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Apache Commons Compress software 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.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.SeekableByteChannel;
import java.nio.file.Files;
import java.nio.file.StandardOpenOption;
import java.util.Calendar;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.zip.Deflater;
import java.util.zip.ZipException;
import org.apache.commons.compress.archivers.ArchiveEntry;
import org.apache.commons.compress.archivers.ArchiveOutputStream;
import org.apache.commons.compress.utils.IOUtils;
import static org.apache.commons.compress.archivers.zip.ZipConstants.DATA_DESCRIPTOR_MIN_VERSION;
import static org.apache.commons.compress.archivers.zip.ZipConstants.DWORD;
import static org.apache.commons.compress.archivers.zip.ZipConstants.INITIAL_VERSION;
import static org.apache.commons.compress.archivers.zip.ZipConstants.SHORT;
import static org.apache.commons.compress.archivers.zip.ZipConstants.WORD;
import static org.apache.commons.compress.archivers.zip.ZipConstants.ZIP64_MAGIC;
import static org.apache.commons.compress.archivers.zip.ZipConstants.ZIP64_MAGIC_SHORT;
import static org.apache.commons.compress.archivers.zip.ZipConstants.ZIP64_MIN_VERSION;
import static org.apache.commons.compress.archivers.zip.ZipLong.putLong;
import static org.apache.commons.compress.archivers.zip.ZipShort.putShort;
/**
* Reimplementation of {@link java.util.zip.ZipOutputStream
* java.util.zip.ZipOutputStream} that does handle the extended
* functionality of this package, especially internal/external file
* attributes and extra fields with different layouts for local file
* data and central directory entries.
*
* This class will try to use {@link
* java.nio.channels.SeekableByteChannel} when it knows that the
* output is going to go to a file.
*
* If SeekableByteChannel cannot be used, this implementation will use
* a Data Descriptor to store size and CRC information for {@link
* #DEFLATED DEFLATED} entries, this means, you don't need to
* calculate them yourself. Unfortunately this is not possible for
* the {@link #STORED STORED} method, here setting the CRC and
* uncompressed size information is required before {@link
* #putArchiveEntry(ArchiveEntry)} can be called.
*
* As of Apache Commons Compress 1.3 it transparently supports Zip64
* extensions and thus individual entries and archives larger than 4
* GB or with more than 65536 entries in most cases but explicit
* control is provided via {@link #setUseZip64}. If the stream can not
* use SeekableByteChannel and you try to write a ZipArchiveEntry of
* unknown size then Zip64 extensions will be disabled by default.
*
* @NotThreadSafe
*/
public class ZipArchiveOutputStream extends ArchiveOutputStream {
static final int BUFFER_SIZE = 512;
private static final int LFH_SIG_OFFSET = 0;
private static final int LFH_VERSION_NEEDED_OFFSET = 4;
private static final int LFH_GPB_OFFSET = 6;
private static final int LFH_METHOD_OFFSET = 8;
private static final int LFH_TIME_OFFSET = 10;
private static final int LFH_CRC_OFFSET = 14;
private static final int LFH_COMPRESSED_SIZE_OFFSET = 18;
private static final int LFH_ORIGINAL_SIZE_OFFSET = 22;
private static final int LFH_FILENAME_LENGTH_OFFSET = 26;
private static final int LFH_EXTRA_LENGTH_OFFSET = 28;
private static final int LFH_FILENAME_OFFSET = 30;
private static final int CFH_SIG_OFFSET = 0;
private static final int CFH_VERSION_MADE_BY_OFFSET = 4;
private static final int CFH_VERSION_NEEDED_OFFSET = 6;
private static final int CFH_GPB_OFFSET = 8;
private static final int CFH_METHOD_OFFSET = 10;
private static final int CFH_TIME_OFFSET = 12;
private static final int CFH_CRC_OFFSET = 16;
private static final int CFH_COMPRESSED_SIZE_OFFSET = 20;
private static final int CFH_ORIGINAL_SIZE_OFFSET = 24;
private static final int CFH_FILENAME_LENGTH_OFFSET = 28;
private static final int CFH_EXTRA_LENGTH_OFFSET = 30;
private static final int CFH_COMMENT_LENGTH_OFFSET = 32;
private static final int CFH_DISK_NUMBER_OFFSET = 34;
private static final int CFH_INTERNAL_ATTRIBUTES_OFFSET = 36;
private static final int CFH_EXTERNAL_ATTRIBUTES_OFFSET = 38;
private static final int CFH_LFH_OFFSET = 42;
private static final int CFH_FILENAME_OFFSET = 46;
/** indicates if this archive is finished. protected for use in Jar implementation */
protected boolean finished = false;
/**
* Compression method for deflated entries.
*/
public static final int DEFLATED = java.util.zip.ZipEntry.DEFLATED;
/**
* Default compression level for deflated entries.
*/
public static final int DEFAULT_COMPRESSION = Deflater.DEFAULT_COMPRESSION;
/**
* Compression method for stored entries.
*/
public static final int STORED = java.util.zip.ZipEntry.STORED;
/**
* default encoding for file names and comment.
*/
static final String DEFAULT_ENCODING = ZipEncodingHelper.UTF8;
/**
* General purpose flag, which indicates that filenames are
* written in UTF-8.
* @deprecated use {@link GeneralPurposeBit#UFT8_NAMES_FLAG} instead
*/
@Deprecated
public static final int EFS_FLAG = GeneralPurposeBit.UFT8_NAMES_FLAG;
private static final byte[] EMPTY = new byte[0];
/**
* Current entry.
*/
private CurrentEntry entry;
/**
* The file comment.
*/
private String comment = "";
/**
* Compression level for next entry.
*/
private int level = DEFAULT_COMPRESSION;
/**
* Has the compression level changed when compared to the last
* entry?
*/
private boolean hasCompressionLevelChanged = false;
/**
* Default compression method for next entry.
*/
private int method = java.util.zip.ZipEntry.DEFLATED;
/**
* List of ZipArchiveEntries written so far.
*/
private final List entries =
new LinkedList<>();
private final StreamCompressor streamCompressor;
/**
* Start of central directory.
*/
private long cdOffset = 0;
/**
* Length of central directory.
*/
private long cdLength = 0;
/**
* Helper, a 0 as ZipShort.
*/
private static final byte[] ZERO = {0, 0};
/**
* Helper, a 0 as ZipLong.
*/
private static final byte[] LZERO = {0, 0, 0, 0};
private static final byte[] ONE = ZipLong.getBytes(1L);
/**
* Holds the offsets of the LFH starts for each entry.
*/
private final Map offsets =
new HashMap<>();
/**
* The encoding to use for filenames 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 String encoding = DEFAULT_ENCODING;
/**
* The zip encoding to use for filenames and the file comment.
*
* This field is of internal use and will be set in {@link
* #setEncoding(String)}.
*/
private ZipEncoding zipEncoding =
ZipEncodingHelper.getZipEncoding(DEFAULT_ENCODING);
/**
* This Deflater object is used for output.
*
*/
protected final Deflater def;
/**
* Optional random access output.
*/
private final SeekableByteChannel channel;
private final OutputStream out;
/**
* whether to use the general purpose bit flag when writing UTF-8
* filenames or not.
*/
private boolean useUTF8Flag = true;
/**
* Whether to encode non-encodable file names as UTF-8.
*/
private boolean fallbackToUTF8 = false;
/**
* whether to create UnicodePathExtraField-s for each entry.
*/
private UnicodeExtraFieldPolicy createUnicodeExtraFields = UnicodeExtraFieldPolicy.NEVER;
/**
* Whether anything inside this archive has used a ZIP64 feature.
*
* @since 1.3
*/
private boolean hasUsedZip64 = false;
private Zip64Mode zip64Mode = Zip64Mode.AsNeeded;
private final byte[] copyBuffer = new byte[32768];
private final Calendar calendarInstance = Calendar.getInstance();
/**
* Creates a new ZIP OutputStream filtering the underlying stream.
* @param out the outputstream to zip
*/
public ZipArchiveOutputStream(final OutputStream out) {
this.out = out;
this.channel = null;
def = new Deflater(level, true);
streamCompressor = StreamCompressor.create(out, def);
}
/**
* Creates a new ZIP OutputStream writing to a File. Will use
* random access if possible.
* @param file the file to zip to
* @throws IOException on error
*/
public ZipArchiveOutputStream(final File file) throws IOException {
def = new Deflater(level, true);
OutputStream o = null;
SeekableByteChannel _channel = null;
StreamCompressor _streamCompressor = null;
try {
_channel = Files.newByteChannel(file.toPath(),
EnumSet.of(StandardOpenOption.CREATE, StandardOpenOption.WRITE,
StandardOpenOption.READ,
StandardOpenOption.TRUNCATE_EXISTING));
// will never get opened properly when an exception is thrown so doesn't need to get closed
_streamCompressor = StreamCompressor.create(_channel, def); //NOSONAR
} catch (final IOException e) {
IOUtils.closeQuietly(_channel);
_channel = null;
o = new FileOutputStream(file);
_streamCompressor = StreamCompressor.create(o, def);
}
out = o;
channel = _channel;
streamCompressor = _streamCompressor;
}
/**
* Creates a new ZIP OutputStream writing to a SeekableByteChannel.
*
* {@link
* org.apache.commons.compress.utils.SeekableInMemoryByteChannel}
* allows you to write to an in-memory archive using random
* access.
*
* @param channel the channel to zip to
* @throws IOException on error
* @since 1.13
*/
public ZipArchiveOutputStream(SeekableByteChannel channel) throws IOException {
this.channel = channel;
def = new Deflater(level, true);
streamCompressor = StreamCompressor.create(channel, def);
out = null;
}
/**
* This method indicates whether this archive is writing to a
* seekable stream (i.e., to a random access file).
*
* For seekable streams, you don't need to calculate the CRC or
* uncompressed size for {@link #STORED} entries before
* invoking {@link #putArchiveEntry(ArchiveEntry)}.
* @return true if seekable
*/
public boolean isSeekable() {
return channel != null;
}
/**
* The encoding to use for filenames 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.
* @param encoding the encoding to use for file names, use null
* for the platform's default encoding
*/
public void setEncoding(final String encoding) {
this.encoding = encoding;
this.zipEncoding = ZipEncodingHelper.getZipEncoding(encoding);
if (useUTF8Flag && !ZipEncodingHelper.isUTF8(encoding)) {
useUTF8Flag = false;
}
}
/**
* The encoding to use for filenames and the file comment.
*
* @return null if using the platform's default character encoding.
*/
public String getEncoding() {
return encoding;
}
/**
* Whether to set the language encoding flag if the file name
* encoding is UTF-8.
*
* Defaults to true.
*
* @param b whether to set the language encoding flag if the file
* name encoding is UTF-8
*/
public void setUseLanguageEncodingFlag(final boolean b) {
useUTF8Flag = b && ZipEncodingHelper.isUTF8(encoding);
}
/**
* Whether to create Unicode Extra Fields.
*
* Defaults to NEVER.
*
* @param b whether to create Unicode Extra Fields.
*/
public void setCreateUnicodeExtraFields(final UnicodeExtraFieldPolicy b) {
createUnicodeExtraFields = b;
}
/**
* Whether to fall back to UTF and the language encoding flag if
* the file name cannot be encoded using the specified encoding.
*
* Defaults to false.
*
* @param b whether to fall back to UTF and the language encoding
* flag if the file name cannot be encoded using the specified
* encoding.
*/
public void setFallbackToUTF8(final boolean b) {
fallbackToUTF8 = b;
}
/**
* Whether Zip64 extensions will be used.
*
* When setting the mode to {@link Zip64Mode#Never Never},
* {@link #putArchiveEntry}, {@link #closeArchiveEntry}, {@link
* #finish} or {@link #close} may throw a {@link
* Zip64RequiredException} if the entry's size or the total size
* of the archive exceeds 4GB or there are more than 65536 entries
* inside the archive. Any archive created in this mode will be
* readable by implementations that don't support Zip64.
*
* When setting the mode to {@link Zip64Mode#Always Always},
* Zip64 extensions will be used for all entries. Any archive
* created in this mode may be unreadable by implementations that
* don't support Zip64 even if all its contents would be.
*
* When setting the mode to {@link Zip64Mode#AsNeeded
* AsNeeded}, Zip64 extensions will transparently be used for
* those entries that require them. This mode can only be used if
* the uncompressed size of the {@link ZipArchiveEntry} is known
* when calling {@link #putArchiveEntry} or the archive is written
* to a seekable output (i.e. you have used the {@link
* #ZipArchiveOutputStream(java.io.File) File-arg constructor}) -
* this mode is not valid when the output stream is not seekable
* and the uncompressed size is unknown when {@link
* #putArchiveEntry} is called.
*
* If no entry inside the resulting archive requires Zip64
* extensions then {@link Zip64Mode#Never Never} will create the
* smallest archive. {@link Zip64Mode#AsNeeded AsNeeded} will
* create a slightly bigger archive if the uncompressed size of
* any entry has initially been unknown and create an archive
* identical to {@link Zip64Mode#Never Never} otherwise. {@link
* Zip64Mode#Always Always} will create an archive that is at
* least 24 bytes per entry bigger than the one {@link
* Zip64Mode#Never Never} would create.
*
* Defaults to {@link Zip64Mode#AsNeeded AsNeeded} unless
* {@link #putArchiveEntry} is called with an entry of unknown
* size and data is written to a non-seekable stream - in this
* case the default is {@link Zip64Mode#Never Never}.
*
* @since 1.3
* @param mode Whether Zip64 extensions will be used.
*/
public void setUseZip64(final Zip64Mode mode) {
zip64Mode = mode;
}
/**
* {@inheritDoc}
* @throws Zip64RequiredException if the archive's size exceeds 4
* GByte or there are more than 65535 entries inside the archive
* and {@link #setUseZip64} is {@link Zip64Mode#Never}.
*/
@Override
public void finish() throws IOException {
if (finished) {
throw new IOException("This archive has already been finished");
}
if (entry != null) {
throw new IOException("This archive contains unclosed entries.");
}
cdOffset = streamCompressor.getTotalBytesWritten();
writeCentralDirectoryInChunks();
cdLength = streamCompressor.getTotalBytesWritten() - cdOffset;
writeZip64CentralDirectory();
writeCentralDirectoryEnd();
offsets.clear();
entries.clear();
streamCompressor.close();
finished = true;
}
private void writeCentralDirectoryInChunks() throws IOException {
final int NUM_PER_WRITE = 1000;
final ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(70 * NUM_PER_WRITE);
int count = 0;
for (final ZipArchiveEntry ze : entries) {
byteArrayOutputStream.write(createCentralFileHeader(ze));
if (++count > NUM_PER_WRITE){
writeCounted(byteArrayOutputStream.toByteArray());
byteArrayOutputStream.reset();
count = 0;
}
}
writeCounted(byteArrayOutputStream.toByteArray());
}
/**
* Writes all necessary data for this entry.
* @throws IOException on error
* @throws Zip64RequiredException if the entry's uncompressed or
* compressed size exceeds 4 GByte and {@link #setUseZip64}
* is {@link Zip64Mode#Never}.
*/
@Override
public void closeArchiveEntry() throws IOException {
preClose();
flushDeflater();
final long bytesWritten = streamCompressor.getTotalBytesWritten() - entry.dataStart;
final long realCrc = streamCompressor.getCrc32();
entry.bytesRead = streamCompressor.getBytesRead();
final Zip64Mode effectiveMode = getEffectiveZip64Mode(entry.entry);
final boolean actuallyNeedsZip64 = handleSizesAndCrc(bytesWritten, realCrc, effectiveMode);
closeEntry(actuallyNeedsZip64, false);
streamCompressor.reset();
}
/**
* Writes all necessary data for this entry.
*
* @param phased This entry is second phase of a 2-phase zip creation, size, compressed size and crc
* are known in ZipArchiveEntry
* @throws IOException on error
* @throws Zip64RequiredException if the entry's uncompressed or
* compressed size exceeds 4 GByte and {@link #setUseZip64}
* is {@link Zip64Mode#Never}.
*/
private void closeCopiedEntry(final boolean phased) throws IOException {
preClose();
entry.bytesRead = entry.entry.getSize();
final Zip64Mode effectiveMode = getEffectiveZip64Mode(entry.entry);
final boolean actuallyNeedsZip64 = checkIfNeedsZip64(effectiveMode);
closeEntry(actuallyNeedsZip64, phased);
}
private void closeEntry(final boolean actuallyNeedsZip64, final boolean phased) throws IOException {
if (!phased && channel != null) {
rewriteSizesAndCrc(actuallyNeedsZip64);
}
writeDataDescriptor(entry.entry);
entry = null;
}
private void preClose() throws IOException {
if (finished) {
throw new IOException("Stream has already been finished");
}
if (entry == null) {
throw new IOException("No current entry to close");
}
if (!entry.hasWritten) {
write(EMPTY, 0, 0);
}
}
/**
* Adds an archive entry with a raw input stream.
*
* If crc, size and compressed size are supplied on the entry, these values will be used as-is.
* Zip64 status is re-established based on the settings in this stream, and the supplied value
* is ignored.
*
* The entry is put and closed immediately.
*
* @param entry The archive entry to add
* @param rawStream The raw input stream of a different entry. May be compressed/encrypted.
* @throws IOException If copying fails
*/
public void addRawArchiveEntry(final ZipArchiveEntry entry, final InputStream rawStream)
throws IOException {
final ZipArchiveEntry ae = new ZipArchiveEntry(entry);
if (hasZip64Extra(ae)) {
// Will be re-added as required. this may make the file generated with this method
// somewhat smaller than standard mode,
// since standard mode is unable to remove the zip 64 header.
ae.removeExtraField(Zip64ExtendedInformationExtraField.HEADER_ID);
}
final boolean is2PhaseSource = ae.getCrc() != ZipArchiveEntry.CRC_UNKNOWN
&& ae.getSize() != ArchiveEntry.SIZE_UNKNOWN
&& ae.getCompressedSize() != ArchiveEntry.SIZE_UNKNOWN;
putArchiveEntry(ae, is2PhaseSource);
copyFromZipInputStream(rawStream);
closeCopiedEntry(is2PhaseSource);
}
/**
* Ensures all bytes sent to the deflater are written to the stream.
*/
private void flushDeflater() throws IOException {
if (entry.entry.getMethod() == DEFLATED) {
streamCompressor.flushDeflater();
}
}
/**
* Ensures the current entry's size and CRC information is set to
* the values just written, verifies it isn't too big in the
* Zip64Mode.Never case and returns whether the entry would
* require a Zip64 extra field.
*/
private boolean handleSizesAndCrc(final long bytesWritten, final long crc,
final Zip64Mode effectiveMode)
throws ZipException {
if (entry.entry.getMethod() == DEFLATED) {
/* It turns out def.getBytesRead() returns wrong values if
* the size exceeds 4 GB on Java < Java7
entry.entry.setSize(def.getBytesRead());
*/
entry.entry.setSize(entry.bytesRead);
entry.entry.setCompressedSize(bytesWritten);
entry.entry.setCrc(crc);
} else if (channel == null) {
if (entry.entry.getCrc() != crc) {
throw new ZipException("bad CRC checksum for entry "
+ entry.entry.getName() + ": "
+ Long.toHexString(entry.entry.getCrc())
+ " instead of "
+ Long.toHexString(crc));
}
if (entry.entry.getSize() != bytesWritten) {
throw new ZipException("bad size for entry "
+ entry.entry.getName() + ": "
+ entry.entry.getSize()
+ " instead of "
+ bytesWritten);
}
} else { /* method is STORED and we used SeekableByteChannel */
entry.entry.setSize(bytesWritten);
entry.entry.setCompressedSize(bytesWritten);
entry.entry.setCrc(crc);
}
return checkIfNeedsZip64(effectiveMode);
}
/**
* Ensures the current entry's size and CRC information is set to
* the values just written, verifies it isn't too big in the
* Zip64Mode.Never case and returns whether the entry would
* require a Zip64 extra field.
*/
private boolean checkIfNeedsZip64(final Zip64Mode effectiveMode)
throws ZipException {
final boolean actuallyNeedsZip64 = isZip64Required(entry.entry, effectiveMode);
if (actuallyNeedsZip64 && effectiveMode == Zip64Mode.Never) {
throw new Zip64RequiredException(Zip64RequiredException.getEntryTooBigMessage(entry.entry));
}
return actuallyNeedsZip64;
}
private boolean isZip64Required(final ZipArchiveEntry entry1, final Zip64Mode requestedMode) {
return requestedMode == Zip64Mode.Always || isTooLageForZip32(entry1);
}
private boolean isTooLageForZip32(final ZipArchiveEntry zipArchiveEntry){
return zipArchiveEntry.getSize() >= ZIP64_MAGIC || zipArchiveEntry.getCompressedSize() >= ZIP64_MAGIC;
}
/**
* When using random access output, write the local file header
* and potentiall the ZIP64 extra containing the correct CRC and
* compressed/uncompressed sizes.
*/
private void rewriteSizesAndCrc(final boolean actuallyNeedsZip64)
throws IOException {
final long save = channel.position();
channel.position(entry.localDataStart);
writeOut(ZipLong.getBytes(entry.entry.getCrc()));
if (!hasZip64Extra(entry.entry) || !actuallyNeedsZip64) {
writeOut(ZipLong.getBytes(entry.entry.getCompressedSize()));
writeOut(ZipLong.getBytes(entry.entry.getSize()));
} else {
writeOut(ZipLong.ZIP64_MAGIC.getBytes());
writeOut(ZipLong.ZIP64_MAGIC.getBytes());
}
if (hasZip64Extra(entry.entry)) {
final ByteBuffer name = getName(entry.entry);
final int nameLen = name.limit() - name.position();
// seek to ZIP64 extra, skip header and size information
channel.position(entry.localDataStart + 3 * WORD + 2 * SHORT
+ nameLen + 2 * SHORT);
// inside the ZIP64 extra uncompressed size comes
// first, unlike the LFH, CD or data descriptor
writeOut(ZipEightByteInteger.getBytes(entry.entry.getSize()));
writeOut(ZipEightByteInteger.getBytes(entry.entry.getCompressedSize()));
if (!actuallyNeedsZip64) {
// do some cleanup:
// * rewrite version needed to extract
channel.position(entry.localDataStart - 5 * SHORT);
writeOut(ZipShort.getBytes(INITIAL_VERSION));
// * remove ZIP64 extra so it doesn't get written
// to the central directory
entry.entry.removeExtraField(Zip64ExtendedInformationExtraField
.HEADER_ID);
entry.entry.setExtra();
// * reset hasUsedZip64 if it has been set because
// of this entry
if (entry.causedUseOfZip64) {
hasUsedZip64 = false;
}
}
}
channel.position(save);
}
/**
* {@inheritDoc}
* @throws ClassCastException if entry is not an instance of ZipArchiveEntry
* @throws Zip64RequiredException if the entry's uncompressed or
* compressed size is known to exceed 4 GByte and {@link #setUseZip64}
* is {@link Zip64Mode#Never}.
*/
@Override
public void putArchiveEntry(final ArchiveEntry archiveEntry) throws IOException {
putArchiveEntry(archiveEntry, false);
}
/**
* Writes the headers for an archive entry to the output stream.
* The caller must then write the content to the stream and call
* {@link #closeArchiveEntry()} to complete the process.
* @param archiveEntry The archiveEntry
* @param phased If true size, compressedSize and crc required to be known up-front in the archiveEntry
* @throws ClassCastException if entry is not an instance of ZipArchiveEntry
* @throws Zip64RequiredException if the entry's uncompressed or
* compressed size is known to exceed 4 GByte and {@link #setUseZip64}
* is {@link Zip64Mode#Never}.
*/
private void putArchiveEntry(final ArchiveEntry archiveEntry, final boolean phased) throws IOException {
if (finished) {
throw new IOException("Stream has already been finished");
}
if (entry != null) {
closeArchiveEntry();
}
entry = new CurrentEntry((ZipArchiveEntry) archiveEntry);
entries.add(entry.entry);
setDefaults(entry.entry);
final Zip64Mode effectiveMode = getEffectiveZip64Mode(entry.entry);
validateSizeInformation(effectiveMode);
if (shouldAddZip64Extra(entry.entry, effectiveMode)) {
final Zip64ExtendedInformationExtraField z64 = getZip64Extra(entry.entry);
// just a placeholder, real data will be in data
// descriptor or inserted later via SeekableByteChannel
ZipEightByteInteger size = ZipEightByteInteger.ZERO;
ZipEightByteInteger compressedSize = ZipEightByteInteger.ZERO;
if (phased){
size = new ZipEightByteInteger(entry.entry.getSize());
compressedSize = new ZipEightByteInteger(entry.entry.getCompressedSize());
} else if (entry.entry.getMethod() == STORED
&& entry.entry.getSize() != ArchiveEntry.SIZE_UNKNOWN) {
// actually, we already know the sizes
size = new ZipEightByteInteger(entry.entry.getSize());
compressedSize = size;
}
z64.setSize(size);
z64.setCompressedSize(compressedSize);
entry.entry.setExtra();
}
if (entry.entry.getMethod() == DEFLATED && hasCompressionLevelChanged) {
def.setLevel(level);
hasCompressionLevelChanged = false;
}
writeLocalFileHeader((ZipArchiveEntry) archiveEntry, phased);
}
/**
* Provides default values for compression method and last
* modification time.
*/
private void setDefaults(final ZipArchiveEntry entry) {
if (entry.getMethod() == -1) { // not specified
entry.setMethod(method);
}
if (entry.getTime() == -1) { // not specified
entry.setTime(System.currentTimeMillis());
}
}
/**
* Throws an exception if the size is unknown for a stored entry
* that is written to a non-seekable output or the entry is too
* big to be written without Zip64 extra but the mode has been set
* to Never.
*/
private void validateSizeInformation(final Zip64Mode effectiveMode)
throws ZipException {
// Size/CRC not required if SeekableByteChannel is used
if (entry.entry.getMethod() == STORED && channel == null) {
if (entry.entry.getSize() == ArchiveEntry.SIZE_UNKNOWN) {
throw new ZipException("uncompressed size is required for"
+ " STORED method when not writing to a"
+ " file");
}
if (entry.entry.getCrc() == ZipArchiveEntry.CRC_UNKNOWN) {
throw new ZipException("crc checksum is required for STORED"
+ " method when not writing to a file");
}
entry.entry.setCompressedSize(entry.entry.getSize());
}
if ((entry.entry.getSize() >= ZIP64_MAGIC
|| entry.entry.getCompressedSize() >= ZIP64_MAGIC)
&& effectiveMode == Zip64Mode.Never) {
throw new Zip64RequiredException(Zip64RequiredException
.getEntryTooBigMessage(entry.entry));
}
}
/**
* Whether to addd a Zip64 extended information extra field to the
* local file header.
*
* Returns true if
*
*
* - mode is Always
* - or we already know it is going to be needed
* - or the size is unknown and we can ensure it won't hurt
* other implementations if we add it (i.e. we can erase its
* usage
*
*/
private boolean shouldAddZip64Extra(final ZipArchiveEntry entry, final Zip64Mode mode) {
return mode == Zip64Mode.Always
|| entry.getSize() >= ZIP64_MAGIC
|| entry.getCompressedSize() >= ZIP64_MAGIC
|| (entry.getSize() == ArchiveEntry.SIZE_UNKNOWN
&& channel != null && mode != Zip64Mode.Never);
}
/**
* Set the file comment.
* @param comment the comment
*/
public void setComment(final String comment) {
this.comment = comment;
}
/**
* Sets the compression level for subsequent entries.
*
* Default is Deflater.DEFAULT_COMPRESSION.
* @param level the compression level.
* @throws IllegalArgumentException if an invalid compression
* level is specified.
*/
public void setLevel(final int level) {
if (level < Deflater.DEFAULT_COMPRESSION
|| level > Deflater.BEST_COMPRESSION) {
throw new IllegalArgumentException("Invalid compression level: "
+ level);
}
hasCompressionLevelChanged = (this.level != level);
this.level = level;
}
/**
* Sets the default compression method for subsequent entries.
*
* Default is DEFLATED.
* @param method an int from java.util.zip.ZipEntry
*/
public void setMethod(final int method) {
this.method = method;
}
/**
* Whether this stream is able to write 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
*/
@Override
public boolean canWriteEntryData(final ArchiveEntry ae) {
if (ae instanceof ZipArchiveEntry) {
final ZipArchiveEntry zae = (ZipArchiveEntry) ae;
return zae.getMethod() != ZipMethod.IMPLODING.getCode()
&& zae.getMethod() != ZipMethod.UNSHRINKING.getCode()
&& ZipUtil.canHandleEntryData(zae);
}
return false;
}
/**
* Writes bytes to ZIP entry.
* @param b the byte array to write
* @param offset the start position to write from
* @param length the number of bytes to write
* @throws IOException on error
*/
@Override
public void write(final byte[] b, final int offset, final int length) throws IOException {
if (entry == null) {
throw new IllegalStateException("No current entry");
}
ZipUtil.checkRequestedFeatures(entry.entry);
final long writtenThisTime = streamCompressor.write(b, offset, length, entry.entry.getMethod());
count(writtenThisTime);
}
/**
* Write bytes to output or random access file.
* @param data the byte array to write
* @throws IOException on error
*/
private void writeCounted(final byte[] data) throws IOException {
streamCompressor.writeCounted(data);
}
private void copyFromZipInputStream(final InputStream src) throws IOException {
if (entry == null) {
throw new IllegalStateException("No current entry");
}
ZipUtil.checkRequestedFeatures(entry.entry);
entry.hasWritten = true;
int length;
while ((length = src.read(copyBuffer)) >= 0 )
{
streamCompressor.writeCounted(copyBuffer, 0, length);
count( length );
}
}
/**
* Closes this output stream and releases any system resources
* associated with the stream.
*
* @throws IOException if an I/O error occurs.
* @throws Zip64RequiredException if the archive's size exceeds 4
* GByte or there are more than 65535 entries inside the archive
* and {@link #setUseZip64} is {@link Zip64Mode#Never}.
*/
@Override
public void close() throws IOException {
if (!finished) {
finish();
}
destroy();
}
/**
* Flushes this output stream and forces any buffered output bytes
* to be written out to the stream.
*
* @throws IOException if an I/O error occurs.
*/
@Override
public void flush() throws IOException {
if (out != null) {
out.flush();
}
}
/*
* Various ZIP constants shared between this class, ZipArchiveInputStream and ZipFile
*/
/**
* local file header signature
*/
static final byte[] LFH_SIG = ZipLong.LFH_SIG.getBytes(); //NOSONAR
/**
* data descriptor signature
*/
static final byte[] DD_SIG = ZipLong.DD_SIG.getBytes(); //NOSONAR
/**
* central file header signature
*/
static final byte[] CFH_SIG = ZipLong.CFH_SIG.getBytes(); //NOSONAR
/**
* end of central dir signature
*/
static final byte[] EOCD_SIG = ZipLong.getBytes(0X06054B50L); //NOSONAR
/**
* ZIP64 end of central dir signature
*/
static final byte[] ZIP64_EOCD_SIG = ZipLong.getBytes(0X06064B50L); //NOSONAR
/**
* ZIP64 end of central dir locator signature
*/
static final byte[] ZIP64_EOCD_LOC_SIG = ZipLong.getBytes(0X07064B50L); //NOSONAR
/**
* Writes next block of compressed data to the output stream.
* @throws IOException on error
*/
protected final void deflate() throws IOException {
streamCompressor.deflate();
}
/**
* Writes the local file header entry
* @param ze the entry to write
* @throws IOException on error
*/
protected void writeLocalFileHeader(final ZipArchiveEntry ze) throws IOException {
writeLocalFileHeader(ze, false);
}
private void writeLocalFileHeader(final ZipArchiveEntry ze, final boolean phased) throws IOException {
final boolean encodable = zipEncoding.canEncode(ze.getName());
final ByteBuffer name = getName(ze);
if (createUnicodeExtraFields != UnicodeExtraFieldPolicy.NEVER) {
addUnicodeExtraFields(ze, encodable, name);
}
final byte[] localHeader = createLocalFileHeader(ze, name, encodable, phased);
final long localHeaderStart = streamCompressor.getTotalBytesWritten();
offsets.put(ze, localHeaderStart);
entry.localDataStart = localHeaderStart + LFH_CRC_OFFSET; // At crc offset
writeCounted(localHeader);
entry.dataStart = streamCompressor.getTotalBytesWritten();
}
private byte[] createLocalFileHeader(final ZipArchiveEntry ze, final ByteBuffer name, final boolean encodable,
final boolean phased) {
final byte[] extra = ze.getLocalFileDataExtra();
final int nameLen = name.limit() - name.position();
final int len= LFH_FILENAME_OFFSET + nameLen + extra.length;
final byte[] buf = new byte[len];
System.arraycopy(LFH_SIG, 0, buf, LFH_SIG_OFFSET, WORD);
//store method in local variable to prevent multiple method calls
final int zipMethod = ze.getMethod();
if (phased && !isZip64Required(entry.entry, zip64Mode)){
putShort(INITIAL_VERSION, buf, LFH_VERSION_NEEDED_OFFSET);
} else {
putShort(versionNeededToExtract(zipMethod, hasZip64Extra(ze)), buf, LFH_VERSION_NEEDED_OFFSET);
}
final GeneralPurposeBit generalPurposeBit = getGeneralPurposeBits(zipMethod, !encodable && fallbackToUTF8);
generalPurposeBit.encode(buf, LFH_GPB_OFFSET);
// compression method
putShort(zipMethod, buf, LFH_METHOD_OFFSET);
ZipUtil.toDosTime(calendarInstance, ze.getTime(), buf, LFH_TIME_OFFSET);
// CRC
if (phased){
putLong(ze.getCrc(), buf, LFH_CRC_OFFSET);
} else if (zipMethod == DEFLATED || channel != null) {
System.arraycopy(LZERO, 0, buf, LFH_CRC_OFFSET, WORD);
} else {
putLong(ze.getCrc(), buf, LFH_CRC_OFFSET);
}
// compressed length
// uncompressed length
if (hasZip64Extra(entry.entry)){
// point to ZIP64 extended information extra field for
// sizes, may get rewritten once sizes are known if
// stream is seekable
ZipLong.ZIP64_MAGIC.putLong(buf, LFH_COMPRESSED_SIZE_OFFSET);
ZipLong.ZIP64_MAGIC.putLong(buf, LFH_ORIGINAL_SIZE_OFFSET);
} else if (phased) {
putLong(ze.getCompressedSize(), buf, LFH_COMPRESSED_SIZE_OFFSET);
putLong(ze.getSize(), buf, LFH_ORIGINAL_SIZE_OFFSET);
} else if (zipMethod == DEFLATED || channel != null) {
System.arraycopy(LZERO, 0, buf, LFH_COMPRESSED_SIZE_OFFSET, WORD);
System.arraycopy(LZERO, 0, buf, LFH_ORIGINAL_SIZE_OFFSET, WORD);
} else { // Stored
putLong(ze.getSize(), buf, LFH_COMPRESSED_SIZE_OFFSET);
putLong(ze.getSize(), buf, LFH_ORIGINAL_SIZE_OFFSET);
}
// file name length
putShort(nameLen, buf, LFH_FILENAME_LENGTH_OFFSET);
// extra field length
putShort(extra.length, buf, LFH_EXTRA_LENGTH_OFFSET);
// file name
System.arraycopy( name.array(), name.arrayOffset(), buf, LFH_FILENAME_OFFSET, nameLen);
System.arraycopy(extra, 0, buf, LFH_FILENAME_OFFSET + nameLen, extra.length);
return buf;
}
/**
* Adds UnicodeExtra fields for name and file comment if mode is
* ALWAYS or the data cannot be encoded using the configured
* encoding.
*/
private void addUnicodeExtraFields(final ZipArchiveEntry ze, final boolean encodable,
final ByteBuffer name)
throws IOException {
if (createUnicodeExtraFields == UnicodeExtraFieldPolicy.ALWAYS
|| !encodable) {
ze.addExtraField(new UnicodePathExtraField(ze.getName(),
name.array(),
name.arrayOffset(),
name.limit()
- name.position()));
}
final String comm = ze.getComment();
if (comm != null && !"".equals(comm)) {
final boolean commentEncodable = zipEncoding.canEncode(comm);
if (createUnicodeExtraFields == UnicodeExtraFieldPolicy.ALWAYS
|| !commentEncodable) {
final ByteBuffer commentB = getEntryEncoding(ze).encode(comm);
ze.addExtraField(new UnicodeCommentExtraField(comm,
commentB.array(),
commentB.arrayOffset(),
commentB.limit()
- commentB.position())
);
}
}
}
/**
* Writes the data descriptor entry.
* @param ze the entry to write
* @throws IOException on error
*/
protected void writeDataDescriptor(final ZipArchiveEntry ze) throws IOException {
if (ze.getMethod() != DEFLATED || channel != null) {
return;
}
writeCounted(DD_SIG);
writeCounted(ZipLong.getBytes(ze.getCrc()));
if (!hasZip64Extra(ze)) {
writeCounted(ZipLong.getBytes(ze.getCompressedSize()));
writeCounted(ZipLong.getBytes(ze.getSize()));
} else {
writeCounted(ZipEightByteInteger.getBytes(ze.getCompressedSize()));
writeCounted(ZipEightByteInteger.getBytes(ze.getSize()));
}
}
/**
* Writes the central file header entry.
* @param ze the entry to write
* @throws IOException on error
* @throws Zip64RequiredException if the archive's size exceeds 4
* GByte and {@link Zip64Mode #setUseZip64} is {@link
* Zip64Mode#Never}.
*/
protected void writeCentralFileHeader(final ZipArchiveEntry ze) throws IOException {
final byte[] centralFileHeader = createCentralFileHeader(ze);
writeCounted(centralFileHeader);
}
private byte[] createCentralFileHeader(final ZipArchiveEntry ze) throws IOException {
final long lfhOffset = offsets.get(ze);
final boolean needsZip64Extra = hasZip64Extra(ze)
|| ze.getCompressedSize() >= ZIP64_MAGIC
|| ze.getSize() >= ZIP64_MAGIC
|| lfhOffset >= ZIP64_MAGIC
|| zip64Mode == Zip64Mode.Always;
if (needsZip64Extra && zip64Mode == Zip64Mode.Never) {
// must be the offset that is too big, otherwise an
// exception would have been throw in putArchiveEntry or
// closeArchiveEntry
throw new Zip64RequiredException(Zip64RequiredException
.ARCHIVE_TOO_BIG_MESSAGE);
}
handleZip64Extra(ze, lfhOffset, needsZip64Extra);
return createCentralFileHeader(ze, getName(ze), lfhOffset, needsZip64Extra);
}
/**
* Writes the central file header entry.
* @param ze the entry to write
* @param name The encoded name
* @param lfhOffset Local file header offset for this file
* @throws IOException on error
*/
private byte[] createCentralFileHeader(final ZipArchiveEntry ze, final ByteBuffer name, final long lfhOffset,
final boolean needsZip64Extra) throws IOException {
final byte[] extra = ze.getCentralDirectoryExtra();
// file comment length
String comm = ze.getComment();
if (comm == null) {
comm = "";
}
final ByteBuffer commentB = getEntryEncoding(ze).encode(comm);
final int nameLen = name.limit() - name.position();
final int commentLen = commentB.limit() - commentB.position();
final int len= CFH_FILENAME_OFFSET + nameLen + extra.length + commentLen;
final byte[] buf = new byte[len];
System.arraycopy(CFH_SIG, 0, buf, CFH_SIG_OFFSET, WORD);
// version made by
// CheckStyle:MagicNumber OFF
putShort((ze.getPlatform() << 8) | (!hasUsedZip64 ? DATA_DESCRIPTOR_MIN_VERSION : ZIP64_MIN_VERSION),
buf, CFH_VERSION_MADE_BY_OFFSET);
final int zipMethod = ze.getMethod();
final boolean encodable = zipEncoding.canEncode(ze.getName());
putShort(versionNeededToExtract(zipMethod, needsZip64Extra), buf, CFH_VERSION_NEEDED_OFFSET);
getGeneralPurposeBits(zipMethod, !encodable && fallbackToUTF8).encode(buf, CFH_GPB_OFFSET);
// compression method
putShort(zipMethod, buf, CFH_METHOD_OFFSET);
// last mod. time and date
ZipUtil.toDosTime(calendarInstance, ze.getTime(), buf, CFH_TIME_OFFSET);
// CRC
// compressed length
// uncompressed length
putLong(ze.getCrc(), buf, CFH_CRC_OFFSET);
if (ze.getCompressedSize() >= ZIP64_MAGIC
|| ze.getSize() >= ZIP64_MAGIC
|| zip64Mode == Zip64Mode.Always) {
ZipLong.ZIP64_MAGIC.putLong(buf, CFH_COMPRESSED_SIZE_OFFSET);
ZipLong.ZIP64_MAGIC.putLong(buf, CFH_ORIGINAL_SIZE_OFFSET);
} else {
putLong(ze.getCompressedSize(), buf, CFH_COMPRESSED_SIZE_OFFSET);
putLong(ze.getSize(), buf, CFH_ORIGINAL_SIZE_OFFSET);
}
putShort(nameLen, buf, CFH_FILENAME_LENGTH_OFFSET);
// extra field length
putShort(extra.length, buf, CFH_EXTRA_LENGTH_OFFSET);
putShort(commentLen, buf, CFH_COMMENT_LENGTH_OFFSET);
// disk number start
System.arraycopy(ZERO, 0, buf, CFH_DISK_NUMBER_OFFSET, SHORT);
// internal file attributes
putShort(ze.getInternalAttributes(), buf, CFH_INTERNAL_ATTRIBUTES_OFFSET);
// external file attributes
putLong(ze.getExternalAttributes(), buf, CFH_EXTERNAL_ATTRIBUTES_OFFSET);
// relative offset of LFH
if (lfhOffset >= ZIP64_MAGIC || zip64Mode == Zip64Mode.Always) {
putLong(ZIP64_MAGIC, buf, CFH_LFH_OFFSET);
} else {
putLong(Math.min(lfhOffset, ZIP64_MAGIC), buf, CFH_LFH_OFFSET);
}
// file name
System.arraycopy(name.array(), name.arrayOffset(), buf, CFH_FILENAME_OFFSET, nameLen);
final int extraStart = CFH_FILENAME_OFFSET + nameLen;
System.arraycopy(extra, 0, buf, extraStart, extra.length);
final int commentStart = extraStart + extra.length;
// file comment
System.arraycopy(commentB.array(), commentB.arrayOffset(), buf, commentStart, commentLen);
return buf;
}
/**
* If the entry needs Zip64 extra information inside the central
* directory then configure its data.
*/
private void handleZip64Extra(final ZipArchiveEntry ze, final long lfhOffset,
final boolean needsZip64Extra) {
if (needsZip64Extra) {
final Zip64ExtendedInformationExtraField z64 = getZip64Extra(ze);
if (ze.getCompressedSize() >= ZIP64_MAGIC
|| ze.getSize() >= ZIP64_MAGIC
|| zip64Mode == Zip64Mode.Always) {
z64.setCompressedSize(new ZipEightByteInteger(ze.getCompressedSize()));
z64.setSize(new ZipEightByteInteger(ze.getSize()));
} else {
// reset value that may have been set for LFH
z64.setCompressedSize(null);
z64.setSize(null);
}
if (lfhOffset >= ZIP64_MAGIC || zip64Mode == Zip64Mode.Always) {
z64.setRelativeHeaderOffset(new ZipEightByteInteger(lfhOffset));
}
ze.setExtra();
}
}
/**
* Writes the "End of central dir record".
* @throws IOException on error
* @throws Zip64RequiredException if the archive's size exceeds 4
* GByte or there are more than 65535 entries inside the archive
* and {@link Zip64Mode #setUseZip64} is {@link Zip64Mode#Never}.
*/
protected void writeCentralDirectoryEnd() throws IOException {
writeCounted(EOCD_SIG);
// disk numbers
writeCounted(ZERO);
writeCounted(ZERO);
// number of entries
final int numberOfEntries = entries.size();
if (numberOfEntries > ZIP64_MAGIC_SHORT
&& zip64Mode == Zip64Mode.Never) {
throw new Zip64RequiredException(Zip64RequiredException
.TOO_MANY_ENTRIES_MESSAGE);
}
if (cdOffset > ZIP64_MAGIC && zip64Mode == Zip64Mode.Never) {
throw new Zip64RequiredException(Zip64RequiredException
.ARCHIVE_TOO_BIG_MESSAGE);
}
final byte[] num = ZipShort.getBytes(Math.min(numberOfEntries,
ZIP64_MAGIC_SHORT));
writeCounted(num);
writeCounted(num);
// length and location of CD
writeCounted(ZipLong.getBytes(Math.min(cdLength, ZIP64_MAGIC)));
writeCounted(ZipLong.getBytes(Math.min(cdOffset, ZIP64_MAGIC)));
// ZIP file comment
final ByteBuffer data = this.zipEncoding.encode(comment);
final int dataLen = data.limit() - data.position();
writeCounted(ZipShort.getBytes(dataLen));
streamCompressor.writeCounted(data.array(), data.arrayOffset(), dataLen);
}
/**
* Writes the "ZIP64 End of central dir record" and
* "ZIP64 End of central dir locator".
* @throws IOException on error
* @since 1.3
*/
protected void writeZip64CentralDirectory() throws IOException {
if (zip64Mode == Zip64Mode.Never) {
return;
}
if (!hasUsedZip64
&& (cdOffset >= ZIP64_MAGIC || cdLength >= ZIP64_MAGIC
|| entries.size() >= ZIP64_MAGIC_SHORT)) {
// actually "will use"
hasUsedZip64 = true;
}
if (!hasUsedZip64) {
return;
}
final long offset = streamCompressor.getTotalBytesWritten();
writeOut(ZIP64_EOCD_SIG);
// size, we don't have any variable length as we don't support
// the extensible data sector, yet
writeOut(ZipEightByteInteger
.getBytes(SHORT /* version made by */
+ SHORT /* version needed to extract */
+ WORD /* disk number */
+ WORD /* disk with central directory */
+ DWORD /* number of entries in CD on this disk */
+ DWORD /* total number of entries */
+ DWORD /* size of CD */
+ (long) DWORD /* offset of CD */
));
// version made by and version needed to extract
writeOut(ZipShort.getBytes(ZIP64_MIN_VERSION));
writeOut(ZipShort.getBytes(ZIP64_MIN_VERSION));
// disk numbers - four bytes this time
writeOut(LZERO);
writeOut(LZERO);
// number of entries
final byte[] num = ZipEightByteInteger.getBytes(entries.size());
writeOut(num);
writeOut(num);
// length and location of CD
writeOut(ZipEightByteInteger.getBytes(cdLength));
writeOut(ZipEightByteInteger.getBytes(cdOffset));
// no "zip64 extensible data sector" for now
// and now the "ZIP64 end of central directory locator"
writeOut(ZIP64_EOCD_LOC_SIG);
// disk number holding the ZIP64 EOCD record
writeOut(LZERO);
// relative offset of ZIP64 EOCD record
writeOut(ZipEightByteInteger.getBytes(offset));
// total number of disks
writeOut(ONE);
}
/**
* Write bytes to output or random access file.
* @param data the byte array to write
* @throws IOException on error
*/
protected final void writeOut(final byte[] data) throws IOException {
streamCompressor.writeOut(data, 0, data.length);
}
/**
* Write bytes to output or random access file.
* @param data the byte array to write
* @param offset the start position to write from
* @param length the number of bytes to write
* @throws IOException on error
*/
protected final void writeOut(final byte[] data, final int offset, final int length)
throws IOException {
streamCompressor.writeOut(data, offset, length);
}
private GeneralPurposeBit getGeneralPurposeBits(final int zipMethod, final boolean utfFallback) {
final GeneralPurposeBit b = new GeneralPurposeBit();
b.useUTF8ForNames(useUTF8Flag || utfFallback);
if (isDeflatedToOutputStream(zipMethod)) {
b.useDataDescriptor(true);
}
return b;
}
private int versionNeededToExtract(final int zipMethod, final boolean zip64) {
if (zip64) {
return ZIP64_MIN_VERSION;
}
// requires version 2 as we are going to store length info
// in the data descriptor
return (isDeflatedToOutputStream(zipMethod)) ?
DATA_DESCRIPTOR_MIN_VERSION :
INITIAL_VERSION;
}
private boolean isDeflatedToOutputStream(final int zipMethod) {
return zipMethod == DEFLATED && channel == null;
}
/**
* Creates a new zip entry taking some information from the given
* file and using the provided name.
*
* The name will be adjusted to end with a forward slash "/" if
* the file is a directory. If the file is not a directory a
* potential trailing forward slash will be stripped from the
* entry name.
*
* Must not be used if the stream has already been closed.
*/
@Override
public ArchiveEntry createArchiveEntry(final File inputFile, final String entryName)
throws IOException {
if (finished) {
throw new IOException("Stream has already been finished");
}
return new ZipArchiveEntry(inputFile, entryName);
}
/**
* Get the existing ZIP64 extended information extra field or
* create a new one and add it to the entry.
*
* @since 1.3
*/
private Zip64ExtendedInformationExtraField
getZip64Extra(final ZipArchiveEntry ze) {
if (entry != null) {
entry.causedUseOfZip64 = !hasUsedZip64;
}
hasUsedZip64 = true;
Zip64ExtendedInformationExtraField z64 =
(Zip64ExtendedInformationExtraField)
ze.getExtraField(Zip64ExtendedInformationExtraField
.HEADER_ID);
if (z64 == null) {
/*
System.err.println("Adding z64 for " + ze.getName()
+ ", method: " + ze.getMethod()
+ " (" + (ze.getMethod() == STORED) + ")"
+ ", channel: " + (channel != null));
*/
z64 = new Zip64ExtendedInformationExtraField();
}
// even if the field is there already, make sure it is the first one
ze.addAsFirstExtraField(z64);
return z64;
}
/**
* Is there a ZIP64 extended information extra field for the
* entry?
*
* @since 1.3
*/
private boolean hasZip64Extra(final ZipArchiveEntry ze) {
return ze.getExtraField(Zip64ExtendedInformationExtraField
.HEADER_ID)
!= null;
}
/**
* If the mode is AsNeeded and the entry is a compressed entry of
* unknown size that gets written to a non-seekable stream the
* change the default to Never.
*
* @since 1.3
*/
private Zip64Mode getEffectiveZip64Mode(final ZipArchiveEntry ze) {
if (zip64Mode != Zip64Mode.AsNeeded
|| channel != null
|| ze.getMethod() != DEFLATED
|| ze.getSize() != ArchiveEntry.SIZE_UNKNOWN) {
return zip64Mode;
}
return Zip64Mode.Never;
}
private ZipEncoding getEntryEncoding(final ZipArchiveEntry ze) {
final boolean encodable = zipEncoding.canEncode(ze.getName());
return !encodable && fallbackToUTF8
? ZipEncodingHelper.UTF8_ZIP_ENCODING : zipEncoding;
}
private ByteBuffer getName(final ZipArchiveEntry ze) throws IOException {
return getEntryEncoding(ze).encode(ze.getName());
}
/**
* Closes the underlying stream/file without finishing the
* archive, the result will likely be a corrupt archive.
*
* This method only exists to support tests that generate
* corrupt archives so they can clean up any temporary files.
*/
void destroy() throws IOException {
if (channel != null) {
channel.close();
}
if (out != null) {
out.close();
}
}
/**
* enum that represents the possible policies for creating Unicode
* extra fields.
*/
public static final class UnicodeExtraFieldPolicy {
/**
* Always create Unicode extra fields.
*/
public static final UnicodeExtraFieldPolicy ALWAYS = new UnicodeExtraFieldPolicy("always");
/**
* Never create Unicode extra fields.
*/
public static final UnicodeExtraFieldPolicy NEVER = new UnicodeExtraFieldPolicy("never");
/**
* Create Unicode extra fields for filenames that cannot be
* encoded using the specified encoding.
*/
public static final UnicodeExtraFieldPolicy NOT_ENCODEABLE =
new UnicodeExtraFieldPolicy("not encodeable");
private final String name;
private UnicodeExtraFieldPolicy(final String n) {
name = n;
}
@Override
public String toString() {
return name;
}
}
/**
* Structure collecting information for the entry that is
* currently being written.
*/
private static final class CurrentEntry {
private CurrentEntry(final ZipArchiveEntry entry) {
this.entry = entry;
}
/**
* Current ZIP entry.
*/
private final ZipArchiveEntry entry;
/**
* Offset for CRC entry in the local file header data for the
* current entry starts here.
*/
private long localDataStart = 0;
/**
* Data for local header data
*/
private long dataStart = 0;
/**
* Number of bytes read for the current entry (can't rely on
* Deflater#getBytesRead) when using DEFLATED.
*/
private long bytesRead = 0;
/**
* Whether current entry was the first one using ZIP64 features.
*/
private boolean causedUseOfZip64 = false;
/**
* Whether write() has been called at all.
*
* In order to create a valid archive {@link
* #closeArchiveEntry closeArchiveEntry} will write an empty
* array to get the CRC right if nothing has been written to
* the stream at all.
*/
private boolean hasWritten;
}
}