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 <QCow2Header>()];
stream.Read(qHdrB, 0, Marshal.SizeOf <QCow2Header>());
_qHdr = Marshal.SpanToStructureBigEndian <QCow2Header>(qHdrB);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.magic = 0x{0:X8}", _qHdr.magic);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.version = {0}", _qHdr.version);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.backing_file_offset = {0}", _qHdr.backing_file_offset);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.backing_file_size = {0}", _qHdr.backing_file_size);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.cluster_bits = {0}", _qHdr.cluster_bits);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.size = {0}", _qHdr.size);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.crypt_method = {0}", _qHdr.crypt_method);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.l1_size = {0}", _qHdr.l1_size);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.l1_table_offset = {0}", _qHdr.l1_table_offset);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.refcount_table_offset = {0}", _qHdr.refcount_table_offset);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.refcount_table_clusters = {0}",
_qHdr.refcount_table_clusters);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.nb_snapshots = {0}", _qHdr.nb_snapshots);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.snapshots_offset = {0}", _qHdr.snapshots_offset);
if (_qHdr.version >= QCOW_VERSION3)
{
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.features = {0:X}", _qHdr.features);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.compat_features = {0:X}", _qHdr.compat_features);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.autoclear_features = {0:X}", _qHdr.autoclear_features);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.refcount_order = {0}", _qHdr.refcount_order);
AaruConsole.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;
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.clusterSize = {0}", _clusterSize);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.clusterSectors = {0}", _clusterSectors);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.qHdr.l1_size = {0}", _qHdr.l1_size);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.l2Size = {0}", _l2Size);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.sectors = {0}", _imageInfo.Sectors);
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 = MemoryMarshal.Cast <byte, ulong>(l1TableB).ToArray();
AaruConsole.DebugWriteLine("QCOW plugin", "Reading L1 table");
for (long i = 0; i < _l1Table.LongLength; i++)
{
_l1Table[i] = Swapping.Swap(_l1Table[i]);
}
_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;
}
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.l1Mask = {0:X}", _l1Mask);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.l1Shift = {0}", _l1Shift);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.l2Mask = {0:X}", _l2Mask);
AaruConsole.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);
}
public bool Open(IFilter imageFilter)
{
Stream stream = imageFilter.GetDataForkStream();
stream.Seek(0, SeekOrigin.Begin);
if (stream.Length < 512)
{
return(false);
}
byte[] qHdrB = new byte[48];
stream.Read(qHdrB, 0, 48);
_qHdr = Marshal.SpanToStructureBigEndian <QCowHeader>(qHdrB);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.magic = 0x{0:X8}", _qHdr.magic);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.version = {0}", _qHdr.version);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.backing_file_offset = {0}", _qHdr.backing_file_offset);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.backing_file_size = {0}", _qHdr.backing_file_size);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.mtime = {0}", _qHdr.mtime);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.size = {0}", _qHdr.size);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.cluster_bits = {0}", _qHdr.cluster_bits);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.l2_bits = {0}", _qHdr.l2_bits);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.padding = {0}", _qHdr.padding);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.crypt_method = {0}", _qHdr.crypt_method);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.l1_table_offset = {0}", _qHdr.l1_table_offset);
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.l2_bits < 9 - 3 ||
_qHdr.l2_bits > 16 - 3)
{
throw new ArgumentOutOfRangeException(nameof(_qHdr.l2_bits),
"L2 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");
}
int shift = _qHdr.cluster_bits + _qHdr.l2_bits;
if (_qHdr.size > ulong.MaxValue - (ulong)(1 << shift))
{
throw new ArgumentOutOfRangeException(nameof(_qHdr.size), "Image is too large");
}
_clusterSize = 1 << _qHdr.cluster_bits;
_clusterSectors = 1 << (_qHdr.cluster_bits - 9);
_l1Size = (uint)(((_qHdr.size + (ulong)(1 << shift)) - 1) >> shift);
_l2Size = 1 << _qHdr.l2_bits;
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.clusterSize = {0}", _clusterSize);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.clusterSectors = {0}", _clusterSectors);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.l1Size = {0}", _l1Size);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.l2Size = {0}", _l2Size);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.sectors = {0}", _imageInfo.Sectors);
byte[] l1TableB = new byte[_l1Size * 8];
stream.Seek((long)_qHdr.l1_table_offset, SeekOrigin.Begin);
stream.Read(l1TableB, 0, (int)_l1Size * 8);
_l1Table = MemoryMarshal.Cast <byte, ulong>(l1TableB).ToArray();
AaruConsole.DebugWriteLine("QCOW plugin", "Reading L1 table");
for (long i = 0; i < _l1Table.LongLength; i++)
{
_l1Table[i] = Swapping.Swap(_l1Table[i]);
}
_l1Mask = 0;
int c = 0;
_l1Shift = _qHdr.l2_bits + _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 < _qHdr.l2_bits; i++)
{
_l2Mask = (_l2Mask << 1) + 1;
}
_l2Mask <<= _qHdr.cluster_bits;
_sectorMask = 0;
for (int i = 0; i < _qHdr.cluster_bits; i++)
{
_sectorMask = (_sectorMask << 1) + 1;
}
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.l1Mask = {0:X}", _l1Mask);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.l1Shift = {0}", _l1Shift);
AaruConsole.DebugWriteLine("QCOW plugin", "qHdr.l2Mask = {0:X}", _l2Mask);
AaruConsole.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 = _qHdr.mtime > 0 ? DateHandlers.UnixUnsignedToDateTime(_qHdr.mtime)
: 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.Cylinders = (uint)(_imageInfo.Sectors / 16 / 63);
_imageInfo.Heads = 16;
_imageInfo.SectorsPerTrack = 63;
return(true);
}