private OleObject ReadOLE(BinaryReader reader)
{
OleObject res = new OleObject();
// read chunk version
ushort version = reader.ReadUInt16();
reader.ReadUInt16();
// version can be whatever according to MS-OLEDS; thus skip
uint formatId = reader.ReadUInt32();
if (formatId < 1 || formatId > 3)
{
formatId = 0;
}
res.Format = (OleType)formatId;
// class string
uint stringLength = reader.ReadUInt32();
byte[] stringData = reader.ReadBytes((int)stringLength);
res.ClassString = CutAtNullTerminator(Encoding.ASCII.GetString(stringData));
if (formatId == 3)
{
// static
uint width = reader.ReadUInt32();
uint height = reader.ReadUInt32();
// size and data
uint staticDataLength = reader.ReadUInt32();
res.StaticData = reader.ReadBytes((int)staticDataLength);
}
else
{
// topic string
reader.BaseStream.Seek(reader.ReadUInt32(), SeekOrigin.Current);
// item string
reader.BaseStream.Seek(reader.ReadUInt32(), SeekOrigin.Current);
if (formatId == 2)
{
// embedded. native data & size
uint staticDataLength = reader.ReadUInt32();
res.StaticData = reader.ReadBytes((int)staticDataLength);
}
else
{
// linked. network name
uint networkNameLength = reader.ReadUInt32();
byte[] networkNameData = reader.ReadBytes((int)networkNameLength);
res.NetworkName = CutAtNullTerminator(Encoding.ASCII.GetString(networkNameData));
reader.BaseStream.Seek(reader.ReadUInt32(), SeekOrigin.Current);
// network type
res.NetworkType = reader.ReadUInt32();
// link options
res.LinkOption = reader.ReadUInt32();
SkipPresentationObj(reader);
}
}
return(res);
}
private bool TryParseOleAttachment(OleObject obj, ref AttachmentFile attachment)
{
if (obj.ClassString == "SoundRec")
{
attachment = new AttachmentFile("SOUND.WAV", "audio/wav", obj.StaticData);
return(true);
}
if (obj.ClassString == "PBrush")
{
attachment = new AttachmentFile("IMAGE.BMP", "image/bmp", obj.StaticData);
return(true);
}
if (obj.ClassString == "Package")
{
attachment = new AttachmentFile("PACKAGE.OLE", "application/octet-stream", obj.StaticData);
return(true);
}
return(false);
}
private void ReadDKO(Cardfile file, BinaryReader reader)
{
uint nextObjectID = reader.ReadUInt32();
ushort cardCount = reader.ReadUInt16();
long oldPosition;
for (int i = 0; i < cardCount; ++i)
{
reader.BaseStream.Seek(6, SeekOrigin.Current);
// read card info
uint pos = reader.ReadUInt32();
byte flags = reader.ReadByte();
byte[] titleRaw = reader.ReadBytes(82);
string index = ReadNullTerminated16String(titleRaw);
oldPosition = reader.BaseStream.Position;
// read card
reader.BaseStream.Seek(pos, SeekOrigin.Begin);
ushort objectFlags = reader.ReadUInt16();
AttachmentFile attachment = null;
if (objectFlags != 0)
{
// contains OLE object
uint objectId = reader.ReadUInt32();
// get length of OLE object by skipping over it
long beforeObj = reader.BaseStream.Position;
OleObject obj = ReadOLE(reader);
long oleObjLen = reader.BaseStream.Position - beforeObj;
reader.BaseStream.Seek(beforeObj, SeekOrigin.Begin);
obj.Data = reader.ReadBytes((int)oleObjLen);
bool customAttachment = false;
if (obj.Format == OleType.Static || obj.Format == OleType.Embedded)
{
customAttachment = TryParseOleAttachment(obj, ref attachment);
}
if (!customAttachment)
{
attachment = new AttachmentFile("OBJECT.OLE", "application/octet-stream", obj.Data);
}
// then skip other attributes
/*ushort charWidth =*/ reader.ReadUInt16();
/*ushort charHeight =*/ reader.ReadUInt16();
/*ushort rectLeft =*/ reader.ReadUInt16();
/*ushort rectTop =*/ reader.ReadUInt16();
/*ushort rectRight =*/ reader.ReadUInt16();
/*ushort rectBottom =*/ reader.ReadUInt16();
/*ushort objectType =*/ reader.ReadUInt16();
}
ushort textlen = reader.ReadUInt16();
byte[] textRaw = reader.ReadBytes(textlen * 2 + 3);
string text = ReadNullTerminated16String(textRaw);
reader.BaseStream.Seek(oldPosition, SeekOrigin.Begin);
Card card = new Card(index, text);
if (attachment != null)
{
card.Attachment = attachment;
}
file.AddCard(card);
}
}
