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649 lines
22 KiB
649 lines
22 KiB
/*
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* Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package java.io;
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import java.security.AccessController;
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import java.util.Locale;
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import sun.security.action.GetPropertyAction;
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/**
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* Unicode-aware FileSystem for Windows NT/2000.
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*
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* @author Konstantin Kladko
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* @since 1.4
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*/
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class WinNTFileSystem extends FileSystem {
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private final char slash;
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private final char altSlash;
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private final char semicolon;
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public WinNTFileSystem() {
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slash = AccessController.doPrivileged(
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new GetPropertyAction("file.separator")).charAt(0);
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semicolon = AccessController.doPrivileged(
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new GetPropertyAction("path.separator")).charAt(0);
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altSlash = (this.slash == '\\') ? '/' : '\\';
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}
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private boolean isSlash(char c) {
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return (c == '\\') || (c == '/');
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}
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private boolean isLetter(char c) {
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return ((c >= 'a') && (c <= 'z')) || ((c >= 'A') && (c <= 'Z'));
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}
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private String slashify(String p) {
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if ((p.length() > 0) && (p.charAt(0) != slash)) return slash + p;
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else return p;
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}
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/* -- Normalization and construction -- */
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@Override
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public char getSeparator() {
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return slash;
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}
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@Override
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public char getPathSeparator() {
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return semicolon;
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}
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/* Check that the given pathname is normal. If not, invoke the real
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normalizer on the part of the pathname that requires normalization.
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This way we iterate through the whole pathname string only once. */
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@Override
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public String normalize(String path) {
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int n = path.length();
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char slash = this.slash;
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char altSlash = this.altSlash;
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char prev = 0;
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for (int i = 0; i < n; i++) {
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char c = path.charAt(i);
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if (c == altSlash)
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return normalize(path, n, (prev == slash) ? i - 1 : i);
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if ((c == slash) && (prev == slash) && (i > 1))
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return normalize(path, n, i - 1);
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if ((c == ':') && (i > 1))
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return normalize(path, n, 0);
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prev = c;
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}
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if (prev == slash) return normalize(path, n, n - 1);
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return path;
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}
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/* Normalize the given pathname, whose length is len, starting at the given
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offset; everything before this offset is already normal. */
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private String normalize(String path, int len, int off) {
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if (len == 0) return path;
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if (off < 3) off = 0; /* Avoid fencepost cases with UNC pathnames */
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int src;
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char slash = this.slash;
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StringBuffer sb = new StringBuffer(len);
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if (off == 0) {
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/* Complete normalization, including prefix */
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src = normalizePrefix(path, len, sb);
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} else {
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/* Partial normalization */
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src = off;
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sb.append(path.substring(0, off));
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}
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/* Remove redundant slashes from the remainder of the path, forcing all
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slashes into the preferred slash */
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while (src < len) {
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char c = path.charAt(src++);
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if (isSlash(c)) {
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while ((src < len) && isSlash(path.charAt(src))) src++;
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if (src == len) {
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/* Check for trailing separator */
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int sn = sb.length();
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if ((sn == 2) && (sb.charAt(1) == ':')) {
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/* "z:\\" */
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sb.append(slash);
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break;
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}
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if (sn == 0) {
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/* "\\" */
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sb.append(slash);
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break;
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}
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if ((sn == 1) && (isSlash(sb.charAt(0)))) {
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/* "\\\\" is not collapsed to "\\" because "\\\\" marks
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the beginning of a UNC pathname. Even though it is
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not, by itself, a valid UNC pathname, we leave it as
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is in order to be consistent with the win32 APIs,
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which treat this case as an invalid UNC pathname
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rather than as an alias for the root directory of
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the current drive. */
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sb.append(slash);
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break;
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}
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/* Path does not denote a root directory, so do not append
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trailing slash */
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break;
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} else {
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sb.append(slash);
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}
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} else {
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sb.append(c);
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}
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}
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String rv = sb.toString();
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return rv;
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}
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/* A normal Win32 pathname contains no duplicate slashes, except possibly
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for a UNC prefix, and does not end with a slash. It may be the empty
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string. Normalized Win32 pathnames have the convenient property that
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the length of the prefix almost uniquely identifies the type of the path
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and whether it is absolute or relative:
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0 relative to both drive and directory
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1 drive-relative (begins with '\\')
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2 absolute UNC (if first char is '\\'),
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else directory-relative (has form "z:foo")
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3 absolute local pathname (begins with "z:\\")
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*/
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private int normalizePrefix(String path, int len, StringBuffer sb) {
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int src = 0;
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while ((src < len) && isSlash(path.charAt(src))) src++;
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char c;
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if ((len - src >= 2)
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&& isLetter(c = path.charAt(src))
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&& path.charAt(src + 1) == ':') {
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/* Remove leading slashes if followed by drive specifier.
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This hack is necessary to support file URLs containing drive
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specifiers (e.g., "file://c:/path"). As a side effect,
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"/c:/path" can be used as an alternative to "c:/path". */
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sb.append(c);
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sb.append(':');
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src += 2;
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} else {
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src = 0;
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if ((len >= 2)
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&& isSlash(path.charAt(0))
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&& isSlash(path.charAt(1))) {
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/* UNC pathname: Retain first slash; leave src pointed at
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second slash so that further slashes will be collapsed
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into the second slash. The result will be a pathname
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beginning with "\\\\" followed (most likely) by a host
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name. */
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src = 1;
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sb.append(slash);
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}
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}
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return src;
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}
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@Override
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public int prefixLength(String path) {
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char slash = this.slash;
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int n = path.length();
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if (n == 0) return 0;
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char c0 = path.charAt(0);
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char c1 = (n > 1) ? path.charAt(1) : 0;
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if (c0 == slash) {
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if (c1 == slash) return 2; /* Absolute UNC pathname "\\\\foo" */
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return 1; /* Drive-relative "\\foo" */
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}
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if (isLetter(c0) && (c1 == ':')) {
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if ((n > 2) && (path.charAt(2) == slash))
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return 3; /* Absolute local pathname "z:\\foo" */
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return 2; /* Directory-relative "z:foo" */
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}
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return 0; /* Completely relative */
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}
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@Override
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public String resolve(String parent, String child) {
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int pn = parent.length();
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if (pn == 0) return child;
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int cn = child.length();
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if (cn == 0) return parent;
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String c = child;
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int childStart = 0;
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int parentEnd = pn;
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if ((cn > 1) && (c.charAt(0) == slash)) {
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if (c.charAt(1) == slash) {
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/* Drop prefix when child is a UNC pathname */
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childStart = 2;
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} else {
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/* Drop prefix when child is drive-relative */
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childStart = 1;
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}
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if (cn == childStart) { // Child is double slash
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if (parent.charAt(pn - 1) == slash)
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return parent.substring(0, pn - 1);
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return parent;
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}
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}
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if (parent.charAt(pn - 1) == slash)
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parentEnd--;
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int strlen = parentEnd + cn - childStart;
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char[] theChars = null;
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if (child.charAt(childStart) == slash) {
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theChars = new char[strlen];
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parent.getChars(0, parentEnd, theChars, 0);
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child.getChars(childStart, cn, theChars, parentEnd);
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} else {
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theChars = new char[strlen + 1];
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parent.getChars(0, parentEnd, theChars, 0);
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theChars[parentEnd] = slash;
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child.getChars(childStart, cn, theChars, parentEnd + 1);
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}
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return new String(theChars);
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}
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@Override
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public String getDefaultParent() {
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return ("" + slash);
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}
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@Override
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public String fromURIPath(String path) {
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String p = path;
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if ((p.length() > 2) && (p.charAt(2) == ':')) {
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// "/c:/foo" --> "c:/foo"
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p = p.substring(1);
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// "c:/foo/" --> "c:/foo", but "c:/" --> "c:/"
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if ((p.length() > 3) && p.endsWith("/"))
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p = p.substring(0, p.length() - 1);
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} else if ((p.length() > 1) && p.endsWith("/")) {
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// "/foo/" --> "/foo"
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p = p.substring(0, p.length() - 1);
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}
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return p;
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}
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/* -- Path operations -- */
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@Override
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public boolean isAbsolute(File f) {
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int pl = f.getPrefixLength();
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return (((pl == 2) && (f.getPath().charAt(0) == slash))
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|| (pl == 3));
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}
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@Override
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public String resolve(File f) {
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String path = f.getPath();
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int pl = f.getPrefixLength();
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if ((pl == 2) && (path.charAt(0) == slash))
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return path; /* UNC */
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if (pl == 3)
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return path; /* Absolute local */
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if (pl == 0)
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return getUserPath() + slashify(path); /* Completely relative */
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if (pl == 1) { /* Drive-relative */
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String up = getUserPath();
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String ud = getDrive(up);
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if (ud != null) return ud + path;
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return up + path; /* User dir is a UNC path */
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}
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if (pl == 2) { /* Directory-relative */
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String up = getUserPath();
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String ud = getDrive(up);
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if ((ud != null) && path.startsWith(ud))
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return up + slashify(path.substring(2));
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char drive = path.charAt(0);
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String dir = getDriveDirectory(drive);
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String np;
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if (dir != null) {
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/* When resolving a directory-relative path that refers to a
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drive other than the current drive, insist that the caller
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have read permission on the result */
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String p = drive + (':' + dir + slashify(path.substring(2)));
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SecurityManager security = System.getSecurityManager();
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try {
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if (security != null) security.checkRead(p);
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} catch (SecurityException x) {
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/* Don't disclose the drive's directory in the exception */
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throw new SecurityException("Cannot resolve path " + path);
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}
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return p;
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}
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return drive + ":" + slashify(path.substring(2)); /* fake it */
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}
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throw new InternalError("Unresolvable path: " + path);
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}
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private String getUserPath() {
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/* For both compatibility and security,
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we must look this up every time */
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return normalize(System.getProperty("user.dir"));
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}
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private String getDrive(String path) {
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int pl = prefixLength(path);
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return (pl == 3) ? path.substring(0, 2) : null;
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}
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private static String[] driveDirCache = new String[26];
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private static int driveIndex(char d) {
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if ((d >= 'a') && (d <= 'z')) return d - 'a';
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if ((d >= 'A') && (d <= 'Z')) return d - 'A';
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return -1;
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}
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private native String getDriveDirectory(int drive);
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private String getDriveDirectory(char drive) {
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int i = driveIndex(drive);
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if (i < 0) return null;
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String s = driveDirCache[i];
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if (s != null) return s;
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s = getDriveDirectory(i + 1);
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driveDirCache[i] = s;
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return s;
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}
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// Caches for canonicalization results to improve startup performance.
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// The first cache handles repeated canonicalizations of the same path
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// name. The prefix cache handles repeated canonicalizations within the
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// same directory, and must not create results differing from the true
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// canonicalization algorithm in canonicalize_md.c. For this reason the
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// prefix cache is conservative and is not used for complex path names.
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private ExpiringCache cache = new ExpiringCache();
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private ExpiringCache prefixCache = new ExpiringCache();
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@Override
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public String canonicalize(String path) throws IOException {
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// If path is a drive letter only then skip canonicalization
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int len = path.length();
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if ((len == 2) &&
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(isLetter(path.charAt(0))) &&
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(path.charAt(1) == ':')) {
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char c = path.charAt(0);
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if ((c >= 'A') && (c <= 'Z'))
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return path;
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return "" + ((char) (c-32)) + ':';
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} else if ((len == 3) &&
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(isLetter(path.charAt(0))) &&
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(path.charAt(1) == ':') &&
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(path.charAt(2) == '\\')) {
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char c = path.charAt(0);
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if ((c >= 'A') && (c <= 'Z'))
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return path;
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return "" + ((char) (c-32)) + ':' + '\\';
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}
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if (!useCanonCaches) {
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return canonicalize0(path);
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} else {
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String res = cache.get(path);
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if (res == null) {
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String dir = null;
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String resDir = null;
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if (useCanonPrefixCache) {
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dir = parentOrNull(path);
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if (dir != null) {
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resDir = prefixCache.get(dir);
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if (resDir != null) {
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/*
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* Hit only in prefix cache; full path is canonical,
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* but we need to get the canonical name of the file
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* in this directory to get the appropriate
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* capitalization
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*/
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String filename = path.substring(1 + dir.length());
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res = canonicalizeWithPrefix(resDir, filename);
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cache.put(dir + File.separatorChar + filename, res);
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}
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}
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}
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if (res == null) {
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res = canonicalize0(path);
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cache.put(path, res);
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if (useCanonPrefixCache && dir != null) {
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resDir = parentOrNull(res);
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if (resDir != null) {
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File f = new File(res);
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if (f.exists() && !f.isDirectory()) {
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prefixCache.put(dir, resDir);
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}
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}
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}
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}
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}
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return res;
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}
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}
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private native String canonicalize0(String path)
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throws IOException;
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private String canonicalizeWithPrefix(String canonicalPrefix,
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String filename) throws IOException
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{
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return canonicalizeWithPrefix0(canonicalPrefix,
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canonicalPrefix + File.separatorChar + filename);
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}
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// Run the canonicalization operation assuming that the prefix
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// (everything up to the last filename) is canonical; just gets
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// the canonical name of the last element of the path
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private native String canonicalizeWithPrefix0(String canonicalPrefix,
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String pathWithCanonicalPrefix)
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throws IOException;
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// Best-effort attempt to get parent of this path; used for
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// optimization of filename canonicalization. This must return null for
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// any cases where the code in canonicalize_md.c would throw an
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// exception or otherwise deal with non-simple pathnames like handling
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// of "." and "..". It may conservatively return null in other
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// situations as well. Returning null will cause the underlying
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// (expensive) canonicalization routine to be called.
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private static String parentOrNull(String path) {
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if (path == null) return null;
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char sep = File.separatorChar;
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char altSep = '/';
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int last = path.length() - 1;
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int idx = last;
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int adjacentDots = 0;
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int nonDotCount = 0;
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while (idx > 0) {
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char c = path.charAt(idx);
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if (c == '.') {
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if (++adjacentDots >= 2) {
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// Punt on pathnames containing . and ..
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return null;
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}
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if (nonDotCount == 0) {
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// Punt on pathnames ending in a .
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return null;
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}
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} else if (c == sep) {
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if (adjacentDots == 1 && nonDotCount == 0) {
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// Punt on pathnames containing . and ..
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return null;
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}
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if (idx == 0 ||
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idx >= last - 1 ||
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path.charAt(idx - 1) == sep ||
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path.charAt(idx - 1) == altSep) {
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// Punt on pathnames containing adjacent slashes
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// toward the end
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return null;
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}
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return path.substring(0, idx);
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} else if (c == altSep) {
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// Punt on pathnames containing both backward and
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// forward slashes
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return null;
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} else if (c == '*' || c == '?') {
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// Punt on pathnames containing wildcards
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return null;
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} else {
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++nonDotCount;
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adjacentDots = 0;
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}
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--idx;
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}
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return null;
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}
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/* -- Attribute accessors -- */
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@Override
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public native int getBooleanAttributes(File f);
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@Override
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public native boolean checkAccess(File f, int access);
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@Override
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public native long getLastModifiedTime(File f);
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@Override
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public native long getLength(File f);
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@Override
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public native boolean setPermission(File f, int access, boolean enable,
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boolean owneronly);
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|
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/* -- File operations -- */
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@Override
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public native boolean createFileExclusively(String path)
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|
throws IOException;
|
|
|
|
@Override
|
|
public native String[] list(File f);
|
|
|
|
@Override
|
|
public native boolean createDirectory(File f);
|
|
|
|
@Override
|
|
public native boolean setLastModifiedTime(File f, long time);
|
|
|
|
@Override
|
|
public native boolean setReadOnly(File f);
|
|
|
|
@Override
|
|
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();
|
|
prefixCache.clear();
|
|
return delete0(f);
|
|
}
|
|
|
|
private native boolean delete0(File f);
|
|
|
|
@Override
|
|
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();
|
|
prefixCache.clear();
|
|
return rename0(f1, f2);
|
|
}
|
|
|
|
private native boolean rename0(File f1, File f2);
|
|
|
|
/* -- Filesystem interface -- */
|
|
|
|
@Override
|
|
public File[] listRoots() {
|
|
int ds = listRoots0();
|
|
int n = 0;
|
|
for (int i = 0; i < 26; i++) {
|
|
if (((ds >> i) & 1) != 0) {
|
|
if (!access((char)('A' + i) + ":" + slash))
|
|
ds &= ~(1 << i);
|
|
else
|
|
n++;
|
|
}
|
|
}
|
|
File[] fs = new File[n];
|
|
int j = 0;
|
|
char slash = this.slash;
|
|
for (int i = 0; i < 26; i++) {
|
|
if (((ds >> i) & 1) != 0)
|
|
fs[j++] = new File((char)('A' + i) + ":" + slash);
|
|
}
|
|
return fs;
|
|
}
|
|
|
|
private static native int listRoots0();
|
|
|
|
private boolean access(String path) {
|
|
try {
|
|
SecurityManager security = System.getSecurityManager();
|
|
if (security != null) security.checkRead(path);
|
|
return true;
|
|
} catch (SecurityException x) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
/* -- Disk usage -- */
|
|
|
|
@Override
|
|
public long getSpace(File f, int t) {
|
|
if (f.exists()) {
|
|
return getSpace0(f, t);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
private native long getSpace0(File f, int t);
|
|
|
|
/* -- Basic infrastructure -- */
|
|
|
|
@Override
|
|
public int compare(File f1, File f2) {
|
|
return f1.getPath().compareToIgnoreCase(f2.getPath());
|
|
}
|
|
|
|
@Override
|
|
public int hashCode(File f) {
|
|
/* Could make this more efficient: String.hashCodeIgnoreCase */
|
|
return f.getPath().toLowerCase(Locale.ENGLISH).hashCode() ^ 1234321;
|
|
}
|
|
|
|
private static native void initIDs();
|
|
|
|
static {
|
|
initIDs();
|
|
}
|
|
}
|