<?php
declare(strict_types=1);
/**
* phpMyAdmin ShapeFile library
* <https://github.com/phpmyadmin/shapefile/>.
*
* Copyright 2006-2007 Ovidio <ovidio AT users.sourceforge.net>
* Copyright 2016 - 2017 Michal Čihař <michal@cihar.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.
*
* 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, you can download one from
* https://www.gnu.org/copyleft/gpl.html.
*/
namespace PhpMyAdmin\ShapeFile;
use function current;
use function pack;
use function sprintf;
use function strlen;
use function unpack;
class Util
{
/** @var bool|null */
private static $littleEndian = null;
/** @var array */
private static $shapeNames = [
0 => 'Null Shape',
1 => 'Point',
3 => 'PolyLine',
5 => 'Polygon',
8 => 'MultiPoint',
11 => 'PointZ',
13 => 'PolyLineZ',
15 => 'PolygonZ',
18 => 'MultiPointZ',
21 => 'PointM',
23 => 'PolyLineM',
25 => 'PolygonM',
28 => 'MultiPointM',
31 => 'MultiPatch',
];
/**
* Reads data.
*
* @param string $type type for unpack()
* @param string|false $data Data to process
*
* @return mixed|false
*/
public static function loadData(string $type, $data)
{
if ($data === false) {
return false;
}
if (strlen($data) === 0) {
return false;
}
$tmp = unpack($type, $data);
return $tmp === false ? $tmp : current($tmp);
}
/**
* Changes endianity.
*
* @param string $binValue Binary value
*/
public static function swap(string $binValue): string
{
$result = $binValue[strlen($binValue) - 1];
for ($i = strlen($binValue) - 2; $i >= 0; --$i) {
$result .= $binValue[$i];
}
return $result;
}
/**
* Encodes double value to correct endianity.
*
* @param float $value Value to pack
*/
public static function packDouble(float $value): string
{
$bin = pack('d', (float) $value);
if (self::$littleEndian === null) {
self::$littleEndian = (pack('L', 1) === pack('V', 1));
}
if (self::$littleEndian) {
return $bin;
}
return self::swap($bin);
}
/**
* Returns shape name.
*/
public static function nameShape(int $type): string
{
if (isset(self::$shapeNames[$type])) {
return self::$shapeNames[$type];
}
return sprintf('Shape %d', $type);
}
}