amxmodx/dlls/mysqlx/handles.cpp

#include <string.h>
#include "sh_stack.h"
#include "CVector.h"
#include "mysql2_header.h"

struct QHandle
{
	void *_ptr;
	FREEHANDLE _func;
	HandleType type;
	bool isfree;
};

CVector<QHandle *> g_Handles;
CStack<unsigned int> g_FreeHandles;

unsigned int MakeHandle(void *ptr, HandleType type, FREEHANDLE f)
{
	unsigned int num;
	QHandle *h;

	if (g_FreeHandles.size())
	{
		num = g_FreeHandles.front();
		g_FreeHandles.pop();
		h = g_Handles[num];
	} else {
		h = new QHandle;
		g_Handles.push_back(h);
		num = static_cast<unsigned int>(g_Handles.size()) - 1;
	}

	h->_ptr = ptr;
	h->type = type;
	h->_func = f;
	h->isfree = false;

	return num + 1;
}

void *GetHandle(unsigned int num, HandleType type)
{
	if (num == 0)
		return NULL;

	num--;
	if (num >= g_Handles.size())
		return NULL;

	QHandle *h = g_Handles[num];
	if (h->isfree || (h->type != type))
		return NULL;

	return h->_ptr;
}

bool FreeHandle(unsigned int num)
{
	if (num == 0)
		return false;

	unsigned int _num = num;

	num--;
	if (num >= g_Handles.size())
		return false;

	QHandle *h = g_Handles[num];
	if (h->isfree)
		return false;

	h->_func(h->_ptr, _num);
	h->_ptr = NULL;
	h->_func = NULL;
	h->isfree = true;
	
	g_FreeHandles.push(num);

	return true;
}