From 2cdee4f4023ec003fe65cfa85ebb654f1446ff59 Mon Sep 17 00:00:00 2001
From: Manuel Bentele
Date: Wed, 19 May 2021 09:48:37 +0200
Subject: Rename 'vm.disk' package to 'virtualization.disk'
---
.../java/org/openslx/vm/disk/DiskImageQcow2.java | 232 ---------------------
1 file changed, 232 deletions(-)
delete mode 100644 src/main/java/org/openslx/vm/disk/DiskImageQcow2.java
(limited to 'src/main/java/org/openslx/vm/disk/DiskImageQcow2.java')
diff --git a/src/main/java/org/openslx/vm/disk/DiskImageQcow2.java b/src/main/java/org/openslx/vm/disk/DiskImageQcow2.java
deleted file mode 100644
index e569708..0000000
--- a/src/main/java/org/openslx/vm/disk/DiskImageQcow2.java
+++ /dev/null
@@ -1,232 +0,0 @@
-package org.openslx.vm.disk;
-
-import java.io.RandomAccessFile;
-
-import org.openslx.virtualization.Version;
-
-/**
- * QCOW2 disk image for virtual machines.
- *
- * A QCOW2 disk image consists of a header, one L1 table and several L2 tables used for lookup data
- * clusters in the file via a two-level lookup. The QCOW2 header contains the following fields:
- *
- *
- * 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
- *
- *
- * @author Manuel Bentele
- * @version 1.0
- */
-public class DiskImageQcow2 extends DiskImage
-{
- /**
- * Big endian representation of the big endian QCOW2 magic bytes QFI\xFB.
- */
- private static final int QCOW2_MAGIC = 0x514649fb;
-
- /**
- * Creates a new QCOW2 disk image from an existing QCOW2 image file.
- *
- * @param diskImage file to a QCOW2 disk storing the image content.
- */
- DiskImageQcow2( RandomAccessFile diskImage )
- {
- super( diskImage );
- }
-
- /**
- * Probe specified file with unknown format to be a QCOW2 disk image file.
- *
- * @param diskImage file with unknown format that should be probed.
- * @return state whether file is a QCOW2 disk image or not.
- *
- * @throws DiskImageException cannot probe specified file with unknown format.
- */
- public static boolean probe( RandomAccessFile diskImage ) throws DiskImageException
- {
- final boolean isQcow2ImageFormat;
-
- // goto the beginning of the disk image to read the disk image
- final int diskImageMagic = DiskImageUtils.readInt( diskImage, 0 );
-
- // check if disk image's magic bytes can be found
- if ( diskImageMagic == DiskImageQcow2.QCOW2_MAGIC ) {
- isQcow2ImageFormat = true;
- } else {
- isQcow2ImageFormat = false;
- }
-
- return isQcow2ImageFormat;
- }
-
- @Override
- public boolean isStandalone() throws DiskImageException
- {
- final RandomAccessFile diskFile = this.getDiskImage();
- final long qcowBackingFileOffset = DiskImageUtils.readLong( diskFile, 8 );
- final boolean qcowStandalone;
-
- // check if QCOW2 image does not refer to any backing file
- if ( qcowBackingFileOffset == 0 ) {
- qcowStandalone = true;
- } else {
- qcowStandalone = false;
- }
-
- return qcowStandalone;
- }
-
- @Override
- public boolean isCompressed() throws DiskImageException
- {
- final RandomAccessFile diskFile = this.getDiskImage();
- final boolean qcowUseExtendedL2;
- boolean qcowCompressed = false;
-
- // check if QCOW2 image uses extended L2 tables
- // extended L2 tables are only possible in QCOW2 version 3 header format
- if ( this.getVersion().getMajor() >= Short.valueOf( "3" ) ) {
- // read incompatible feature bits
- final long qcowIncompatibleFeatures = DiskImageUtils.readLong( diskFile, 72 );
-
- // support for extended L2 tables is enabled if bit 4 is set
- qcowUseExtendedL2 = ( ( ( qcowIncompatibleFeatures & 0x000000000010 ) >>> 4 ) == 1 );
- } else {
- qcowUseExtendedL2 = false;
- }
-
- // get number of entries in L1 table
- final int qcowL1TableSize = DiskImageUtils.readInt( diskFile, 36 );
-
- // 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
- final int qcowClusterBits = DiskImageUtils.readInt( diskFile, 20 );
- 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
- final long qcowL1TableOffset = DiskImageUtils.readLong( diskFile, 40 );
-
- // 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
- final long qcowL1TableEntryOffset = qcowL1TableOffset + ( i * qcowL1TableEntrySize );
- final long qcowL1TableEntry = DiskImageUtils.readLong( diskFile, qcowL1TableEntryOffset );
-
- // extract offset (bits 9 - 55) from L1 table entry
- final 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
- final long qcowL2TableEntryOffset = qcowL2TableOffset + ( j * qcowL2TableEntrySize );
- final long qcowL2TableEntry = DiskImageUtils.readLong( diskFile, qcowL2TableEntryOffset );
-
- // 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;
- }
-
- return qcowCompressed;
- }
-
- @Override
- public boolean isSnapshot() throws DiskImageException
- {
- final RandomAccessFile diskFile = this.getDiskImage();
- final int qcowNumSnapshots = DiskImageUtils.readInt( diskFile, 56 );
- final boolean qcowSnapshot;
-
- // check if QCOW2 image contains at least one snapshot
- if ( qcowNumSnapshots == 0 ) {
- qcowSnapshot = true;
- } else {
- qcowSnapshot = false;
- }
-
- return qcowSnapshot;
- }
-
- @Override
- public Version getVersion() throws DiskImageException
- {
- final RandomAccessFile diskFile = this.getDiskImage();
- final int qcowVersion = DiskImageUtils.readInt( diskFile, 4 );
-
- // check QCOW2 file format version
- if ( qcowVersion < 2 || qcowVersion > 3 ) {
- // QCOW2 disk image does not contain a valid QCOW2 version
- final String errorMsg = new String( "Invalid QCOW2 version in header found!" );
- throw new DiskImageException( errorMsg );
- }
-
- return new Version( Integer.valueOf( qcowVersion ).shortValue() );
- }
-
- @Override
- public String getDescription() throws DiskImageException
- {
- // QCOW2 disk image format does not support any disk description
- return null;
- }
-
- @Override
- public ImageFormat getFormat()
- {
- return ImageFormat.QCOW2;
- }
-}
--
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