From aac457735f24129b9113c53ae93a1a11f524b6c0 Mon Sep 17 00:00:00 2001
From: Manuel Bentele
Date: Fri, 8 Jan 2021 13:44:15 +0100
Subject: Add support for QCOW2 images for QEMU

---
 pom.xml                                            |  22 +-
 src/main/java/org/openslx/util/vm/DiskImage.java   | 156 ++++++++++++-
 .../java/org/openslx/util/vm/DiskImageTest.java    | 250 +++++++++++++++++++++
 .../openslx/util/vm/DiskImageTestResources.java    |  16 ++
 src/test/resources/disk/image-default.invalid      |   1 +
 src/test/resources/disk/image-default.qcow2        | Bin 0 -> 196624 bytes
 src/test/resources/disk/image-default.vdi          | Bin 0 -> 4608 bytes
 src/test/resources/disk/image-default.vmdk         | Bin 0 -> 196608 bytes
 .../disk/image_cs-16384_cp-off_l2-off.qcow2        | Bin 0 -> 131072 bytes
 .../disk/image_cs-16384_cp-off_l2-on.qcow2         | Bin 0 -> 115712 bytes
 .../disk/image_cs-16384_cp-on_l2-off.qcow2         | Bin 0 -> 82432 bytes
 .../disk/image_cs-16384_cp-on_l2-on.qcow2          | Bin 0 -> 82432 bytes
 .../disk/image_cs-2097152_cp-off_l2-off.qcow2      | Bin 0 -> 16777216 bytes
 .../disk/image_cs-2097152_cp-off_l2-on.qcow2       | Bin 0 -> 14745600 bytes
 .../disk/image_cs-2097152_cp-on_l2-off.qcow2       | Bin 0 -> 10492416 bytes
 .../disk/image_cs-2097152_cp-on_l2-on.qcow2        | Bin 0 -> 10492416 bytes
 .../disk/image_cs-65536_cp-off_l2-off.qcow2        | Bin 0 -> 524288 bytes
 .../disk/image_cs-65536_cp-off_l2-on.qcow2         | Bin 0 -> 460800 bytes
 .../disk/image_cs-65536_cp-on_l2-off.qcow2         | Bin 0 -> 328192 bytes
 .../disk/image_cs-65536_cp-on_l2-on.qcow2          | Bin 0 -> 328192 bytes
 20 files changed, 433 insertions(+), 12 deletions(-)
 create mode 100644 src/test/java/org/openslx/util/vm/DiskImageTest.java
 create mode 100644 src/test/java/org/openslx/util/vm/DiskImageTestResources.java
 create mode 100644 src/test/resources/disk/image-default.invalid
 create mode 100644 src/test/resources/disk/image-default.qcow2
 create mode 100644 src/test/resources/disk/image-default.vdi
 create mode 100644 src/test/resources/disk/image-default.vmdk
 create mode 100644 src/test/resources/disk/image_cs-16384_cp-off_l2-off.qcow2
 create mode 100644 src/test/resources/disk/image_cs-16384_cp-off_l2-on.qcow2
 create mode 100644 src/test/resources/disk/image_cs-16384_cp-on_l2-off.qcow2
 create mode 100644 src/test/resources/disk/image_cs-16384_cp-on_l2-on.qcow2
 create mode 100644 src/test/resources/disk/image_cs-2097152_cp-off_l2-off.qcow2
 create mode 100644 src/test/resources/disk/image_cs-2097152_cp-off_l2-on.qcow2
 create mode 100644 src/test/resources/disk/image_cs-2097152_cp-on_l2-off.qcow2
 create mode 100644 src/test/resources/disk/image_cs-2097152_cp-on_l2-on.qcow2
 create mode 100644 src/test/resources/disk/image_cs-65536_cp-off_l2-off.qcow2
 create mode 100644 src/test/resources/disk/image_cs-65536_cp-off_l2-on.qcow2
 create mode 100644 src/test/resources/disk/image_cs-65536_cp-on_l2-off.qcow2
 create mode 100644 src/test/resources/disk/image_cs-65536_cp-on_l2-on.qcow2

diff --git a/pom.xml b/pom.xml
index 3ea3522..6daf903 100644
--- a/pom.xml
+++ b/pom.xml
@@ -47,8 +47,8 @@
 				<artifactId>maven-compiler-plugin</artifactId>
 				<version>3.6.1</version>
 				<configuration>
-					<source>1.7</source>
-					<target>1.7</target>
+					<source>1.8</source>
+					<target>1.8</target>
 				</configuration>
 			</plugin>
 			<plugin>
@@ -82,6 +82,14 @@
 				<version>3.0.0-M5</version>
 			</plugin>
 		</plugins>
+		<testResources>
+			<testResource>
+				<directory>${basedir}/src/test/resources</directory>
+				<includes>
+					<include>disk/*</include>
+				</includes>
+			</testResource>
+		</testResources>
 	</build>
 
 	<dependencies>
@@ -126,5 +134,15 @@
 			<artifactId>lz4-java</artifactId>
 			<version>1.4.1</version>
 		</dependency>
+		<dependency>
+			<groupId>commons-io</groupId>
+			<artifactId>commons-io</artifactId>
+			<version>2.8.0</version>
+		</dependency>
+		<dependency>
+			<groupId>com.google.jimfs</groupId>
+			<artifactId>jimfs</artifactId>
+			<version>1.1</version>
+		</dependency>
 	</dependencies>
 </project>
diff --git a/src/main/java/org/openslx/util/vm/DiskImage.java b/src/main/java/org/openslx/util/vm/DiskImage.java
index 15b3800..1602926 100644
--- a/src/main/java/org/openslx/util/vm/DiskImage.java
+++ b/src/main/java/org/openslx/util/vm/DiskImage.java
@@ -26,8 +26,7 @@ public class DiskImage
 
 	public enum ImageFormat
 	{
-		VMDK( "vmdk" ), QCOW2( "qcow2" ), VDI( "vdi" ),
-		DOCKER("dockerfile");
+		VMDK( "vmdk" ), QCOW2( "qcow2" ), VDI( "vdi" ), DOCKER( "dockerfile" );
 
 		public final String extension;
 
@@ -53,7 +52,7 @@ public class DiskImage
 				return VDI;
 			if ( virtId.equals( TConst.VIRT_QEMU ) )
 				return QCOW2;
-			if ( virtId.equals( TConst.VIRT_DOCKER) )
+			if ( virtId.equals( TConst.VIRT_DOCKER ) )
 				return DOCKER;
 			return null;
 		}
@@ -166,17 +165,154 @@ public class DiskImage
 				return;
 			}
 
-			// TODO: qcow
+			// qcow2 disk image
 			file.seek( 0 );
 			if ( file.readInt() == QEMU_MAGIC ) {
-				// dummy values
-				this.isStandalone = true;
-				this.isCompressed = false;
-				this.isSnapshot = false;
+				// 
+				// qcow2 (version 2 and 3) header format:
+				//
+				// magic                   (4 byte)
+				// version                 (4 byte)
+				// backing_file_offset     (8 byte)
+				// backing_file_size       (4 byte)
+				// cluster_bits            (4 byte)
+				// size                    (8 byte)
+				// crypt_method            (4 byte)
+				// l1_size                 (4 byte)
+				// l1_table_offset         (8 byte)
+				// refcount_table_offset   (8 byte)
+				// refcount_table_clusters (4 byte)
+				// nb_snapshots            (4 byte)
+				// snapshots_offset        (8 byte)
+				// incompatible_features   (8 byte)  [*]
+				// compatible_features     (8 byte)  [*]
+				// autoclear_features      (8 byte)  [*]
+				// refcount_order          (8 byte)  [*]
+				// header_length           (4 byte)  [*]
+				//
+				// [*] these fields are only available in the qcow2 version 3 header format
+				// 
+
+				//
+				// check qcow2 file format version
+				//
+				file.seek( 4 );
+				final int qcowVersion = file.readInt();
+				if ( qcowVersion < 2 || qcowVersion > 3 ) {
+					// disk image format is not a qcow2 disk format
+					throw new UnknownImageFormatException();
+				} else {
+					// disk image format is a valid qcow2 disk format
+					this.hwVersion = qcowVersion;
+					this.subFormat = null;
+				}
+
+				//
+				// check if qcow2 image does not refer to any backing file
+				//
+				file.seek( 8 );
+				this.isStandalone = ( file.readLong() == 0 ) ? true : false;
+
+				//
+				// check if qcow2 image does not contain any snapshot
+				//
+				file.seek( 56 );
+				this.isSnapshot = ( file.readInt() == 0 ) ? true : false;
+
+				//
+				// check if qcow2 image uses extended L2 tables
+				//
+				boolean qcowUseExtendedL2 = false;
+
+				// extended L2 tables are only possible in qcow2 version 3 header format
+				if ( qcowVersion == 3 ) {
+					// read incompatible feature bits
+					file.seek( 72 );
+					final long qcowIncompatibleFeatures = file.readLong();
+
+					// support for extended L2 tables is enabled if bit 4 is set
+					qcowUseExtendedL2 = ( ( ( qcowIncompatibleFeatures & 0x000000000010 ) >>> 4 ) == 1 );
+				}
+
+				//
+				// check if qcow2 image contains compressed clusters
+				//
+				boolean qcowCompressed = false;
+
+				// get number of entries in L1 table
+				file.seek( 36 );
+				final int qcowL1TableSize = file.readInt();
+
+				// check if a valid L1 table is present
+				if ( qcowL1TableSize > 0 ) {
+					// qcow2 image contains active L1 table with more than 0 entries: l1_size > 0
+					// search for first L2 table and its first entry to get compression bit
+
+					// get cluster bits to calculate the cluster size
+					file.seek( 20 );
+					final int qcowClusterBits = file.readInt();
+					final int qcowClusterSize = ( 1 << qcowClusterBits );
+
+					// entries of a L1 table have always the size of 8 byte (64 bit)
+					final int qcowL1TableEntrySize = 8;
+
+					// entries of a L2 table have either the size of 8 or 16 byte (64 or 128 bit)
+					final int qcowL2TableEntrySize = ( qcowUseExtendedL2 ) ? 16 : 8;
+
+					// calculate number of L2 table entries
+					final int qcowL2TableSize = qcowClusterSize / qcowL2TableEntrySize;
+
+					// get offset of L1 table
+					file.seek( 40 );
+					long qcowL1TableOffset = file.readLong();
+
+					// check for each L2 table referenced from an L1 table its entries
+					// until a compressed cluster descriptor is found
+					for ( long i = 0; i < qcowL1TableSize; i++ ) {
+						// get offset of current L2 table from the current L1 table entry
+						long qcowL1TableEntryOffset = qcowL1TableOffset + ( i * qcowL1TableEntrySize );
+						file.seek( qcowL1TableEntryOffset );
+						long qcowL1TableEntry = file.readLong();
+
+						// extract offset (bits 9 - 55) from L1 table entry
+						long qcowL2TableOffset = ( qcowL1TableEntry & 0x00fffffffffffe00L );
+
+						if ( qcowL2TableOffset == 0 ) {
+							// L2 table and all clusters described by this L2 table are unallocated
+							continue;
+						}
+
+						// get each L2 table entry and check if it is a compressed cluster descriptor
+						for ( long j = 0; j < qcowL2TableSize; j++ ) {
+							// get current L2 table entry
+							long qcowL2TableEntryOffset = qcowL2TableOffset + ( j * qcowL2TableEntrySize );
+							file.seek( qcowL2TableEntryOffset );
+							long qcowL2TableEntry = file.readLong();
+
+							// extract cluster type (standard or compressed) (bit 62)
+							boolean qcowClusterCompressed = ( ( ( qcowL2TableEntry & 0x4000000000000000L ) >>> 62 ) == 1 );
+
+							// check if qcow2 disk image contains at least one compressed cluster descriptor
+							if ( qcowClusterCompressed ) {
+								qcowCompressed = true;
+								break;
+							}
+						}
+
+						// terminate if one compressed cluster descriptor is already found
+						if ( qcowCompressed ) {
+							break;
+						}
+					}
+				} else {
+					// qcow2 image does not contain an active L1 table with any entry: l1_size = 0
+					qcowCompressed = false;
+				}
+
+				this.isCompressed = qcowCompressed;
 				this.format = ImageFormat.QCOW2;
-				this.subFormat = null;
 				this.diskDescription = null;
-				this.hwVersion = 0;
+
 				return;
 			}
 		}
diff --git a/src/test/java/org/openslx/util/vm/DiskImageTest.java b/src/test/java/org/openslx/util/vm/DiskImageTest.java
new file mode 100644
index 0000000..7537520
--- /dev/null
+++ b/src/test/java/org/openslx/util/vm/DiskImageTest.java
@@ -0,0 +1,250 @@
+package org.openslx.util.vm;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.openslx.util.vm.DiskImage.ImageFormat;
+import org.openslx.util.vm.DiskImage.UnknownImageFormatException;
+
+public class DiskImageTest
+{
+	@Test
+	@DisplayName( "Test detection of VMDK disk image" )
+	public void testVmdkDiskImage() throws FileNotFoundException, IOException, UnknownImageFormatException
+	{
+		File file = DiskImageTestResources.getDiskFile( "image-default.vmdk" );
+		DiskImage image = new DiskImage( file );
+
+		assertEquals( ImageFormat.VMDK.toString(), image.getImageFormat().toString() );
+		assertEquals( true, image.isStandalone );
+		assertEquals( false, image.isSnapshot );
+		assertEquals( false, image.isCompressed );
+		assertEquals( 18, image.hwVersion );
+		assertNull( image.diskDescription );
+	}
+
+	@Test
+	@DisplayName( "Test detection of VDI disk image" )
+	public void testVdiDiskImage() throws FileNotFoundException, IOException, UnknownImageFormatException
+	{
+		DiskImage image = new DiskImage( DiskImageTestResources.getDiskFile( "image-default.vdi" ) );
+
+		assertEquals( ImageFormat.VDI.toString(), image.getImageFormat().toString() );
+		assertEquals( true, image.isStandalone );
+		assertEquals( false, image.isSnapshot );
+		assertEquals( false, image.isCompressed );
+		assertEquals( 0, image.hwVersion );
+		assertNotNull( image.diskDescription );
+	}
+
+	@Test
+	@DisplayName( "Test detection of default QCOW2 disk image" )
+	public void testQcow2DiskImage() throws FileNotFoundException, IOException, UnknownImageFormatException
+	{
+		DiskImage image = new DiskImage( DiskImageTestResources.getDiskFile( "image-default.qcow2" ) );
+
+		assertEquals( ImageFormat.QCOW2.toString(), image.getImageFormat().toString() );
+		assertEquals( true, image.isStandalone );
+		assertEquals( false, image.isSnapshot );
+		assertEquals( false, image.isCompressed );
+		assertEquals( 3, image.hwVersion );
+		assertNull( image.diskDescription );
+	}
+
+	@Test
+	@DisplayName( "Test detection of compressed, 16384 byte cluster QCOW2 disk image with extended L2 tables" )
+	public void testQcow2DetectionL2Compressed16384DiskImage()
+			throws FileNotFoundException, IOException, UnknownImageFormatException
+	{
+		DiskImage image = new DiskImage( DiskImageTestResources.getDiskFile( "image_cs-16384_cp-on_l2-on.qcow2" ) );
+
+		assertEquals( ImageFormat.QCOW2.toString(), image.getImageFormat().toString() );
+		assertEquals( true, image.isStandalone );
+		assertEquals( false, image.isSnapshot );
+		assertEquals( true, image.isCompressed );
+		assertEquals( 3, image.hwVersion );
+		assertNull( image.diskDescription );
+	}
+
+	@Test
+	@DisplayName( "Test detection of compressed, 16384 byte cluster QCOW2 disk image without extended L2 tables" )
+	public void testQcow2DetectionNonL2Compressed16384DiskImage()
+			throws FileNotFoundException, IOException, UnknownImageFormatException
+	{
+		DiskImage image = new DiskImage( DiskImageTestResources.getDiskFile( "image_cs-16384_cp-on_l2-off.qcow2" ) );
+
+		assertEquals( ImageFormat.QCOW2.toString(), image.getImageFormat().toString() );
+		assertEquals( true, image.isStandalone );
+		assertEquals( false, image.isSnapshot );
+		assertEquals( true, image.isCompressed );
+		assertEquals( 3, image.hwVersion );
+		assertNull( image.diskDescription );
+	}
+
+	@Test
+	@DisplayName( "Test detection of non-compressed, 16384 byte cluster QCOW2 disk image with extended L2 tables" )
+	public void testQcow2DetectionL2NonCompressed16384DiskImage()
+			throws FileNotFoundException, IOException, UnknownImageFormatException
+	{
+		DiskImage image = new DiskImage( DiskImageTestResources.getDiskFile( "image_cs-16384_cp-off_l2-on.qcow2" ) );
+
+		assertEquals( ImageFormat.QCOW2.toString(), image.getImageFormat().toString() );
+		assertEquals( true, image.isStandalone );
+		assertEquals( false, image.isSnapshot );
+		assertEquals( false, image.isCompressed );
+		assertEquals( 3, image.hwVersion );
+		assertNull( image.diskDescription );
+	}
+
+	@Test
+	@DisplayName( "Test detection of non-compressed, 16384 byte cluster QCOW2 disk image without extended L2 tables" )
+	public void testQcow2DetectionNonL2NonCompressed16384DiskImage()
+			throws FileNotFoundException, IOException, UnknownImageFormatException
+	{
+		DiskImage image = new DiskImage( DiskImageTestResources.getDiskFile( "image_cs-16384_cp-off_l2-off.qcow2" ) );
+
+		assertEquals( ImageFormat.QCOW2.toString(), image.getImageFormat().toString() );
+		assertEquals( true, image.isStandalone );
+		assertEquals( false, image.isSnapshot );
+		assertEquals( false, image.isCompressed );
+		assertEquals( 3, image.hwVersion );
+		assertNull( image.diskDescription );
+	}
+
+	@Test
+	@DisplayName( "Test detection of compressed, 65536 byte cluster QCOW2 disk image with extended L2 tables" )
+	public void testQcow2DetectionL2Compressed65536DiskImage()
+			throws FileNotFoundException, IOException, UnknownImageFormatException
+	{
+		DiskImage image = new DiskImage( DiskImageTestResources.getDiskFile( "image_cs-65536_cp-on_l2-on.qcow2" ) );
+
+		assertEquals( ImageFormat.QCOW2.toString(), image.getImageFormat().toString() );
+		assertEquals( true, image.isStandalone );
+		assertEquals( false, image.isSnapshot );
+		assertEquals( true, image.isCompressed );
+		assertEquals( 3, image.hwVersion );
+		assertNull( image.diskDescription );
+	}
+
+	@Test
+	@DisplayName( "Test detection of compressed, 65536 byte cluster QCOW2 disk image without extended L2 tables" )
+	public void testQcow2DetectionNonL2Compressed65536DiskImage()
+			throws FileNotFoundException, IOException, UnknownImageFormatException
+	{
+		DiskImage image = new DiskImage( DiskImageTestResources.getDiskFile( "image_cs-65536_cp-on_l2-off.qcow2" ) );
+
+		assertEquals( ImageFormat.QCOW2.toString(), image.getImageFormat().toString() );
+		assertEquals( true, image.isStandalone );
+		assertEquals( false, image.isSnapshot );
+		assertEquals( true, image.isCompressed );
+		assertEquals( 3, image.hwVersion );
+		assertNull( image.diskDescription );
+	}
+
+	@Test
+	@DisplayName( "Test detection of non-compressed, 65536 byte cluster QCOW2 disk image with extended L2 tables" )
+	public void testQcow2DetectionL2NonCompressed65536DiskImage()
+			throws FileNotFoundException, IOException, UnknownImageFormatException
+	{
+		DiskImage image = new DiskImage( DiskImageTestResources.getDiskFile( "image_cs-65536_cp-off_l2-on.qcow2" ) );
+
+		assertEquals( ImageFormat.QCOW2.toString(), image.getImageFormat().toString() );
+		assertEquals( true, image.isStandalone );
+		assertEquals( false, image.isSnapshot );
+		assertEquals( false, image.isCompressed );
+		assertEquals( 3, image.hwVersion );
+		assertNull( image.diskDescription );
+	}
+
+	@Test
+	@DisplayName( "Test detection of non-compressed, 65536 byte cluster QCOW2 disk image without extended L2 tables" )
+	public void testQcow2DetectionNonL2NonCompressed65536DiskImage()
+			throws FileNotFoundException, IOException, UnknownImageFormatException
+	{
+		DiskImage image = new DiskImage( DiskImageTestResources.getDiskFile( "image_cs-65536_cp-off_l2-off.qcow2" ) );
+
+		assertEquals( ImageFormat.QCOW2.toString(), image.getImageFormat().toString() );
+		assertEquals( true, image.isStandalone );
+		assertEquals( false, image.isSnapshot );
+		assertEquals( false, image.isCompressed );
+		assertEquals( 3, image.hwVersion );
+		assertNull( image.diskDescription );
+	}
+
+	@Test
+	@DisplayName( "Test detection of compressed, 2097152 byte cluster QCOW2 disk image with extended L2 tables" )
+	public void testQcow2DetectionL2Compressed2097152DiskImage()
+			throws FileNotFoundException, IOException, UnknownImageFormatException
+	{
+		DiskImage image = new DiskImage( DiskImageTestResources.getDiskFile( "image_cs-2097152_cp-on_l2-on.qcow2" ) );
+
+		assertEquals( ImageFormat.QCOW2.toString(), image.getImageFormat().toString() );
+		assertEquals( true, image.isStandalone );
+		assertEquals( false, image.isSnapshot );
+		assertEquals( true, image.isCompressed );
+		assertEquals( 3, image.hwVersion );
+		assertNull( image.diskDescription );
+	}
+
+	@Test
+	@DisplayName( "Test detection of compressed, 2097152 byte cluster QCOW2 disk image without extended L2 tables" )
+	public void testQcow2DetectionNonL2Compressed2097152DiskImage()
+			throws FileNotFoundException, IOException, UnknownImageFormatException
+	{
+		DiskImage image = new DiskImage( DiskImageTestResources.getDiskFile( "image_cs-2097152_cp-on_l2-off.qcow2" ) );
+
+		assertEquals( ImageFormat.QCOW2.toString(), image.getImageFormat().toString() );
+		assertEquals( true, image.isStandalone );
+		assertEquals( false, image.isSnapshot );
+		assertEquals( true, image.isCompressed );
+		assertEquals( 3, image.hwVersion );
+		assertNull( image.diskDescription );
+	}
+
+	@Test
+	@DisplayName( "Test detection of non-compressed, 2097152 byte cluster QCOW2 disk image with extended L2 tables" )
+	public void testQcow2DetectionL2NonCompressed2097152DiskImage()
+			throws FileNotFoundException, IOException, UnknownImageFormatException
+	{
+		DiskImage image = new DiskImage( DiskImageTestResources.getDiskFile( "image_cs-2097152_cp-off_l2-on.qcow2" ) );
+
+		assertEquals( ImageFormat.QCOW2.toString(), image.getImageFormat().toString() );
+		assertEquals( true, image.isStandalone );
+		assertEquals( false, image.isSnapshot );
+		assertEquals( false, image.isCompressed );
+		assertEquals( 3, image.hwVersion );
+		assertNull( image.diskDescription );
+	}
+
+	@Test
+	@DisplayName( "Test detection of non-compressed, 2097152 byte cluster QCOW2 disk image without extended L2 tables" )
+	public void testQcow2DetectionNonL2NonCompressed2097152DiskImage()
+			throws FileNotFoundException, IOException, UnknownImageFormatException
+	{
+		DiskImage image = new DiskImage( DiskImageTestResources.getDiskFile( "image_cs-2097152_cp-off_l2-off.qcow2" ) );
+
+		assertEquals( ImageFormat.QCOW2.toString(), image.getImageFormat().toString() );
+		assertEquals( true, image.isStandalone );
+		assertEquals( false, image.isSnapshot );
+		assertEquals( false, image.isCompressed );
+		assertEquals( 3, image.hwVersion );
+		assertNull( image.diskDescription );
+	}
+
+	@Test
+	@DisplayName( "Test of invalid disk image" )
+	public void testInvalidDiskImage() throws FileNotFoundException, IOException, UnknownImageFormatException
+	{
+		Assertions.assertThrows( UnknownImageFormatException.class, () -> {
+			new DiskImage( DiskImageTestResources.getDiskFile( "image-default.invalid" ) );
+		} );
+	}
+}
diff --git a/src/test/java/org/openslx/util/vm/DiskImageTestResources.java b/src/test/java/org/openslx/util/vm/DiskImageTestResources.java
new file mode 100644
index 0000000..1f164bd
--- /dev/null
+++ b/src/test/java/org/openslx/util/vm/DiskImageTestResources.java
@@ -0,0 +1,16 @@
+package org.openslx.util.vm;
+
+import java.io.File;
+import java.net.URL;
+
+public class DiskImageTestResources
+{
+	private static final String DISK_PREFIX_PATH = File.separator + "disk";
+
+	public static File getDiskFile( String diskFileName )
+	{
+		String diskPath = DiskImageTestResources.DISK_PREFIX_PATH + File.separator + diskFileName;
+		URL disk = DiskImageTestResources.class.getResource( diskPath );
+		return new File( disk.getFile() );
+	}
+}
diff --git a/src/test/resources/disk/image-default.invalid b/src/test/resources/disk/image-default.invalid
new file mode 100644
index 0000000..0402ef7
--- /dev/null
+++ b/src/test/resources/disk/image-default.invalid
@@ -0,0 +1 @@
+UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU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