| /* |
| * Copyright (c) 2015, 2017, 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 jdk.internal.jrtfs; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.net.URI; |
| import java.net.URISyntaxException; |
| import java.nio.channels.FileChannel; |
| import java.nio.channels.SeekableByteChannel; |
| import java.nio.file.*; |
| import java.nio.file.DirectoryStream.Filter; |
| import java.nio.file.attribute.BasicFileAttributes; |
| import java.nio.file.attribute.BasicFileAttributeView; |
| import java.nio.file.attribute.FileAttribute; |
| import java.nio.file.attribute.FileTime; |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.NoSuchElementException; |
| import java.util.Objects; |
| import java.util.Set; |
| import static java.nio.file.StandardOpenOption.*; |
| import static java.nio.file.StandardCopyOption.*; |
| |
| /** |
| * Base class for Path implementation of jrt file systems. |
| * |
| * @implNote This class needs to maintain JDK 8 source compatibility. |
| * |
| * It is used internally in the JDK to implement jimage/jrtfs access, |
| * but also compiled and delivered as part of the jrtfs.jar to support access |
| * to the jimage file provided by the shipped JDK by tools running on JDK 8. |
| */ |
| final class JrtPath implements Path { |
| |
| final JrtFileSystem jrtfs; |
| private final String path; |
| private volatile int[] offsets; |
| |
| JrtPath(JrtFileSystem jrtfs, String path) { |
| this.jrtfs = jrtfs; |
| this.path = normalize(path); |
| this.resolved = null; |
| } |
| |
| JrtPath(JrtFileSystem jrtfs, String path, boolean normalized) { |
| this.jrtfs = jrtfs; |
| this.path = normalized ? path : normalize(path); |
| this.resolved = null; |
| } |
| |
| final String getName() { |
| return path; |
| } |
| |
| @Override |
| public final JrtPath getRoot() { |
| if (this.isAbsolute()) { |
| return jrtfs.getRootPath(); |
| } else { |
| return null; |
| } |
| } |
| |
| @Override |
| public final JrtPath getFileName() { |
| if (path.isEmpty()) |
| return this; |
| if (path.length() == 1 && path.charAt(0) == '/') |
| return null; |
| int off = path.lastIndexOf('/'); |
| if (off == -1) |
| return this; |
| return new JrtPath(jrtfs, path.substring(off + 1), true); |
| } |
| |
| @Override |
| public final JrtPath getParent() { |
| initOffsets(); |
| int count = offsets.length; |
| if (count == 0) { // no elements so no parent |
| return null; |
| } |
| int off = offsets[count - 1] - 1; |
| if (off <= 0) { // parent is root only (may be null) |
| return getRoot(); |
| } |
| return new JrtPath(jrtfs, path.substring(0, off)); |
| } |
| |
| @Override |
| public final int getNameCount() { |
| initOffsets(); |
| return offsets.length; |
| } |
| |
| @Override |
| public final JrtPath getName(int index) { |
| initOffsets(); |
| if (index < 0 || index >= offsets.length) { |
| throw new IllegalArgumentException("index: " + |
| index + ", offsets length: " + offsets.length); |
| } |
| int begin = offsets[index]; |
| int end; |
| if (index == (offsets.length - 1)) { |
| end = path.length(); |
| } else { |
| end = offsets[index + 1]; |
| } |
| return new JrtPath(jrtfs, path.substring(begin, end)); |
| } |
| |
| @Override |
| public final JrtPath subpath(int beginIndex, int endIndex) { |
| initOffsets(); |
| if (beginIndex < 0 || endIndex > offsets.length || |
| beginIndex >= endIndex) { |
| throw new IllegalArgumentException( |
| "beginIndex: " + beginIndex + ", endIndex: " + endIndex + |
| ", offsets length: " + offsets.length); |
| } |
| // starting/ending offsets |
| int begin = offsets[beginIndex]; |
| int end; |
| if (endIndex == offsets.length) { |
| end = path.length(); |
| } else { |
| end = offsets[endIndex]; |
| } |
| return new JrtPath(jrtfs, path.substring(begin, end)); |
| } |
| |
| @Override |
| public final JrtPath toRealPath(LinkOption... options) throws IOException { |
| return jrtfs.toRealPath(this, options); |
| } |
| |
| @Override |
| public final JrtPath toAbsolutePath() { |
| if (isAbsolute()) |
| return this; |
| return new JrtPath(jrtfs, "/" + path, true); |
| } |
| |
| @Override |
| public final URI toUri() { |
| try { |
| return new URI("jrt", toAbsolutePath().path, null); |
| } catch (URISyntaxException ex) { |
| throw new AssertionError(ex); |
| } |
| } |
| |
| private boolean equalsNameAt(JrtPath other, int index) { |
| int mbegin = offsets[index]; |
| int mlen; |
| if (index == (offsets.length - 1)) { |
| mlen = path.length() - mbegin; |
| } else { |
| mlen = offsets[index + 1] - mbegin - 1; |
| } |
| int obegin = other.offsets[index]; |
| int olen; |
| if (index == (other.offsets.length - 1)) { |
| olen = other.path.length() - obegin; |
| } else { |
| olen = other.offsets[index + 1] - obegin - 1; |
| } |
| if (mlen != olen) { |
| return false; |
| } |
| int n = 0; |
| while (n < mlen) { |
| if (path.charAt(mbegin + n) != other.path.charAt(obegin + n)) { |
| return false; |
| } |
| n++; |
| } |
| return true; |
| } |
| |
| @Override |
| public final JrtPath relativize(Path other) { |
| final JrtPath o = checkPath(other); |
| if (o.equals(this)) { |
| return new JrtPath(jrtfs, "", true); |
| } |
| if (path.isEmpty()) { |
| return o; |
| } |
| if (jrtfs != o.jrtfs || isAbsolute() != o.isAbsolute()) { |
| throw new IllegalArgumentException( |
| "Incorrect filesystem or path: " + other); |
| } |
| final String tp = this.path; |
| final String op = o.path; |
| if (op.startsWith(tp)) { // fast path |
| int off = tp.length(); |
| if (op.charAt(off - 1) == '/') |
| return new JrtPath(jrtfs, op.substring(off), true); |
| if (op.charAt(off) == '/') |
| return new JrtPath(jrtfs, op.substring(off + 1), true); |
| } |
| int mc = this.getNameCount(); |
| int oc = o.getNameCount(); |
| int n = Math.min(mc, oc); |
| int i = 0; |
| while (i < n) { |
| if (!equalsNameAt(o, i)) { |
| break; |
| } |
| i++; |
| } |
| int dotdots = mc - i; |
| int len = dotdots * 3 - 1; |
| if (i < oc) { |
| len += (o.path.length() - o.offsets[i] + 1); |
| } |
| StringBuilder sb = new StringBuilder(len); |
| while (dotdots > 0) { |
| sb.append(".."); |
| if (sb.length() < len) { // no tailing slash at the end |
| sb.append('/'); |
| } |
| dotdots--; |
| } |
| if (i < oc) { |
| sb.append(o.path, o.offsets[i], o.path.length()); |
| } |
| return new JrtPath(jrtfs, sb.toString(), true); |
| } |
| |
| @Override |
| public JrtFileSystem getFileSystem() { |
| return jrtfs; |
| } |
| |
| @Override |
| public final boolean isAbsolute() { |
| return !path.isEmpty() && path.charAt(0) == '/'; |
| } |
| |
| @Override |
| public final JrtPath resolve(Path other) { |
| final JrtPath o = checkPath(other); |
| if (this.path.isEmpty() || o.isAbsolute()) { |
| return o; |
| } |
| if (o.path.isEmpty()) { |
| return this; |
| } |
| StringBuilder sb = new StringBuilder(path.length() + o.path.length() + 1); |
| sb.append(path); |
| if (path.charAt(path.length() - 1) != '/') |
| sb.append('/'); |
| sb.append(o.path); |
| return new JrtPath(jrtfs, sb.toString(), true); |
| } |
| |
| @Override |
| public final Path resolveSibling(Path other) { |
| Objects.requireNonNull(other, "other"); |
| Path parent = getParent(); |
| return (parent == null) ? other : parent.resolve(other); |
| } |
| |
| @Override |
| public final boolean startsWith(Path other) { |
| if (!(Objects.requireNonNull(other) instanceof JrtPath)) |
| return false; |
| final JrtPath o = (JrtPath)other; |
| final String tp = this.path; |
| final String op = o.path; |
| if (isAbsolute() != o.isAbsolute() || !tp.startsWith(op)) { |
| return false; |
| } |
| int off = op.length(); |
| if (off == 0) { |
| return tp.isEmpty(); |
| } |
| // check match is on name boundary |
| return tp.length() == off || tp.charAt(off) == '/' || |
| off == 0 || op.charAt(off - 1) == '/'; |
| } |
| |
| @Override |
| public final boolean endsWith(Path other) { |
| if (!(Objects.requireNonNull(other) instanceof JrtPath)) |
| return false; |
| final JrtPath o = (JrtPath)other; |
| final JrtPath t = this; |
| int olast = o.path.length() - 1; |
| if (olast > 0 && o.path.charAt(olast) == '/') { |
| olast--; |
| } |
| int last = t.path.length() - 1; |
| if (last > 0 && t.path.charAt(last) == '/') { |
| last--; |
| } |
| if (olast == -1) { // o.path.length == 0 |
| return last == -1; |
| } |
| if ((o.isAbsolute() && (!t.isAbsolute() || olast != last)) |
| || last < olast) { |
| return false; |
| } |
| for (; olast >= 0; olast--, last--) { |
| if (o.path.charAt(olast) != t.path.charAt(last)) { |
| return false; |
| } |
| } |
| return o.path.charAt(olast + 1) == '/' || |
| last == -1 || t.path.charAt(last) == '/'; |
| } |
| |
| @Override |
| public final JrtPath resolve(String other) { |
| return resolve(getFileSystem().getPath(other)); |
| } |
| |
| @Override |
| public final Path resolveSibling(String other) { |
| return resolveSibling(getFileSystem().getPath(other)); |
| } |
| |
| @Override |
| public final boolean startsWith(String other) { |
| return startsWith(getFileSystem().getPath(other)); |
| } |
| |
| @Override |
| public final boolean endsWith(String other) { |
| return endsWith(getFileSystem().getPath(other)); |
| } |
| |
| @Override |
| public final JrtPath normalize() { |
| String res = getResolved(); |
| if (res == path) { // no change |
| return this; |
| } |
| return new JrtPath(jrtfs, res, true); |
| } |
| |
| private JrtPath checkPath(Path path) { |
| Objects.requireNonNull(path); |
| if (!(path instanceof JrtPath)) |
| throw new ProviderMismatchException("path class: " + |
| path.getClass()); |
| return (JrtPath) path; |
| } |
| |
| // create offset list if not already created |
| private void initOffsets() { |
| if (this.offsets == null) { |
| int len = path.length(); |
| // count names |
| int count = 0; |
| int off = 0; |
| while (off < len) { |
| char c = path.charAt(off++); |
| if (c != '/') { |
| count++; |
| off = path.indexOf('/', off); |
| if (off == -1) |
| break; |
| } |
| } |
| // populate offsets |
| int[] offsets = new int[count]; |
| count = 0; |
| off = 0; |
| while (off < len) { |
| char c = path.charAt(off); |
| if (c == '/') { |
| off++; |
| } else { |
| offsets[count++] = off++; |
| off = path.indexOf('/', off); |
| if (off == -1) |
| break; |
| } |
| } |
| this.offsets = offsets; |
| } |
| } |
| |
| private volatile String resolved; |
| |
| final String getResolvedPath() { |
| String r = resolved; |
| if (r == null) { |
| if (isAbsolute()) { |
| r = getResolved(); |
| } else { |
| r = toAbsolutePath().getResolvedPath(); |
| } |
| resolved = r; |
| } |
| return r; |
| } |
| |
| // removes redundant slashs, replace "\" to separator "/" |
| // and check for invalid characters |
| private static String normalize(String path) { |
| int len = path.length(); |
| if (len == 0) { |
| return path; |
| } |
| char prevC = 0; |
| for (int i = 0; i < len; i++) { |
| char c = path.charAt(i); |
| if (c == '\\' || c == '\u0000') { |
| return normalize(path, i); |
| } |
| if (c == '/' && prevC == '/') { |
| return normalize(path, i - 1); |
| } |
| prevC = c; |
| } |
| if (prevC == '/' && len > 1) { |
| return path.substring(0, len - 1); |
| } |
| return path; |
| } |
| |
| private static String normalize(String path, int off) { |
| int len = path.length(); |
| StringBuilder to = new StringBuilder(len); |
| to.append(path, 0, off); |
| char prevC = 0; |
| while (off < len) { |
| char c = path.charAt(off++); |
| if (c == '\\') { |
| c = '/'; |
| } |
| if (c == '/' && prevC == '/') { |
| continue; |
| } |
| if (c == '\u0000') { |
| throw new InvalidPathException(path, |
| "Path: NUL character not allowed"); |
| } |
| to.append(c); |
| prevC = c; |
| } |
| len = to.length(); |
| if (len > 1 && to.charAt(len - 1) == '/') { |
| to.deleteCharAt(len - 1); |
| } |
| return to.toString(); |
| } |
| |
| // Remove DotSlash(./) and resolve DotDot (..) components |
| private String getResolved() { |
| int length = path.length(); |
| if (length == 0 || (path.indexOf("./") == -1 && path.charAt(length - 1) != '.')) { |
| return path; |
| } else { |
| return resolvePath(); |
| } |
| } |
| |
| private String resolvePath() { |
| int length = path.length(); |
| char[] to = new char[length]; |
| int nc = getNameCount(); |
| int[] lastM = new int[nc]; |
| int lastMOff = -1; |
| int m = 0; |
| for (int i = 0; i < nc; i++) { |
| int n = offsets[i]; |
| int len = (i == offsets.length - 1) ? length - n |
| : offsets[i + 1] - n - 1; |
| if (len == 1 && path.charAt(n) == '.') { |
| if (m == 0 && path.charAt(0) == '/') // absolute path |
| to[m++] = '/'; |
| continue; |
| } |
| if (len == 2 && path.charAt(n) == '.' && path.charAt(n + 1) == '.') { |
| if (lastMOff >= 0) { |
| m = lastM[lastMOff--]; // retreat |
| continue; |
| } |
| if (path.charAt(0) == '/') { // "/../xyz" skip |
| if (m == 0) |
| to[m++] = '/'; |
| } else { // "../xyz" -> "../xyz" |
| if (m != 0 && to[m-1] != '/') |
| to[m++] = '/'; |
| while (len-- > 0) |
| to[m++] = path.charAt(n++); |
| } |
| continue; |
| } |
| if (m == 0 && path.charAt(0) == '/' || // absolute path |
| m != 0 && to[m-1] != '/') { // not the first name |
| to[m++] = '/'; |
| } |
| lastM[++lastMOff] = m; |
| while (len-- > 0) |
| to[m++] = path.charAt(n++); |
| } |
| if (m > 1 && to[m - 1] == '/') |
| m--; |
| return (m == to.length) ? new String(to) : new String(to, 0, m); |
| } |
| |
| @Override |
| public final String toString() { |
| return path; |
| } |
| |
| @Override |
| public final int hashCode() { |
| return path.hashCode(); |
| } |
| |
| @Override |
| public final boolean equals(Object obj) { |
| return obj instanceof JrtPath && |
| this.path.equals(((JrtPath) obj).path); |
| } |
| |
| @Override |
| public final int compareTo(Path other) { |
| final JrtPath o = checkPath(other); |
| return path.compareTo(o.path); |
| } |
| |
| @Override |
| public final WatchKey register( |
| WatchService watcher, |
| WatchEvent.Kind<?>[] events, |
| WatchEvent.Modifier... modifiers) { |
| Objects.requireNonNull(watcher, "watcher"); |
| Objects.requireNonNull(events, "events"); |
| Objects.requireNonNull(modifiers, "modifiers"); |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public final WatchKey register(WatchService watcher, WatchEvent.Kind<?>... events) { |
| return register(watcher, events, new WatchEvent.Modifier[0]); |
| } |
| |
| @Override |
| public final File toFile() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public final Iterator<Path> iterator() { |
| return new Iterator<Path>() { |
| private int i = 0; |
| |
| @Override |
| public boolean hasNext() { |
| return (i < getNameCount()); |
| } |
| |
| @Override |
| public Path next() { |
| if (i < getNameCount()) { |
| Path result = getName(i); |
| i++; |
| return result; |
| } else { |
| throw new NoSuchElementException(); |
| } |
| } |
| |
| @Override |
| public void remove() { |
| throw new ReadOnlyFileSystemException(); |
| } |
| }; |
| } |
| |
| // Helpers for JrtFileSystemProvider and JrtFileSystem |
| |
| final JrtPath readSymbolicLink() throws IOException { |
| if (!jrtfs.isLink(this)) { |
| throw new IOException("not a symbolic link"); |
| } |
| return jrtfs.resolveLink(this); |
| } |
| |
| final boolean isHidden() { |
| return false; |
| } |
| |
| final void createDirectory(FileAttribute<?>... attrs) |
| throws IOException { |
| jrtfs.createDirectory(this, attrs); |
| } |
| |
| final InputStream newInputStream(OpenOption... options) throws IOException { |
| if (options.length > 0) { |
| for (OpenOption opt : options) { |
| if (opt != READ) { |
| throw new UnsupportedOperationException("'" + opt + "' not allowed"); |
| } |
| } |
| } |
| return jrtfs.newInputStream(this); |
| } |
| |
| final DirectoryStream<Path> newDirectoryStream(Filter<? super Path> filter) |
| throws IOException { |
| return new JrtDirectoryStream(this, filter); |
| } |
| |
| final void delete() throws IOException { |
| jrtfs.deleteFile(this, true); |
| } |
| |
| final void deleteIfExists() throws IOException { |
| jrtfs.deleteFile(this, false); |
| } |
| |
| final JrtFileAttributes getAttributes(LinkOption... options) throws IOException { |
| JrtFileAttributes zfas = jrtfs.getFileAttributes(this, options); |
| if (zfas == null) { |
| throw new NoSuchFileException(toString()); |
| } |
| return zfas; |
| } |
| |
| final void setAttribute(String attribute, Object value, LinkOption... options) |
| throws IOException { |
| JrtFileAttributeView.setAttribute(this, attribute, value); |
| } |
| |
| final Map<String, Object> readAttributes(String attributes, LinkOption... options) |
| throws IOException { |
| return JrtFileAttributeView.readAttributes(this, attributes, options); |
| } |
| |
| final void setTimes(FileTime mtime, FileTime atime, FileTime ctime) |
| throws IOException { |
| jrtfs.setTimes(this, mtime, atime, ctime); |
| } |
| |
| final FileStore getFileStore() throws IOException { |
| // each JrtFileSystem only has one root (as requested for now) |
| if (exists()) { |
| return jrtfs.getFileStore(this); |
| } |
| throw new NoSuchFileException(path); |
| } |
| |
| final boolean isSameFile(Path other) throws IOException { |
| if (this == other || this.equals(other)) { |
| return true; |
| } |
| if (other == null || this.getFileSystem() != other.getFileSystem()) { |
| return false; |
| } |
| this.checkAccess(); |
| JrtPath o = (JrtPath) other; |
| o.checkAccess(); |
| return this.getResolvedPath().equals(o.getResolvedPath()) || |
| jrtfs.isSameFile(this, o); |
| } |
| |
| final SeekableByteChannel newByteChannel(Set<? extends OpenOption> options, |
| FileAttribute<?>... attrs) |
| throws IOException |
| { |
| return jrtfs.newByteChannel(this, options, attrs); |
| } |
| |
| final FileChannel newFileChannel(Set<? extends OpenOption> options, |
| FileAttribute<?>... attrs) |
| throws IOException { |
| return jrtfs.newFileChannel(this, options, attrs); |
| } |
| |
| final void checkAccess(AccessMode... modes) throws IOException { |
| if (modes.length == 0) { // check if the path exists |
| jrtfs.checkNode(this); // no need to follow link. the "link" node |
| // is built from real node under "/module" |
| } else { |
| boolean w = false; |
| for (AccessMode mode : modes) { |
| switch (mode) { |
| case READ: |
| break; |
| case WRITE: |
| w = true; |
| break; |
| case EXECUTE: |
| throw new AccessDeniedException(toString()); |
| default: |
| throw new UnsupportedOperationException(); |
| } |
| } |
| jrtfs.checkNode(this); |
| if (w && jrtfs.isReadOnly()) { |
| throw new AccessDeniedException(toString()); |
| } |
| } |
| } |
| |
| final boolean exists() { |
| try { |
| return jrtfs.exists(this); |
| } catch (IOException x) {} |
| return false; |
| } |
| |
| final OutputStream newOutputStream(OpenOption... options) throws IOException { |
| if (options.length == 0) { |
| return jrtfs.newOutputStream(this, CREATE_NEW, WRITE); |
| } |
| return jrtfs.newOutputStream(this, options); |
| } |
| |
| final void move(JrtPath target, CopyOption... options) throws IOException { |
| if (this.jrtfs == target.jrtfs) { |
| jrtfs.copyFile(true, this, target, options); |
| } else { |
| copyToTarget(target, options); |
| delete(); |
| } |
| } |
| |
| final void copy(JrtPath target, CopyOption... options) throws IOException { |
| if (this.jrtfs == target.jrtfs) { |
| jrtfs.copyFile(false, this, target, options); |
| } else { |
| copyToTarget(target, options); |
| } |
| } |
| |
| private void copyToTarget(JrtPath target, CopyOption... options) |
| throws IOException { |
| boolean replaceExisting = false; |
| boolean copyAttrs = false; |
| for (CopyOption opt : options) { |
| if (opt == REPLACE_EXISTING) { |
| replaceExisting = true; |
| } else if (opt == COPY_ATTRIBUTES) { |
| copyAttrs = true; |
| } |
| } |
| // attributes of source file |
| BasicFileAttributes jrtfas = getAttributes(); |
| // check if target exists |
| boolean exists; |
| if (replaceExisting) { |
| try { |
| target.deleteIfExists(); |
| exists = false; |
| } catch (DirectoryNotEmptyException x) { |
| exists = true; |
| } |
| } else { |
| exists = target.exists(); |
| } |
| if (exists) { |
| throw new FileAlreadyExistsException(target.toString()); |
| } |
| if (jrtfas.isDirectory()) { |
| // create directory or file |
| target.createDirectory(); |
| } else { |
| try (InputStream is = jrtfs.newInputStream(this); |
| OutputStream os = target.newOutputStream()) { |
| byte[] buf = new byte[8192]; |
| int n; |
| while ((n = is.read(buf)) != -1) { |
| os.write(buf, 0, n); |
| } |
| } |
| } |
| if (copyAttrs) { |
| BasicFileAttributeView view = |
| Files.getFileAttributeView(target, BasicFileAttributeView.class); |
| try { |
| view.setTimes(jrtfas.lastModifiedTime(), |
| jrtfas.lastAccessTime(), |
| jrtfas.creationTime()); |
| } catch (IOException x) { |
| try { |
| target.delete(); // rollback? |
| } catch (IOException ignore) {} |
| throw x; |
| } |
| } |
| } |
| } |
