdata_cbase },
	{ "set_pdata_cbase",		set_pdata_cbase },

	{ NULL,						NULL }
};