| /* |
| * 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(); |
| } |
| |
| } |