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 }