ZipOutput.java

/*
 * Copyright (C) 2010 Ken Ellinwood
 *
 * Licensed 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 kellinwood.zipio;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.List;
import java.util.LinkedList;
import java.util.HashSet;
import java.util.Set;
import kellinwood.logging.LoggerInterface;
import kellinwood.logging.LoggerManager;

/**
 *
 */
public class ZipOutput 
{

    static LoggerInterface log;

    String outputFilename;
    OutputStream out = null;
    int filePointer = 0;

    List<ZioEntry> entriesWritten = new LinkedList<ZioEntry>();
    Set<String> namesWritten = new HashSet<String>();
    
    public ZipOutput( String filename) throws IOException
    {
        this.outputFilename = filename;
        File ofile = new File( outputFilename);
        init(ofile);
    }
    
    public ZipOutput( File outputFile) throws IOException
    {
        this.outputFilename = outputFile.getAbsolutePath();
        File ofile = outputFile;
        init(ofile);
    }
        
    private void init( File ofile) throws IOException
    {
        if (ofile.exists()) ofile.delete();
        out = new FileOutputStream( ofile);
        if (getLogger().isDebugEnabled()) ZipListingHelper.listHeader( getLogger());
        
    }

    public ZipOutput( OutputStream os) throws IOException
    {
        out = os;
    }
    
    private static LoggerInterface getLogger() {
        if (log == null) log = LoggerManager.getLogger(ZipOutput.class.getName());
        return log;
    }

    public void write( ZioEntry entry) throws IOException {
        String entryName = entry.getName();
        if (namesWritten.contains( entryName)) {
            getLogger().warning("Skipping duplicate file in output: " + entryName);
            return;
        }
        entry.writeLocalEntry( this);
        entriesWritten.add( entry);
        namesWritten.add( entryName);
        if (getLogger().isDebugEnabled()) ZipListingHelper.listEntry( getLogger(), entry);
        
    }


    
    public void close() throws IOException
    {
        CentralEnd centralEnd = new CentralEnd();
        
        centralEnd.centralStartOffset = (int)getFilePointer();
        centralEnd.numCentralEntries = centralEnd.totalCentralEntries = (short)entriesWritten.size();
        
        for (ZioEntry entry : entriesWritten) {
            entry.write( this);
        }
        
        centralEnd.centralDirectorySize = (int)(getFilePointer() - centralEnd.centralStartOffset);
        centralEnd.fileComment = "";
        
        centralEnd.write( this);
        
        if (out != null) try { out.close(); } catch( Throwable t) {}
    }

    public int getFilePointer() throws IOException {
        return filePointer;
    }


    public void writeInt( int value) throws IOException{
        byte[] data = new byte[4];
        for (int i = 0; i < 4; i++) {
            data[i] = (byte)(value & 0xFF);
            value = value >> 8;
        }
        out.write( data);
        filePointer += 4;
    }

    public void writeShort( short value) throws IOException {
        byte[] data = new byte[2];
        for (int i = 0; i < 2; i++) {
            data[i] = (byte)(value & 0xFF);
            value = (short)(value >> 8);
        }
        out.write( data);
        filePointer += 2;
    }

    public void writeString( String value) throws IOException {

        byte[] data = value.getBytes();
        out.write( data);
        filePointer += data.length;
    }

    public void writeBytes( byte[] value) throws IOException {

        out.write( value);
        filePointer += value.length;
    }

    public void writeBytes( byte[] value, int offset, int length) throws IOException {

        out.write( value, offset, length);
        filePointer += length;
    }    

}