public IEnumerable<PartitionedFileStream> GetStreams()
{
_fileStream.Seek(0, SeekOrigin.Begin);
var header = new PartitionedFileHeader(0);
header.Read(_fileStream);
var currentIndex = PartitionedFileHeader.DataOffset;
var dataStart = currentIndex;
var allOffsets = new List<long>();
while (currentIndex + sizeof(long) < dataStart + header.LengthOfCurrentBuffer)
{
var partitionedFileStreamOffset = Serializer.DeserializeLong(_fileStream);
allOffsets.Add(partitionedFileStreamOffset);
}
var allStreams = new List<PartitionedFileStream>();
foreach (var offset in allOffsets)
{
header = new PartitionedFileHeader(offset);
_fileStream.Seek(offset, SeekOrigin.Begin);
header.Read(_fileStream);
allStreams.Add(new PartitionedFileStream(_fileStream, header, AddNewHeaderSection));
}
return allStreams;
}
private void MoveToPreviousHeader()
{
if (_header.OffsetOfPrevHeader == null)
throw new InvalidOperationException("Already at the beginning of the Stream");
var oldPosition = _fileStream.Position;
_fileStream.Seek(_header.OffsetOfPrevHeader.Value, SeekOrigin.Begin);
_header = new PartitionedFileHeader(_header.OffsetOfPrevHeader.Value);
_header.Read(_fileStream);
_fileStream.Seek(oldPosition, SeekOrigin.Begin);
}
private void MoveToNextHeader()
{
var oldPosition = _fileStream.Position;
if (_header.OffsetOfNextHeader == null)
{
var nextHeader = _getNewHeader();
_header.OffsetOfNextHeader = nextHeader.OffsetOfHeader;
_fileStream.Seek(_header.OffsetOfHeader, SeekOrigin.Begin);
_header.Write(_fileStream);
nextHeader.OffsetOfPrevHeader = _header.OffsetOfHeader;
_fileStream.Seek(nextHeader.OffsetOfHeader, SeekOrigin.Begin);
nextHeader.Write(_fileStream);
_header = nextHeader;
}
else
{
_fileStream.Seek(_header.OffsetOfNextHeader.Value, SeekOrigin.Begin);
_header = new PartitionedFileHeader(_header.OffsetOfNextHeader.Value);
_header.Read(_fileStream);
}
_fileStream.Seek(oldPosition, SeekOrigin.Begin);
}
