126 lines
3 KiB
PHP
126 lines
3 KiB
PHP
<?php
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declare(strict_types=1);
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/**
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* phpMyAdmin ShapeFile library
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* <https://github.com/phpmyadmin/shapefile/>.
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*
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* Copyright 2006-2007 Ovidio <ovidio AT users.sourceforge.net>
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* Copyright 2016 - 2017 Michal Čihař <michal@cihar.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you can download one from
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* https://www.gnu.org/copyleft/gpl.html.
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*/
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namespace PhpMyAdmin\ShapeFile;
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use function current;
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use function pack;
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use function sprintf;
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use function strlen;
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use function unpack;
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class Util
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{
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/** @var bool|null */
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private static $littleEndian = null;
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/** @var array */
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private static $shapeNames = [
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0 => 'Null Shape',
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1 => 'Point',
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3 => 'PolyLine',
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5 => 'Polygon',
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8 => 'MultiPoint',
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11 => 'PointZ',
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13 => 'PolyLineZ',
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15 => 'PolygonZ',
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18 => 'MultiPointZ',
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21 => 'PointM',
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23 => 'PolyLineM',
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25 => 'PolygonM',
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28 => 'MultiPointM',
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31 => 'MultiPatch',
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];
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/**
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* Reads data.
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*
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* @param string $type type for unpack()
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* @param string|false $data Data to process
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*
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* @return mixed|false
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*/
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public static function loadData(string $type, $data)
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{
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if ($data === false) {
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return false;
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}
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if (strlen($data) === 0) {
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return false;
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}
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$tmp = unpack($type, $data);
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return $tmp === false ? $tmp : current($tmp);
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}
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/**
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* Changes endianity.
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*
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* @param string $binValue Binary value
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*/
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public static function swap(string $binValue): string
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{
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$result = $binValue[strlen($binValue) - 1];
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for ($i = strlen($binValue) - 2; $i >= 0; --$i) {
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$result .= $binValue[$i];
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}
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return $result;
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}
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/**
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* Encodes double value to correct endianity.
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*
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* @param float $value Value to pack
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*/
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public static function packDouble(float $value): string
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{
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$bin = pack('d', (float) $value);
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if (self::$littleEndian === null) {
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self::$littleEndian = (pack('L', 1) === pack('V', 1));
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}
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if (self::$littleEndian) {
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return $bin;
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}
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return self::swap($bin);
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}
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/**
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* Returns shape name.
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*/
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public static function nameShape(int $type): string
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{
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if (isset(self::$shapeNames[$type])) {
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return self::$shapeNames[$type];
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}
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return sprintf('Shape %d', $type);
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}
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}
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