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

            _records = new List <ReaderDirEntry>();

            uint totalLength = dirEntry.Record.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))
                    {
                        ReaderDirEntry childDirEntry = new ReaderDirEntry(_context, dr);

                        if (context.SuspDetected && !string.IsNullOrEmpty(context.RockRidgeIdentifier))
                        {
                            if (childDirEntry.SuspRecords == null || !childDirEntry.SuspRecords.HasEntry(context.RockRidgeIdentifier, "RE"))
                            {
                                _records.Add(childDirEntry);
                            }
                        }
                        else
                        {
                            _records.Add(childDirEntry);
                        }
                    }
                    else if (dr.FileIdentifier == "\0")
                    {
                        _self = new ReaderDirEntry(_context, dr);
                    }

                    pos += length;
                }
            }
        }