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<?php
/**
* webtrees: online genealogy
* Copyright (C) 2015 webtrees 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/>.
*/
namespace Fisharebest\Webtrees\Functions;
use Fisharebest\Webtrees\Log;
/**
* Class FunctionsMedia - common functions
*/
class FunctionsMedia {
/**
* Convert raw values from php.ini file into bytes
*
* @param string $val
*
* @return int
*/
public static function sizeToBytes($val) {
if (!$val) {
// no value was passed in, assume no limit and return -1
$val = -1;
}
switch (substr($val, -1)) {
case 'g':
case 'G':
return (int) $val * 1024 * 1024 * 1024;
case 'm':
case 'M':
return (int) $val * 1024 * 1024;
case 'k':
case 'K':
return (int) $val * 1024;
default:
return (int) $val;
}
}
/**
* Determine whether there is enough memory to load a particular image.
*
* @param string $serverFilename
*
* @return bool
*/
public static function hasMemoryForImage($serverFilename) {
// find out how much total memory this script can access
$memoryAvailable = self::sizeToBytes(ini_get('memory_limit'));
// if memory is unlimited, it will return -1 and we don’t need to worry about it
if ($memoryAvailable == -1) {
return true;
}
// find out how much memory we are already using
$memoryUsed = memory_get_usage();
try {
$imgsize = getimagesize($serverFilename);
} catch (\ErrorException $ex) {
// Not an image, or not a valid image?
$imgsize = false;
}
// find out how much memory this image needs for processing, probably only works for jpegs
// from comments on http://www.php.net/imagecreatefromjpeg
if ($imgsize && isset($imgsize['bits']) && (isset($imgsize['channels']))) {
$memoryNeeded = round(($imgsize[0] * $imgsize[1] * $imgsize['bits'] * $imgsize['channels'] / 8 + Pow(2, 16)) * 1.65);
$memorySpare = $memoryAvailable - $memoryUsed - $memoryNeeded;
if ($memorySpare > 0) {
// we have enough memory to load this file
return true;
} else {
// not enough memory to load this file
$image_info = sprintf('%.2fKB, %d × %d %d bits %d channels', filesize($serverFilename) / 1024, $imgsize[0], $imgsize[1], $imgsize['bits'], $imgsize['channels']);
Log::addMediaLog('Cannot create thumbnail ' . $serverFilename . ' (' . $image_info . ') memory avail: ' . $memoryAvailable . ' used: ' . $memoryUsed . ' needed: ' . $memoryNeeded . ' spare: ' . $memorySpare);
return false;
}
} else {
// assume there is enough memory
// TODO find out how to check memory needs for gif and png
return true;
}
}
}
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