From 904d8c2f9c8d6bc8280bce8ba0338b0607bc3da8 Mon Sep 17 00:00:00 2001
From: Michael Petretti
Date: Fri, 20 Jun 2014 16:53:01 +0200
Subject: wrote a CRC32 Class. Not verified yet.

---
 .../satellitedaemon/ftp/FtpUploadWorker.java       |  7 ++-
 .../org/openslx/satellitedaemon/util/CrcFile.java  | 51 ++++++++++++++++++++++
 2 files changed, 54 insertions(+), 4 deletions(-)
 create mode 100644 src/main/java/org/openslx/satellitedaemon/util/CrcFile.java

diff --git a/src/main/java/org/openslx/satellitedaemon/ftp/FtpUploadWorker.java b/src/main/java/org/openslx/satellitedaemon/ftp/FtpUploadWorker.java
index 80e4d1a..13f3ae8 100644
--- a/src/main/java/org/openslx/satellitedaemon/ftp/FtpUploadWorker.java
+++ b/src/main/java/org/openslx/satellitedaemon/ftp/FtpUploadWorker.java
@@ -66,10 +66,9 @@ public class FtpUploadWorker implements Runnable
 						ftpClient.storeFile( image.name, fis );
 						ThriftConnection.finishedUpload( ftpc.username, imDat );
 
-					} catch (IOException e) {
-						log.error("FtpUploadWorker: Error creating the FileInputStream");
-					}
-					finally {
+					} catch ( IOException e ) {
+						log.error( "FtpUploadWorker: Error creating the FileInputStream" );
+					} finally {
 						ftpClient.disconnect();
 						log.info( "FtpUploadWorker: ftpClient disconnected" );
 					}
diff --git a/src/main/java/org/openslx/satellitedaemon/util/CrcFile.java b/src/main/java/org/openslx/satellitedaemon/util/CrcFile.java
new file mode 100644
index 0000000..ab8f190
--- /dev/null
+++ b/src/main/java/org/openslx/satellitedaemon/util/CrcFile.java
@@ -0,0 +1,51 @@
+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;
+
+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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