1 /* 2 * Copyright (c) 2009, 2011, 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.StandardCharsets; 32 import java.nio.charset.CharsetDecoder; 33 import java.nio.charset.CharsetEncoder; 34 import java.nio.charset.CoderResult; 35 import java.nio.charset.CodingErrorAction; 36 import java.util.Arrays; 37 import sun.nio.cs.ArrayDecoder; 38 import sun.nio.cs.ArrayEncoder; 39 40 /** 41 * Utility class for zipfile name and comment decoding and encoding 42 */ 43 44 final class ZipCoder { 45 46 String toString(byte[] ba, int length) { 47 CharsetDecoder cd = decoder().reset(); 48 int len = (int)(length * cd.maxCharsPerByte()); 49 char[] ca = new char[len]; 50 if (len == 0) 51 return new String(ca); 52 // UTF-8 only for now. Other ArrayDeocder only handles 53 // CodingErrorAction.REPLACE mode. ZipCoder uses 54 // REPORT mode. 55 if (isUTF8 && cd instanceof ArrayDecoder) { 56 int clen = ((ArrayDecoder)cd).decode(ba, 0, length, ca); 57 if (clen == -1) // malformed 58 throw new IllegalArgumentException("MALFORMED"); 59 return new String(ca, 0, clen); 60 } 61 ByteBuffer bb = ByteBuffer.wrap(ba, 0, length); 62 CharBuffer cb = CharBuffer.wrap(ca); 63 CoderResult cr = cd.decode(bb, cb, true); 64 if (!cr.isUnderflow()) 65 throw new IllegalArgumentException(cr.toString()); 66 cr = cd.flush(cb); 67 if (!cr.isUnderflow()) 68 throw new IllegalArgumentException(cr.toString()); 69 return new String(ca, 0, cb.position()); 70 } 71 72 String toString(byte[] ba) { 73 return toString(ba, ba.length); 74 } 75 76 byte[] getBytes(String s) { 77 CharsetEncoder ce = encoder().reset(); 78 char[] ca = s.toCharArray(); 79 int len = (int)(ca.length * ce.maxBytesPerChar()); 80 byte[] ba = new byte[len]; 81 if (len == 0) 82 return ba; 83 // UTF-8 only for now. Other ArrayDeocder only handles 84 // CodingErrorAction.REPLACE mode. 85 if (isUTF8 && ce instanceof ArrayEncoder) { 86 int blen = ((ArrayEncoder)ce).encode(ca, 0, ca.length, ba); 87 if (blen == -1) // malformed 88 throw new IllegalArgumentException("MALFORMED"); 89 return Arrays.copyOf(ba, blen); 90 } 91 ByteBuffer bb = ByteBuffer.wrap(ba); 92 CharBuffer cb = CharBuffer.wrap(ca); 93 CoderResult cr = ce.encode(cb, bb, true); 94 if (!cr.isUnderflow()) 95 throw new IllegalArgumentException(cr.toString()); 96 cr = ce.flush(bb); 97 if (!cr.isUnderflow()) 98 throw new IllegalArgumentException(cr.toString()); 99 if (bb.position() == ba.length) // defensive copy? 100 return ba; 101 else 102 return Arrays.copyOf(ba, bb.position()); 103 } 104 105 // assume invoked only if "this" is not utf8 106 byte[] getBytesUTF8(String s) { 107 if (isUTF8) 108 return getBytes(s); 109 if (utf8 == null) 110 utf8 = new ZipCoder(StandardCharsets.UTF_8); 111 return utf8.getBytes(s); 112 } 113 114 115 String toStringUTF8(byte[] ba, int len) { 116 if (isUTF8) 117 return toString(ba, len); 118 if (utf8 == null) 119 utf8 = new ZipCoder(StandardCharsets.UTF_8); 120 return utf8.toString(ba, len); 121 } 122 123 boolean isUTF8() { 124 return isUTF8; 125 } 126 127 private Charset cs; 128 private CharsetDecoder dec; 129 private CharsetEncoder enc; 130 private boolean isUTF8; 131 private ZipCoder utf8; 132 133 private ZipCoder(Charset cs) { 134 this.cs = cs; 135 this.isUTF8 = cs.name().equals(StandardCharsets.UTF_8.name()); 136 } 137 138 static ZipCoder get(Charset charset) { 139 return new ZipCoder(charset); 140 } 141 142 private CharsetDecoder decoder() { 143 if (dec == null) { 144 dec = cs.newDecoder() 145 .onMalformedInput(CodingErrorAction.REPORT) 146 .onUnmappableCharacter(CodingErrorAction.REPORT); 147 } 148 return dec; 149 } 150 151 private CharsetEncoder encoder() { 152 if (enc == null) { 153 enc = cs.newEncoder() 154 .onMalformedInput(CodingErrorAction.REPORT) 155 .onUnmappableCharacter(CodingErrorAction.REPORT); 156 } 157 return enc; 158 } 159 } 160
