public bool Identify(IFilter imageFilter)
{
Stream stream = imageFilter.GetDataForkStream();
stream.Seek(0, SeekOrigin.Begin);
if (stream.Length < 512)
{
return(false);
}
byte[] qHdrB = new byte[Marshal.SizeOf(qHdr)];
stream.Read(qHdrB, 0, Marshal.SizeOf(qHdr));
qHdr = BigEndianMarshal.ByteArrayToStructureBigEndian <QCow2Header>(qHdrB);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.magic = 0x{0:X8}", qHdr.magic);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.version = {0}", qHdr.version);
return(qHdr.magic == QCOW_MAGIC && (qHdr.version == QCOW_VERSION2 || qHdr.version == QCOW_VERSION3));
}
public bool Create(string path, MediaType mediaType, Dictionary <string, string> options, ulong sectors,
uint sectorSize)
{
if (sectorSize != 512)
{
ErrorMessage = "Unsupported sector size";
return(false);
}
if (!SupportedMediaTypes.Contains(mediaType))
{
ErrorMessage = $"Unsupported media format {mediaType}";
return(false);
}
// TODO: Correct this calculation
if ((sectors * sectorSize) / 65536 > uint.MaxValue)
{
ErrorMessage = "Too many sectors for selected cluster size";
return(false);
}
_imageInfo = new ImageInfo
{
MediaType = mediaType,
SectorSize = sectorSize,
Sectors = sectors
};
try
{
_writingStream = new FileStream(path, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None);
}
catch (IOException e)
{
ErrorMessage = $"Could not create new image file, exception {e.Message}";
return(false);
}
string extension = Path.GetExtension(path);
bool version3 = extension == ".qcow3" || extension == ".qc3";
_qHdr = new QCow2Header
{
magic = QCOW_MAGIC,
version = version3 ? QCOW_VERSION3 : QCOW_VERSION2,
size = sectors * sectorSize,
cluster_bits = 16,
header_length = (uint)Marshal.SizeOf <QCow2Header>()
};
_clusterSize = 1 << (int)_qHdr.cluster_bits;
_clusterSectors = 1 << ((int)_qHdr.cluster_bits - 9);
_l2Bits = (int)(_qHdr.cluster_bits - 3);
_l2Size = 1 << _l2Bits;
_l1Mask = 0;
int c = 0;
_l1Shift = (int)(_l2Bits + _qHdr.cluster_bits);
for (int i = 0; i < 64; i++)
{
_l1Mask <<= 1;
if (c >= 64 - _l1Shift)
{
continue;
}
_l1Mask += 1;
c++;
}
_l2Mask = 0;
for (int i = 0; i < _l2Bits; i++)
{
_l2Mask = (_l2Mask << 1) + 1;
}
_l2Mask <<= (int)_qHdr.cluster_bits;
_sectorMask = 0;
for (int i = 0; i < _qHdr.cluster_bits; i++)
{
_sectorMask = (_sectorMask << 1) + 1;
}
_qHdr.l1_size = (uint)(_qHdr.size >> _l1Shift);
if (_qHdr.l1_size == 0)
{
_qHdr.l1_size = 1;
}
_l1Table = new ulong[_qHdr.l1_size];
ulong clusters = _qHdr.size / (ulong)_clusterSize;
ulong refCountBlocks = (clusters * 2) / (ulong)_clusterSize;
if (refCountBlocks == 0)
{
refCountBlocks = 1;
}
_qHdr.refcount_table_offset = (ulong)_clusterSize;
_qHdr.refcount_table_clusters = (uint)((refCountBlocks * 8) / (ulong)_clusterSize);
if (_qHdr.refcount_table_clusters == 0)
{
_qHdr.refcount_table_clusters = 1;
}
_refCountTable = new ulong[refCountBlocks];
_qHdr.l1_table_offset = _qHdr.refcount_table_offset + (ulong)(_qHdr.refcount_table_clusters * _clusterSize);
ulong l1TableClusters = (_qHdr.l1_size * 8) / (ulong)_clusterSize;
if (l1TableClusters == 0)
{
l1TableClusters = 1;
}
byte[] empty = new byte[_qHdr.l1_table_offset + (l1TableClusters * (ulong)_clusterSize)];
_writingStream.Write(empty, 0, empty.Length);
IsWriting = true;
ErrorMessage = null;
return(true);
}
public bool Open(IFilter imageFilter)
{
Stream stream = imageFilter.GetDataForkStream();
stream.Seek(0, SeekOrigin.Begin);
if (stream.Length < 512)
{
return(false);
}
byte[] qHdrB = new byte[Marshal.SizeOf(qHdr)];
stream.Read(qHdrB, 0, Marshal.SizeOf(qHdr));
qHdr = BigEndianMarshal.ByteArrayToStructureBigEndian <QCow2Header>(qHdrB);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.magic = 0x{0:X8}", qHdr.magic);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.version = {0}", qHdr.version);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.backing_file_offset = {0}", qHdr.backing_file_offset);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.backing_file_size = {0}", qHdr.backing_file_size);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.cluster_bits = {0}", qHdr.cluster_bits);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.size = {0}", qHdr.size);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.crypt_method = {0}", qHdr.crypt_method);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.l1_size = {0}", qHdr.l1_size);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.l1_table_offset = {0}", qHdr.l1_table_offset);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.refcount_table_offset = {0}", qHdr.refcount_table_offset);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.refcount_table_clusters = {0}",
qHdr.refcount_table_clusters);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.nb_snapshots = {0}", qHdr.nb_snapshots);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.snapshots_offset = {0}", qHdr.snapshots_offset);
if (qHdr.version >= QCOW_VERSION3)
{
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.features = {0:X}", qHdr.features);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.compat_features = {0:X}", qHdr.compat_features);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.autoclear_features = {0:X}", qHdr.autoclear_features);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.refcount_order = {0}", qHdr.refcount_order);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.header_length = {0}", qHdr.header_length);
if ((qHdr.features & QCOW_FEATURE_MASK) != 0)
{
throw new
ImageNotSupportedException($"Unknown incompatible features {qHdr.features & QCOW_FEATURE_MASK:X} enabled, not proceeding.");
}
}
if (qHdr.size <= 1)
{
throw new ArgumentOutOfRangeException(nameof(qHdr.size), "Image size is too small");
}
if (qHdr.cluster_bits < 9 || qHdr.cluster_bits > 16)
{
throw new ArgumentOutOfRangeException(nameof(qHdr.cluster_bits),
"Cluster size must be between 512 bytes and 64 Kbytes");
}
if (qHdr.crypt_method > QCOW_ENCRYPTION_AES)
{
throw new ArgumentOutOfRangeException(nameof(qHdr.crypt_method), "Invalid encryption method");
}
if (qHdr.crypt_method > QCOW_ENCRYPTION_NONE)
{
throw new NotImplementedException("AES encrypted images not yet supported");
}
if (qHdr.backing_file_offset != 0)
{
throw new NotImplementedException("Differencing images not yet supported");
}
clusterSize = 1 << (int)qHdr.cluster_bits;
clusterSectors = 1 << ((int)qHdr.cluster_bits - 9);
l2Bits = (int)(qHdr.cluster_bits - 3);
l2Size = 1 << l2Bits;
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.clusterSize = {0}", clusterSize);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.clusterSectors = {0}", clusterSectors);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.qHdr.l1_size = {0}", qHdr.l1_size);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.l2Size = {0}", l2Size);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.sectors = {0}", imageInfo.Sectors);
BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
byte[] l1TableB = new byte[qHdr.l1_size * 8];
stream.Seek((long)qHdr.l1_table_offset, SeekOrigin.Begin);
stream.Read(l1TableB, 0, (int)qHdr.l1_size * 8);
l1Table = new ulong[qHdr.l1_size];
// TODO: Optimize this
DicConsole.DebugWriteLine("QCOW plugin", "Reading L1 table");
for (long i = 0; i < l1Table.LongLength; i++)
{
l1Table[i] = BigEndianBitConverter.ToUInt64(l1TableB, (int)(i * 8));
}
l1Mask = 0;
int c = 0;
l1Shift = (int)(l2Bits + qHdr.cluster_bits);
for (int i = 0; i < 64; i++)
{
l1Mask <<= 1;
if (c >= 64 - l1Shift)
{
continue;
}
l1Mask += 1;
c++;
}
l2Mask = 0;
for (int i = 0; i < l2Bits; i++)
{
l2Mask = (l2Mask << 1) + 1;
}
l2Mask <<= (int)qHdr.cluster_bits;
sectorMask = 0;
for (int i = 0; i < qHdr.cluster_bits; i++)
{
sectorMask = (sectorMask << 1) + 1;
}
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.l1Mask = {0:X}", l1Mask);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.l1Shift = {0}", l1Shift);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.l2Mask = {0:X}", l2Mask);
DicConsole.DebugWriteLine("QCOW plugin", "qHdr.sectorMask = {0:X}", sectorMask);
maxL2TableCache = MAX_CACHE_SIZE / (l2Size * 8);
maxClusterCache = MAX_CACHE_SIZE / clusterSize;
imageStream = stream;
sectorCache = new Dictionary <ulong, byte[]>();
l2TableCache = new Dictionary <ulong, ulong[]>();
clusterCache = new Dictionary <ulong, byte[]>();
imageInfo.CreationTime = imageFilter.GetCreationTime();
imageInfo.LastModificationTime = imageFilter.GetLastWriteTime();
imageInfo.MediaTitle = Path.GetFileNameWithoutExtension(imageFilter.GetFilename());
imageInfo.Sectors = qHdr.size / 512;
imageInfo.SectorSize = 512;
imageInfo.XmlMediaType = XmlMediaType.BlockMedia;
imageInfo.MediaType = MediaType.GENERIC_HDD;
imageInfo.ImageSize = qHdr.size;
imageInfo.Version = $"{qHdr.version}";
imageInfo.Cylinders = (uint)(imageInfo.Sectors / 16 / 63);
imageInfo.Heads = 16;
imageInfo.SectorsPerTrack = 63;
return(true);
}
