Exemplo n.º 1
0
        public ReaderDirectory(IsoContext context, DirectoryRecord dirEntry)
            : base(context, dirEntry)
        {
            byte[] buffer = new byte[IsoUtilities.SectorSize];
            Stream extent = new ExtentStream(_context.DataStream, dirEntry.LocationOfExtent, uint.MaxValue, 0, 0);

            _records = new List <DirectoryRecord>();

            uint totalLength = dirEntry.DataLength;
            uint totalRead   = 0;

            while (totalRead < totalLength)
            {
                int  toRead    = (int)Math.Min(buffer.Length, totalLength - totalRead);
                uint bytesRead = (uint)Utilities.ReadFully(extent, buffer, 0, toRead);
                if (bytesRead != toRead)
                {
                    throw new IOException("Failed to read whole directory");
                }

                totalRead += (uint)bytesRead;

                uint pos = 0;
                while (pos < bytesRead && buffer[pos] != 0)
                {
                    DirectoryRecord dr;
                    uint            length = (uint)DirectoryRecord.ReadFrom(buffer, (int)pos, context.VolumeDescriptor.CharacterEncoding, out dr);

                    if (!IsoUtilities.IsSpecialDirectory(dr))
                    {
                        _records.Add(dr);
                    }
                    else if (dr.FileIdentifier == "\0")
                    {
                        _self = dr;
                    }

                    pos += length;
                }
            }
        }