internal CompoundDocument(Stream stream, FileHeader header)
{
this.FileStorage = stream;
this.Reader = new BinaryReader(this.FileStorage);
//Abubakar : We just need to read file.
//this.Writer = new BinaryWriter(this.FileStorage, Encoding.Unicode);
//
this.Header = header;
this.SectorSize = (int)Math.Pow(2, Header.SectorSizeInPot);
this.ShortSectorSize = (int)Math.Pow(2, Header.ShortSectorSizeInPot);
this.TotalSectors = stream.Length == 0 ? 0
: (int)(stream.Length - 512) / this.SectorSize;
this.MasterSectorAllocation = new MasterSectorAllocation(this);
this.SectorAllocation = new SectorAllocation(this);
this.ShortSectorAllocation = new ShortSectorAllocation(this);
}
private static void WriteHeader(BinaryWriter writer, FileHeader header)
{
// header size is 512 bytes
writer.Write(header.FileTypeIdentifier);
writer.Write(header.FileIdentifier.ToByteArray());
writer.Write(header.RevisionNumber);
writer.Write(header.VersionNumber);
writer.Write(header.ByteOrderMark);
writer.Write(header.SectorSizeInPot);
writer.Write(header.ShortSectorSizeInPot);
writer.Write(header.UnUsed10);
writer.Write(header.NumberOfSATSectors);
writer.Write(header.FirstSectorIDofDirectoryStream);
writer.Write(header.UnUsed4);
writer.Write(header.MinimumStreamSize);
writer.Write(header.FirstSectorIDofShortSectorAllocationTable);
writer.Write(header.NumberOfShortSectors);
writer.Write(header.FirstSectorIDofMasterSectorAllocationTable);
writer.Write(header.NumberOfMasterSectors);
WriteArrayOfInt32(writer, header.MasterSectorAllocationTable);
}
private static FileHeader ReadHeader(BinaryReader reader)
{
FileHeader header = new FileHeader();
header.FileTypeIdentifier = reader.ReadBytes(8);
header.FileIdentifier = new Guid(reader.ReadBytes(16));
header.RevisionNumber = reader.ReadUInt16();
header.VersionNumber = reader.ReadUInt16();
header.ByteOrderMark = reader.ReadBytes(2);
header.SectorSizeInPot = reader.ReadUInt16();
header.ShortSectorSizeInPot = reader.ReadUInt16();
header.UnUsed10 = reader.ReadBytes(10);
header.NumberOfSATSectors = reader.ReadInt32();
header.FirstSectorIDofDirectoryStream = reader.ReadInt32();
header.UnUsed4 = reader.ReadBytes(4);
header.MinimumStreamSize = reader.ReadInt32();
header.FirstSectorIDofShortSectorAllocationTable = reader.ReadInt32();
header.NumberOfShortSectors = reader.ReadInt32();
header.FirstSectorIDofMasterSectorAllocationTable = reader.ReadInt32();
header.NumberOfMasterSectors = reader.ReadInt32();
header.MasterSectorAllocationTable = ReadArrayOfInt32(reader, 109);
return header;
}