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<?php
// Various functions used by the media DB interface
//
// webtrees: Web based Family History software
// Copyright (C) 2014 webtrees development team.
//
// Derived from PhpGedView
// Copyright (C) 2002 to 2009 PGV Development Team. All rights reserved.
//
// 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
use WT\Log;
if (!defined('WT_WEBTREES')) {
header('HTTP/1.0 403 Forbidden');
exit;
}
// converts raw values from php.ini file into bytes
// from http://www.php.net/manual/en/function.ini-get.php
function return_bytes($val) {
if (!$val) {
// no value was passed in, assume no limit and return -1
$val = -1;
}
$val = trim($val);
$last = strtolower($val{strlen($val)-1});
switch($last) {
case 'g': $val *= 1024; // fallthrough
case 'm': $val *= 1024; // fallthrough
case 'k': $val *= 1024;
}
return $val;
}
// attempts to determine whether there is enough memory to load a particular image
function hasMemoryForImage($serverFilename) {
// find out how much total memory this script can access
$memoryAvailable = return_bytes(@ini_get('memory_limit'));
// if memory is unlimited, it will return -1 and we don’t need to worry about it
if ($memoryAvailable == -1) return true;
// find out how much memory we are already using
$memoryUsed=memory_get_usage();
$imgsize = @getimagesize($serverFilename);
// find out how much memory this image needs for processing, probably only works for jpegs
// from comments on http://www.php.net/imagecreatefromjpeg
if (is_array($imgsize) && isset($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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