/// <summary>
/// Reads the header from the file stream
/// </summary>
private void ReadHeader()
{
InputHandler fileHandler = ((InputHandler)_ioHandler);
// Determine endian
byte[] byteArray16 = new byte[2];
fileHandler.ReadPosition(byteArray16, 0x1C);
if (byteArray16[0] == 0xFE && byteArray16[1] == 0xFF)
{
fileHandler.InitBitConverter(true);
}
else
{
fileHandler.InitBitConverter(false);
}
// Check for Magic Number
if (fileHandler.ReadUInt64(0x0) != MAGIC_NUMBER)
{
throw new MagicNumberException();
}
SectorShift = fileHandler.ReadUInt16(0x1E);
MiniSectorShift = fileHandler.ReadUInt16();
NoSectorsInDirectoryChain4KB = fileHandler.ReadUInt32(0x28);
NoSectorsInFatChain = fileHandler.ReadUInt32();
DirectoryStartSector = fileHandler.ReadUInt32();
MiniSectorCutoff = fileHandler.ReadUInt32(0x38);
MiniFatStartSector = fileHandler.ReadUInt32();
NoSectorsInMiniFatChain = fileHandler.ReadUInt32();
DiFatStartSector = fileHandler.ReadUInt32();
NoSectorsInDiFatChain = fileHandler.ReadUInt32();
}
/// <summary>
/// Reads the values of the directory entry. The position of the file handler must be at the start of a directory entry.
/// </summary>
private void ReadDirectoryEntry()
{
Name = _fileHandler.ReadString(64);
// Name length check: lengthOfName = length of the element in bytes including Unicode NULL
UInt16 lengthOfName = _fileHandler.ReadUInt16();
// Commented out due to trouble with odd unicode-named streams in PowerPoint -- flgr
/*if (lengthOfName != (_name.Length + 1) * 2)
* {
* throw new InvalidValueInDirectoryEntryException("_cb");
* }*/
// Added warning - math
if (lengthOfName != (_name.Length + 1) * 2)
{
TraceLogger.Warning("Length of the name (_cb) of stream '" + Name + "' is not correct.");
}
Type = (DirectoryEntryType)_fileHandler.ReadByte();
Color = (DirectoryEntryColor)_fileHandler.ReadByte();
LeftSiblingSid = _fileHandler.ReadUInt32();
RightSiblingSid = _fileHandler.ReadUInt32();
ChildSiblingSid = _fileHandler.ReadUInt32();
byte[] array = new byte[16];
_fileHandler.Read(array);
ClsId = new Guid(array);
UserFlags = _fileHandler.ReadUInt32();
// Omit creation time
_fileHandler.ReadUInt64();
// Omit modification time
_fileHandler.ReadUInt64();
StartSector = _fileHandler.ReadUInt32();
UInt32 sizeLow = _fileHandler.ReadUInt32();
UInt32 sizeHigh = _fileHandler.ReadUInt32();
if (_header.SectorSize == 512 && sizeHigh != 0x0)
{
// Must be zero according to the specification. However, this requirement can be ommited.
TraceLogger.Warning("ul_SizeHigh of stream '" + Name + "' should be zero as sector size is 512.");
sizeHigh = 0x0;
}
SizeOfStream = ((UInt64)sizeHigh << 32) + sizeLow;
}
