/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* Apache Harmony HEADER because the code in this class comes mostly from ZipFile, ZipEntry and
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* ZipConstants from android libcore.
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*/
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package androidx.multidex;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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import java.nio.charset.Charset;
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import java.util.Calendar;
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import java.util.GregorianCalendar;
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import java.util.zip.ZipEntry;
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import java.util.zip.ZipException;
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class ZipEntryReader {
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static final Charset UTF_8 = Charset.forName("UTF-8");
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/**
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* General Purpose Bit Flags, Bit 0.
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* If set, indicates that the file is encrypted.
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*/
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private static final int GPBF_ENCRYPTED_FLAG = 1 << 0;
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/**
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* Supported General Purpose Bit Flags Mask.
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* Bit mask of bits not supported.
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* Note: The only bit that we will enforce at this time
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* is the encrypted bit. Although other bits are not supported,
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* we must not enforce them as this could break some legitimate
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* use cases (See http://b/8617715).
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*/
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private static final int GPBF_UNSUPPORTED_MASK = GPBF_ENCRYPTED_FLAG;
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private static final long CENSIG = 0x2014b50;
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static ZipEntry readEntry(ByteBuffer in) throws IOException {
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int sig = in.getInt();
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if (sig != CENSIG) {
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throw new ZipException("Central Directory Entry not found");
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}
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in.position(8);
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int gpbf = in.getShort() & 0xffff;
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if ((gpbf & GPBF_UNSUPPORTED_MASK) != 0) {
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throw new ZipException("Invalid General Purpose Bit Flag: " + gpbf);
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}
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int compressionMethod = in.getShort() & 0xffff;
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int time = in.getShort() & 0xffff;
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int modDate = in.getShort() & 0xffff;
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// These are 32-bit values in the file, but 64-bit fields in this object.
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long crc = ((long) in.getInt()) & 0xffffffffL;
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long compressedSize = ((long) in.getInt()) & 0xffffffffL;
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long size = ((long) in.getInt()) & 0xffffffffL;
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int nameLength = in.getShort() & 0xffff;
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int extraLength = in.getShort() & 0xffff;
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int commentByteCount = in.getShort() & 0xffff;
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// This is a 32-bit value in the file, but a 64-bit field in this object.
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in.position(42);
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long localHeaderRelOffset = ((long) in.getInt()) & 0xffffffffL;
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byte[] nameBytes = new byte[nameLength];
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in.get(nameBytes, 0, nameBytes.length);
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String name = new String(nameBytes, 0, nameBytes.length, UTF_8);
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ZipEntry entry = new ZipEntry(name);
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entry.setMethod(compressionMethod);
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entry.setTime(getTime(time, modDate));
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entry.setCrc(crc);
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entry.setCompressedSize(compressedSize);
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entry.setSize(size);
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// The RI has always assumed UTF-8. (If GPBF_UTF8_FLAG isn't set, the encoding is
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// actually IBM-437.)
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if (commentByteCount > 0) {
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byte[] commentBytes = new byte[commentByteCount];
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in.get(commentBytes, 0, commentByteCount);
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entry.setComment(new String(commentBytes, 0, commentBytes.length, UTF_8));
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}
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if (extraLength > 0) {
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byte[] extra = new byte[extraLength];
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in.get(extra, 0, extraLength);
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entry.setExtra(extra);
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}
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return entry;
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}
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private static long getTime(int time, int modDate) {
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GregorianCalendar cal = new GregorianCalendar();
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cal.set(Calendar.MILLISECOND, 0);
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cal.set(1980 + ((modDate >> 9) & 0x7f), ((modDate >> 5) & 0xf) - 1,
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modDate & 0x1f, (time >> 11) & 0x1f, (time >> 5) & 0x3f,
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(time & 0x1f) << 1);
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return cal.getTime().getTime();
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}
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}
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