| /* |
| * The Apache Software License, Version 1.1 |
| * |
| * Copyright (c) 2001 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, if |
| * any, must include the following acknowlegement: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowlegement may appear in the software itself, |
| * if and wherever such third-party acknowlegements normally appear. |
| * |
| * 4. The names "The Jakarta Project", "Ant", and "Apache Software |
| * Foundation" must not be used to endorse or promote products derived |
| * from this software without prior written permission. For written |
| * permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache" |
| * nor may "Apache" appear in their names without prior written |
| * permission of the Apache Group. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| */ |
| |
| package org.apache.tools.zip; |
| |
| import java.util.Hashtable; |
| import java.util.Vector; |
| import java.util.zip.ZipException; |
| |
| /** |
| * ZipExtraField related methods |
| * |
| * @author <a href="stefan.bodewig@epost.de">Stefan Bodewig</a> |
| * @version $Revision$ |
| */ |
| public class ExtraFieldUtils { |
| |
| /** |
| * Static registry of known extra fields. |
| * |
| * @since 1.1 |
| */ |
| private static Hashtable implementations; |
| |
| static { |
| implementations = new Hashtable(); |
| register(AsiExtraField.class); |
| } |
| |
| /** |
| * Register a ZipExtraField implementation. |
| * |
| * <p>The given class must have a no-arg constructor and implement |
| * the {@link ZipExtraField ZipExtraField interface}.</p> |
| * |
| * @since 1.1 |
| */ |
| public static void register(Class c) { |
| try { |
| ZipExtraField ze = (ZipExtraField) c.newInstance(); |
| implementations.put(ze.getHeaderId(), c); |
| } catch (ClassCastException cc) { |
| throw new RuntimeException(c + |
| " doesn\'t implement ZipExtraField"); |
| } catch (InstantiationException ie) { |
| throw new RuntimeException(c + " is not a concrete class"); |
| } catch (IllegalAccessException ie) { |
| throw new RuntimeException(c + |
| "\'s no-arg constructor is not public"); |
| } |
| } |
| |
| /** |
| * Create an instance of the approriate ExtraField, falls back to |
| * {@link UnrecognizedExtraField UnrecognizedExtraField}. |
| * |
| * @since 1.1 |
| */ |
| public static ZipExtraField createExtraField(ZipShort headerId) |
| throws InstantiationException, IllegalAccessException { |
| Class c = (Class) implementations.get(headerId); |
| if (c != null) { |
| return (ZipExtraField) c.newInstance(); |
| } |
| UnrecognizedExtraField u = new UnrecognizedExtraField(); |
| u.setHeaderId(headerId); |
| return u; |
| } |
| |
| /** |
| * Split the array into ExtraFields and populate them with the |
| * give data. |
| * |
| * @since 1.1 |
| */ |
| public static ZipExtraField[] parse(byte[] data) throws ZipException { |
| Vector v = new Vector(); |
| int start = 0; |
| while (start <= data.length-4) { |
| ZipShort headerId = new ZipShort(data, start); |
| int length = (new ZipShort(data, start+2)).getValue(); |
| if (start+4+length > data.length) { |
| throw new ZipException("data starting at "+start+" is in unknown format"); |
| } |
| try { |
| ZipExtraField ze = createExtraField(headerId); |
| ze.parseFromLocalFileData(data, start+4, length); |
| v.addElement(ze); |
| } catch (InstantiationException ie) { |
| throw new ZipException(ie.getMessage()); |
| } catch (IllegalAccessException iae) { |
| throw new ZipException(iae.getMessage()); |
| } |
| start += (length+4); |
| } |
| if (start != data.length) { // array not exhausted |
| throw new ZipException("data starting at "+start+" is in unknown format"); |
| } |
| |
| ZipExtraField[] result = new ZipExtraField[v.size()]; |
| v.copyInto(result); |
| return result; |
| } |
| |
| /** |
| * Merges the local file data fields of the given ZipExtraFields. |
| * |
| * @since 1.1 |
| */ |
| public static byte[] mergeLocalFileDataData(ZipExtraField[] data) { |
| int sum = 4*data.length; |
| for (int i=0; i<data.length; i++) { |
| sum += data[i].getLocalFileDataLength().getValue(); |
| } |
| byte[] result = new byte[sum]; |
| int start = 0; |
| for (int i=0; i<data.length; i++) { |
| System.arraycopy(data[i].getHeaderId().getBytes(), |
| 0, result, start, 2); |
| System.arraycopy(data[i].getLocalFileDataLength().getBytes(), |
| 0, result, start+2, 2); |
| byte[] local = data[i].getLocalFileDataData(); |
| System.arraycopy(local, 0, result, start+4, local.length); |
| start += (local.length+4); |
| } |
| return result; |
| } |
| |
| /** |
| * Merges the central directory fields of the given ZipExtraFields. |
| * |
| * @since 1.1 |
| */ |
| public static byte[] mergeCentralDirectoryData(ZipExtraField[] data) { |
| int sum = 4*data.length; |
| for (int i=0; i<data.length; i++) { |
| sum += data[i].getCentralDirectoryLength().getValue(); |
| } |
| byte[] result = new byte[sum]; |
| int start = 0; |
| for (int i=0; i<data.length; i++) { |
| System.arraycopy(data[i].getHeaderId().getBytes(), |
| 0, result, start, 2); |
| System.arraycopy(data[i].getCentralDirectoryLength().getBytes(), |
| 0, result, start+2, 2); |
| byte[] local = data[i].getCentralDirectoryData(); |
| System.arraycopy(local, 0, result, start+4, local.length); |
| start += (local.length+4); |
| } |
| return result; |
| } |
| } |