public bool?VerifyMediaImage()
{
// This will traverse all blocks and check their CRC64 without uncompressing them
DicConsole.DebugWriteLine("DiscImageChef format plugin", "Checking index integrity at {0}",
header.indexOffset);
imageStream.Position = (long)header.indexOffset;
IndexHeader idxHeader = new IndexHeader();
structureBytes = new byte[Marshal.SizeOf(idxHeader)];
imageStream.Read(structureBytes, 0, structureBytes.Length);
structurePointer = Marshal.AllocHGlobal(Marshal.SizeOf(idxHeader));
Marshal.Copy(structureBytes, 0, structurePointer, Marshal.SizeOf(idxHeader));
idxHeader = (IndexHeader)Marshal.PtrToStructure(structurePointer, typeof(IndexHeader));
Marshal.FreeHGlobal(structurePointer);
if (idxHeader.identifier != BlockType.Index)
{
DicConsole.DebugWriteLine("DiscImageChef format plugin", "Incorrect index identifier");
return(false);
}
DicConsole.DebugWriteLine("DiscImageChef format plugin", "Index at {0} contains {1} entries",
header.indexOffset, idxHeader.entries);
structureBytes = new byte[Marshal.SizeOf(typeof(IndexEntry)) * idxHeader.entries];
imageStream.Read(structureBytes, 0, structureBytes.Length);
Crc64Context.Data(structureBytes, out byte[] verifyCrc);
if (BitConverter.ToUInt64(verifyCrc, 0) != idxHeader.crc64)
{
DicConsole.DebugWriteLine("DiscImageChef format plugin", "Expected index CRC {0:X16} but got {1:X16}",
idxHeader.crc64, BitConverter.ToUInt64(verifyCrc, 0));
return(false);
}
imageStream.Position -= structureBytes.Length;
List <IndexEntry> vrIndex = new List <IndexEntry>();
for (ushort i = 0; i < idxHeader.entries; i++)
{
IndexEntry entry = new IndexEntry();
structureBytes = new byte[Marshal.SizeOf(entry)];
imageStream.Read(structureBytes, 0, structureBytes.Length);
structurePointer = Marshal.AllocHGlobal(Marshal.SizeOf(entry));
Marshal.Copy(structureBytes, 0, structurePointer, Marshal.SizeOf(entry));
entry = (IndexEntry)Marshal.PtrToStructure(structurePointer, typeof(IndexEntry));
Marshal.FreeHGlobal(structurePointer);
DicConsole.DebugWriteLine("DiscImageChef format plugin",
"Block type {0} with data type {1} is indexed to be at {2}", entry.blockType,
entry.dataType, entry.offset);
vrIndex.Add(entry);
}
// Read up to 1MiB at a time for verification
const int VERIFY_SIZE = 1024 * 1024;
foreach (IndexEntry entry in vrIndex)
{
imageStream.Position = (long)entry.offset;
Crc64Context crcVerify;
ulong readBytes;
byte[] verifyBytes;
switch (entry.blockType)
{
case BlockType.DataBlock:
BlockHeader blockHeader = new BlockHeader();
structureBytes = new byte[Marshal.SizeOf(blockHeader)];
imageStream.Read(structureBytes, 0, structureBytes.Length);
structurePointer = Marshal.AllocHGlobal(Marshal.SizeOf(blockHeader));
Marshal.Copy(structureBytes, 0, structurePointer, Marshal.SizeOf(blockHeader));
blockHeader = (BlockHeader)Marshal.PtrToStructure(structurePointer, typeof(BlockHeader));
Marshal.FreeHGlobal(structurePointer);
crcVerify = new Crc64Context();
readBytes = 0;
DicConsole.DebugWriteLine("DiscImageChef format plugin",
"Verifying data block type {0} at position {1}", entry.dataType,
entry.offset);
while (readBytes + VERIFY_SIZE < blockHeader.cmpLength)
{
verifyBytes = new byte[VERIFY_SIZE];
imageStream.Read(verifyBytes, 0, verifyBytes.Length);
crcVerify.Update(verifyBytes);
readBytes += (ulong)verifyBytes.LongLength;
}
verifyBytes = new byte[blockHeader.cmpLength - readBytes];
imageStream.Read(verifyBytes, 0, verifyBytes.Length);
crcVerify.Update(verifyBytes);
verifyCrc = crcVerify.Final();
if (BitConverter.ToUInt64(verifyCrc, 0) != blockHeader.cmpCrc64)
{
DicConsole.DebugWriteLine("DiscImageChef format plugin",
"Expected block CRC {0:X16} but got {1:X16}",
blockHeader.cmpCrc64, BitConverter.ToUInt64(verifyCrc, 0));
return(false);
}
break;
case BlockType.DeDuplicationTable:
DdtHeader ddtHeader = new DdtHeader();
structureBytes = new byte[Marshal.SizeOf(ddtHeader)];
imageStream.Read(structureBytes, 0, structureBytes.Length);
structurePointer = Marshal.AllocHGlobal(Marshal.SizeOf(ddtHeader));
Marshal.Copy(structureBytes, 0, structurePointer, Marshal.SizeOf(ddtHeader));
ddtHeader = (DdtHeader)Marshal.PtrToStructure(structurePointer, typeof(DdtHeader));
Marshal.FreeHGlobal(structurePointer);
crcVerify = new Crc64Context();
readBytes = 0;
DicConsole.DebugWriteLine("DiscImageChef format plugin",
"Verifying deduplication table type {0} at position {1}",
entry.dataType, entry.offset);
while (readBytes + VERIFY_SIZE < ddtHeader.cmpLength)
{
verifyBytes = new byte[readBytes];
imageStream.Read(verifyBytes, 0, verifyBytes.Length);
crcVerify.Update(verifyBytes);
readBytes += (ulong)verifyBytes.LongLength;
}
verifyBytes = new byte[ddtHeader.cmpLength - readBytes];
imageStream.Read(verifyBytes, 0, verifyBytes.Length);
crcVerify.Update(verifyBytes);
verifyCrc = crcVerify.Final();
if (BitConverter.ToUInt64(verifyCrc, 0) != ddtHeader.cmpCrc64)
{
DicConsole.DebugWriteLine("DiscImageChef format plugin",
"Expected DDT CRC {0:X16} but got {1:X16}", ddtHeader.cmpCrc64,
BitConverter.ToUInt64(verifyCrc, 0));
return(false);
}
break;
case BlockType.TracksBlock:
TracksHeader trkHeader = new TracksHeader();
structureBytes = new byte[Marshal.SizeOf(trkHeader)];
imageStream.Read(structureBytes, 0, structureBytes.Length);
structurePointer = Marshal.AllocHGlobal(Marshal.SizeOf(trkHeader));
Marshal.Copy(structureBytes, 0, structurePointer, Marshal.SizeOf(trkHeader));
trkHeader = (TracksHeader)Marshal.PtrToStructure(structurePointer, typeof(TracksHeader));
Marshal.FreeHGlobal(structurePointer);
DicConsole.DebugWriteLine("DiscImageChef format plugin",
"Track block at {0} contains {1} entries", header.indexOffset,
trkHeader.entries);
structureBytes = new byte[Marshal.SizeOf(typeof(TrackEntry)) * trkHeader.entries];
imageStream.Read(structureBytes, 0, structureBytes.Length);
Crc64Context.Data(structureBytes, out verifyCrc);
if (BitConverter.ToUInt64(verifyCrc, 0) != trkHeader.crc64)
{
DicConsole.DebugWriteLine("DiscImageChef format plugin",
"Expected index CRC {0:X16} but got {1:X16}", trkHeader.crc64,
BitConverter.ToUInt64(verifyCrc, 0));
return(false);
}
break;
default:
DicConsole.DebugWriteLine("DiscImageChef format plugin", "Ignored field type {0}",
entry.blockType);
break;
}
}
return(true);
}
public bool?VerifyMediaImage()
{
// This will traverse all blocks and check their CRC64 without uncompressing them
AaruConsole.DebugWriteLine("Aaru Format plugin", "Checking index integrity at {0}", _header.indexOffset);
_imageStream.Position = (long)_header.indexOffset;
_structureBytes = new byte[Marshal.SizeOf <IndexHeader>()];
_imageStream.Read(_structureBytes, 0, _structureBytes.Length);
IndexHeader idxHeader = Marshal.SpanToStructureLittleEndian <IndexHeader>(_structureBytes);
if (idxHeader.identifier != BlockType.Index)
{
AaruConsole.DebugWriteLine("Aaru Format plugin", "Incorrect index identifier");
return(false);
}
AaruConsole.DebugWriteLine("Aaru Format plugin", "Index at {0} contains {1} entries", _header.indexOffset,
idxHeader.entries);
_structureBytes = new byte[Marshal.SizeOf <IndexEntry>() * idxHeader.entries];
_imageStream.Read(_structureBytes, 0, _structureBytes.Length);
Crc64Context.Data(_structureBytes, out byte[] verifyCrc);
if (BitConverter.ToUInt64(verifyCrc, 0) != idxHeader.crc64)
{
AaruConsole.DebugWriteLine("Aaru Format plugin", "Expected index CRC {0:X16} but got {1:X16}",
idxHeader.crc64, BitConverter.ToUInt64(verifyCrc, 0));
return(false);
}
_imageStream.Position -= _structureBytes.Length;
List <IndexEntry> vrIndex = new List <IndexEntry>();
for (ushort i = 0; i < idxHeader.entries; i++)
{
_structureBytes = new byte[Marshal.SizeOf <IndexEntry>()];
_imageStream.Read(_structureBytes, 0, _structureBytes.Length);
IndexEntry entry = Marshal.SpanToStructureLittleEndian <IndexEntry>(_structureBytes);
AaruConsole.DebugWriteLine("Aaru Format plugin",
"Block type {0} with data type {1} is indexed to be at {2}", entry.blockType,
entry.dataType, entry.offset);
vrIndex.Add(entry);
}
// Read up to 1MiB at a time for verification
const int verifySize = 1024 * 1024;
foreach (IndexEntry entry in vrIndex)
{
_imageStream.Position = (long)entry.offset;
Crc64Context crcVerify;
ulong readBytes;
byte[] verifyBytes;
switch (entry.blockType)
{
case BlockType.DataBlock:
_structureBytes = new byte[Marshal.SizeOf <BlockHeader>()];
_imageStream.Read(_structureBytes, 0, _structureBytes.Length);
BlockHeader blockHeader = Marshal.SpanToStructureLittleEndian <BlockHeader>(_structureBytes);
crcVerify = new Crc64Context();
readBytes = 0;
AaruConsole.DebugWriteLine("Aaru Format plugin",
"Verifying data block type {0} at position {1}", entry.dataType,
entry.offset);
while (readBytes + verifySize < blockHeader.cmpLength)
{
verifyBytes = new byte[verifySize];
_imageStream.Read(verifyBytes, 0, verifyBytes.Length);
crcVerify.Update(verifyBytes);
readBytes += (ulong)verifyBytes.LongLength;
}
verifyBytes = new byte[blockHeader.cmpLength - readBytes];
_imageStream.Read(verifyBytes, 0, verifyBytes.Length);
crcVerify.Update(verifyBytes);
verifyCrc = crcVerify.Final();
if (BitConverter.ToUInt64(verifyCrc, 0) != blockHeader.cmpCrc64)
{
AaruConsole.DebugWriteLine("Aaru Format plugin",
"Expected block CRC {0:X16} but got {1:X16}",
blockHeader.cmpCrc64, BitConverter.ToUInt64(verifyCrc, 0));
return(false);
}
break;
case BlockType.DeDuplicationTable:
_structureBytes = new byte[Marshal.SizeOf <DdtHeader>()];
_imageStream.Read(_structureBytes, 0, _structureBytes.Length);
DdtHeader ddtHeader = Marshal.SpanToStructureLittleEndian <DdtHeader>(_structureBytes);
crcVerify = new Crc64Context();
readBytes = 0;
AaruConsole.DebugWriteLine("Aaru Format plugin",
"Verifying deduplication table type {0} at position {1}",
entry.dataType, entry.offset);
while (readBytes + verifySize < ddtHeader.cmpLength)
{
verifyBytes = new byte[readBytes];
_imageStream.Read(verifyBytes, 0, verifyBytes.Length);
crcVerify.Update(verifyBytes);
readBytes += (ulong)verifyBytes.LongLength;
}
verifyBytes = new byte[ddtHeader.cmpLength - readBytes];
_imageStream.Read(verifyBytes, 0, verifyBytes.Length);
crcVerify.Update(verifyBytes);
verifyCrc = crcVerify.Final();
if (BitConverter.ToUInt64(verifyCrc, 0) != ddtHeader.cmpCrc64)
{
AaruConsole.DebugWriteLine("Aaru Format plugin", "Expected DDT CRC {0:X16} but got {1:X16}",
ddtHeader.cmpCrc64, BitConverter.ToUInt64(verifyCrc, 0));
return(false);
}
break;
case BlockType.TracksBlock:
_structureBytes = new byte[Marshal.SizeOf <TracksHeader>()];
_imageStream.Read(_structureBytes, 0, _structureBytes.Length);
TracksHeader trkHeader = Marshal.SpanToStructureLittleEndian <TracksHeader>(_structureBytes);
AaruConsole.DebugWriteLine("Aaru Format plugin", "Track block at {0} contains {1} entries",
_header.indexOffset, trkHeader.entries);
_structureBytes = new byte[Marshal.SizeOf <TrackEntry>() * trkHeader.entries];
_imageStream.Read(_structureBytes, 0, _structureBytes.Length);
Crc64Context.Data(_structureBytes, out verifyCrc);
if (BitConverter.ToUInt64(verifyCrc, 0) != trkHeader.crc64)
{
AaruConsole.DebugWriteLine("Aaru Format plugin",
"Expected index CRC {0:X16} but got {1:X16}", trkHeader.crc64,
BitConverter.ToUInt64(verifyCrc, 0));
return(false);
}
break;
default:
AaruConsole.DebugWriteLine("Aaru Format plugin", "Ignored field type {0}", entry.blockType);
break;
}
}
return(true);
}
