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package org.openslx.satellitedaemon.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.util.zip.CRC32;
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.Logger;
// TODO: Merge with code/classes from masterser and put into master-sync-shared
public class CrcFile
{
private static Logger log = Logger.getLogger( CrcFile.class );
public static void make( String path ) throws IOException
{
int blockSize = 16 * 1024 * 1024;
InputStream is = new FileInputStream( path );
CRC32 crc = new CRC32();
int cnt;
byte[] block = new byte[blockSize];
byte[] WriteToFile = new byte[0];
log.info( "Inputfile: " + path );
while ( ( cnt = is.read(block) ) != -1 ) {
crc.update( cnt );
log.info( "CRC value: " + crc.getValue() );
byte[] latest = ByteBuffer.allocate(8).putLong(crc.getValue()).array();
WriteToFile = concatenateByteArrays( WriteToFile, latest );
}
String outPath = path.substring( 0, (path.length() - 4) ).concat( "crc" );
File outFile = new File(outPath);
FileOutputStream fos = new FileOutputStream( outFile );
fos.write( WriteToFile );
is.close();
fos.close();
}
public static void main( String[] args ) throws IOException {
BasicConfigurator.configure();
CrcFile.make( "/tmp/test.vmdk");
}
public static byte[] concatenateByteArrays(byte[] a, byte[] b) {
byte[] result = new byte[a.length + b.length];
System.arraycopy(a, 0, result, 0, a.length);
System.arraycopy(b, 0, result, a.length, b.length);
return result;
}
}
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