/*
* Copyright (c) 2008, 2013, 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.Path;
import java.io.File;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Arrays;
/**
* Unix specific Path <--> URI conversion
*/
class UnixUriUtils {
private UnixUriUtils() { }
/**
* Converts URI to Path
*/
static Path fromUri(UnixFileSystem fs, URI uri) {
if (!uri.isAbsolute())
throw new IllegalArgumentException("URI is not absolute");
if (uri.isOpaque())
throw new IllegalArgumentException("URI is not hierarchical");
String scheme = uri.getScheme();
if ((scheme == null) || !scheme.equalsIgnoreCase("file"))
throw new IllegalArgumentException("URI scheme is not \"file\"");
if (uri.getRawAuthority() != null)
throw new IllegalArgumentException("URI has an authority component");
if (uri.getRawFragment() != null)
throw new IllegalArgumentException("URI has a fragment component");
if (uri.getRawQuery() != null)
throw new IllegalArgumentException("URI has a query component");
// compatibility with java.io.File
if (!uri.toString().startsWith("file:///"))
return new File(uri).toPath();
// transformation use raw path
String p = uri.getRawPath();
int len = p.length();
if (len == 0)
throw new IllegalArgumentException("URI path component is empty");
// transform escaped octets and unescaped characters to bytes
if (p.endsWith("/") && len > 1)
len--;
byte[] result = new byte[len];
int rlen = 0;
int pos = 0;
while (pos < len) {
char c = p.charAt(pos++);
byte b;
if (c == '%') {
assert (pos+2) <= len;
char c1 = p.charAt(pos++);
char c2 = p.charAt(pos++);
b = (byte)((decode(c1) << 4) | decode(c2));
if (b == 0)
throw new IllegalArgumentException("Nul character not allowed");
} else {
assert c < 0x80;
b = (byte)c;
}
result[rlen++] = b;
}
if (rlen != result.length)
result = Arrays.copyOf(result, rlen);
return new UnixPath(fs, result);
}
/**
* Converts Path to URI
*/
static URI toUri(UnixPath up) {
byte[] path = up.toAbsolutePath().asByteArray();
StringBuilder sb = new StringBuilder("file:///");
assert path[0] == '/';
for (int i=1; i<path.length; i++) {
char c = (char)(path[i] & 0xff);
if (match(c, L_PATH, H_PATH)) {
sb.append(c);
} else {
sb.append('%');
sb.append(hexDigits[(c >> 4) & 0x0f]);
sb.append(hexDigits[(c) & 0x0f]);
}
}
// trailing slash if directory
if (sb.charAt(sb.length()-1) != '/') {
int mode = UnixNativeDispatcher.stat(up);
if ((mode & UnixConstants.S_IFMT) == UnixConstants.S_IFDIR)
sb.append('/');
}
try {
return new URI(sb.toString());
} catch (URISyntaxException x) {
throw new AssertionError(x); // should not happen
}
}
// The following is copied from java.net.URI
// Compute the low-order mask for the characters in the given string
private static long lowMask(String chars) {
int n = chars.length();
long m = 0;
for (int i = 0; i < n; i++) {
char c = chars.charAt(i);
if (c < 64)
m |= (1L << c);
}
return m;
}
// Compute the high-order mask for the characters in the given string
private static long highMask(String chars) {
int n = chars.length();
long m = 0;
for (int i = 0; i < n; i++) {
char c = chars.charAt(i);
if ((c >= 64) && (c < 128))
m |= (1L << (c - 64));
}
return m;
}
// Compute a low-order mask for the characters
// between first and last, inclusive
private static long lowMask(char first, char last) {
long m = 0;
int f = Math.max(Math.min(first, 63), 0);
int l = Math.max(Math.min(last, 63), 0);
for (int i = f; i <= l; i++)
m |= 1L << i;
return m;
}
// Compute a high-order mask for the characters
// between first and last, inclusive
private static long highMask(char first, char last) {
long m = 0;
int f = Math.max(Math.min(first, 127), 64) - 64;
int l = Math.max(Math.min(last, 127), 64) - 64;
for (int i = f; i <= l; i++)
m |= 1L << i;
return m;
}
// Tell whether the given character is permitted by the given mask pair
private static boolean match(char c, long lowMask, long highMask) {
if (c < 64)
return ((1L << c) & lowMask) != 0;
if (c < 128)
return ((1L << (c - 64)) & highMask) != 0;
return false;
}
// decode
private static int decode(char c) {
if ((c >= '0') && (c <= '9'))
return c - '0';
if ((c >= 'a') && (c <= 'f'))
return c - 'a' + 10;
if ((c >= 'A') && (c <= 'F'))
return c - 'A' + 10;
throw new AssertionError();
}
// digit = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" |
// "8" | "9"
private static final long L_DIGIT = lowMask('0', '9');
private static final long H_DIGIT = 0L;
// upalpha = "A" | "B" | "C" | "D" | "E" | "F" | "G" | "H" | "I" |
// "J" | "K" | "L" | "M" | "N" | "O" | "P" | "Q" | "R" |
// "S" | "T" | "U" | "V" | "W" | "X" | "Y" | "Z"
private static final long L_UPALPHA = 0L;
private static final long H_UPALPHA = highMask('A', 'Z');
// lowalpha = "a" | "b" | "c" | "d" | "e" | "f" | "g" | "h" | "i" |
// "j" | "k" | "l" | "m" | "n" | "o" | "p" | "q" | "r" |
// "s" | "t" | "u" | "v" | "w" | "x" | "y" | "z"
private static final long L_LOWALPHA = 0L;
private static final long H_LOWALPHA = highMask('a', 'z');
// alpha = lowalpha | upalpha
private static final long L_ALPHA = L_LOWALPHA | L_UPALPHA;
private static final long H_ALPHA = H_LOWALPHA | H_UPALPHA;
// alphanum = alpha | digit
private static final long L_ALPHANUM = L_DIGIT | L_ALPHA;
private static final long H_ALPHANUM = H_DIGIT | H_ALPHA;
// mark = "-" | "_" | "." | "!" | "~" | "*" | "'" |
// "(" | ")"
private static final long L_MARK = lowMask("-_.!~*'()");
private static final long H_MARK = highMask("-_.!~*'()");
// unreserved = alphanum | mark
private static final long L_UNRESERVED = L_ALPHANUM | L_MARK;
private static final long H_UNRESERVED = H_ALPHANUM | H_MARK;
// pchar = unreserved | escaped |
// ":" | "@" | "&" | "=" | "+" | "$" | ","
private static final long L_PCHAR
= L_UNRESERVED | lowMask(":@&=+$,");
private static final long H_PCHAR
= H_UNRESERVED | highMask(":@&=+$,");
// All valid path characters
private static final long L_PATH = L_PCHAR | lowMask(";/");
private static final long H_PATH = H_PCHAR | highMask(";/");
private static final char[] hexDigits = {
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
};
}