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