Exemplo n.º 1
0
        private void AppendStreamData(int startSID, int streamLength, byte[] data)
        {
            int sid      = startSID;
            int next_sid = SectorAllocation.GetNextSectorID(sid);
            int index    = 0;

            while (next_sid != SID.EOC)
            {
                sid      = next_sid;
                next_sid = SectorAllocation.GetNextSectorID(sid);
                index   += SectorSize;
            }
            if (index < streamLength)
            {
                int position = streamLength - index;
                int length   = SectorSize - position;
                if (data.Length <= length)
                {
                    WriteInSector(sid, position, data, 0, data.Length);
                }
                else
                {
                    WriteInSector(sid, position, data, 0, length);
                    next_sid = AllocateDataSectorAfter(sid);
                    byte[] remained_data = new byte[data.Length - length];
                    Array.Copy(data, length, remained_data, 0, remained_data.Length);
                    WriteStreamData(next_sid, remained_data);
                }
            }
            else
            {
                next_sid = AllocateDataSectorAfter(sid);
                WriteStreamData(next_sid, data);
            }
        }
Exemplo n.º 2
0
        internal List <int> GetStreamDataAsIntegers(int StartSID)
        {
            List <int> chain = SectorAllocation.GetSIDChain(StartSID);
            List <int> data  = new List <int>();

            foreach (int sid in chain)
            {
                data.AddRange(ReadSectorDataAsIntegers(sid));
            }
            return(data);
        }
Exemplo n.º 3
0
        private byte[] GetStreamDataAsBytes(int StartSID)
        {
            List <int>  chain = SectorAllocation.GetSIDChain(StartSID);
            List <byte> data  = new List <byte>();

            foreach (int sid in chain)
            {
                data.AddRange(ReadSectorDataAsBytes(sid));
            }
            return(data.ToArray());
        }
Exemplo n.º 4
0
        internal void WriteStreamData(int startSID, byte[] data)
        {
            int prev_sid = SID.EOC;
            int sid      = startSID;
            int index    = 0;

            while (index < data.Length)
            {
                if (sid == SID.EOC)
                {
                    if (prev_sid == SID.EOC)
                    {
                        sid = this.AllocateDataSector();
                    }
                    else
                    {
                        sid = this.AllocateDataSectorAfter(prev_sid);
                    }
                }
                int offset = GetSectorOffset(sid);
                Writer.BaseStream.Position = offset;
                if (index + SectorSize < data.Length)
                {
                    Writer.Write(data, index, SectorSize);
                }
                else
                {
                    Writer.Write(data, index, data.Length - index);
                }
                index   += SectorSize;
                prev_sid = sid;
                sid      = this.SectorAllocation.GetNextSectorID(prev_sid);
            }
            if (sid != SID.EOC && prev_sid != SID.EOC)
            {
                SectorAllocation.LinkSectorID(prev_sid, SID.EOC);
                while (sid != SID.EOC)
                {
                    int next_sid = SectorAllocation.GetNextSectorID(sid);
                    SectorAllocation.LinkSectorID(sid, SID.Free);
                    sid = next_sid;
                }
            }
        }
Exemplo n.º 5
0
        internal CompoundDocument(Stream stream, FileHeader header)
        {
            this.FileStorage = stream;
            this.Reader      = new BinaryReader(this.FileStorage);
            if (stream.CanWrite)
            {
                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);
        }