253 lines
8.6 KiB
Java
253 lines
8.6 KiB
Java
/*
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* Copyright (c) 2009, 2021, Oracle and/or its affiliates. All rights reserved.
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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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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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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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* 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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*/
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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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import java.nio.charset.StandardCharsets;
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import java.util.Arrays;
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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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// Android-removed:
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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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// Encoding/decoding is stateless, so make it singleton.
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// Android-changed: use StandardCharsets.
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// static final UTF8ZipCoder UTF8 = new UTF8ZipCoder(UTF_8.INSTANCE);
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static final UTF8ZipCoder UTF8 = new UTF8ZipCoder(StandardCharsets.UTF_8);
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public static ZipCoder get(Charset charset) {
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// Android-changed: use equals method, not reference comparison.
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// if (charset == UTF_8.INSTANCE) {
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if (StandardCharsets.UTF_8.equals(charset)) {
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return UTF8;
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}
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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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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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static String toStringUTF8(byte[] ba, int len) {
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return UTF8.toString(ba, 0, 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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// Hash code functions for ZipFile entry names. We generate the hash as-if
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// we first decoded the byte sequence to a String, then appended '/' if no
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// trailing slash was found, then called String.hashCode(). This
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// normalization ensures we can simplify and speed up lookups.
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//
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// Does encoding error checking and hashing in a single pass for efficiency.
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// On an error, this function will throw CharacterCodingException while the
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// UTF8ZipCoder override will throw IllegalArgumentException, so we declare
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// throws Exception to keep things simple.
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int checkedHash(byte[] a, int off, int len) throws Exception {
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if (len == 0) {
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return 0;
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}
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int h = 0;
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// cb will be a newly allocated CharBuffer with pos == 0,
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// arrayOffset == 0, backed by an array.
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CharBuffer cb = decoder().decode(ByteBuffer.wrap(a, off, len));
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int limit = cb.limit();
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char[] decoded = cb.array();
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for (int i = 0; i < limit; i++) {
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h = 31 * h + decoded[i];
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}
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if (limit > 0 && decoded[limit - 1] != '/') {
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h = 31 * h + '/';
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}
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return h;
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}
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// Hash function equivalent of checkedHash for String inputs
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static int hash(String name) {
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int hsh = name.hashCode();
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int len = name.length();
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if (len > 0 && name.charAt(len - 1) != '/') {
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hsh = hsh * 31 + '/';
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}
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return hsh;
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}
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boolean hasTrailingSlash(byte[] a, int end) {
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byte[] slashBytes = slashBytes();
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return end >= slashBytes.length &&
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Arrays.mismatch(a, end - slashBytes.length, end, slashBytes, 0, slashBytes.length) == -1;
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}
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private byte[] slashBytes;
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private final Charset cs;
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protected 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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protected 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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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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// This method produces an array with the bytes that will correspond to a
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// trailing '/' in the chosen character encoding.
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//
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// While in most charsets a trailing slash will be encoded as the byte
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// value of '/', this does not hold in the general case. E.g., in charsets
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// such as UTF-16 and UTF-32 it will be represented by a sequence of 2 or 4
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// bytes, respectively.
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private byte[] slashBytes() {
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if (slashBytes == null) {
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// Take into account charsets that produce a BOM, e.g., UTF-16
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byte[] slash = "/".getBytes(cs);
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byte[] doubleSlash = "//".getBytes(cs);
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slashBytes = Arrays.copyOfRange(doubleSlash, slash.length, doubleSlash.length);
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}
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return slashBytes;
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}
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static final class UTF8ZipCoder extends ZipCoder {
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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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// Android-changed: JLA is not yet available.
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// return JLA.newStringUTF8NoRepl(ba, off, length);
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return new String(ba, off, length, StandardCharsets.UTF_8);
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}
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@Override
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byte[] getBytes(String s) {
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// Android-changed: JLA is not yet available.
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// return JLA.getBytesUTF8NoRepl(s);
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return s.getBytes(StandardCharsets.UTF_8);
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}
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@Override
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int checkedHash(byte[] a, int off, int len) throws Exception {
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if (len == 0) {
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return 0;
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}
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int end = off + len;
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int h = 0;
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while (off < end) {
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byte b = a[off];
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if (b >= 0) {
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// ASCII, keep going
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h = 31 * h + b;
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off++;
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} else {
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// Non-ASCII, fall back to decoding a String
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// We avoid using decoder() here since the UTF8ZipCoder is
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// shared and that decoder is not thread safe.
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// We use the JLA.newStringUTF8NoRepl variant to throw
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// exceptions eagerly when opening ZipFiles
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// Android-changed: JLA is not yet available.
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// return hash(JLA.newStringUTF8NoRepl(a, end - len, len));
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return hash(new String(a, end - len, len, StandardCharsets.UTF_8));
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}
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}
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if (a[end - 1] != '/') {
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h = 31 * h + '/';
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}
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return h;
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}
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@Override
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boolean hasTrailingSlash(byte[] a, int end) {
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return end > 0 && a[end - 1] == '/';
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}
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}
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}
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