1 /*

     2  * Copyright (c) 2009, 2017, Oracle and/or its affiliates. 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.  Oracle designates this

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

     9  * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package jdk.nio.zipfs;

    27 

    28 import java.nio.ByteBuffer;

    29 import java.nio.CharBuffer;

    30 import java.nio.charset.Charset;

    31 import java.nio.charset.CharsetDecoder;

    32 import java.nio.charset.CharsetEncoder;

    33 import java.nio.charset.CoderResult;

    34 import java.nio.charset.CodingErrorAction;

    35 import java.util.Arrays;

    36 

    37 import static java.nio.charset.StandardCharsets.UTF_8;

    38 import static java.nio.charset.StandardCharsets.ISO_8859_1;

    39 

    40 /**

    41  * Utility class for zipfile name and comment decoding and encoding

    42  *

    43  * @author  Xueming Shen

    44  */

    45 

    46 class ZipCoder {

    47 

    48     static class UTF8 extends ZipCoder {

    49         UTF8() {

    50             super(UTF_8);

    51         }

    52 

    53         @Override

    54         byte[] getBytes(String s) {        // fast pass for ascii

    55             for (int i = 0; i < s.length(); i++) {

    56                 if (s.charAt(i) > 0x7f) return super.getBytes(s);

    57             }

    58             return s.getBytes(ISO_8859_1);

    59         }

    60 

    61         @Override

    62         String toString(byte[] ba) {

    63             for (byte b : ba) {

    64                 if (b < 0) return super.toString(ba);

    65             }

    66             return new String(ba, ISO_8859_1);

    67         }

    68     }

    69 

    70     private static final ZipCoder utf8 = new UTF8();

    71 

    72     public static ZipCoder get(String csn) {

    73         Charset cs = Charset.forName(csn);

    74         if (cs.name().equals("UTF-8")) {

    75             return utf8;

    76         }

    77         return new ZipCoder(cs);

    78     }

    79 

    80     String toString(byte[] ba) {

    81         CharsetDecoder cd = decoder().reset();

    82         int clen = (int)(ba.length * cd.maxCharsPerByte());

    83         char[] ca = new char[clen];

    84         if (clen == 0)

    85             return new String(ca);

    86         ByteBuffer bb = ByteBuffer.wrap(ba, 0, ba.length);

    87         CharBuffer cb = CharBuffer.wrap(ca);

    88         CoderResult cr = cd.decode(bb, cb, true);

    89         if (!cr.isUnderflow())

    90             throw new IllegalArgumentException(cr.toString());

    91         cr = cd.flush(cb);

    92         if (!cr.isUnderflow())

    93             throw new IllegalArgumentException(cr.toString());

    94         return new String(ca, 0, cb.position());

    95     }

    96 

    97     byte[] getBytes(String s) {

    98         CharsetEncoder ce = encoder().reset();

    99         char[] ca = s.toCharArray();

   100         int len = (int)(ca.length * ce.maxBytesPerChar());

   101         byte[] ba = new byte[len];

   102         if (len == 0)

   103             return ba;

   104         ByteBuffer bb = ByteBuffer.wrap(ba);

   105         CharBuffer cb = CharBuffer.wrap(ca);

   106         CoderResult cr = ce.encode(cb, bb, true);

   107         if (!cr.isUnderflow())

   108             throw new IllegalArgumentException(cr.toString());

   109         cr = ce.flush(bb);

   110         if (!cr.isUnderflow())

   111             throw new IllegalArgumentException(cr.toString());

   112         if (bb.position() == ba.length)  // defensive copy?

   113             return ba;

   114         else

   115             return Arrays.copyOf(ba, bb.position());

   116     }

   117 

   118     boolean isUTF8() {

   119         return cs == UTF_8;

   120     }

   121 

   122     private Charset cs;

   123 

   124     private ZipCoder(Charset cs) {

   125         this.cs = cs;

   126     }

   127 

   128     private final ThreadLocal<CharsetDecoder> decTL = new ThreadLocal<>();

   129     private final ThreadLocal<CharsetEncoder> encTL = new ThreadLocal<>();

   130 

   131     private CharsetDecoder decoder() {

   132         CharsetDecoder dec = decTL.get();

   133         if (dec == null) {

   134         dec = cs.newDecoder()

   135             .onMalformedInput(CodingErrorAction.REPORT)

   136             .onUnmappableCharacter(CodingErrorAction.REPORT);

   137         decTL.set(dec);

   138         }

   139         return dec;

   140     }

   141 

   142     private CharsetEncoder encoder() {

   143         CharsetEncoder enc = encTL.get();

   144         if (enc == null) {

   145         enc = cs.newEncoder()

   146             .onMalformedInput(CodingErrorAction.REPORT)

   147             .onUnmappableCharacter(CodingErrorAction.REPORT);

   148         encTL.set(enc);

   149         }

   150         return enc;

   151     }

   152 }