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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); } }
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