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<?php defined("SYSPATH") or die("No direct script access.");
/**
* Gallery - a web based photo album viewer and editor
* Copyright (C) 2000-2013 Bharat Mediratta
*
* 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.
*/
class system_Core {
/**
* Return the path to an executable version of the named binary, or null.
* Traverse the PATH environment variable looking for the given file. If
* the $priority_path variable is set, check that path first.
*/
static function find_binary($binary, $priority_path=null) {
$paths = array_merge(
explode(":", getenv("PATH")),
explode(":", module::get_var("gallery", "extra_binary_paths")));
if ($priority_path) {
array_unshift($paths, $priority_path);
}
foreach ($paths as $path) {
$candidate = "$path/$binary";
// @suppress errors below to avoid open_basedir issues
if (@file_exists($candidate) && @is_executable($candidate)) {
return $candidate;
}
}
return null;
}
/**
* Create a file with a unique file name.
* This helper is similar to the built-in tempnam.
* It allows the caller to specify a prefix and an extension.
* It always places the file in TMPPATH.
*/
static function temp_filename($prefix="", $extension="") {
do {
$basename = tempnam(TMPPATH, $prefix);
if (!$basename) {
return false;
}
$filename = "$basename.$extension";
$success = !file_exists($filename) && @rename($basename, $filename);
if (!$success) {
@unlink($basename);
}
} while (!$success);
return $filename;
}
}
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