eqemu-server/common/misc_functions.cpp

/*	EQEmu: EQEmulator

	Copyright (C) 2001-2026 EQEmu Development Team

	This program 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 3 of the License, or
	(at your option) any later version.

	This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "misc_functions.h"

#include "common/platform/inet.h"
#include "common/platform/platform.h"
#include "common/seperator.h"
#include "common/strings.h"
#include "common/timer.h"
#include "common/types.h"

#include <ctime>

#ifndef _WINDOWS
#include <sys/stat.h>
#include <netdb.h>
#endif

uint32 ResolveIP(const char* hostname, char* errbuf) {
#ifdef _WINDOWS
	static InitWinsock ws;
#endif
	if (errbuf)
		errbuf[0] = 0;
	if (hostname == 0) {
		if (errbuf)
			snprintf(errbuf, ERRBUF_SIZE, "ResolveIP(): hostname == 0");
		return 0;
	}
	struct sockaddr_in	server_sin;
#ifdef _WINDOWS
	PHOSTENT phostent = nullptr;
#else
	struct hostent *phostent = nullptr;
#endif
	server_sin.sin_family = AF_INET;
	if ((phostent = gethostbyname(hostname)) == nullptr) {
#ifdef _WINDOWS
		if (errbuf)
			snprintf(errbuf, ERRBUF_SIZE, "Unable to get the host name. Error: %i", WSAGetLastError());
#else
		if (errbuf)
			snprintf(errbuf, ERRBUF_SIZE, "Unable to get the host name. Error: %s", strerror(errno));
#endif
		return 0;
	}
#ifdef _WINDOWS
	memcpy ((char FAR *)&(server_sin.sin_addr), phostent->h_addr, phostent->h_length);
#else
	memcpy ((char*)&(server_sin.sin_addr), phostent->h_addr, phostent->h_length);
#endif
	return server_sin.sin_addr.s_addr;
}

bool ParseAddress(const char* iAddress, uint32* oIP, uint16* oPort, char* errbuf) {
	Seperator sep(iAddress, ':', 2, 250, false, 0, 0);
	if (sep.argnum == 1 && sep.IsNumber(1)) {
		*oIP = ResolveIP(sep.arg[0], errbuf);
		if (*oIP == 0)
			return false;
		if (oPort)
			*oPort = Strings::ToUnsignedInt(sep.arg[1]);
		return true;
	}
	return false;
}

#ifdef _WINDOWS
InitWinsock::InitWinsock() {
	WORD version = MAKEWORD (1,1);
	WSADATA wsadata;
	WSAStartup (version, &wsadata);
}

InitWinsock::~InitWinsock() {
	WSACleanup();
}
#endif


const char * itoa(int num) {
		static char temp[_ITOA_BUFLEN];
		memset(temp,0,_ITOA_BUFLEN);
		snprintf(temp,_ITOA_BUFLEN,"%d",num);
		return temp;
}

#ifndef WIN32
const char * itoa(int num, char* a,int b) {
		static char temp[_ITOA_BUFLEN];
		memset(temp,0,_ITOA_BUFLEN);
		snprintf(temp,_ITOA_BUFLEN,"%d",num);
		return temp;
		return temp;
}
#endif

uint32 rnd_hash( time_t t, clock_t c )
{
	// Get a uint32 from t and c
	// Better than uint32(x) in case x is floating point in [0,1]
	// Based on code by Lawrence Kirby (fred@genesis.demon.co.uk)

	static uint32 differ = 0; // guarantee time-based seeds will change

	uint32 h1 = 0;
	unsigned char *p = (unsigned char *) &t;
	for( size_t i = 0; i < sizeof(t); ++i )
	{
		h1 *= 255 + 2U;
		h1 += p[i];
	}
	uint32 h2 = 0;
	p = (unsigned char *) &c;
	for( size_t j = 0; j < sizeof(c); ++j )
	{
		h2 *= 255 + 2U;
		h2 += p[j];
	}
	return ( h1 + differ++ ) ^ h2;
}

float EQ13toFloat(int d)
{
	return static_cast<float>(d) / 64.0f;
}

float EQ19toFloat(int d)
{
	return static_cast<float>(d) / 8.0f;
}

int FloatToEQ13(float d)
{
	return static_cast<int>(d * 64.0f);
}

int FloatToEQ19(float d)
{
	return static_cast<int>(d * 8.0f);
}

float EQ12toFloat(int d)
{
	return static_cast<float>(d) / 4.0f;
}

int FloatToEQ12(float d)
{
	return static_cast<int>((d + 2048.0f) * 4.0f) % 2048;
}

float EQ10toFloat(int d)
{
	return static_cast<float>(d) / 20.0f;
}

int FloatToEQ10(float d)
{
	return static_cast<int>(d * 20.0f);
}

float EQSpeedRunToFloat(int d)
{
	return static_cast<float>(d) / 40.0f;
}

int FloatToEQSpeedRun(float d)
{
	return static_cast<int>(d * 40.0f);
}

float FixHeading(float in)
{
	int i = 0;
	if (in >= 512.0f) {
		do {
			in -= 512.0f;
		} while (in >= 512.0f && i++ <= 5);
	}
	i = 0;
	if (in < 0.0f) {
		do {
			in += 512.0f;
		} while (in < 0.0f && i++ <= 5);
	}

	return in;
}

/*
	Heading of 0 points in the pure positive Y direction

*/
int FloatToEQH(float d)
{
	return(int((360.0f - d) * float(1<<11)) / 360);
}

float EQHtoFloat(int d)
{
	return(360.0f - float((d * 360) >> 11));
}

// returns a swapped-bit value for use in client translator and inventory functions
uint32 SwapBits21And22(uint32 mask)
{
	static const uint32 BIT21 = 1 << 21;
	static const uint32 BIT22 = 1 << 22;
	static const uint32 SWAPBITS = (BIT21 | BIT22);

	if ((bool)(mask & BIT21) != (bool)(mask & BIT22))
		mask ^= SWAPBITS;

	return mask;
}

// returns an unset bit 22 value for use in client translators
uint32 Catch22(uint32 mask)
{
	static const uint32 KEEPBITS = ~(1 << 22);

	mask &= KEEPBITS;

	return mask;
}