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 java.util.zip;
  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.CharacterCodingException;
  34 import java.nio.charset.CodingErrorAction;
  35 
  36 import static java.nio.charset.StandardCharsets.UTF_8;
  37 
  38 /**
  39  * Utility class for zipfile name and comment decoding and encoding
  40  */
  41 
  42 class ZipCoder {
  43 
  44     private static final jdk.internal.misc.JavaLangAccess JLA =
  45         jdk.internal.misc.SharedSecrets.getJavaLangAccess();
  46 
  47     static final class UTF8 extends ZipCoder {
  48 
  49         UTF8(Charset utf8) {
  50             super(utf8);
  51         }
  52 
  53         @Override
  54         boolean isUTF8() {
  55             return true;
  56         }
  57 
  58         @Override
  59         String toString(byte[] ba, int off, int length) {
  60             return JLA.newStringUTF8NoRepl(ba, off, length);
  61         }
  62 
  63         @Override
  64         byte[] getBytes(String s) {
  65             return JLA.getBytesUTF8NoRepl(s);
  66         }
  67     }
  68 
  69     // UTF_8.ArrayEn/Decoder is stateless, so make it singleton.
  70     private static ZipCoder utf8 = new UTF8(UTF_8);
  71 
  72     public static ZipCoder get(Charset charset) {
  73         if (charset == UTF_8)
  74             return utf8;
  75         return new ZipCoder(charset);
  76     }
  77 
  78     String toString(byte[] ba, int off, int length) {
  79         try {
  80               return decoder().decode(ByteBuffer.wrap(ba, off, length)).toString();
  81 
  82         } catch (CharacterCodingException x) {
  83             throw new IllegalArgumentException(x);
  84         }
  85     }
  86 
  87     String toString(byte[] ba, int length) {
  88         return toString(ba, 0, length);
  89     }
  90 
  91     String toString(byte[] ba) {
  92         return toString(ba, 0, ba.length);
  93     }
  94 
  95     byte[] getBytes(String s) {
  96         try {
  97             ByteBuffer bb = encoder().encode(CharBuffer.wrap(s));
  98             int pos = bb.position();
  99             int limit = bb.limit();
 100             if (bb.hasArray() && pos == 0 && limit == bb.capacity()) {
 101                 return bb.array();
 102             }
 103             byte[] bytes = new byte[bb.limit() - bb.position()];
 104             bb.get(bytes);
 105             return bytes;
 106         } catch (CharacterCodingException x) {
 107             throw new IllegalArgumentException(x);
 108         }
 109     }
 110 
 111     // assume invoked only if "this" is not utf8
 112     byte[] getBytesUTF8(String s) {
 113         return utf8.getBytes(s);
 114     }
 115 
 116     String toStringUTF8(byte[] ba, int len) {
 117         return utf8.toString(ba, 0, len);
 118     }
 119 
 120     String toStringUTF8(byte[] ba, int off, int len) {
 121         return utf8.toString(ba, off, len);
 122     }
 123 
 124     boolean isUTF8() {
 125         return false;
 126     }
 127 
 128     private Charset cs;
 129     private CharsetDecoder dec;
 130     private CharsetEncoder enc;
 131 
 132     private ZipCoder(Charset cs) {
 133         this.cs = cs;
 134     }
 135 
 136     protected CharsetDecoder decoder() {
 137         if (dec == null) {
 138             dec = cs.newDecoder()
 139               .onMalformedInput(CodingErrorAction.REPORT)
 140               .onUnmappableCharacter(CodingErrorAction.REPORT);
 141         }
 142         return dec;
 143     }
 144 
 145     protected CharsetEncoder encoder() {
 146         if (enc == null) {
 147             enc = cs.newEncoder()
 148               .onMalformedInput(CodingErrorAction.REPORT)
 149               .onUnmappableCharacter(CodingErrorAction.REPORT);
 150         }
 151         return enc;
 152     }
 153 }