import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.HashMap;
import java.util.Map;
import net.sf.sevenzipjbinding.ArchiveFormat;
import net.sf.sevenzipjbinding.IArchiveOpenCallback;
import net.sf.sevenzipjbinding.IArchiveOpenVolumeCallback;
import net.sf.sevenzipjbinding.IInArchive;
import net.sf.sevenzipjbinding.IInStream;
import net.sf.sevenzipjbinding.PropID;
import net.sf.sevenzipjbinding.SevenZip;
import net.sf.sevenzipjbinding.SevenZipException;
import net.sf.sevenzipjbinding.impl.RandomAccessFileInStream;
public class OpenMultipartArchiveRar {
private static class ArchiveOpenVolumeCallback
implements IArchiveOpenVolumeCallback, IArchiveOpenCallback {
/**
* Cache for opened file streams
*/
private Map<String, RandomAccessFile> openedRandomAccessFileList =
new HashMap<String, RandomAccessFile>();
/**
* Name of the last volume returned by {@link #getStream(String)}
*/
private String name ;
/**
* This method should at least provide the name of the last
* opened volume (propID=PropID.NAME).
*
* @see IArchiveOpenVolumeCallback#getProperty(PropID)
*/
public Object getProperty(PropID propID) throws SevenZipException {
switch (propID) {
case NAME:
return name ;
}
return null;
}
/**
* The name of the required volume will be calculated out of the
* name of the first volume and a volume index. In case of RAR file,
* the substring ".partNN." in the name of the volume file will
* indicate a volume with id NN. For example:
* <ul>
* <li>test.rar - single part archive or multi-part archive with
* a single volume</li>
* <li>test.part23.rar - 23-th part of a multi-part archive</li>
* <li>test.part001.rar - first part of a multi-part archive.
* "00" indicates, that at least 100 volumes must exist.</li>
* </ul>
*/
public IInStream getStream(String filename) throws SevenZipException {
try {
// We use caching of opened streams, so check cache first
RandomAccessFile randomAccessFile = openedRandomAccessFileList
.get(filename);
if (randomAccessFile != null) { // Cache hit.
// Move the file pointer back to the beginning
// in order to emulating new stream
randomAccessFile.seek(0);
// Save current volume name in case getProperty() will be called
name = filename;
return new RandomAccessFileInStream(randomAccessFile);
}
// Nothing useful in cache. Open required volume.
randomAccessFile = new RandomAccessFile(filename, "r");
// Put new stream in the cache
openedRandomAccessFileList.put(filename, randomAccessFile);
// Save current volume name in case getProperty() will be called
name = filename;
return new RandomAccessFileInStream(randomAccessFile);
} catch (FileNotFoundException fileNotFoundException) {
// Required volume doesn't exist. This happens if the volume:
// 1. never exists. 7-Zip doesn't know how many volumes should
// exist, so it have to try each volume.
// 2. should be there, but doesn't. This is an error case.
// Since normal and error cases are possible,
// we can't throw an error message
return null; // We return always null in this case
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
* Close all opened streams
*/
void close() throws IOException {
for (RandomAccessFile file : openedRandomAccessFileList.values()) {
file.close();
}
}
public void setCompleted(Long files, Long bytes) throws SevenZipException {
}
public void setTotal(Long files, Long bytes) throws SevenZipException {
}
}
public static void main(String[] args) {
if (args.length == 0) {
System.out.println(
"Usage: java OpenMultipartArchiveRar <first-volume>");
return;
}
ArchiveOpenVolumeCallback archiveOpenVolumeCallback = null;
IInArchive inArchive = null;
try {
archiveOpenVolumeCallback = new ArchiveOpenVolumeCallback();
IInStream inStream = archiveOpenVolumeCallback.getStream(args[0]);
inArchive = SevenZip.openInArchive(ArchiveFormat.RAR, inStream,
archiveOpenVolumeCallback);
System.out.println(" Size | Compr.Sz. | Filename");
System.out.println("----------+-----------+---------");
int itemCount = inArchive.getNumberOfItems();
for (int i = 0; i < itemCount; i++) {
System.out.println(String.format("%9s | %9s | %s",
inArchive.getProperty(i, PropID.SIZE),
inArchive.getProperty(i, PropID.PACKED_SIZE),
inArchive.getProperty(i, PropID.PATH)));
}
} catch (Exception e) {
System.err.println("Error occurs: " + e);
} finally {
if (inArchive != null) {
try {
inArchive.close();
} catch (SevenZipException e) {
System.err.println("Error closing archive: " + e);
}
}
if (archiveOpenVolumeCallback != null) {
try {
archiveOpenVolumeCallback.close();
} catch (IOException e) {
System.err.println("Error closing file: " + e);
}
}
}
}
}
