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/*
* IzPack - Copyright 2001-2008 Julien Ponge, All Rights Reserved.
*
* http://izpack.org/ http://izpack.codehaus.org/
*
* Copyright 2007 Dennis Reil
*
* 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 com.izforge.izpack.io;
import com.izforge.izpack.util.Debug;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.GZIPInputStream;
/**
* An inputstream which transparently spans over multiple volumes. The amount of volumes has to be
* specified
*
* @author Dennis Reil,
*/
public class FileSpanningInputStream extends InputStream
{
private static final int EOF = -1;
protected FileInputStream fileinputstream;
protected String volumename;
protected int currentvolumeindex;
protected int volumestotal;
protected static boolean nextvolumenotfound = false;
protected long filepointer;
protected GZIPInputStream zippedinputstream;
protected byte[] magicnumber;
public FileSpanningInputStream(File volume, int volumestotal) throws IOException
{
fileinputstream = new FileInputStream(volume);
zippedinputstream = new GZIPInputStream(fileinputstream);
currentvolumeindex = 0;
volumename = volume.getAbsolutePath();
this.volumestotal = volumestotal;
filepointer = 0;
// read magic number
this.magicnumber = new byte[FileSpanningOutputStream.MAGIC_NUMER_LENGTH];
zippedinputstream.read(this.magicnumber);
// this.read(this.magicnumber);
Debug.trace("Opening stream to " + volume + " magicnr is " + magicnumber);
// reset filepointer
filepointer = 0;
}
public FileSpanningInputStream(String volumename, int volumestotal) throws IOException
{
this(new File(volumename), volumestotal);
}
/**
* checks if the MagicNumber of this stream is valid. The stream has to be opened right before.
*
* @return wether the magic number is valid or not
* @throws IOException
*/
private boolean isMagicNumberValid() throws IOException
{
Debug.trace("trying to read magic number");
boolean valid = false;
byte[] magicnumberofvolume = new byte[FileSpanningOutputStream.MAGIC_NUMER_LENGTH];
long oldfilepointer = this.filepointer;
// this.read(magicnumberofvolume);
this.zippedinputstream.read(magicnumberofvolume);
this.filepointer = oldfilepointer;
Debug.trace("MagicNr is " + magicnumberofvolume);
if ((magicnumberofvolume != null) && (this.magicnumber != null))
{
if (magicnumberofvolume.length != this.magicnumber.length)
{
// magicnumbers aren't valid
valid = false;
}
else
{
boolean errorfound = false;
// check if magicnumbers are identical
for (int i = 0; i < magicnumberofvolume.length; i++)
{
byte op1 = magicnumberofvolume[i];
byte op2 = this.magicnumber[i];
if (op1 != op2)
{
errorfound = true;
break;
}
}
valid = !errorfound;
}
}
return valid;
}
/**
* creates an inputstream to the next volume
*
* @return true - an inputstream to the next volume has been created false - the last volume was
* reached
* @throws IOException
*/
private boolean createInputStreamToNextVolume() throws IOException
{
currentvolumeindex++;
// have we reached the last volume?
if (currentvolumeindex >= volumestotal)
{
Debug.trace("last volume reached.");
return false;
}
// the next volume name
String nextvolumename = volumename + "." + currentvolumeindex;
Debug.trace("Trying to use next volume: " + nextvolumename);
File nextvolumefile = new File(nextvolumename);
if (!nextvolumefile.exists())
{
currentvolumeindex--;
nextvolumenotfound = true;
Debug.trace("volume not found");
throw new VolumeNotFoundException(nextvolumename + "was not found.", nextvolumename);
}
Debug.trace("next volume found.");
// try to open new stream to next volume
fileinputstream = new FileInputStream(nextvolumefile);
zippedinputstream = new GZIPInputStream(fileinputstream);
// check magic number
if (!this.isMagicNumberValid())
{
currentvolumeindex--;
nextvolumenotfound = true;
Debug
.trace("volume found, but magic number incorrect. Maybe not a volume of the same version.");
throw new CorruptVolumeException(nextvolumename
+ "was found, but has magic number error. Maybe not the right version?",
nextvolumename);
}
// everything fine
nextvolumenotfound = false;
return true;
}
/*
* (non-Javadoc)
*
* @see java.io.InputStream#available()
*/
public int available() throws IOException
{
if (nextvolumenotfound)
{
createInputStreamToNextVolume();
}
// return fileinputstream.available();
return zippedinputstream.available();
}
/*
* (non-Javadoc)
*
* @see java.io.InputStream#close()
*/
public void close() throws IOException
{
zippedinputstream.close();
fileinputstream.close();
}
/*
* (non-Javadoc)
*
* @see java.io.InputStream#read()
*/
public int read() throws IOException
{
if (nextvolumenotfound)
{
// the next volume was not found, so try to create a new input stream to next volume
createInputStreamToNextVolume();
}
int nextbyte = zippedinputstream.read();
filepointer++;
if (nextbyte == EOF)
{
// if end of file is reached, try to open InputStream to next volume
// close the inputstream
try
{
zippedinputstream.close();
}
catch (Exception e)
{
// do nothing
}
if (createInputStreamToNextVolume())
{
// try to read next byte
nextbyte = zippedinputstream.read();
filepointer++;
}
}
return nextbyte;
}
/*
* (non-Javadoc)
*
* @see java.io.InputStream#read(byte[], int, int)
*/
public int read(byte[] b, int off, int len) throws IOException
{
if (nextvolumenotfound)
{
// the next volume was not found, so try to create a new input stream to next volume
createInputStreamToNextVolume();
}
int bytesread = zippedinputstream.read(b, off, len);
filepointer += bytesread;
if (bytesread == EOF)
{
filepointer++; // bytesread was -1;
System.out.println("EOF reached.");
// close the inputstream
try
{
zippedinputstream.close();
}
catch (Exception e)
{
// do nothing
}
// try to open next volume
if (createInputStreamToNextVolume())
{
// try to read next bytes
Debug.trace("next volume opened, continuing read");
bytesread = zippedinputstream.read(b, off, len);
filepointer += bytesread;
// System.out.println("read into buffer: " + bytesread + " Bytes");
}
}
// System.out.println("return from read into buffer: " + bytesread + " Bytes");
return bytesread;
}
/*
* (non-Javadoc)
*
* @see java.io.InputStream#read(byte[])
*/
public int read(byte[] b) throws IOException
{
return this.read(b, 0, b.length);
}
/*
* (non-Javadoc)
*
* @see java.io.InputStream#skip(long)
*/
public long skip(long n) throws IOException
{
if (nextvolumenotfound)
{
// the next volume was not found, so try to create a new input stream to next volume
createInputStreamToNextVolume();
}
long bytesskipped = 0;
byte[] buffer = new byte[4096];
try
{
while (bytesskipped < n)
{
int maxBytes = (int) Math.min(n - bytesskipped, buffer.length);
int bytesInBuffer = this.read(buffer, 0, maxBytes);
if (bytesInBuffer == -1)
{
throw new IOException("Unexpected end of stream (installer corrupted?)");
}
bytesskipped += bytesInBuffer;
}
}
catch (VolumeNotFoundException vnfe)
{
vnfe.setAlreadyskippedbytes(bytesskipped);
throw vnfe;
}
return bytesskipped;
}
/**
* Returns the name of the volume
*
* @return the name of the volume
*/
public String getVolumename()
{
return volumename;
}
/**
* Sets the volumename
*
* @param volumename
*/
public void setVolumename(String volumename)
{
Debug.trace("new volumename: " + volumename);
// try to get the volumename from the given volume file
// the first volume has no suffix, additional volumes have a .INDEX# suffix
String volumesuffix = "." + currentvolumeindex;
String nextvolumesuffix = "." + (currentvolumeindex + 1);
if (volumename.endsWith(volumesuffix))
{
this.volumename = volumename.substring(0, volumename.lastIndexOf(volumesuffix));
}
else if (volumename.endsWith(nextvolumesuffix))
{
this.volumename = volumename.substring(0, volumename.lastIndexOf(nextvolumesuffix));
}
else
{
this.volumename = volumename;
}
Debug.trace("Set volumename to: " + this.volumename);
}
/**
* Returns the current position in the file. Notice: this is the global position in all volumes.
*
* @return the current position in file.
*/
public long getFilepointer()
{
return filepointer;
}
}
