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<?php
require_once __DIR__ . "/wfInvalidPathException.php";
require_once __DIR__ . "/wfInaccessibleDirectoryException.php";
class wfFileUtils {
const CURRENT_DIRECTORY = '.';
const PARENT_DIRECTORY = '..';
const DIRECTORY_SEPARATOR = '/';
public static function isCurrentOrParentDirectory($file) {
return $file === self::CURRENT_DIRECTORY || $file === self::PARENT_DIRECTORY;
}
public static function getContents($directory) {
$contents = @scandir($directory);
if ($contents === false)
throw new wfInaccessibleDirectoryException("Unable to read contents", $directory);
return array_filter($contents, function ($file) { return !wfFileUtils::isCurrentOrParentDirectory($file); });
}
public static function trimSeparators($path, $trimLeft = true, $trimRight = true) {
if ($trimLeft)
$path = ltrim($path, self::DIRECTORY_SEPARATOR);
if ($trimRight)
$path = rtrim($path, self::DIRECTORY_SEPARATOR);
return $path;
}
public static function joinPaths() {
$paths = func_get_args();
$count = count($paths);
$filtered = array();
$trailingSeparator = false;
for ($i = 0; $i < $count; $i++) {
$path = self::trimSeparators($paths[$i], !empty($filtered));
if (!empty($path)) {
$filtered[] = $path;
$trailingSeparator = substr($paths[$i], -1) === self::DIRECTORY_SEPARATOR;
}
}
return implode(self::DIRECTORY_SEPARATOR, $filtered) . ($trailingSeparator ? self::DIRECTORY_SEPARATOR : '');
}
public static function splitPath($path, &$count = null) {
$components = array_values(array_filter(explode(self::DIRECTORY_SEPARATOR, $path)));
$count = count($components);
return $components;
}
public static function isReadableFile($file) {
return @is_file($file) && @is_readable($file);
}
public static function belongsTo($child, $parent) {
$childComponents = self::splitPath($child, $childCount);
$parentComponents = self::splitPath($parent, $parentCount);
if ($childCount < $parentCount)
return false;
for ($i = 0; $i < $parentCount; $i++) {
if ($childComponents[$i] !== $parentComponents[$i])
return false;
}
return true;
}
public static function matchPaths($a, $b, $allowChild = false) {
$aComponents = self::splitPath($a, $aCount);
$bComponents = self::splitPath($b, $bCount);
if ($allowChild ? ($bCount < $aCount) : ($aCount !== $bCount))
return false;
for ($i = 0; $i < $aCount; $i++) {
if ($aComponents[$i] !== $bComponents[$i])
return false;
}
return true;
}
public static function realPath($path) {
$realPath = realpath($path);
if ($realPath === false)
throw new wfInvalidPathException("Realpath resolution failed", $path);
return $realPath;
}
public static function isChild($parent, $child) {
return self::matchPaths($parent, $child, true);
}
}