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Apache Commons Compress defines an API for working with
compression and archive formats. These include bzip2, gzip, pack200,
LZMA, XZ, Snappy, traditional Unix Compress, DEFLATE, DEFLATE64, LZ4,
Brotli, Zstandard and ar, cpio, jar, tar, zip, dump, 7z, arj.
/*
* 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.
*/
package org.apache.commons.compress.archivers.zip;
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.Closeable;
import java.io.EOFException;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.SequenceInputStream;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.SeekableByteChannel;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.EnumSet;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.zip.Inflater;
import java.util.zip.ZipException;
import org.apache.commons.compress.archivers.EntryStreamOffsets;
import org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream;
import org.apache.commons.compress.compressors.deflate64.Deflate64CompressorInputStream;
import org.apache.commons.compress.utils.BoundedArchiveInputStream;
import org.apache.commons.compress.utils.BoundedSeekableByteChannelInputStream;
import org.apache.commons.compress.utils.CountingInputStream;
import org.apache.commons.compress.utils.IOUtils;
import org.apache.commons.compress.utils.InputStreamStatistics;
/**
* Replacement for {@code java.util.ZipFile}.
*
* This class adds support for file name encodings other than UTF-8
* (which is required to work on ZIP files created by native ZIP tools
* and is able to skip a preamble like the one found in self
* extracting archives. Furthermore it returns instances of
* {@code org.apache.commons.compress.archivers.zip.ZipArchiveEntry}
* instead of {@code java.util.zip.ZipEntry}.
*
* It doesn't extend {@code java.util.zip.ZipFile} as it would
* have to reimplement all methods anyway. Like
* {@code java.util.ZipFile}, it uses SeekableByteChannel under the
* covers and supports compressed and uncompressed entries. As of
* Apache Commons Compress 1.3 it also transparently supports Zip64
* extensions and thus individual entries and archives larger than 4
* GB or with more than 65536 entries.
*
* The method signatures mimic the ones of
* {@code java.util.zip.ZipFile}, with a couple of exceptions:
*
*
* - There is no getName method.
* - entries has been renamed to getEntries.
* - getEntries and getEntry return
* {@code org.apache.commons.compress.archivers.zip.ZipArchiveEntry}
* instances.
* - close is allowed to throw IOException.
*
*/
public class ZipFile implements Closeable {
/**
* Lock-free implementation of BoundedInputStream. The
* implementation uses positioned reads on the underlying archive
* file channel and therefore performs significantly faster in
* concurrent environment.
*/
private class BoundedFileChannelInputStream extends BoundedArchiveInputStream {
private final FileChannel archive;
BoundedFileChannelInputStream(final long start, final long remaining) {
super(start, remaining);
archive = (FileChannel) ZipFile.this.archive;
}
@Override
protected int read(final long pos, final ByteBuffer buf) throws IOException {
final int read = archive.read(buf, pos);
buf.flip();
return read;
}
}
/**
* Extends ZipArchiveEntry to store the offset within the archive.
*/
private static class Entry extends ZipArchiveEntry {
Entry() {
}
@Override
public boolean equals(final Object other) {
if (super.equals(other)) {
// super.equals would return false if other were not an Entry
final Entry otherEntry = (Entry) other;
return getLocalHeaderOffset()
== otherEntry.getLocalHeaderOffset()
&& super.getDataOffset()
== otherEntry.getDataOffset()
&& super.getDiskNumberStart()
== otherEntry.getDiskNumberStart();
}
return false;
}
@Override
public int hashCode() {
return 3 * super.hashCode()
+ (int) getLocalHeaderOffset()+(int)(getLocalHeaderOffset()>>32);
}
}
private static final class NameAndComment {
private final byte[] name;
private final byte[] comment;
private NameAndComment(final byte[] name, final byte[] comment) {
this.name = name;
this.comment = comment;
}
}
private static class StoredStatisticsStream extends CountingInputStream implements InputStreamStatistics {
StoredStatisticsStream(final InputStream in) {
super(in);
}
@Override
public long getCompressedCount() {
return super.getBytesRead();
}
@Override
public long getUncompressedCount() {
return getCompressedCount();
}
}
private static final int HASH_SIZE = 509;
static final int NIBLET_MASK = 0x0f;
static final int BYTE_SHIFT = 8;
private static final int POS_0 = 0;
private static final int POS_1 = 1;
private static final int POS_2 = 2;
private static final int POS_3 = 3;
private static final byte[] ONE_ZERO_BYTE = new byte[1];
/**
* Length of a "central directory" entry structure without file
* name, extra fields or comment.
*/
private static final int CFH_LEN =
/* version made by */ ZipConstants.SHORT
/* version needed to extract */ + ZipConstants.SHORT
/* general purpose bit flag */ + ZipConstants.SHORT
/* compression method */ + ZipConstants.SHORT
/* last mod file time */ + ZipConstants.SHORT
/* last mod file date */ + ZipConstants.SHORT
/* crc-32 */ + ZipConstants.WORD
/* compressed size */ + ZipConstants.WORD
/* uncompressed size */ + ZipConstants.WORD
/* file name length */ + ZipConstants. SHORT
/* extra field length */ + ZipConstants.SHORT
/* file comment length */ + ZipConstants.SHORT
/* disk number start */ + ZipConstants.SHORT
/* internal file attributes */ + ZipConstants.SHORT
/* external file attributes */ + ZipConstants.WORD
/* relative offset of local header */ + ZipConstants.WORD;
private static final long CFH_SIG =
ZipLong.getValue(ZipArchiveOutputStream.CFH_SIG);
/**
* Length of the "End of central directory record" - which is
* supposed to be the last structure of the archive - without file
* comment.
*/
static final int MIN_EOCD_SIZE =
/* end of central dir signature */ ZipConstants.WORD
/* number of this disk */ + ZipConstants.SHORT
/* number of the disk with the */
/* start of the central directory */ + ZipConstants.SHORT
/* total number of entries in */
/* the central dir on this disk */ + ZipConstants.SHORT
/* total number of entries in */
/* the central dir */ + ZipConstants.SHORT
/* size of the central directory */ + ZipConstants.WORD
/* offset of start of central */
/* directory with respect to */
/* the starting disk number */ + ZipConstants.WORD
/* ZIP file comment length */ + ZipConstants.SHORT;
/**
* Maximum length of the "End of central directory record" with a
* file comment.
*/
private static final int MAX_EOCD_SIZE = MIN_EOCD_SIZE
/* maximum length of ZIP file comment */ + ZipConstants.ZIP64_MAGIC_SHORT;
/**
* Offset of the field that holds the location of the length of
* the central directory inside the "End of central directory
* record" relative to the start of the "End of central directory
* record".
*/
private static final int CFD_LENGTH_OFFSET =
/* end of central dir signature */ ZipConstants.WORD
/* number of this disk */ + ZipConstants.SHORT
/* number of the disk with the */
/* start of the central directory */ + ZipConstants.SHORT
/* total number of entries in */
/* the central dir on this disk */ + ZipConstants.SHORT
/* total number of entries in */
/* the central dir */ + ZipConstants.SHORT;
/**
* Offset of the field that holds the disk number of the first
* central directory entry inside the "End of central directory
* record" relative to the start of the "End of central directory
* record".
*/
private static final int CFD_DISK_OFFSET =
/* end of central dir signature */ ZipConstants.WORD
/* number of this disk */ + ZipConstants.SHORT;
/**
* Offset of the field that holds the location of the first
* central directory entry inside the "End of central directory
* record" relative to the "number of the disk with the start
* of the central directory".
*/
private static final int CFD_LOCATOR_RELATIVE_OFFSET =
/* total number of entries in */
/* the central dir on this disk */ + ZipConstants.SHORT
/* total number of entries in */
/* the central dir */ + ZipConstants.SHORT
/* size of the central directory */ + ZipConstants.WORD;
/**
* Length of the "Zip64 end of central directory locator" - which
* should be right in front of the "end of central directory
* record" if one is present at all.
*/
private static final int ZIP64_EOCDL_LENGTH =
/* zip64 end of central dir locator sig */ ZipConstants.WORD
/* number of the disk with the start */
/* start of the zip64 end of */
/* central directory */ + ZipConstants.WORD
/* relative offset of the zip64 */
/* end of central directory record */ + ZipConstants.DWORD
/* total number of disks */ + ZipConstants.WORD;
/**
* Offset of the field that holds the location of the "Zip64 end
* of central directory record" inside the "Zip64 end of central
* directory locator" relative to the start of the "Zip64 end of
* central directory locator".
*/
private static final int ZIP64_EOCDL_LOCATOR_OFFSET =
/* zip64 end of central dir locator sig */ ZipConstants.WORD
/* number of the disk with the start */
/* start of the zip64 end of */
/* central directory */ + ZipConstants.WORD;
/**
* Offset of the field that holds the location of the first
* central directory entry inside the "Zip64 end of central
* directory record" relative to the start of the "Zip64 end of
* central directory record".
*/
private static final int ZIP64_EOCD_CFD_LOCATOR_OFFSET =
/* zip64 end of central dir */
/* signature */ ZipConstants.WORD
/* size of zip64 end of central */
/* directory record */ + ZipConstants.DWORD
/* version made by */ + ZipConstants.SHORT
/* version needed to extract */ + ZipConstants.SHORT
/* number of this disk */ + ZipConstants.WORD
/* number of the disk with the */
/* start of the central directory */ + ZipConstants.WORD
/* total number of entries in the */
/* central directory on this disk */ + ZipConstants.DWORD
/* total number of entries in the */
/* central directory */ + ZipConstants.DWORD
/* size of the central directory */ + ZipConstants.DWORD;
/**
* Offset of the field that holds the disk number of the first
* central directory entry inside the "Zip64 end of central
* directory record" relative to the start of the "Zip64 end of
* central directory record".
*/
private static final int ZIP64_EOCD_CFD_DISK_OFFSET =
/* zip64 end of central dir */
/* signature */ ZipConstants.WORD
/* size of zip64 end of central */
/* directory record */ + ZipConstants.DWORD
/* version made by */ + ZipConstants.SHORT
/* version needed to extract */ + ZipConstants.SHORT
/* number of this disk */ + ZipConstants.WORD;
/**
* Offset of the field that holds the location of the first
* central directory entry inside the "Zip64 end of central
* directory record" relative to the "number of the disk
* with the start of the central directory".
*/
private static final int ZIP64_EOCD_CFD_LOCATOR_RELATIVE_OFFSET =
/* total number of entries in the */
/* central directory on this disk */ ZipConstants.DWORD
/* total number of entries in the */
/* central directory */ + ZipConstants.DWORD
/* size of the central directory */ + ZipConstants.DWORD;
/**
* Number of bytes in local file header up to the "length of
* file name" entry.
*/
private static final long LFH_OFFSET_FOR_FILENAME_LENGTH =
/* local file header signature */ ZipConstants.WORD
/* version needed to extract */ + ZipConstants.SHORT
/* general purpose bit flag */ + ZipConstants.SHORT
/* compression method */ + ZipConstants.SHORT
/* last mod file time */ + ZipConstants.SHORT
/* last mod file date */ + ZipConstants.SHORT
/* crc-32 */ + ZipConstants.WORD
/* compressed size */ + ZipConstants.WORD
/* uncompressed size */ + (long) ZipConstants.WORD;
/**
* Compares two ZipArchiveEntries based on their offset within the archive.
*
* Won't return any meaningful results if one of the entries
* isn't part of the archive at all.
*
* @since 1.1
*/
private static final Comparator offsetComparator =
Comparator.comparingLong(ZipArchiveEntry::getDiskNumberStart)
.thenComparingLong(ZipArchiveEntry::getLocalHeaderOffset);
/**
* Closes a ZIP file quietly; throwing no IOException, does nothing
* on null input.
* @param zipFile file to close, can be null
*/
public static void closeQuietly(final ZipFile zipFile) {
IOUtils.closeQuietly(zipFile);
}
/**
* List of entries in the order they appear inside the central
* directory.
*/
private final List entries = new LinkedList<>();
/**
* Maps String to list of ZipArchiveEntrys, name -> actual entries.
*/
private final Map> nameMap = new HashMap<>(HASH_SIZE);
/**
* The encoding to use for file names and the file comment.
*
* For a list of possible values see http://java.sun.com/j2se/1.5.0/docs/guide/intl/encoding.doc.html.
* Defaults to UTF-8.
*/
private final String encoding;
/**
* The ZIP encoding to use for file names and the file comment.
*/
private final ZipEncoding zipEncoding;
/**
* File name of actual source.
*/
private final String archiveName;
/**
* The actual data source.
*/
private final SeekableByteChannel archive;
/**
* Whether to look for and use Unicode extra fields.
*/
private final boolean useUnicodeExtraFields;
/**
* Whether the file is closed.
*/
private volatile boolean closed = true;
/**
* Whether the ZIP archive is a split ZIP archive
*/
private final boolean isSplitZipArchive;
// cached buffers - must only be used locally in the class (COMPRESS-172 - reduce garbage collection)
private final byte[] dwordBuf = new byte[ZipConstants.DWORD];
private final byte[] wordBuf = new byte[ZipConstants.WORD];
private final byte[] cfhBuf = new byte[CFH_LEN];
private final byte[] shortBuf = new byte[ZipConstants.SHORT];
private final ByteBuffer dwordBbuf = ByteBuffer.wrap(dwordBuf);
private final ByteBuffer wordBbuf = ByteBuffer.wrap(wordBuf);
private final ByteBuffer cfhBbuf = ByteBuffer.wrap(cfhBuf);
private final ByteBuffer shortBbuf = ByteBuffer.wrap(shortBuf);
private long centralDirectoryStartDiskNumber, centralDirectoryStartRelativeOffset;
private long centralDirectoryStartOffset;
private long firstLocalFileHeaderOffset;
/**
* Opens the given file for reading, assuming "UTF8" for file names.
*
* @param f the archive.
*
* @throws IOException if an error occurs while reading the file.
*/
public ZipFile(final File f) throws IOException {
this(f, ZipEncodingHelper.UTF8);
}
/**
* Opens the given file for reading, assuming the specified
* encoding for file names and scanning for Unicode extra fields.
*
* @param f the archive.
* @param encoding the encoding to use for file names, use null
* for the platform's default encoding
*
* @throws IOException if an error occurs while reading the file.
*/
public ZipFile(final File f, final String encoding) throws IOException {
this(f.toPath(), encoding, true);
}
/**
* Opens the given file for reading, assuming the specified
* encoding for file names.
*
* @param f the archive.
* @param encoding the encoding to use for file names, use null
* for the platform's default encoding
* @param useUnicodeExtraFields whether to use InfoZIP Unicode
* Extra Fields (if present) to set the file names.
*
* @throws IOException if an error occurs while reading the file.
*/
public ZipFile(final File f, final String encoding, final boolean useUnicodeExtraFields)
throws IOException {
this(f.toPath(), encoding, useUnicodeExtraFields, false);
}
/**
* Opens the given file for reading, assuming the specified
* encoding for file names.
*
* By default the central directory record and all local file headers of the archive will be read immediately
* which may take a considerable amount of time when the archive is big. The {@code ignoreLocalFileHeader} parameter
* can be set to {@code true} which restricts parsing to the central directory. Unfortunately the local file header
* may contain information not present inside of the central directory which will not be available when the argument
* is set to {@code true}. This includes the content of the Unicode extra field, so setting {@code
* ignoreLocalFileHeader} to {@code true} means {@code useUnicodeExtraFields} will be ignored effectively.
*
* @param f the archive.
* @param encoding the encoding to use for file names, use null
* for the platform's default encoding
* @param useUnicodeExtraFields whether to use InfoZIP Unicode
* Extra Fields (if present) to set the file names.
* @param ignoreLocalFileHeader whether to ignore information
* stored inside the local file header (see the notes in this method's javadoc)
*
* @throws IOException if an error occurs while reading the file.
* @since 1.19
*/
public ZipFile(final File f, final String encoding, final boolean useUnicodeExtraFields,
final boolean ignoreLocalFileHeader)
throws IOException {
this(Files.newByteChannel(f.toPath(), EnumSet.of(StandardOpenOption.READ)),
f.getAbsolutePath(), encoding, useUnicodeExtraFields, true, ignoreLocalFileHeader);
}
/**
* Opens the given path for reading, assuming "UTF8" for file names.
*
* @param path path to the archive.
* @throws IOException if an error occurs while reading the file.
* @since 1.22
*/
public ZipFile(final Path path) throws IOException {
this(path, ZipEncodingHelper.UTF8);
}
/**
* Opens the given path for reading, assuming the specified
* encoding for file names and scanning for Unicode extra fields.
*
* @param path path to the archive.
* @param encoding the encoding to use for file names, use null
* for the platform's default encoding
* @throws IOException if an error occurs while reading the file.
* @since 1.22
*/
public ZipFile(final Path path, final String encoding) throws IOException {
this(path, encoding, true);
}
/**
* Opens the given path for reading, assuming the specified
* encoding for file names.
*
* @param path path to the archive.
* @param encoding the encoding to use for file names, use null
* for the platform's default encoding
* @param useUnicodeExtraFields whether to use InfoZIP Unicode
* Extra Fields (if present) to set the file names.
* @throws IOException if an error occurs while reading the file.
* @since 1.22
*/
public ZipFile(final Path path, final String encoding, final boolean useUnicodeExtraFields)
throws IOException {
this(path, encoding, useUnicodeExtraFields, false);
}
/**
* Opens the given path for reading, assuming the specified
* encoding for file names.
* By default the central directory record and all local file headers of the archive will be read immediately
* which may take a considerable amount of time when the archive is big. The {@code ignoreLocalFileHeader} parameter
* can be set to {@code true} which restricts parsing to the central directory. Unfortunately the local file header
* may contain information not present inside of the central directory which will not be available when the argument
* is set to {@code true}. This includes the content of the Unicode extra field, so setting {@code
* ignoreLocalFileHeader} to {@code true} means {@code useUnicodeExtraFields} will be ignored effectively.
*
* @param path path to the archive.
* @param encoding the encoding to use for file names, use null
* for the platform's default encoding
* @param useUnicodeExtraFields whether to use InfoZIP Unicode
* Extra Fields (if present) to set the file names.
* @param ignoreLocalFileHeader whether to ignore information
* stored inside the local file header (see the notes in this method's javadoc)
* @throws IOException if an error occurs while reading the file.
* @since 1.22
*/
public ZipFile(final Path path, final String encoding, final boolean useUnicodeExtraFields,
final boolean ignoreLocalFileHeader)
throws IOException {
this(Files.newByteChannel(path, EnumSet.of(StandardOpenOption.READ)),
path.toAbsolutePath().toString(), encoding, useUnicodeExtraFields,
true, ignoreLocalFileHeader);
}
/**
* Opens the given channel for reading, assuming "UTF8" for file names.
*
* {@link
* org.apache.commons.compress.utils.SeekableInMemoryByteChannel}
* allows you to read from an in-memory archive.
*
* @param channel the archive.
*
* @throws IOException if an error occurs while reading the file.
* @since 1.13
*/
public ZipFile(final SeekableByteChannel channel)
throws IOException {
this(channel, "unknown archive", ZipEncodingHelper.UTF8, true);
}
/**
* Opens the given channel for reading, assuming the specified
* encoding for file names.
*
* {@link
* org.apache.commons.compress.utils.SeekableInMemoryByteChannel}
* allows you to read from an in-memory archive.
*
* @param channel the archive.
* @param encoding the encoding to use for file names, use null
* for the platform's default encoding
*
* @throws IOException if an error occurs while reading the file.
* @since 1.13
*/
public ZipFile(final SeekableByteChannel channel, final String encoding)
throws IOException {
this(channel, "unknown archive", encoding, true);
}
/**
* Opens the given channel for reading, assuming the specified
* encoding for file names.
*
* {@link
* org.apache.commons.compress.utils.SeekableInMemoryByteChannel}
* allows you to read from an in-memory archive.
*
* @param channel the archive.
* @param archiveName name of the archive, used for error messages only.
* @param encoding the encoding to use for file names, use null
* for the platform's default encoding
* @param useUnicodeExtraFields whether to use InfoZIP Unicode
* Extra Fields (if present) to set the file names.
*
* @throws IOException if an error occurs while reading the file.
* @since 1.13
*/
public ZipFile(final SeekableByteChannel channel, final String archiveName,
final String encoding, final boolean useUnicodeExtraFields)
throws IOException {
this(channel, archiveName, encoding, useUnicodeExtraFields, false, false);
}
/**
* Opens the given channel for reading, assuming the specified
* encoding for file names.
*
* {@link
* org.apache.commons.compress.utils.SeekableInMemoryByteChannel}
* allows you to read from an in-memory archive.
*
* By default the central directory record and all local file headers of the archive will be read immediately
* which may take a considerable amount of time when the archive is big. The {@code ignoreLocalFileHeader} parameter
* can be set to {@code true} which restricts parsing to the central directory. Unfortunately the local file header
* may contain information not present inside of the central directory which will not be available when the argument
* is set to {@code true}. This includes the content of the Unicode extra field, so setting {@code
* ignoreLocalFileHeader} to {@code true} means {@code useUnicodeExtraFields} will be ignored effectively.
*
* @param channel the archive.
* @param archiveName name of the archive, used for error messages only.
* @param encoding the encoding to use for file names, use null
* for the platform's default encoding
* @param useUnicodeExtraFields whether to use InfoZIP Unicode
* Extra Fields (if present) to set the file names.
* @param ignoreLocalFileHeader whether to ignore information
* stored inside the local file header (see the notes in this method's javadoc)
*
* @throws IOException if an error occurs while reading the file.
* @since 1.19
*/
public ZipFile(final SeekableByteChannel channel, final String archiveName,
final String encoding, final boolean useUnicodeExtraFields,
final boolean ignoreLocalFileHeader)
throws IOException {
this(channel, archiveName, encoding, useUnicodeExtraFields, false, ignoreLocalFileHeader);
}
private ZipFile(final SeekableByteChannel channel, final String archiveName,
final String encoding, final boolean useUnicodeExtraFields,
final boolean closeOnError, final boolean ignoreLocalFileHeader)
throws IOException {
isSplitZipArchive = (channel instanceof ZipSplitReadOnlySeekableByteChannel);
this.archiveName = archiveName;
this.encoding = encoding;
this.zipEncoding = ZipEncodingHelper.getZipEncoding(encoding);
this.useUnicodeExtraFields = useUnicodeExtraFields;
archive = channel;
boolean success = false;
try {
final Map entriesWithoutUTF8Flag =
populateFromCentralDirectory();
if (!ignoreLocalFileHeader) {
resolveLocalFileHeaderData(entriesWithoutUTF8Flag);
}
fillNameMap();
success = true;
} catch (final IOException e) {
throw new IOException("Error on ZipFile " + archiveName, e);
} finally {
closed = !success;
if (!success && closeOnError) {
IOUtils.closeQuietly(archive);
}
}
}
/**
* Opens the given file for reading, assuming "UTF8".
*
* @param name name of the archive.
*
* @throws IOException if an error occurs while reading the file.
*/
public ZipFile(final String name) throws IOException {
this(new File(name).toPath(), ZipEncodingHelper.UTF8);
}
/**
* Opens the given file for reading, assuming the specified
* encoding for file names, scanning unicode extra fields.
*
* @param name name of the archive.
* @param encoding the encoding to use for file names, use null
* for the platform's default encoding
*
* @throws IOException if an error occurs while reading the file.
*/
public ZipFile(final String name, final String encoding) throws IOException {
this(new File(name).toPath(), encoding, true);
}
/**
* Whether this class is able to read the given entry.
*
* May return false if it is set up to use encryption or a
* compression method that hasn't been implemented yet.
* @since 1.1
* @param ze the entry
* @return whether this class is able to read the given entry.
*/
public boolean canReadEntryData(final ZipArchiveEntry ze) {
return ZipUtil.canHandleEntryData(ze);
}
/**
* Closes the archive.
* @throws IOException if an error occurs closing the archive.
*/
@Override
public void close() throws IOException {
// this flag is only written here and read in finalize() which
// can never be run in parallel.
// no synchronization needed.
closed = true;
archive.close();
}
/**
* Transfer selected entries from this ZIP file to a given #ZipArchiveOutputStream.
* Compression and all other attributes will be as in this file.
* This method transfers entries based on the central directory of the ZIP file.
*
* @param target The zipArchiveOutputStream to write the entries to
* @param predicate A predicate that selects which entries to write
* @throws IOException on error
*/
public void copyRawEntries(final ZipArchiveOutputStream target, final ZipArchiveEntryPredicate predicate)
throws IOException {
final Enumeration src = getEntriesInPhysicalOrder();
while (src.hasMoreElements()) {
final ZipArchiveEntry entry = src.nextElement();
if (predicate.test( entry)) {
target.addRawArchiveEntry(entry, getRawInputStream(entry));
}
}
}
/**
* Creates new BoundedInputStream, according to implementation of
* underlying archive channel.
*/
private BoundedArchiveInputStream createBoundedInputStream(final long start, final long remaining) {
if (start < 0 || remaining < 0 || start + remaining < start) {
throw new IllegalArgumentException("Corrupted archive, stream boundaries"
+ " are out of range");
}
return archive instanceof FileChannel ?
new BoundedFileChannelInputStream(start, remaining) :
new BoundedSeekableByteChannelInputStream(start, remaining, archive);
}
private void fillNameMap() {
entries.forEach(ze -> {
// entries are filled in populateFromCentralDirectory and
// never modified
final String name = ze.getName();
final LinkedList entriesOfThatName = nameMap.computeIfAbsent(name, k -> new LinkedList<>());
entriesOfThatName.addLast(ze);
});
}
/**
* Ensures that the close method of this ZIP file is called when
* there are no more references to it.
* @see #close()
*/
@Override
protected void finalize() throws Throwable {
try {
if (!closed) {
close();
}
} finally {
super.finalize();
}
}
/**
* Gets an InputStream for reading the content before the first local file header.
*
* @return null if there is no content before the first local file header.
* Otherwise, returns a stream to read the content before the first local file header.
* @since 1.23
*/
public InputStream getContentBeforeFirstLocalFileHeader() {
return firstLocalFileHeaderOffset == 0
? null : createBoundedInputStream(0, firstLocalFileHeaderOffset);
}
private long getDataOffset(final ZipArchiveEntry ze) throws IOException {
final long s = ze.getDataOffset();
if (s == EntryStreamOffsets.OFFSET_UNKNOWN) {
setDataOffset(ze);
return ze.getDataOffset();
}
return s;
}
/**
* Gets the encoding to use for file names and the file comment.
*
* @return null if using the platform's default character encoding.
*/
public String getEncoding() {
return encoding;
}
/**
* Gets all entries.
*
* Entries will be returned in the same order they appear
* within the archive's central directory.
*
* @return all entries as {@link ZipArchiveEntry} instances
*/
public Enumeration getEntries() {
return Collections.enumeration(entries);
}
/**
* Gets all named entries in the same order they appear within
* the archive's central directory.
*
* @param name name of the entry.
* @return the Iterable<ZipArchiveEntry> corresponding to the
* given name
* @since 1.6
*/
public Iterable getEntries(final String name) {
return nameMap.getOrDefault(name, ZipArchiveEntry.EMPTY_LINKED_LIST);
}
/**
* Gets all entries in physical order.
*
* Entries will be returned in the same order their contents
* appear within the archive.
*
* @return all entries as {@link ZipArchiveEntry} instances
*
* @since 1.1
*/
public Enumeration getEntriesInPhysicalOrder() {
final ZipArchiveEntry[] allEntries = entries.toArray(ZipArchiveEntry.EMPTY_ARRAY);
Arrays.sort(allEntries, offsetComparator);
return Collections.enumeration(Arrays.asList(allEntries));
}
/**
* Gets all named entries in the same order their contents
* appear within the archive.
*
* @param name name of the entry.
* @return the Iterable<ZipArchiveEntry> corresponding to the
* given name
* @since 1.6
*/
public Iterable getEntriesInPhysicalOrder(final String name) {
ZipArchiveEntry[] entriesOfThatName = ZipArchiveEntry.EMPTY_ARRAY;
final LinkedList linkedList = nameMap.get(name);
if (linkedList != null) {
entriesOfThatName = linkedList.toArray(entriesOfThatName);
Arrays.sort(entriesOfThatName, offsetComparator);
}
return Arrays.asList(entriesOfThatName);
}
/**
* Gets a named entry or {@code null} if no entry by
* that name exists.
*
* If multiple entries with the same name exist the first entry
* in the archive's central directory by that name is
* returned.
*
* @param name name of the entry.
* @return the ZipArchiveEntry corresponding to the given name - or
* {@code null} if not present.
*/
public ZipArchiveEntry getEntry(final String name) {
final LinkedList entriesOfThatName = nameMap.get(name);
return entriesOfThatName != null ? entriesOfThatName.getFirst() : null;
}
/**
* Gets the offset of the first local file header in the file.
*
* @return the length of the content before the first local file header
* @since 1.23
*/
public long getFirstLocalFileHeaderOffset() {
return firstLocalFileHeaderOffset;
}
/**
* Gets an InputStream for reading the contents of the given entry.
*
* @param zipEntry the entry to get the stream for.
* @return a stream to read the entry from. The returned stream
* implements {@link InputStreamStatistics}.
* @throws IOException if unable to create an input stream from the zipEntry.
*/
public InputStream getInputStream(final ZipArchiveEntry zipEntry)
throws IOException {
if (!(zipEntry instanceof Entry)) {
return null;
}
// cast validity is checked just above
ZipUtil.checkRequestedFeatures(zipEntry);
// doesn't get closed if the method is not supported - which
// should never happen because of the checkRequestedFeatures
// call above
final InputStream is = new BufferedInputStream(getRawInputStream(zipEntry)); //NOSONAR
switch (ZipMethod.getMethodByCode(zipEntry.getMethod())) {
case STORED:
return new StoredStatisticsStream(is);
case UNSHRINKING:
return new UnshrinkingInputStream(is);
case IMPLODING:
try {
return new ExplodingInputStream(zipEntry.getGeneralPurposeBit().getSlidingDictionarySize(),
zipEntry.getGeneralPurposeBit().getNumberOfShannonFanoTrees(), is);
} catch (final IllegalArgumentException ex) {
throw new IOException("bad IMPLODE data", ex);
}
case DEFLATED:
final Inflater inflater = new Inflater(true);
// Inflater with nowrap=true has this odd contract for a zero padding
// byte following the data stream; this used to be zlib's requirement
// and has been fixed a long time ago, but the contract persists so
// we comply.
// https://docs.oracle.com/javase/7/docs/api/java/util/zip/Inflater.html#Inflater(boolean)
return new InflaterInputStreamWithStatistics(new SequenceInputStream(is, new ByteArrayInputStream(ONE_ZERO_BYTE)),
inflater) {
@Override
public void close() throws IOException {
try {
super.close();
} finally {
inflater.end();
}
}
};
case BZIP2:
return new BZip2CompressorInputStream(is);
case ENHANCED_DEFLATED:
return new Deflate64CompressorInputStream(is);
case AES_ENCRYPTED:
case EXPANDING_LEVEL_1:
case EXPANDING_LEVEL_2:
case EXPANDING_LEVEL_3:
case EXPANDING_LEVEL_4:
case JPEG:
case LZMA:
case PKWARE_IMPLODING:
case PPMD:
case TOKENIZATION:
case UNKNOWN:
case WAVPACK:
case XZ:
default:
throw new UnsupportedZipFeatureException(ZipMethod.getMethodByCode(zipEntry.getMethod()), zipEntry);
}
}
/**
* Gets the raw stream of the archive entry (compressed form).
*
* This method does not relate to how/if we understand the payload in the
* stream, since we really only intend to move it on to somewhere else.
*
* Since version 1.22, this method will make an attempt to read the entry's data
* stream offset, even if the {@code ignoreLocalFileHeader} parameter was {@code true}
* in the constructor. An IOException can also be thrown from the body of the method
* if this lookup fails for some reason.
*
* @param ze The entry to get the stream for
* @return The raw input stream containing (possibly) compressed data.
* @since 1.11
* @throws IOException if there is a problem reading data offset (added in version 1.22).
*/
public InputStream getRawInputStream(final ZipArchiveEntry ze) throws IOException {
if (!(ze instanceof Entry)) {
return null;
}
final long start = getDataOffset(ze);
if (start == EntryStreamOffsets.OFFSET_UNKNOWN) {
return null;
}
return createBoundedInputStream(start, ze.getCompressedSize());
}
/**
* Gets the entry's content as a String if isUnixSymlink()
* returns true for it, otherwise returns null.
* This method assumes the symbolic link's file name uses the
* same encoding that as been specified for this ZipFile.
*
* @param entry ZipArchiveEntry object that represents the symbolic link
* @return entry's content as a String
* @throws IOException problem with content's input stream
* @since 1.5
*/
public String getUnixSymlink(final ZipArchiveEntry entry) throws IOException {
if (entry != null && entry.isUnixSymlink()) {
try (InputStream in = getInputStream(entry)) {
return zipEncoding.decode(IOUtils.toByteArray(in));
}
}
return null;
}
/**
* Reads the central directory of the given archive and populates
* the internal tables with ZipArchiveEntry instances.
*
* The ZipArchiveEntrys will know all data that can be obtained from
* the central directory alone, but not the data that requires the
* local file header or additional data to be read.
*
* @return a map of zip entries that didn't have the language
* encoding flag set when read.
*/
private Map populateFromCentralDirectory()
throws IOException {
final HashMap noUTF8Flag =
new HashMap<>();
positionAtCentralDirectory();
centralDirectoryStartOffset = archive.position();
wordBbuf.rewind();
IOUtils.readFully(archive, wordBbuf);
long sig = ZipLong.getValue(wordBuf);
if (sig != CFH_SIG && startsWithLocalFileHeader()) {
throw new IOException("Central directory is empty, can't expand"
+ " corrupt archive.");
}
while (sig == CFH_SIG) {
readCentralDirectoryEntry(noUTF8Flag);
wordBbuf.rewind();
IOUtils.readFully(archive, wordBbuf);
sig = ZipLong.getValue(wordBuf);
}
return noUTF8Flag;
}
/**
* Searches for either the "Zip64 end of central directory
* locator" or the "End of central dir record", parses
* it and positions the stream at the first central directory
* record.
*/
private void positionAtCentralDirectory()
throws IOException {
positionAtEndOfCentralDirectoryRecord();
boolean found = false;
final boolean searchedForZip64EOCD =
archive.position() > ZIP64_EOCDL_LENGTH;
if (searchedForZip64EOCD) {
archive.position(archive.position() - ZIP64_EOCDL_LENGTH);
wordBbuf.rewind();
IOUtils.readFully(archive, wordBbuf);
found = Arrays.equals(ZipArchiveOutputStream.ZIP64_EOCD_LOC_SIG,
wordBuf);
}
if (!found) {
// not a ZIP64 archive
if (searchedForZip64EOCD) {
skipBytes(ZIP64_EOCDL_LENGTH - ZipConstants.WORD);
}
positionAtCentralDirectory32();
} else {
positionAtCentralDirectory64();
}
}
/**
* Parses the "End of central dir record" and positions
* the stream at the first central directory record.
*
* Expects stream to be positioned at the beginning of the
* "End of central dir record".
*/
private void positionAtCentralDirectory32()
throws IOException {
final long endOfCentralDirectoryRecordOffset = archive.position();
if (isSplitZipArchive) {
skipBytes(CFD_DISK_OFFSET);
shortBbuf.rewind();
IOUtils.readFully(archive, shortBbuf);
centralDirectoryStartDiskNumber = ZipShort.getValue(shortBuf);
skipBytes(CFD_LOCATOR_RELATIVE_OFFSET);
wordBbuf.rewind();
IOUtils.readFully(archive, wordBbuf);
centralDirectoryStartRelativeOffset = ZipLong.getValue(wordBuf);
((ZipSplitReadOnlySeekableByteChannel) archive)
.position(centralDirectoryStartDiskNumber, centralDirectoryStartRelativeOffset);
} else {
skipBytes(CFD_LENGTH_OFFSET);
wordBbuf.rewind();
IOUtils.readFully(archive, wordBbuf);
final long centralDirectoryLength = ZipLong.getValue(wordBuf);
wordBbuf.rewind();
IOUtils.readFully(archive, wordBbuf);
centralDirectoryStartDiskNumber = 0;
centralDirectoryStartRelativeOffset = ZipLong.getValue(wordBuf);
firstLocalFileHeaderOffset = Long.max(
endOfCentralDirectoryRecordOffset - centralDirectoryLength - centralDirectoryStartRelativeOffset,
0L);
archive.position(centralDirectoryStartRelativeOffset + firstLocalFileHeaderOffset);
}
}
/**
* Parses the "Zip64 end of central directory locator",
* finds the "Zip64 end of central directory record" using the
* parsed information, parses that and positions the stream at the
* first central directory record.
*
* Expects stream to be positioned right behind the "Zip64
* end of central directory locator"'s signature.
*/
private void positionAtCentralDirectory64()
throws IOException {
if (isSplitZipArchive) {
wordBbuf.rewind();
IOUtils.readFully(archive, wordBbuf);
final long diskNumberOfEOCD = ZipLong.getValue(wordBuf);
dwordBbuf.rewind();
IOUtils.readFully(archive, dwordBbuf);
final long relativeOffsetOfEOCD = ZipEightByteInteger.getLongValue(dwordBuf);
((ZipSplitReadOnlySeekableByteChannel) archive)
.position(diskNumberOfEOCD, relativeOffsetOfEOCD);
} else {
skipBytes(ZIP64_EOCDL_LOCATOR_OFFSET
- ZipConstants.WORD /* signature has already been read */);
dwordBbuf.rewind();
IOUtils.readFully(archive, dwordBbuf);
archive.position(ZipEightByteInteger.getLongValue(dwordBuf));
}
wordBbuf.rewind();
IOUtils.readFully(archive, wordBbuf);
if (!Arrays.equals(wordBuf, ZipArchiveOutputStream.ZIP64_EOCD_SIG)) {
throw new ZipException("Archive's ZIP64 end of central "
+ "directory locator is corrupt.");
}
if (isSplitZipArchive) {
skipBytes(ZIP64_EOCD_CFD_DISK_OFFSET
- ZipConstants.WORD /* signature has already been read */);
wordBbuf.rewind();
IOUtils.readFully(archive, wordBbuf);
centralDirectoryStartDiskNumber = ZipLong.getValue(wordBuf);
skipBytes(ZIP64_EOCD_CFD_LOCATOR_RELATIVE_OFFSET);
dwordBbuf.rewind();
IOUtils.readFully(archive, dwordBbuf);
centralDirectoryStartRelativeOffset = ZipEightByteInteger.getLongValue(dwordBuf);
((ZipSplitReadOnlySeekableByteChannel) archive)
.position(centralDirectoryStartDiskNumber, centralDirectoryStartRelativeOffset);
} else {
skipBytes(ZIP64_EOCD_CFD_LOCATOR_OFFSET
- ZipConstants.WORD /* signature has already been read */);
dwordBbuf.rewind();
IOUtils.readFully(archive, dwordBbuf);
centralDirectoryStartDiskNumber = 0;
centralDirectoryStartRelativeOffset = ZipEightByteInteger.getLongValue(dwordBuf);
archive.position(centralDirectoryStartRelativeOffset);
}
}
/**
* Searches for the and positions the stream at the start of the
* "End of central dir record".
*/
private void positionAtEndOfCentralDirectoryRecord()
throws IOException {
final boolean found = tryToLocateSignature(MIN_EOCD_SIZE, MAX_EOCD_SIZE,
ZipArchiveOutputStream.EOCD_SIG);
if (!found) {
throw new ZipException("Archive is not a ZIP archive");
}
}
/**
* Reads an individual entry of the central directory, creates an
* ZipArchiveEntry from it and adds it to the global maps.
*
* @param noUTF8Flag map used to collect entries that don't have
* their UTF-8 flag set and whose name will be set by data read
* from the local file header later. The current entry may be
* added to this map.
*/
private void
readCentralDirectoryEntry(final Map noUTF8Flag)
throws IOException {
cfhBbuf.rewind();
IOUtils.readFully(archive, cfhBbuf);
int off = 0;
final Entry ze = new Entry();
final int versionMadeBy = ZipShort.getValue(cfhBuf, off);
off += ZipConstants.SHORT;
ze.setVersionMadeBy(versionMadeBy);
ze.setPlatform((versionMadeBy >> BYTE_SHIFT) & NIBLET_MASK);
ze.setVersionRequired(ZipShort.getValue(cfhBuf, off));
off += ZipConstants.SHORT; // version required
final GeneralPurposeBit gpFlag = GeneralPurposeBit.parse(cfhBuf, off);
final boolean hasUTF8Flag = gpFlag.usesUTF8ForNames();
final ZipEncoding entryEncoding =
hasUTF8Flag ? ZipEncodingHelper.UTF8_ZIP_ENCODING : zipEncoding;
if (hasUTF8Flag) {
ze.setNameSource(ZipArchiveEntry.NameSource.NAME_WITH_EFS_FLAG);
}
ze.setGeneralPurposeBit(gpFlag);
ze.setRawFlag(ZipShort.getValue(cfhBuf, off));
off += ZipConstants.SHORT;
//noinspection MagicConstant
ze.setMethod(ZipShort.getValue(cfhBuf, off));
off += ZipConstants.SHORT;
final long time = ZipUtil.dosToJavaTime(ZipLong.getValue(cfhBuf, off));
ze.setTime(time);
off += ZipConstants.WORD;
ze.setCrc(ZipLong.getValue(cfhBuf, off));
off += ZipConstants.WORD;
long size = ZipLong.getValue(cfhBuf, off);
if (size < 0) {
throw new IOException("broken archive, entry with negative compressed size");
}
ze.setCompressedSize(size);
off += ZipConstants.WORD;
size = ZipLong.getValue(cfhBuf, off);
if (size < 0) {
throw new IOException("broken archive, entry with negative size");
}
ze.setSize(size);
off += ZipConstants.WORD;
final int fileNameLen = ZipShort.getValue(cfhBuf, off);
off += ZipConstants.SHORT;
if (fileNameLen < 0) {
throw new IOException("broken archive, entry with negative fileNameLen");
}
final int extraLen = ZipShort.getValue(cfhBuf, off);
off += ZipConstants.SHORT;
if (extraLen < 0) {
throw new IOException("broken archive, entry with negative extraLen");
}
final int commentLen = ZipShort.getValue(cfhBuf, off);
off += ZipConstants.SHORT;
if (commentLen < 0) {
throw new IOException("broken archive, entry with negative commentLen");
}
ze.setDiskNumberStart(ZipShort.getValue(cfhBuf, off));
off += ZipConstants.SHORT;
ze.setInternalAttributes(ZipShort.getValue(cfhBuf, off));
off += ZipConstants.SHORT;
ze.setExternalAttributes(ZipLong.getValue(cfhBuf, off));
off += ZipConstants.WORD;
final byte[] fileName = IOUtils.readRange(archive, fileNameLen);
if (fileName.length < fileNameLen) {
throw new EOFException();
}
ze.setName(entryEncoding.decode(fileName), fileName);
// LFH offset,
ze.setLocalHeaderOffset(ZipLong.getValue(cfhBuf, off) + firstLocalFileHeaderOffset);
// data offset will be filled later
entries.add(ze);
final byte[] cdExtraData = IOUtils.readRange(archive, extraLen);
if (cdExtraData.length < extraLen) {
throw new EOFException();
}
try {
ze.setCentralDirectoryExtra(cdExtraData);
} catch (final RuntimeException ex) {
final ZipException z = new ZipException("Invalid extra data in entry " + ze.getName());
z.initCause(ex);
throw z;
}
setSizesAndOffsetFromZip64Extra(ze);
sanityCheckLFHOffset(ze);
final byte[] comment = IOUtils.readRange(archive, commentLen);
if (comment.length < commentLen) {
throw new EOFException();
}
ze.setComment(entryEncoding.decode(comment));
if (!hasUTF8Flag && useUnicodeExtraFields) {
noUTF8Flag.put(ze, new NameAndComment(fileName, comment));
}
ze.setStreamContiguous(true);
}
/**
* Walks through all recorded entries and adds the data available
* from the local file header.
*
* Also records the offsets for the data to read from the
* entries.
*/
private void resolveLocalFileHeaderData(final Map
entriesWithoutUTF8Flag)
throws IOException {
for (final ZipArchiveEntry zipArchiveEntry : entries) {
// entries are filled in populateFromCentralDirectory and
// never modified
final Entry ze = (Entry) zipArchiveEntry;
final int[] lens = setDataOffset(ze);
final int fileNameLen = lens[0];
final int extraFieldLen = lens[1];
skipBytes(fileNameLen);
final byte[] localExtraData = IOUtils.readRange(archive, extraFieldLen);
if (localExtraData.length < extraFieldLen) {
throw new EOFException();
}
try {
ze.setExtra(localExtraData);
} catch (final RuntimeException ex) {
final ZipException z = new ZipException("Invalid extra data in entry " + ze.getName());
z.initCause(ex);
throw z;
}
if (entriesWithoutUTF8Flag.containsKey(ze)) {
final NameAndComment nc = entriesWithoutUTF8Flag.get(ze);
ZipUtil.setNameAndCommentFromExtraFields(ze, nc.name,
nc.comment);
}
}
}
private void sanityCheckLFHOffset(final ZipArchiveEntry ze) throws IOException {
if (ze.getDiskNumberStart() < 0) {
throw new IOException("broken archive, entry with negative disk number");
}
if (ze.getLocalHeaderOffset() < 0) {
throw new IOException("broken archive, entry with negative local file header offset");
}
if (isSplitZipArchive) {
if (ze.getDiskNumberStart() > centralDirectoryStartDiskNumber) {
throw new IOException("local file header for " + ze.getName() + " starts on a later disk than central directory");
}
if (ze.getDiskNumberStart() == centralDirectoryStartDiskNumber
&& ze.getLocalHeaderOffset() > centralDirectoryStartRelativeOffset) {
throw new IOException("local file header for " + ze.getName() + " starts after central directory");
}
} else if (ze.getLocalHeaderOffset() > centralDirectoryStartOffset) {
throw new IOException("local file header for " + ze.getName() + " starts after central directory");
}
}
private int[] setDataOffset(final ZipArchiveEntry ze) throws IOException {
long offset = ze.getLocalHeaderOffset();
if (isSplitZipArchive) {
((ZipSplitReadOnlySeekableByteChannel) archive)
.position(ze.getDiskNumberStart(), offset + LFH_OFFSET_FOR_FILENAME_LENGTH);
// the offset should be updated to the global offset
offset = archive.position() - LFH_OFFSET_FOR_FILENAME_LENGTH;
} else {
archive.position(offset + LFH_OFFSET_FOR_FILENAME_LENGTH);
}
wordBbuf.rewind();
IOUtils.readFully(archive, wordBbuf);
wordBbuf.flip();
wordBbuf.get(shortBuf);
final int fileNameLen = ZipShort.getValue(shortBuf);
wordBbuf.get(shortBuf);
final int extraFieldLen = ZipShort.getValue(shortBuf);
ze.setDataOffset(offset + LFH_OFFSET_FOR_FILENAME_LENGTH
+ ZipConstants.SHORT + ZipConstants.SHORT + fileNameLen + extraFieldLen);
if (ze.getDataOffset() + ze.getCompressedSize() > centralDirectoryStartOffset) {
throw new IOException("data for " + ze.getName() + " overlaps with central directory.");
}
return new int[] { fileNameLen, extraFieldLen };
}
/**
* If the entry holds a Zip64 extended information extra field,
* read sizes from there if the entry's sizes are set to
* 0xFFFFFFFFF, do the same for the offset of the local file
* header.
*
* Ensures the Zip64 extra either knows both compressed and
* uncompressed size or neither of both as the internal logic in
* ExtraFieldUtils forces the field to create local header data
* even if they are never used - and here a field with only one
* size would be invalid.
*/
private void setSizesAndOffsetFromZip64Extra(final ZipArchiveEntry ze)
throws IOException {
final ZipExtraField extra =
ze.getExtraField(Zip64ExtendedInformationExtraField.HEADER_ID);
if (extra != null && !(extra instanceof Zip64ExtendedInformationExtraField)) {
throw new ZipException("archive contains unparseable zip64 extra field");
}
final Zip64ExtendedInformationExtraField z64 =
(Zip64ExtendedInformationExtraField) extra;
if (z64 != null) {
final boolean hasUncompressedSize = ze.getSize() == ZipConstants.ZIP64_MAGIC;
final boolean hasCompressedSize = ze.getCompressedSize() == ZipConstants.ZIP64_MAGIC;
final boolean hasRelativeHeaderOffset =
ze.getLocalHeaderOffset() == ZipConstants.ZIP64_MAGIC;
final boolean hasDiskStart = ze.getDiskNumberStart() == ZipConstants.ZIP64_MAGIC_SHORT;
z64.reparseCentralDirectoryData(hasUncompressedSize,
hasCompressedSize,
hasRelativeHeaderOffset,
hasDiskStart);
if (hasUncompressedSize) {
final long size = z64.getSize().getLongValue();
if (size < 0) {
throw new IOException("broken archive, entry with negative size");
}
ze.setSize(size);
} else if (hasCompressedSize) {
z64.setSize(new ZipEightByteInteger(ze.getSize()));
}
if (hasCompressedSize) {
final long size = z64.getCompressedSize().getLongValue();
if (size < 0) {
throw new IOException("broken archive, entry with negative compressed size");
}
ze.setCompressedSize(size);
} else if (hasUncompressedSize) {
z64.setCompressedSize(new ZipEightByteInteger(ze.getCompressedSize()));
}
if (hasRelativeHeaderOffset) {
ze.setLocalHeaderOffset(z64.getRelativeHeaderOffset().getLongValue());
}
if (hasDiskStart) {
ze.setDiskNumberStart(z64.getDiskStartNumber().getValue());
}
}
}
/**
* Skips the given number of bytes or throws an EOFException if
* skipping failed.
*/
private void skipBytes(final int count) throws IOException {
final long currentPosition = archive.position();
final long newPosition = currentPosition + count;
if (newPosition > archive.size()) {
throw new EOFException();
}
archive.position(newPosition);
}
/**
* Checks whether the archive starts with an LFH. If it doesn't,
* it may be an empty archive.
*/
private boolean startsWithLocalFileHeader() throws IOException {
archive.position(firstLocalFileHeaderOffset);
wordBbuf.rewind();
IOUtils.readFully(archive, wordBbuf);
return Arrays.equals(wordBuf, ZipArchiveOutputStream.LFH_SIG);
}
/**
* Searches the archive backwards from minDistance to maxDistance
* for the given signature, positions the RandomaccessFile right
* at the signature if it has been found.
*/
private boolean tryToLocateSignature(final long minDistanceFromEnd,
final long maxDistanceFromEnd,
final byte[] sig) throws IOException {
boolean found = false;
long off = archive.size() - minDistanceFromEnd;
final long stopSearching =
Math.max(0L, archive.size() - maxDistanceFromEnd);
if (off >= 0) {
for (; off >= stopSearching; off--) {
archive.position(off);
try {
wordBbuf.rewind();
IOUtils.readFully(archive, wordBbuf);
wordBbuf.flip();
} catch (final EOFException ex) { // NOSONAR
break;
}
int curr = wordBbuf.get();
if (curr == sig[POS_0]) {
curr = wordBbuf.get();
if (curr == sig[POS_1]) {
curr = wordBbuf.get();
if (curr == sig[POS_2]) {
curr = wordBbuf.get();
if (curr == sig[POS_3]) {
found = true;
break;
}
}
}
}
}
}
if (found) {
archive.position(off);
}
return found;
}
}
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