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296 lines
7.5 KiB
Java
296 lines
7.5 KiB
Java
/* ZipOutputStream.java - Create a file in zip format
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Copyright (C) 1999, 2000 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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As a special exception, if you link this library with other files to
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produce an executable, this library does not by itself cause the
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resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why the
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executable file might be covered by the GNU General Public License. */
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package java.util.zip;
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import java.io.*;
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/* Written using on-line Java Platform 1.2 API Specification
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* and JCL book.
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* Believed complete and correct.
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*/
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public class ZipOutputStream extends DeflaterOutputStream
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implements ZipConstants
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{
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public static final int STORED = 0;
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public static final int DEFLATED = 8;
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public void close () throws IOException
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{
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finish ();
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out.close();
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}
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public void closeEntry () throws IOException
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{
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int uncompressed_size = def.getTotalIn();
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int compressed_size = def.getTotalOut();
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long crc = filter.getChecksum().getValue();
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bytes_written += compressed_size;
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bytes_written += put4 (0x08074b50);
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if (current.getCrc() == -1 || current.getCompressedSize() == -1
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|| current.getSize() == -1)
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{
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current.setCrc(crc);
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current.compressedSize = compressed_size;
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current.setSize(uncompressed_size);
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}
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else
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{
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if (current.getCrc() != crc
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|| current.getCompressedSize() != compressed_size
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|| current.getSize() != uncompressed_size)
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throw new ZipException ("zip entry field incorrect");
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}
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bytes_written += put4 ((int) (current.getCrc()));
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bytes_written += put4 ((int) (current.getCompressedSize()));
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bytes_written += put4 ((int) (current.getSize()));
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current.next = chain;
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chain = current;
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current = null;
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filter = null;
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}
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public void finish () throws IOException
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{
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if (current != null)
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closeEntry ();
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// Write the central directory.
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long offset = bytes_written;
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int count = 0;
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int bytes = 0;
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while (chain != null)
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{
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bytes += write_entry (chain, false);
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++count;
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chain = chain.next;
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}
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// Write the end of the central directory record.
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put4 (0x06054b50);
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// Disk number.
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put2 (0);
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// Another disk number.
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put2 (0);
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put2 (count);
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put4 (bytes);
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put4 ((int) offset);
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byte[] c = comment.getBytes("8859_1");
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put2 (c.length);
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out.write(c);
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out.write((byte) 0);
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}
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// Helper for finish and putNextEntry.
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private int write_entry (ZipEntry entry, boolean is_local)
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throws IOException
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{
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long offset = bytes_written;
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int bytes = put4 (is_local ? 0x04034b50 : 0x02014b50);
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if (! is_local)
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bytes += put_version ();
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bytes += put_version ();
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boolean crc_after = false;
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if (is_local
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&& (entry.getCrc() == -1 || entry.getCompressedSize() == -1
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|| entry.getSize() == -1))
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crc_after = true;
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// For the bits field we always indicate `normal' compression,
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// even if that isn't true.
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bytes += put2 (crc_after ? (1 << 3) : 0);
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bytes += put2 (entry.method);
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bytes += put2(0); // time - FIXME
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bytes += put2(0); // date - FIXME
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if (crc_after)
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{
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// CRC, compressedSize, and Size are always 0 in this header.
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// The actual values are given after the entry.
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bytes += put4 (0);
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bytes += put4 (0);
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bytes += put4 (0);
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}
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else
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{
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bytes += put4 ((int) (entry.getCrc()));
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bytes += put4 ((int) (entry.getCompressedSize()));
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bytes += put4 ((int) (entry.getSize()));
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}
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byte[] name = entry.name.getBytes("8859_1");
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bytes += put2 (name.length);
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bytes += put2 (entry.extra == null ? 0 : entry.extra.length);
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byte[] comment = null;
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if (! is_local)
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{
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if (entry.getComment() == null)
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bytes += put2 (0);
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else
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{
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comment = entry.getComment().getBytes("8859_1");
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bytes += put2 (comment.length);
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}
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// Disk number start.
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bytes += put2 (0);
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// Internal file attributes.
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bytes += put2 (0);
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// External file attributes.
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bytes += put2 (0);
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// Relative offset of local header.
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bytes += put2 ((int) offset);
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}
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out.write (name);
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out.write ((byte) 0);
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bytes += name.length + 1;
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if (entry.extra != null)
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{
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out.write(entry.extra);
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out.write((byte) 0);
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bytes += entry.extra.length + 1;
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}
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if (comment != null)
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{
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out.write(comment);
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out.write((byte) 0);
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bytes += comment.length + 1;
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}
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bytes_written += bytes;
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return bytes;
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}
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public void putNextEntry (ZipEntry entry) throws IOException
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{
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if (current != null)
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closeEntry ();
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if (entry.method < 0 )
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entry.method = method;
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if (entry.method == STORED)
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{
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if (entry.getSize() == -1 || entry.getCrc() == -1)
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throw new ZipException ("required entry not set");
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// Just in case.
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entry.compressedSize = entry.getSize();
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}
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write_entry (entry, true);
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current = entry;
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int compr = (method == STORED) ? Deflater.NO_COMPRESSION : level;
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def.reset();
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def.setLevel(compr);
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filter = new CheckedOutputStream (new DeflaterOutputStream (out, def),
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new CRC32 ());
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}
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public void setLevel (int level)
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{
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if (level != Deflater.DEFAULT_COMPRESSION
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&& (level < Deflater.NO_COMPRESSION
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|| level > Deflater.BEST_COMPRESSION))
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throw new IllegalArgumentException ();
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this.level = level;
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}
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public void setMethod (int method)
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{
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if (method != DEFLATED && method != STORED)
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throw new IllegalArgumentException ();
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this.method = method;
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}
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public void setComment (String comment)
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{
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if (comment.length() > 65535)
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throw new IllegalArgumentException ();
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this.comment = comment;
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}
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public synchronized void write (byte[] buf, int off, int len)
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throws IOException
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{
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if (filter == null)
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throw new ZipException ("no open zip entry");
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filter.write(buf, off, len);
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}
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public ZipOutputStream (OutputStream out)
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{
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super (out);
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def = new Deflater (level, true);
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}
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private int put2 (int i) throws IOException
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{
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out.write (i);
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out.write (i >> 8);
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return 2;
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}
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private int put4 (int i) throws IOException
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{
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out.write (i);
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out.write (i >> 8);
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out.write (i >> 16);
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out.write (i >> 24);
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return 4;
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}
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private int put_version () throws IOException
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{
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// FIXME: for now we assume Unix, and we ignore the version
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// number.
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return put2 (3 << 8);
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}
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// The entry we are currently writing, or null if we've called
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// closeEntry.
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private ZipEntry current;
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// The chain of entries which have been written to this file.
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private ZipEntry chain;
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// The output stream to which data should be sent.
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private CheckedOutputStream filter;
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private int method = DEFLATED;
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private int level = Deflater.DEFAULT_COMPRESSION;
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private String comment = "";
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private long bytes_written;
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// The Deflater we use.
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private Deflater def;
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}
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