| /* |
| * Copyright (c) 1998, 2016, 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 java.io; |
| |
| import java.util.Properties; |
| import sun.security.action.GetPropertyAction; |
| |
| |
| class UnixFileSystem extends FileSystem { |
| |
| private final char slash; |
| private final char colon; |
| private final String javaHome; |
| |
| public UnixFileSystem() { |
| Properties props = GetPropertyAction.privilegedGetProperties(); |
| slash = props.getProperty("file.separator").charAt(0); |
| colon = props.getProperty("path.separator").charAt(0); |
| javaHome = props.getProperty("java.home"); |
| } |
| |
| |
| /* -- Normalization and construction -- */ |
| |
| public char getSeparator() { |
| return slash; |
| } |
| |
| public char getPathSeparator() { |
| return colon; |
| } |
| |
| /* A normal Unix pathname contains no duplicate slashes and does not end |
| with a slash. It may be the empty string. */ |
| |
| /* Normalize the given pathname, whose length is len, starting at the given |
| offset; everything before this offset is already normal. */ |
| private String normalize(String pathname, int len, int off) { |
| if (len == 0) return pathname; |
| int n = len; |
| while ((n > 0) && (pathname.charAt(n - 1) == '/')) n--; |
| if (n == 0) return "/"; |
| StringBuilder sb = new StringBuilder(pathname.length()); |
| if (off > 0) sb.append(pathname, 0, off); |
| char prevChar = 0; |
| for (int i = off; i < n; i++) { |
| char c = pathname.charAt(i); |
| if ((prevChar == '/') && (c == '/')) continue; |
| sb.append(c); |
| prevChar = c; |
| } |
| return sb.toString(); |
| } |
| |
| /* Check that the given pathname is normal. If not, invoke the real |
| normalizer on the part of the pathname that requires normalization. |
| This way we iterate through the whole pathname string only once. */ |
| public String normalize(String pathname) { |
| int n = pathname.length(); |
| char prevChar = 0; |
| for (int i = 0; i < n; i++) { |
| char c = pathname.charAt(i); |
| if ((prevChar == '/') && (c == '/')) |
| return normalize(pathname, n, i - 1); |
| prevChar = c; |
| } |
| if (prevChar == '/') return normalize(pathname, n, n - 1); |
| return pathname; |
| } |
| |
| public int prefixLength(String pathname) { |
| if (pathname.length() == 0) return 0; |
| return (pathname.charAt(0) == '/') ? 1 : 0; |
| } |
| |
| public String resolve(String parent, String child) { |
| if (child.equals("")) return parent; |
| if (child.charAt(0) == '/') { |
| if (parent.equals("/")) return child; |
| return parent + child; |
| } |
| if (parent.equals("/")) return parent + child; |
| return parent + '/' + child; |
| } |
| |
| public String getDefaultParent() { |
| return "/"; |
| } |
| |
| public String fromURIPath(String path) { |
| String p = path; |
| if (p.endsWith("/") && (p.length() > 1)) { |
| // "/foo/" --> "/foo", but "/" --> "/" |
| p = p.substring(0, p.length() - 1); |
| } |
| return p; |
| } |
| |
| |
| /* -- Path operations -- */ |
| |
| public boolean isAbsolute(File f) { |
| return (f.getPrefixLength() != 0); |
| } |
| |
| public String resolve(File f) { |
| if (isAbsolute(f)) return f.getPath(); |
| return resolve(System.getProperty("user.dir"), f.getPath()); |
| } |
| |
| // Caches for canonicalization results to improve startup performance. |
| // The first cache handles repeated canonicalizations of the same path |
| // name. The prefix cache handles repeated canonicalizations within the |
| // same directory, and must not create results differing from the true |
| // canonicalization algorithm in canonicalize_md.c. For this reason the |
| // prefix cache is conservative and is not used for complex path names. |
| private ExpiringCache cache = new ExpiringCache(); |
| // On Unix symlinks can jump anywhere in the file system, so we only |
| // treat prefixes in java.home as trusted and cacheable in the |
| // canonicalization algorithm |
| private ExpiringCache javaHomePrefixCache = new ExpiringCache(); |
| |
| public String canonicalize(String path) throws IOException { |
| if (!useCanonCaches) { |
| return canonicalize0(path); |
| } else { |
| String res = cache.get(path); |
| if (res == null) { |
| String dir = null; |
| String resDir = null; |
| if (useCanonPrefixCache) { |
| // Note that this can cause symlinks that should |
| // be resolved to a destination directory to be |
| // resolved to the directory they're contained in |
| dir = parentOrNull(path); |
| if (dir != null) { |
| resDir = javaHomePrefixCache.get(dir); |
| if (resDir != null) { |
| // Hit only in prefix cache; full path is canonical |
| String filename = path.substring(1 + dir.length()); |
| res = resDir + slash + filename; |
| cache.put(dir + slash + filename, res); |
| } |
| } |
| } |
| if (res == null) { |
| res = canonicalize0(path); |
| cache.put(path, res); |
| if (useCanonPrefixCache && |
| dir != null && dir.startsWith(javaHome)) { |
| resDir = parentOrNull(res); |
| // Note that we don't allow a resolved symlink |
| // to elsewhere in java.home to pollute the |
| // prefix cache (java.home prefix cache could |
| // just as easily be a set at this point) |
| if (resDir != null && resDir.equals(dir)) { |
| File f = new File(res); |
| if (f.exists() && !f.isDirectory()) { |
| javaHomePrefixCache.put(dir, resDir); |
| } |
| } |
| } |
| } |
| } |
| return res; |
| } |
| } |
| private native String canonicalize0(String path) throws IOException; |
| // Best-effort attempt to get parent of this path; used for |
| // optimization of filename canonicalization. This must return null for |
| // any cases where the code in canonicalize_md.c would throw an |
| // exception or otherwise deal with non-simple pathnames like handling |
| // of "." and "..". It may conservatively return null in other |
| // situations as well. Returning null will cause the underlying |
| // (expensive) canonicalization routine to be called. |
| static String parentOrNull(String path) { |
| if (path == null) return null; |
| char sep = File.separatorChar; |
| int last = path.length() - 1; |
| int idx = last; |
| int adjacentDots = 0; |
| int nonDotCount = 0; |
| while (idx > 0) { |
| char c = path.charAt(idx); |
| if (c == '.') { |
| if (++adjacentDots >= 2) { |
| // Punt on pathnames containing . and .. |
| return null; |
| } |
| } else if (c == sep) { |
| if (adjacentDots == 1 && nonDotCount == 0) { |
| // Punt on pathnames containing . and .. |
| return null; |
| } |
| if (idx == 0 || |
| idx >= last - 1 || |
| path.charAt(idx - 1) == sep) { |
| // Punt on pathnames containing adjacent slashes |
| // toward the end |
| return null; |
| } |
| return path.substring(0, idx); |
| } else { |
| ++nonDotCount; |
| adjacentDots = 0; |
| } |
| --idx; |
| } |
| return null; |
| } |
| |
| /* -- Attribute accessors -- */ |
| |
| public native int getBooleanAttributes0(File f); |
| |
| public int getBooleanAttributes(File f) { |
| int rv = getBooleanAttributes0(f); |
| String name = f.getName(); |
| boolean hidden = (name.length() > 0) && (name.charAt(0) == '.'); |
| return rv | (hidden ? BA_HIDDEN : 0); |
| } |
| |
| public native boolean checkAccess(File f, int access); |
| public native long getLastModifiedTime(File f); |
| public native long getLength(File f); |
| public native boolean setPermission(File f, int access, boolean enable, boolean owneronly); |
| |
| /* -- File operations -- */ |
| |
| public native boolean createFileExclusively(String path) |
| throws IOException; |
| public boolean delete(File f) { |
| // Keep canonicalization caches in sync after file deletion |
| // and renaming operations. Could be more clever than this |
| // (i.e., only remove/update affected entries) but probably |
| // not worth it since these entries expire after 30 seconds |
| // anyway. |
| cache.clear(); |
| javaHomePrefixCache.clear(); |
| return delete0(f); |
| } |
| private native boolean delete0(File f); |
| public native String[] list(File f); |
| public native boolean createDirectory(File f); |
| public boolean rename(File f1, File f2) { |
| // Keep canonicalization caches in sync after file deletion |
| // and renaming operations. Could be more clever than this |
| // (i.e., only remove/update affected entries) but probably |
| // not worth it since these entries expire after 30 seconds |
| // anyway. |
| cache.clear(); |
| javaHomePrefixCache.clear(); |
| return rename0(f1, f2); |
| } |
| private native boolean rename0(File f1, File f2); |
| public native boolean setLastModifiedTime(File f, long time); |
| public native boolean setReadOnly(File f); |
| |
| |
| /* -- Filesystem interface -- */ |
| |
| public File[] listRoots() { |
| try { |
| SecurityManager security = System.getSecurityManager(); |
| if (security != null) { |
| security.checkRead("/"); |
| } |
| return new File[] { new File("/") }; |
| } catch (SecurityException x) { |
| return new File[0]; |
| } |
| } |
| |
| /* -- Disk usage -- */ |
| public native long getSpace(File f, int t); |
| |
| /* -- Basic infrastructure -- */ |
| |
| private native long getNameMax0(String path); |
| |
| public int getNameMax(String path) { |
| long nameMax = getNameMax0(path); |
| if (nameMax > Integer.MAX_VALUE) { |
| nameMax = Integer.MAX_VALUE; |
| } |
| return (int)nameMax; |
| } |
| |
| public int compare(File f1, File f2) { |
| return f1.getPath().compareTo(f2.getPath()); |
| } |
| |
| public int hashCode(File f) { |
| return f.getPath().hashCode() ^ 1234321; |
| } |
| |
| |
| private static native void initIDs(); |
| |
| static { |
| initIDs(); |
| } |
| |
| } |