jaroslav@705: /*
jaroslav@705:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
jaroslav@705:  *
jaroslav@705:  * Copyright 1997-2010 Oracle and/or its affiliates. All rights reserved.
jaroslav@705:  *
jaroslav@705:  * Oracle and Java are registered trademarks of Oracle and/or its affiliates.
jaroslav@705:  * Other names may be trademarks of their respective owners.
jaroslav@705:  *
jaroslav@705:  * The contents of this file are subject to the terms of either the GNU
jaroslav@705:  * General Public License Version 2 only ("GPL") or the Common
jaroslav@705:  * Development and Distribution License("CDDL") (collectively, the
jaroslav@705:  * "License"). You may not use this file except in compliance with the
jaroslav@705:  * License. You can obtain a copy of the License at
jaroslav@705:  * http://www.netbeans.org/cddl-gplv2.html
jaroslav@705:  * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
jaroslav@705:  * specific language governing permissions and limitations under the
jaroslav@705:  * License.  When distributing the software, include this License Header
jaroslav@705:  * Notice in each file and include the License file at
jaroslav@705:  * nbbuild/licenses/CDDL-GPL-2-CP.  Oracle designates this
jaroslav@705:  * particular file as subject to the "Classpath" exception as provided
jaroslav@705:  * by Oracle in the GPL Version 2 section of the License file that
jaroslav@705:  * accompanied this code. If applicable, add the following below the
jaroslav@705:  * License Header, with the fields enclosed by brackets [] replaced by
jaroslav@705:  * your own identifying information:
jaroslav@705:  * "Portions Copyrighted [year] [name of copyright owner]"
jaroslav@705:  *
jaroslav@705:  * Contributor(s):
jaroslav@705:  *
jaroslav@705:  * Portions Copyrighted 2007 Sun Microsystems, Inc.
jaroslav@705:  */
jaroslav@706: package org.apidesign.bck2brwsr.emul.zip;
jaroslav@705: 
jaroslav@706: import java.io.ByteArrayInputStream;
jaroslav@705: import java.io.IOException;
jaroslav@705: import java.io.InputStream;
jaroslav@705: import java.util.zip.ZipEntry;
jaroslav@705: import java.util.zip.ZipInputStream;
jaroslav@705: 
jaroslav@705: /**
jaroslav@705:  *
jaroslav@705:  * @author Tomas Zezula
jaroslav@705:  */
jaroslav@705: public final class FastJar {
jaroslav@706:     private final byte[] arr;
jaroslav@705: 
jaroslav@706:     public FastJar(byte[] arr) {
jaroslav@706:         this.arr = arr;
jaroslav@705:     }
jaroslav@705:     
jaroslav@705:     
jaroslav@705:     private static final int GIVE_UP = 1<<16;
jaroslav@705: 
jaroslav@705:     public static final  class Entry {
jaroslav@705:         
jaroslav@705:         public final String name;
jaroslav@705:         final long offset;
jaroslav@705:         private final long dosTime;
jaroslav@705:         
jaroslav@706:         Entry (String name, long offset, long time) {
jaroslav@705:             assert name != null;
jaroslav@705:             this.name = name;
jaroslav@705:             this.offset = offset;
jaroslav@705:             this.dosTime = time;
jaroslav@705:         }        
jaroslav@706: /*        
jaroslav@705:         public long getTime () {
jaroslav@705:             Date d = new Date((int)(((dosTime >> 25) & 0x7f) + 80),
jaroslav@705:                     (int)(((dosTime >> 21) & 0x0f) - 1),
jaroslav@705:                     (int)((dosTime >> 16) & 0x1f),
jaroslav@705:                     (int)((dosTime >> 11) & 0x1f),
jaroslav@705:                     (int)((dosTime >> 5) & 0x3f),
jaroslav@705:                     (int)((dosTime << 1) & 0x3e));
jaroslav@705:             return d.getTime();
jaroslav@705:         }
jaroslav@706:         */
jaroslav@705:     }
jaroslav@705:     
jaroslav@706:     public InputStream getInputStream (final Entry e) throws IOException {
jaroslav@706:         return getInputStream(arr, e.offset);
jaroslav@705:     }
jaroslav@705:     
jaroslav@706:     private static InputStream getInputStream (byte[] arr, final long offset) throws IOException {
jaroslav@706:         ByteArrayInputStream is = new ByteArrayInputStream(arr);
jaroslav@706:         is.skip(offset);
jaroslav@706:         ZipInputStream in = new ZipInputStream (is);
jaroslav@705:         ZipEntry e = in.getNextEntry();
jaroslav@705:         if (e != null && e.getCrc() == 0L && e.getMethod() == ZipEntry.STORED) {
jaroslav@706:             int cp = arr.length - is.available();
jaroslav@706:             return new ByteArrayInputStream(arr, cp, (int)e.getSize());
jaroslav@705:         }
jaroslav@705:         return in;
jaroslav@705:     }
jaroslav@705:     
jaroslav@706:     public Entry[] list() throws IOException {
jaroslav@706:         final int size = arr.length;
jaroslav@706: 
jaroslav@706:         int at = size - ZipInputStream.ENDHDR;
jaroslav@706: 
jaroslav@706:         byte[] data = new byte[ZipInputStream.ENDHDR];        
jaroslav@706:         int giveup = 0;
jaroslav@706: 
jaroslav@706:         do {
jaroslav@706:             org.apidesign.bck2brwsr.emul.lang.System.arraycopy(arr, at, data, 0, data.length);
jaroslav@706:             at--;
jaroslav@706:             giveup++;
jaroslav@706:             if (giveup > GIVE_UP) {
jaroslav@706:                 throw new IOException ();
jaroslav@705:             }
jaroslav@706:         } while (getsig(data) != ZipInputStream.ENDSIG);
jaroslav@706: 
jaroslav@706: 
jaroslav@706:         final long censize = endsiz(data);
jaroslav@706:         final long cenoff  = endoff(data);
jaroslav@706:         at = (int) cenoff;                                                     
jaroslav@706: 
jaroslav@706:         Entry[] result = new Entry[0];
jaroslav@706:         int cenread = 0;
jaroslav@706:         data = new byte[ZipInputStream.CENHDR];
jaroslav@706:         while (cenread < censize) {
jaroslav@706:             org.apidesign.bck2brwsr.emul.lang.System.arraycopy(arr, at, data, 0, data.length);
jaroslav@706:             at += data.length;
jaroslav@706:             if (getsig(data) != ZipInputStream.CENSIG) {
jaroslav@706:                 throw new IOException("No central table");          //NOI18N
jaroslav@706:             }
jaroslav@706:             int cennam = cennam(data);
jaroslav@706:             int cenext = cenext(data);
jaroslav@706:             int cencom = cencom(data);
jaroslav@706:             long lhoff = cenoff(data);
jaroslav@706:             long centim = centim(data);
jaroslav@706:             String name = new String(arr, at, cennam, "UTF-8");
jaroslav@706:             at += cennam;
jaroslav@706:             int seekby = cenext+cencom;
jaroslav@706:             int cendatalen = ZipInputStream.CENHDR + cennam + seekby;
jaroslav@706:             cenread+=cendatalen;
jaroslav@706:             result = addEntry(result, new Entry(name,lhoff, centim));
jaroslav@706:             at += seekby;
jaroslav@705:         }
jaroslav@706:         return result;
jaroslav@705:     }
jaroslav@705: 
jaroslav@706:     private Entry[] addEntry(Entry[] result, Entry entry) {
jaroslav@706:         Entry[] e = new Entry[result.length + 1];
jaroslav@706:         e[result.length] = entry;
jaroslav@706:         org.apidesign.bck2brwsr.emul.lang.System.arraycopy(result, 0, e, 0, result.length);
jaroslav@706:         return e;
jaroslav@705:     }
jaroslav@705: 
jaroslav@705:     private static final long getsig(final byte[] b) throws IOException {return get32(b,0);}
jaroslav@706:     private static final long endsiz(final byte[] b) throws IOException {return get32(b,ZipInputStream.ENDSIZ);}
jaroslav@706:     private static final long endoff(final byte[] b) throws IOException {return get32(b,ZipInputStream.ENDOFF);}
jaroslav@706:     private static final long  cenlen(final byte[] b) throws IOException {return get32(b,ZipInputStream.CENLEN);}
jaroslav@706:     private static final long  censiz(final byte[] b) throws IOException {return get32(b,ZipInputStream.CENSIZ);}
jaroslav@706:     private static final long centim(final byte[] b) throws IOException {return get32(b,ZipInputStream.CENTIM);}
jaroslav@706:     private static final int  cennam(final byte[] b) throws IOException {return get16(b,ZipInputStream.CENNAM);}
jaroslav@706:     private static final int  cenext(final byte[] b) throws IOException {return get16(b,ZipInputStream.CENEXT);}
jaroslav@706:     private static final int  cencom(final byte[] b) throws IOException {return get16(b,ZipInputStream.CENCOM);}
jaroslav@706:     private static final long cenoff (final byte[] b) throws IOException {return get32(b,ZipInputStream.CENOFF);}
jaroslav@706:     private static final int lochow(final byte[] b) throws IOException {return get16(b,ZipInputStream.LOCHOW);}
jaroslav@706:     private static final int locname(final byte[] b) throws IOException {return get16(b,ZipInputStream.LOCNAM);}
jaroslav@706:     private static final int locext(final byte[] b) throws IOException {return get16(b,ZipInputStream.LOCEXT);}
jaroslav@706:     private static final long locsiz(final byte[] b) throws IOException {return get32(b,ZipInputStream.LOCSIZ);}
jaroslav@705:     
jaroslav@705:     private static final int get16(final byte[] b, int off) throws IOException {        
jaroslav@705:         final int b1 = b[off];
jaroslav@705: 	final int b2 = b[off+1];
jaroslav@705:         return (b1 & 0xff) | ((b2 & 0xff) << 8);
jaroslav@705:     }
jaroslav@705: 
jaroslav@705:     private static final long get32(final byte[] b, int off) throws IOException {
jaroslav@705: 	final int s1 = get16(b, off);
jaroslav@705: 	final int s2 = get16(b, off+2);
jaroslav@705:         return s1 | ((long)s2 << 16);
jaroslav@705:     }
jaroslav@705: 
jaroslav@705: }