patch.php

<?php
/*
		RPCS3.net Compatibility List (https://github.com/AniLeo/rpcs3-compatibility)
		Copyright (C) 2017 AniLeo
		https://github.com/AniLeo or ani-leo@outlook.com

		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 2 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, write to the Free Software Foundation, Inc.,
		51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

// Calls for the file that contains the functions needed
if (!@include_once('functions.php')) throw new Exception("Compat: functions.php is missing. Failed to include functions.php");
if (!@include_once(__DIR__."/objects/Game.php")) throw new Exception("Compat: Game.php is missing. Failed to include Game.php");


/*
API v1
Check for game patches

return_code
	-3 - Illegal search
	-2 - Maintenance mode
	-1 - No patches found for the specified version
	 0 - Newer patch found
	 1 - No newer patches found when hash is specified
*/

/**
* @return array<string, mixed> $results
*/
function exportGamePatches() : array
{
	global $c_maintenance, $get;

	if ($c_maintenance)
	{
		$results['return_code'] = -2;
		return $results;
	}

	if (!isset($get['v']))
	{
		$results['return_code'] = -3;
		return $results;
	}

	$db = getDatabase();
	$db_version = mysqli_real_escape_string($db, $get['v']);
	$patches = mysqli_query($db, "SELECT * FROM `game_patch`
	                              WHERE `version` = '{$db_version}'
	                              ORDER BY `wiki_id` ASC; ");
	mysqli_close($db);

	if (is_bool($patches) || mysqli_num_rows($patches) === 0)
	{
		$results['return_code'] = -1;
		return $results;
	}

	$results['return_code'] = 0;
	$results['version'] = $get['v'];
	$results['sha256'] = "";

	// Generate a valid patch file
	$results['patch'] = "Version: {$results['version']}\n";
	while ($row = mysqli_fetch_object($patches))
	{
		// This should be unreachable unless the database structure is damaged
		if (!property_exists($row, "patch"))
		{
			continue;
		}

		$results['patch'] .= "\n";
		$results['patch'] .= $row->patch;
		$results['patch'] .= "\n";
	}

	// Hash the returned results
	$results['sha256'] = hash('sha256', $results['patch']);

	if (isset($get['sha256']) && $results['sha256'] === strtolower($get['sha256']))
	{
		// Client hash matches match our patch, no new patch found
		unset($results['patch']);
		$results['return_code'] = 1;
	}

	return $results;
}