2009-04-16 21:00:42 -07:00
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/*
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2020-04-22 21:13:10 +02:00
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* Copyright (c) 2009, 2020, Oracle and/or its affiliates. All rights reserved.
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2009-04-16 21:00:42 -07:00
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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2010-05-25 15:58:33 -07:00
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* published by the Free Software Foundation. Oracle designates this
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2009-04-16 21:00:42 -07:00
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* particular file as subject to the "Classpath" exception as provided
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2010-05-25 15:58:33 -07:00
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* by Oracle in the LICENSE file that accompanied this code.
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2009-04-16 21:00:42 -07:00
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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2010-05-25 15:58:33 -07:00
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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2009-04-16 21:00:42 -07:00
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*/
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package java.util.zip;
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import java.nio.ByteBuffer;
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import java.nio.CharBuffer;
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import java.nio.charset.Charset;
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import java.nio.charset.CharsetDecoder;
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import java.nio.charset.CharsetEncoder;
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import java.nio.charset.CharacterCodingException;
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import java.nio.charset.CodingErrorAction;
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2019-12-01 15:29:37 -08:00
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import sun.nio.cs.UTF_8;
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2009-04-16 21:00:42 -07:00
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/**
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* Utility class for zipfile name and comment decoding and encoding
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*/
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class ZipCoder {
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2018-11-06 10:01:16 -08:00
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private static final jdk.internal.access.JavaLangAccess JLA =
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jdk.internal.access.SharedSecrets.getJavaLangAccess();
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2020-04-22 21:13:10 +02:00
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static final class UTF8ZipCoder extends ZipCoder {
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// Encoding/decoding is stateless, so make it singleton.
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static final ZipCoder INSTANCE = new UTF8ZipCoder(UTF_8.INSTANCE);
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2009-04-16 21:00:42 -07:00
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2020-04-22 21:13:10 +02:00
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private UTF8ZipCoder(Charset utf8) {
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super(utf8);
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}
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@Override
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boolean isUTF8() {
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return true;
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}
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@Override
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String toString(byte[] ba, int off, int length) {
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return JLA.newStringUTF8NoRepl(ba, off, length);
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}
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@Override
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byte[] getBytes(String s) {
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return JLA.getBytesUTF8NoRepl(s);
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}
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2020-04-22 21:13:10 +02:00
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@Override
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int hashN(byte[] a, int off, int len) {
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// Performance optimization: when UTF8-encoded, ZipFile.getEntryPos
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// assume that the hash of a name remains unchanged when appending a
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// trailing '/', which allows lookups to avoid rehashing
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int end = off + len;
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if (len > 0 && a[end - 1] == '/') {
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end--;
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}
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int h = 1;
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for (int i = off; i < end; i++) {
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h = 31 * h + a[i];
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}
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return h;
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}
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}
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public static ZipCoder get(Charset charset) {
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if (charset == UTF_8.INSTANCE)
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return UTF8ZipCoder.INSTANCE;
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return new ZipCoder(charset);
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}
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String toString(byte[] ba, int off, int length) {
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try {
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return decoder().decode(ByteBuffer.wrap(ba, off, length)).toString();
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} catch (CharacterCodingException x) {
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throw new IllegalArgumentException(x);
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}
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}
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2015-12-14 09:27:15 -08:00
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String toString(byte[] ba, int length) {
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return toString(ba, 0, length);
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}
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String toString(byte[] ba) {
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return toString(ba, 0, ba.length);
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}
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byte[] getBytes(String s) {
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try {
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ByteBuffer bb = encoder().encode(CharBuffer.wrap(s));
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int pos = bb.position();
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int limit = bb.limit();
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if (bb.hasArray() && pos == 0 && limit == bb.capacity()) {
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return bb.array();
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}
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byte[] bytes = new byte[bb.limit() - bb.position()];
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bb.get(bytes);
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return bytes;
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} catch (CharacterCodingException x) {
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throw new IllegalArgumentException(x);
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}
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}
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// assume invoked only if "this" is not utf8
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byte[] getBytesUTF8(String s) {
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return UTF8ZipCoder.INSTANCE.getBytes(s);
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}
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String toStringUTF8(byte[] ba, int len) {
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return UTF8ZipCoder.INSTANCE.toString(ba, 0, len);
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}
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String toStringUTF8(byte[] ba, int off, int len) {
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return UTF8ZipCoder.INSTANCE.toString(ba, off, len);
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}
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boolean isUTF8() {
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return false;
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}
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2020-04-22 21:13:10 +02:00
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int hashN(byte[] a, int off, int len) {
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int h = 1;
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while (len-- > 0) {
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h = 31 * h + a[off++];
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}
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return h;
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}
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private Charset cs;
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private CharsetDecoder dec;
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private CharsetEncoder enc;
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private ZipCoder(Charset cs) {
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this.cs = cs;
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}
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2020-04-22 21:13:10 +02:00
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private CharsetDecoder decoder() {
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if (dec == null) {
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dec = cs.newDecoder()
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.onMalformedInput(CodingErrorAction.REPORT)
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.onUnmappableCharacter(CodingErrorAction.REPORT);
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}
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return dec;
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}
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2020-04-22 21:13:10 +02:00
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private CharsetEncoder encoder() {
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if (enc == null) {
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enc = cs.newEncoder()
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.onMalformedInput(CodingErrorAction.REPORT)
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.onUnmappableCharacter(CodingErrorAction.REPORT);
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}
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return enc;
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}
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}
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