internal short GetDOPFlag(DOPHeader dopHeader, int nOffset)
{
short bFlags = 0;
int sizeFlags = Marshal.SizeOf(bFlags);
IntPtr pFlags = Marshal.AllocHGlobal(sizeFlags);
try
{
int iOffset = dopHeader.fcDop + nOffset;
Marshal.Copy(m_btContents, iOffset, pFlags, sizeFlags);
bFlags = (short) Marshal.PtrToStructure(pFlags, typeof(short));
}
finally
{
Marshal.FreeHGlobal(pFlags);
}
return bFlags;
}
private bool InitialiserMethodForWordFileOnDisk()
{
StructuredStorageInterface.IStorage iStorage;
IStream iStream = GetStream(out iStorage, "WordDocument");
if (null == iStream)
return false;
StreamWrapper stream;
FIB fib;
DOPHeader dopHeader;
using (new ComObjectGovernor(iStream))
using (new ComObjectGovernor(iStorage))
{
stream = new StreamWrapper(iStream);
fib = new FIB();
dopHeader = new DOPHeader();
stream.GetDOP(ref dopHeader);
object fibObject = fib as object;
stream.GetHeaderStructure(ref fibObject);
fib = (FIB)fibObject;
}
// \ /
// .\-/.
// /\ () () /\
// / \ /~-~\ / \
// y Y V
// ,-^-./ | \,-^-.
/// { | } \
// \ | /
// /\ A /\
// / \/ \/ \
// / \
//
// int numLols = 1 // increment every time you see this for the first time
if (fib.magicNumber != 0) //THIS ZERO-CHECK IS A HACK FOR PROTECT MOBILE - IT SHOULD BE REMOVED ASAP
{
//THIS is the proper code to check for Word file versioning. This should stay.
if (fib.magicNumber != 0xA5DC && fib.magicNumber != 0xA5EC)
return false;
}
//we will get this far with a docx/docm if it is encrypted but the FIB is empty then so we can drop out now
if (fib.bitData == 0 && fib.lid == 0 && fib.magicNumber == 0 && fib.version == 0 && fib.nProduct == 0)
{
return false;
}
m_fileData.FileType = FileType.WordDocument;
if ((fib.bitData & StreamWrapper.fEncrypted) == StreamWrapper.fEncrypted)
m_fileData.ReadPasswordProtected = true;
if ((fib.bitData & StreamWrapper.fWriteReservation) == StreamWrapper.fWriteReservation)
m_fileData.WritePasswordProtected = true;
// only try to find the document protection flags within the DOP if we know that the
// file is not encrypted. Otherwise the offsets are not valid.
if (!m_fileData.ReadPasswordProtected && !m_fileData.WritePasswordProtected)
{
//DOPHeader dopHeader = new DOPHeader();
//stream.GetDOP(ref dopHeader);
m_fileData.DocumentProtected = HasDocumentProtection(fib, dopHeader);
}
m_impl = new FileImpl(m_fileData);
return true;
//}
}
internal void GetDOP(ref DOPHeader dopHeader)
{
int sizeDOPHeader = Marshal.SizeOf(dopHeader);
IntPtr pDOPInfo = Marshal.AllocHGlobal(sizeDOPHeader);
Marshal.Copy(m_btContents, 0x0192, pDOPInfo, sizeDOPHeader);
dopHeader = (DOPHeader)Marshal.PtrToStructure(pDOPInfo, typeof(DOPHeader));
Marshal.FreeHGlobal(pDOPInfo);
Logger.LogInfo("DOP offset: " + dopHeader.fcDop.ToString() + " DOP size: " + dopHeader.lcbDop.ToString());
}
private bool HasDocumentProtection(FIB fib, DOPHeader dopHeader)
{
StructuredStorageInterface.IStorage iStorageDOP;
IStream iStreamDOP;
// read the fWhichTblStm bit
if ((fib.bitData & 0x0200) == 0x0200)
{
iStreamDOP = GetStream(out iStorageDOP, "1Table");
}
else
{
iStreamDOP = GetStream(out iStorageDOP, "0Table");
}
if (iStreamDOP != null)
{
using (new ComObjectGovernor(iStreamDOP))
using (new ComObjectGovernor(iStorageDOP))
{
StreamWrapper streamDOP = new StreamWrapper(iStreamDOP);
short bFlags = streamDOP.GetDOPFlag(dopHeader, 0x0006);
bool bLockAtn = (bFlags & 0x0010) == 0x0010; // annotations locked for editing
bool bProtEnabled = (bFlags & 0x0200) == 0x0200; // document protected for edit operations
bool bLockRev = (bFlags & 0x4000) == 0x4000; // revision marking state locked
if (bLockAtn || bLockRev || bProtEnabled)
{
return true;
}
if (fib.version >= 217) // Word 2000 or later
{
short bDocumentProtection = streamDOP.GetDOPFlag(dopHeader, 0x0254);
bool bEnforceProtection = (bDocumentProtection & 0x0008) == 0x0008;
return bEnforceProtection;
}
}
}
return false;
}
