示例#1
0
        internal static void ValidateHeader(CFHeader header)
        {
            if (header.Signature != CFHeader.DefaultSignature)
                throw new CompoundFileException("Invalid header: signature");
            if(header.CLSID != Guid.Empty)
                throw new CompoundFileException("Invalid header: CLSID");
            if(header.MinorVersion != 0x3E)
                throw new CompoundFileException("Invalid header: Minor version");
            if (header.MajorVersion != 3 && header.MajorVersion != 4)
                throw new CompoundFileException("Invalid header: Major version");
            if(header.ByteOrder != 0xFFFE)
                throw new CompoundFileException("Invalid header: Byte order");
            if(header.MajorVersion == 3 && header.SectorShift != 0x0009)
                throw new CompoundFileException("Invalid header: Sector shirt for v3");
            if (header.MajorVersion == 4 && header.SectorShift != 0x000c)
                throw new CompoundFileException("Invalid header: Sector shirt for v4");
            if(header.MiniSectorShift != 0x0006)
                throw new CompoundFileException("Invalid header: Mini sector shirt");
            if(header.Reserved[0] != 0 || header.Reserved[1] != 0 ||
                header.Reserved[2] != 0 || header.Reserved[3] != 0 ||
                header.Reserved[4] != 0 || header.Reserved[5] != 0)
                throw new CompoundFileException("Invalid header: Reserved");
            if(header.MajorVersion == 3 && header.DirectorySectorsCount != 0)
                throw new CompoundFileException("Invalid header: Directory sectors for v3");

            // TODO numbers and first sector

            if(header.MiniStreamCutoffSize != 0x1000)
                throw new CompoundFileException("Invalid header: Mini stream cutoff size");

            // TODO mini numbers and first sector

            // TODO mini DIFAT and number DIFAT
        }
 private void Initialize()
 {
     header = ReaderUtils.ReadHeader(BaseStream);
     ReaderUtils.ValidateHeader(header);
 }
示例#3
0
        internal static CFHeader ReadHeader(Stream s)
        {
            s.Position = 0;
            byte[] headerBytes = new byte[HeaderSize];
            int headerRead = s.Read(headerBytes, 0, HeaderSize);
            if (headerRead != HeaderSize)
            {
                throw new CompoundFileException("Invalid header: eof of file");
            }

            CFHeader header = new CFHeader();
            header.Signature = BitConverter.ToUInt64(headerBytes, 0);
            header.CLSID = new Guid(GetByteArrayPortion(headerBytes, 8, 16));
            header.MinorVersion = BitConverter.ToUInt16(headerBytes, 24);
            header.MajorVersion = BitConverter.ToUInt16(headerBytes, 26);
            header.ByteOrder = BitConverter.ToUInt16(headerBytes, 28);
            header.SectorShift = BitConverter.ToUInt16(headerBytes, 30);
            header.MiniSectorShift = BitConverter.ToUInt16(headerBytes, 32);
            header.Reserved = GetByteArrayPortion(headerBytes, 34, 6);
            header.DirectorySectorsCount = BitConverter.ToUInt32(headerBytes, 40);
            header.FATSectorsCount = BitConverter.ToUInt32(headerBytes, 44);
            header.FirstDirectorySectorLocation = BitConverter.ToUInt32(headerBytes, 48);
            header.TransactionSignatureNumber = BitConverter.ToUInt32(headerBytes, 52);
            header.MiniStreamCutoffSize = BitConverter.ToUInt32(headerBytes, 56);
            header.FirstMiniFATSectorLocation = BitConverter.ToUInt32(headerBytes, 60);
            header.MiniFATSectorsCount = BitConverter.ToUInt32(headerBytes, 64);
            header.FirstDIFATSectorLocation = BitConverter.ToUInt32(headerBytes, 68);
            header.DIFATSectorsCount = BitConverter.ToUInt32(headerBytes, 72);

            header.DIFAT = new uint[HeaderDIFATSectorsCount];
            for (int i = 0; i < HeaderDIFATSectorsCount; i++)
            {
                header.DIFAT[i] = BitConverter.ToUInt32(headerBytes, 76 + i * 4);
            }

            // skip checking zeros after the header data

            return header;
        }