public DataBlock(byte[] buffer, bCryptMethodName bCryptMethod) : base(buffer)
{
m_bCryptMethod = bCryptMethod;
Data = new byte[BlockTrailer.cb];
Array.Copy(buffer, Data, BlockTrailer.cb);
// DataBlock's data may be decoded
Data = GetDecodedData();
}
public PSTHeader(byte[] buffer)
{
dwMagic = ByteReader.ReadAnsiString(buffer, 0, 4);
CRCPartial = LittleEndianConverter.ToUInt32(buffer, 4);
wMagicClient = ByteReader.ReadAnsiString(buffer, 8, 2);
wVer = LittleEndianConverter.ToUInt16(buffer, 10);
wVerClient = LittleEndianConverter.ToUInt16(buffer, 12);
bPlatformCreate = buffer[14];
bPlatformAccess = buffer[15];
dwReserved1 = LittleEndianConverter.ToUInt32(buffer, 16);
dwReserved2 = LittleEndianConverter.ToUInt32(buffer, 20);
// bidUnused - which is not necessarily zeroed out
bidUnused = new BlockID(buffer, 24);
bidNextP = new BlockID(buffer, 32);
dwUnique = LittleEndianConverter.ToUInt32(buffer, 40);
int position = 44;
for (int index = 0; index < 32; index++)
{
rgnid[index] = LittleEndianConverter.ToUInt32(buffer, position);
position += 4;
}
root = new RootStructure(buffer, 180);
dwAlign = LittleEndianConverter.ToUInt32(buffer, 252);
Array.Copy(buffer, 256, rgbFM, 0, 128);
Array.Copy(buffer, 384, rgbFP, 0, 128);
bSentinel = buffer[512];
bCryptMethod = (bCryptMethodName)buffer[513];
bidNextB = new BlockID(buffer, 516);
dwCRCFull = LittleEndianConverter.ToUInt32(buffer, 524);
Array.Copy(buffer, 528, rgbReserved2, 0, 3);
bReserved = buffer[531];
Array.Copy(buffer, 532, rgbReserved3, 0, 32);
uint partial = PSTCRCCalculation.ComputeCRC(buffer, 8, 471);
if (partial != CRCPartial)
{
throw new InvalidChecksumException();
}
uint full = PSTCRCCalculation.ComputeCRC(buffer, 8, 516);
if (full != dwCRCFull)
{
throw new InvalidChecksumException();
}
}
// Data tree root is either a single data block, or an XBlock / XXBlock
public DataTree(PSTFile file, Block rootBlock) : base(file)
{
m_bCryptMethod = file.Header.bCryptMethod;
m_rootBlock = rootBlock;
}
private Block m_rootBlock; // can be DataBlock, XBlock or XXBlock (or null [if we deleted the data tree])
/// <summary>
/// Create new data tree
/// </summary>
public DataTree(PSTFile file) : base(file)
{
m_bCryptMethod = file.Header.bCryptMethod;
m_rootBlock = new DataBlock(m_bCryptMethod);
AddBlock(m_rootBlock);
}
public DataBlock(bCryptMethodName bCryptMethod)
{
m_bCryptMethod = bCryptMethod;
}
public static Block ReadFromStream(Stream stream, BlockRef blockRef, int dataLength, bCryptMethodName bCryptMethod)
{
long offset = (long)blockRef.ib;
int totalLength = GetTotalBlockLength(dataLength);
stream.Seek(offset, SeekOrigin.Begin);
byte[] buffer = new byte[totalLength];
stream.Read(buffer, 0, totalLength);
BlockTrailer trailer = BlockTrailer.ReadFromEndOfBuffer(buffer);
Block block;
if (trailer.bid.Internal)
{
// XBlock or XXBlock
byte btype = buffer[0];
byte cLevel = buffer[1];
if (btype == (byte)BlockType.XBlock && cLevel == 0x01)
{
// XBLOCK
block = new XBlock(buffer);
}
else if (btype == (byte)BlockType.XXBlock && cLevel == 0x02)
{
// XXBLOCK
block = new XXBlock(buffer);
}
else if (btype == (byte)BlockType.SLBLOCK && cLevel == 0x00)
{
// SLBLock
block = new SubnodeLeafBlock(buffer);
}
else if (btype == (byte)BlockType.SIBLOCK && cLevel == 0x01)
{
// SIBLock
block = new SubnodeIntermediateBlock(buffer);
}
else
{
throw new Exception("Internal block, but not XBLOCK, XXBlock, SLBLOCK or SIBLOCK");
}
}
else
{
block = new DataBlock(buffer, bCryptMethod);
}
// See question 3 at:
// http://social.msdn.microsoft.com/Forums/en-CA/os_binaryfile/thread/923f5964-4a89-4811-86c2-06a553c34510
// However, so far all tests suggest that there should be no problem to use BlockID.Value for both arguments
if (blockRef.bid.LookupValue != block.BlockID.LookupValue)
{
throw new InvalidBlockIDException();
}
if (dataLength != trailer.cb)
{
throw new Exception("Invalid block length");
}
uint crc = PSTCRCCalculation.ComputeCRC(buffer, dataLength);
if (block.BlockTrailer.dwCRC != crc)
{
throw new InvalidChecksumException();
}
uint signature = BlockTrailer.ComputeSignature(blockRef.ib, blockRef.bid.Value);
if (block.BlockTrailer.wSig != signature)
{
throw new InvalidChecksumException();
}
return(block);
}
