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/*
* Copyright (C) 2005-2013 Schlichtherle IT Services.
* All rights reserved. Use is subject to license terms.
*/
package de.schlichtherle.truezip.zip;
import de.schlichtherle.truezip.util.HashMaps;
import edu.umd.cs.findbugs.annotations.CreatesObligation;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.Charset;
import java.util.*;
import javax.annotation.CheckForNull;
import javax.annotation.Nullable;
import javax.annotation.WillCloseWhenClosed;
import javax.annotation.concurrent.ThreadSafe;
/**
* Drop-in replacement for
* {@link java.util.zip.ZipOutputStream java.util.zip.ZipOutputStream}.
*
* This class starts writing ordinary ZIP32 File Format.
* It automatically adds ZIP64 extensions if required,
* i.e. if the file size exceeds 4GB or more than 65535 entries are written.
* This implies that the class may produce ZIP archive files which cannot
* be read by older ZIP implementations.
*
* If the system property {@code de.schlichtherle.truezip.io.zip.zip64ext}
* is set to {@code true} (case is ignored),
* then ZIP64 extensions are always added when writing a ZIP archive file,
* regardless of its size.
* This system property is primarily intended for unit testing purposes.
* During normal operations, it should not be set as many
* third party tools would not treat the redundant ZIP64 extensions
* correctly.
* Note that it's impossible to inhibit ZIP64 extensions.
*
* This class provides some limited support for multithreading: You can read
* its properties from multiple threads, but obviously you cannot concurrently
* write multiple entries at the same time by different threads.
*
* @see ZipFile
* @author Christian Schlichtherle
*/
@ThreadSafe
public class ZipOutputStream extends RawZipOutputStream {
/**
* The number of entries which can be additionally accomodated by
* the internal hash map without resizing it, which is {@value}.
*
* @since TrueZIP 7.3
* @deprecated since TrueZIP 7.5.5
*/
public static final int OVERHEAD_SIZE = HashMaps.OVERHEAD_SIZE;
/**
* The default character set used for entry names and comments in ZIP files.
* This is {@code "UTF-8"} for compatibility with Sun's JDK implementation.
*/
public static final Charset DEFAULT_CHARSET = Constants.DEFAULT_CHARSET;
private static final ZipOutputStreamParameters DEFAULT_PARAM
= new DefaultZipOutputStreamParameters(DEFAULT_CHARSET);
private @CheckForNull ZipCryptoParameters cryptoParameters;
/**
* Constructs a ZIP output stream which decorates the given output stream
* using the {@code "UTF-8"} charset.
*
* @param out The output stream to write the ZIP file to.
*/
@CreatesObligation
@edu.umd.cs.findbugs.annotations.SuppressWarnings("OBL_UNSATISFIED_OBLIGATION")
public ZipOutputStream(@WillCloseWhenClosed OutputStream out) {
super(out, null, DEFAULT_PARAM);
}
/**
* Constructs a ZIP output stream which decorates the given output stream
* using the given charset.
*
* @param out The output stream to write the ZIP file to.
* @param charset the character set to use.
*/
@CreatesObligation
@edu.umd.cs.findbugs.annotations.SuppressWarnings("OBL_UNSATISFIED_OBLIGATION")
public ZipOutputStream(@WillCloseWhenClosed OutputStream out, Charset charset) {
super(out, null, new DefaultZipOutputStreamParameters(charset));
}
/**
* Constructs a ZIP output stream which decorates the given output stream
* and appends to the given ZIP file.
*
* @param out The output stream to write the ZIP file to.
* If {@code appendee} is not {@code null}, then this must be set
* up so that it appends to the same ZIP file from which
* {@code appendee} is reading.
* @param appendee the ZIP file to append to.
* This may already be closed.
*/
@CreatesObligation
@edu.umd.cs.findbugs.annotations.SuppressWarnings("OBL_UNSATISFIED_OBLIGATION")
public ZipOutputStream(@WillCloseWhenClosed OutputStream out, ZipFile appendee) {
super(out, appendee, DEFAULT_PARAM);
if (null == appendee)
throw new NullPointerException();
}
@Override
public synchronized int size() {
return super.size();
}
/**
* Returns a safe enumeration of clones for all entries written so far.
* This method takes a snapshot of the collection of all entries and
* enumerates their clones, so concurrent modifications or state changes
* do not affect this instance, the returned enumeration or the
* enumerated ZIP entries.
*
* @deprecated Use {@link #iterator()} instead.
*/
@SuppressWarnings("dep-ann")
@Override
public synchronized Enumeration entries() {
class CloneEnumeration implements Enumeration {
final Enumeration e
= Collections.enumeration(Collections.list(
ZipOutputStream.super.entries()));
@Override
public boolean hasMoreElements() {
return e.hasMoreElements();
}
@Override
public ZipEntry nextElement() {
return e.nextElement().clone();
}
} // class CloneEnumeration
return new CloneEnumeration();
}
/**
* Returns a safe iteration of clones for all entries written to this ZIP
* file so far.
* This method takes a snapshot of the collection of all entries and
* clones them while iterating, so concurrent modifications or state
* changes do not affect this instance, the returned enumeration or the
* enumerated ZIP entries.
* The iteration does not support element removal.
*/
@Override
public synchronized Iterator iterator() {
class EntryIterator implements Iterator {
final Iterator i;
EntryIterator() {
List l = new ArrayList(ZipOutputStream.super.size());
Iterator si = ZipOutputStream.super.iterator();
while (si.hasNext())
l.add(si.next());
i = l.iterator();
}
@Override
public boolean hasNext() {
return i.hasNext();
}
@Override
public ZipEntry next() {
return i.next().clone();
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
} // class EntryIterator
return new EntryIterator();
}
/**
* Returns a clone of the entry for the given name or {@code null} if no
* entry with this name exists.
*
* @param name the name of the ZIP entry.
*/
@Override
public synchronized ZipEntry getEntry(String name) {
final ZipEntry entry = super.getEntry(name);
return entry != null ? entry.clone() : null;
}
@Override
public synchronized void setComment(String comment) {
super.setComment(comment);
}
@Override
public synchronized String getComment() {
return super.getComment();
}
/**
* {@inheritDoc}
*
* The initial value is {@code ZipEntry#DEFLATED}.
*/
@Override
public synchronized int getMethod() {
return super.getMethod();
}
@Override
public synchronized void setMethod(int method) {
super.setMethod(method);
}
/**
* {@inheritDoc}
*
* The initial value is {@code Deflater#DEFAULT_COMPRESSION}.
*/
@Override
public synchronized int getLevel() {
return super.getLevel();
}
@Override
public synchronized void setLevel(int level) {
super.setLevel(level);
}
@Override
public synchronized @Nullable ZipCryptoParameters getCryptoParameters() {
return cryptoParameters;
}
/**
* Sets the parameters for encryption or authentication of entries.
*
* Note that only {@link WinZipAesParameters WinZip AES encryption} is
* currently supported.
*
* @param cryptoParameters the parameters for encryption or authentication
* of entries.
* @since TrueZIP 7.3
*/
public synchronized void setCryptoParameters(
final @CheckForNull ZipCryptoParameters cryptoParameters) {
this.cryptoParameters = cryptoParameters;
}
@Override
public synchronized long length() {
return super.length();
}
@Override
public synchronized final boolean isBusy() {
return super.isBusy();
}
@Override
public synchronized void putNextEntry(
final ZipEntry entry,
final boolean process)
throws IOException {
super.putNextEntry(entry, process);
}
@Override
public synchronized void write(int b)
throws IOException {
super.write(b);
}
@Override
public synchronized void write(final byte[] b, final int off, final int len)
throws IOException {
super.write(b, off, len);
}
@Override
public synchronized void closeEntry() throws IOException {
super.closeEntry();
}
@Override
public synchronized void finish() throws IOException {
super.finish();
}
@Override
public synchronized void close() throws IOException {
super.close();
}
}