1 /* 2 * Copyright (c) 2009, 2018, 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.access.JavaLangAccess JLA = 45 jdk.internal.access.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 } catch (CharacterCodingException x) { 82 throw new IllegalArgumentException(x); 83 } 84 } 85 86 String toString(byte[] ba, int length) { 87 return toString(ba, 0, length); 88 } 89 90 String toString(byte[] ba) { 91 return toString(ba, 0, ba.length); 92 } 93 94 byte[] getBytes(String s) { 95 try { 96 ByteBuffer bb = encoder().encode(CharBuffer.wrap(s)); 97 int pos = bb.position(); 98 int limit = bb.limit(); 99 if (bb.hasArray() && pos == 0 && limit == bb.capacity()) { 100 return bb.array(); 101 } 102 byte[] bytes = new byte[bb.limit() - bb.position()]; 103 bb.get(bytes); 104 return bytes; 105 } catch (CharacterCodingException x) { 106 throw new IllegalArgumentException(x); 107 } 108 } 109 110 // assume invoked only if "this" is not utf8 111 byte[] getBytesUTF8(String s) { 112 return utf8.getBytes(s); 113 } 114 115 String toStringUTF8(byte[] ba, int len) { 116 return utf8.toString(ba, 0, len); 117 } 118 119 String toStringUTF8(byte[] ba, int off, int len) { 120 return utf8.toString(ba, off, len); 121 } 122 123 boolean isUTF8() { 124 return false; 125 } 126 127 private Charset cs; 128 private CharsetDecoder dec; 129 private CharsetEncoder enc; 130 131 private ZipCoder(Charset cs) { 132 this.cs = cs; 133 } 134 135 protected CharsetDecoder decoder() { 136 if (dec == null) { 137 dec = cs.newDecoder() 138 .onMalformedInput(CodingErrorAction.REPORT) 139 .onUnmappableCharacter(CodingErrorAction.REPORT); 140 } 141 return dec; 142 } 143 144 protected CharsetEncoder encoder() { 145 if (enc == null) { 146 enc = cs.newEncoder() 147 .onMalformedInput(CodingErrorAction.REPORT) 148 .onUnmappableCharacter(CodingErrorAction.REPORT); 149 } 150 return enc; 151 } 152 }