mirror of
https://github.com/YunoHost-Apps/webtrees_ynh.git
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97 lines
3.1 KiB
PHP
97 lines
3.1 KiB
PHP
<?php
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/**
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* webtrees: online genealogy
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* Copyright (C) 2016 webtrees development team
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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namespace Fisharebest\Webtrees\Functions;
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use Fisharebest\Webtrees\Log;
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/**
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* Class FunctionsMedia - common functions
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*/
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class FunctionsMedia {
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/**
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* Convert raw values from php.ini file into bytes
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*
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* @param string $val
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*
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* @return int
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*/
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public static function sizeToBytes($val) {
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if (!$val) {
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// no value was passed in, assume no limit and return -1
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$val = -1;
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}
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switch (substr($val, -1)) {
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case 'g':
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case 'G':
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return (int) $val * 1024 * 1024 * 1024;
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case 'm':
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case 'M':
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return (int) $val * 1024 * 1024;
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case 'k':
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case 'K':
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return (int) $val * 1024;
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default:
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return (int) $val;
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}
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}
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/**
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* Determine whether there is enough memory to load a particular image.
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*
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* @param string $serverFilename
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*
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* @return bool
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*/
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public static function hasMemoryForImage($serverFilename) {
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// find out how much total memory this script can access
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$memoryAvailable = self::sizeToBytes(ini_get('memory_limit'));
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// if memory is unlimited, it will return -1 and we don’t need to worry about it
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if ($memoryAvailable == -1) {
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return true;
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}
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// find out how much memory we are already using
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$memoryUsed = memory_get_usage();
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try {
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$imgsize = getimagesize($serverFilename);
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} catch (\ErrorException $ex) {
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// Not an image, or not a valid image?
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$imgsize = false;
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}
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// find out how much memory this image needs for processing, probably only works for jpegs
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// from comments on http://www.php.net/imagecreatefromjpeg
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if ($imgsize && isset($imgsize['bits']) && (isset($imgsize['channels']))) {
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$memoryNeeded = round(($imgsize[0] * $imgsize[1] * $imgsize['bits'] * $imgsize['channels'] / 8 + pow(2, 16)) * 1.65);
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$memorySpare = $memoryAvailable - $memoryUsed - $memoryNeeded;
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if ($memorySpare > 0) {
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// we have enough memory to load this file
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return true;
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} else {
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// not enough memory to load this file
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$image_info = sprintf('%.2fKB, %d × %d %d bits %d channels', filesize($serverFilename) / 1024, $imgsize[0], $imgsize[1], $imgsize['bits'], $imgsize['channels']);
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Log::addMediaLog('Cannot create thumbnail ' . $serverFilename . ' (' . $image_info . ') memory avail: ' . $memoryAvailable . ' used: ' . $memoryUsed . ' needed: ' . $memoryNeeded . ' spare: ' . $memorySpare);
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return false;
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}
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} else {
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// assume there is enough memory
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// TODO find out how to check memory needs for gif and png
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return true;
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}
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}
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}
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