1 /*

     2  * Copyright 2008-2009 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    25 

    26 package sun.nio.fs;

    27 

    28 import java.net.URI;

    29 import java.net.URISyntaxException;

    30 

    31 /**

    32  * Unix specific Path <--> URI conversion

    33  */

    34 

    35 class UnixUriUtils {

    36     private UnixUriUtils() { }

    37 

    38     /**

    39      * Converts URI to Path

    40      */

    41     static UnixPath fromUri(UnixFileSystem fs, URI uri) {

    42         if (!uri.isAbsolute())

    43             throw new IllegalArgumentException("URI is not absolute");

    44         if (uri.isOpaque())

    45             throw new IllegalArgumentException("URI is not hierarchical");

    46         String scheme = uri.getScheme();

    47         if ((scheme == null) || !scheme.equalsIgnoreCase("file"))

    48             throw new IllegalArgumentException("URI scheme is not \"file\"");

    49         if (uri.getAuthority() != null)

    50             throw new IllegalArgumentException("URI has an authority component");

    51         if (uri.getFragment() != null)

    52             throw new IllegalArgumentException("URI has a fragment component");

    53         if (uri.getQuery() != null)

    54             throw new IllegalArgumentException("URI has a query component");

    55 

    56         String path = uri.getPath();

    57         if (path.equals(""))

    58             throw new IllegalArgumentException("URI path component is empty");

    59         if (path.endsWith("/") && (path.length() > 1)) {

    60             // "/foo/" --> "/foo", but "/" --> "/"

    61             path = path.substring(0, path.length() - 1);

    62         }

    63 

    64         // preserve bytes

    65         byte[] result = new byte[path.length()];

    66         for (int i=0; i<path.length(); i++) {

    67             byte v = (byte)(path.charAt(i));

    68             if (v == 0)

    69                 throw new IllegalArgumentException("Nul character not allowed");

    70             result[i] = v;

    71         }

    72         return new UnixPath(fs, result);

    73     }

    74 

    75     /**

    76      * Converts Path to URI

    77      */

    78     static URI toUri(UnixPath up) {

    79         byte[] path = up.toAbsolutePath().asByteArray();

    80         StringBuilder sb = new StringBuilder("file:///");

    81         assert path[0] == '/';

    82         for (int i=1; i<path.length; i++) {

    83             char c = (char)(path[i] & 0xff);

    84             if (match(c, L_PATH, H_PATH)) {

    85                 sb.append(c);

    86             } else {

    87                sb.append('%');

    88                sb.append(hexDigits[(c >> 4) & 0x0f]);

    89                sb.append(hexDigits[(c >> 0) & 0x0f]);

    90             }

    91         }

    92 

    93         // trailing slash if directory

    94         if (sb.charAt(sb.length()-1) != '/') {

    95             try {

    96                  if (UnixFileAttributes.get(up, true).isDirectory())

    97                      sb.append('/');

    98             } catch (UnixException x) {

    99                 // ignore

   100             }

   101         }

   102 

   103         try {

   104             return new URI(sb.toString());

   105         } catch (URISyntaxException x) {

   106             throw new AssertionError(x);  // should not happen

   107         }

   108     }

   109 

   110     // The following is copied from java.net.URI

   111 

   112     // Compute the low-order mask for the characters in the given string

   113     private static long lowMask(String chars) {

   114         int n = chars.length();

   115         long m = 0;

   116         for (int i = 0; i < n; i++) {

   117             char c = chars.charAt(i);

   118             if (c < 64)

   119                 m |= (1L << c);

   120         }

   121         return m;

   122     }

   123 

   124     // Compute the high-order mask for the characters in the given string

   125     private static long highMask(String chars) {

   126         int n = chars.length();

   127         long m = 0;

   128         for (int i = 0; i < n; i++) {

   129             char c = chars.charAt(i);

   130             if ((c >= 64) && (c < 128))

   131                 m |= (1L << (c - 64));

   132         }

   133         return m;

   134     }

   135 

   136     // Compute a low-order mask for the characters

   137     // between first and last, inclusive

   138     private static long lowMask(char first, char last) {

   139         long m = 0;

   140         int f = Math.max(Math.min(first, 63), 0);

   141         int l = Math.max(Math.min(last, 63), 0);

   142         for (int i = f; i <= l; i++)

   143             m |= 1L << i;

   144         return m;

   145     }

   146 

   147     // Compute a high-order mask for the characters

   148     // between first and last, inclusive

   149     private static long highMask(char first, char last) {

   150         long m = 0;

   151         int f = Math.max(Math.min(first, 127), 64) - 64;

   152         int l = Math.max(Math.min(last, 127), 64) - 64;

   153         for (int i = f; i <= l; i++)

   154             m |= 1L << i;

   155         return m;

   156     }

   157 

   158     // Tell whether the given character is permitted by the given mask pair

   159     private static boolean match(char c, long lowMask, long highMask) {

   160         if (c < 64)

   161             return ((1L << c) & lowMask) != 0;

   162         if (c < 128)

   163             return ((1L << (c - 64)) & highMask) != 0;

   164         return false;

   165     }

   166 

   167     // digit    = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" |

   168     //            "8" | "9"

   169     private static final long L_DIGIT = lowMask('0', '9');

   170     private static final long H_DIGIT = 0L;

   171 

   172     // upalpha  = "A" | "B" | "C" | "D" | "E" | "F" | "G" | "H" | "I" |

   173     //            "J" | "K" | "L" | "M" | "N" | "O" | "P" | "Q" | "R" |

   174     //            "S" | "T" | "U" | "V" | "W" | "X" | "Y" | "Z"

   175     private static final long L_UPALPHA = 0L;

   176     private static final long H_UPALPHA = highMask('A', 'Z');

   177 

   178     // lowalpha = "a" | "b" | "c" | "d" | "e" | "f" | "g" | "h" | "i" |

   179     //            "j" | "k" | "l" | "m" | "n" | "o" | "p" | "q" | "r" |

   180     //            "s" | "t" | "u" | "v" | "w" | "x" | "y" | "z"

   181     private static final long L_LOWALPHA = 0L;

   182     private static final long H_LOWALPHA = highMask('a', 'z');

   183 

   184     // alpha         = lowalpha | upalpha

   185     private static final long L_ALPHA = L_LOWALPHA | L_UPALPHA;

   186     private static final long H_ALPHA = H_LOWALPHA | H_UPALPHA;

   187 

   188     // alphanum      = alpha | digit

   189     private static final long L_ALPHANUM = L_DIGIT | L_ALPHA;

   190     private static final long H_ALPHANUM = H_DIGIT | H_ALPHA;

   191 

   192     // mark          = "-" | "_" | "." | "!" | "~" | "*" | "'" |

   193     //                 "(" | ")"

   194     private static final long L_MARK = lowMask("-_.!~*'()");

   195     private static final long H_MARK = highMask("-_.!~*'()");

   196 

   197     // unreserved    = alphanum | mark

   198     private static final long L_UNRESERVED = L_ALPHANUM | L_MARK;

   199     private static final long H_UNRESERVED = H_ALPHANUM | H_MARK;

   200 

   201     // pchar         = unreserved | escaped |

   202     //                 ":" | "@" | "&" | "=" | "+" | "$" | ","

   203     private static final long L_PCHAR

   204         = L_UNRESERVED | lowMask(":@&=+$,");

   205     private static final long H_PCHAR

   206         = H_UNRESERVED | highMask(":@&=+$,");

   207 

   208    // All valid path characters

   209    private static final long L_PATH = L_PCHAR | lowMask(";/");

   210    private static final long H_PATH = H_PCHAR | highMask(";/");

   211 

   212    private final static char[] hexDigits = {

   213         '0', '1', '2', '3', '4', '5', '6', '7',

   214         '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'

   215     };

   216 }