| /* |
| * Copyright (c) 2008, 2021, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.nio.fs; |
| |
| import java.nio.file.*; |
| import static java.nio.file.StandardOpenOption.*; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.FileChannel; |
| import java.io.IOException; |
| import java.util.*; |
| import jdk.internal.misc.Unsafe; |
| |
| import static sun.nio.fs.WindowsNativeDispatcher.*; |
| import static sun.nio.fs.WindowsConstants.*; |
| |
| /** |
| * Windows emulation of NamedAttributeView using Alternative Data Streams |
| */ |
| |
| class WindowsUserDefinedFileAttributeView |
| extends AbstractUserDefinedFileAttributeView |
| { |
| private static final Unsafe unsafe = Unsafe.getUnsafe(); |
| |
| // syntax to address named streams |
| private String join(String file, String name) { |
| if (name == null) |
| throw new NullPointerException("'name' is null"); |
| return file + ":" + name; |
| } |
| private String join(WindowsPath file, String name) throws WindowsException { |
| return join(file.getPathForWin32Calls(), name); |
| } |
| |
| private final WindowsPath file; |
| private final boolean followLinks; |
| |
| WindowsUserDefinedFileAttributeView(WindowsPath file, boolean followLinks) { |
| this.file = file; |
| this.followLinks = followLinks; |
| } |
| |
| // enumerates the file streams using FindFirstStream/FindNextStream APIs. |
| private List<String> listUsingStreamEnumeration() throws IOException { |
| List<String> list = new ArrayList<>(); |
| try { |
| FirstStream first = FindFirstStream(file.getPathForWin32Calls()); |
| if (first != null) { |
| long handle = first.handle(); |
| try { |
| // first stream is always ::$DATA for files |
| String name = first.name(); |
| if (!name.equals("::$DATA")) { |
| String[] segs = name.split(":"); |
| list.add(segs[1]); |
| } |
| while ((name = FindNextStream(handle)) != null) { |
| String[] segs = name.split(":"); |
| list.add(segs[1]); |
| } |
| } finally { |
| FindClose(handle); |
| } |
| } |
| } catch (WindowsException x) { |
| x.rethrowAsIOException(file); |
| } |
| return Collections.unmodifiableList(list); |
| } |
| |
| @SuppressWarnings("removal") |
| @Override |
| public List<String> list() throws IOException { |
| if (System.getSecurityManager() != null) |
| checkAccess(file.getPathForPermissionCheck(), true, false); |
| return listUsingStreamEnumeration(); |
| } |
| |
| @SuppressWarnings("removal") |
| @Override |
| public int size(String name) throws IOException { |
| if (System.getSecurityManager() != null) |
| checkAccess(file.getPathForPermissionCheck(), true, false); |
| |
| // wrap with channel |
| FileChannel fc = null; |
| try { |
| Set<OpenOption> opts = new HashSet<>(); |
| opts.add(READ); |
| if (!followLinks) |
| opts.add(WindowsChannelFactory.OPEN_REPARSE_POINT); |
| fc = WindowsChannelFactory |
| .newFileChannel(join(file, name), null, opts, 0L); |
| } catch (WindowsException x) { |
| x.rethrowAsIOException(join(file.getPathForPermissionCheck(), name)); |
| } |
| try { |
| long size = fc.size(); |
| if (size > Integer.MAX_VALUE) |
| throw new ArithmeticException("Stream too large"); |
| return (int)size; |
| } finally { |
| fc.close(); |
| } |
| } |
| |
| @SuppressWarnings("removal") |
| @Override |
| public int read(String name, ByteBuffer dst) throws IOException { |
| if (System.getSecurityManager() != null) |
| checkAccess(file.getPathForPermissionCheck(), true, false); |
| |
| // wrap with channel |
| FileChannel fc = null; |
| try { |
| Set<OpenOption> opts = new HashSet<>(); |
| opts.add(READ); |
| if (!followLinks) |
| opts.add(WindowsChannelFactory.OPEN_REPARSE_POINT); |
| fc = WindowsChannelFactory |
| .newFileChannel(join(file, name), null, opts, 0L); |
| } catch (WindowsException x) { |
| x.rethrowAsIOException(join(file.getPathForPermissionCheck(), name)); |
| } |
| |
| // read to EOF (nothing we can do if I/O error occurs) |
| try { |
| if (fc.size() > dst.remaining()) |
| throw new IOException("Stream too large"); |
| int total = 0; |
| while (dst.hasRemaining()) { |
| int n = fc.read(dst); |
| if (n < 0) |
| break; |
| total += n; |
| } |
| return total; |
| } finally { |
| fc.close(); |
| } |
| } |
| |
| @SuppressWarnings("removal") |
| @Override |
| public int write(String name, ByteBuffer src) throws IOException { |
| if (System.getSecurityManager() != null) |
| checkAccess(file.getPathForPermissionCheck(), false, true); |
| |
| /** |
| * Creating a named stream will cause the unnamed stream to be created |
| * if it doesn't already exist. To avoid this we open the unnamed stream |
| * for reading and hope it isn't deleted/moved while we create or |
| * replace the named stream. Opening the file without sharing options |
| * may cause sharing violations with other programs that are accessing |
| * the unnamed stream. |
| */ |
| long handle = -1L; |
| try { |
| int flags = FILE_FLAG_BACKUP_SEMANTICS; |
| if (!followLinks) |
| flags |= FILE_FLAG_OPEN_REPARSE_POINT; |
| |
| handle = CreateFile(file.getPathForWin32Calls(), |
| GENERIC_READ, |
| (FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE), |
| OPEN_EXISTING, |
| flags); |
| } catch (WindowsException x) { |
| x.rethrowAsIOException(file); |
| } |
| try { |
| Set<OpenOption> opts = new HashSet<>(); |
| if (!followLinks) |
| opts.add(WindowsChannelFactory.OPEN_REPARSE_POINT); |
| opts.add(CREATE); |
| opts.add(WRITE); |
| opts.add(StandardOpenOption.TRUNCATE_EXISTING); |
| FileChannel named = null; |
| try { |
| named = WindowsChannelFactory |
| .newFileChannel(join(file, name), null, opts, 0L); |
| } catch (WindowsException x) { |
| x.rethrowAsIOException(join(file.getPathForPermissionCheck(), name)); |
| } |
| // write value (nothing we can do if I/O error occurs) |
| try { |
| int rem = src.remaining(); |
| while (src.hasRemaining()) { |
| named.write(src); |
| } |
| return rem; |
| } finally { |
| named.close(); |
| } |
| } finally { |
| CloseHandle(handle); |
| } |
| } |
| |
| @SuppressWarnings("removal") |
| @Override |
| public void delete(String name) throws IOException { |
| if (System.getSecurityManager() != null) |
| checkAccess(file.getPathForPermissionCheck(), false, true); |
| |
| String path = WindowsLinkSupport.getFinalPath(file, followLinks); |
| String toDelete = join(path, name); |
| try { |
| DeleteFile(toDelete); |
| } catch (WindowsException x) { |
| x.rethrowAsIOException(toDelete); |
| } |
| } |
| } |