/// <summary>
/// Writes the specified array.
/// </summary>
/// <param name="array">The array.</param>
/// <param name="offset">The offset.</param>
/// <param name="count">The count.</param>
public override void Write(byte[] array, int offset, int count)
{
int startSegmentIndex = SegmentUtility.GetSegmentIndex(_position, _segmentSize);
int endSegmentIndex = SegmentUtility.GetSegmentIndex(_position + count, _segmentSize);
int bytesWritten = 0;
// loop through segments
for (int segmentIndex = startSegmentIndex; segmentIndex <= endSegmentIndex; segmentIndex++)
{
// create the segment key
string segmentKey = SegmentUtility.GenerateSegmentKey(segmentIndex, _regionKey.Key);
// with the segment position we know where to start writing in the current segment
var segmentPosition = SegmentUtility.GetPositionInSegment(bytesWritten + _position, _segmentSize);
// calculate the byte count
var byteCount = _segmentSize - segmentPosition;
if (count - bytesWritten < byteCount)
byteCount = count - bytesWritten;
// if we have bytes to write, write the bytes
if (byteCount > 0)
{
// fetch or create the segment in the cache
var segment = _cache.Get<byte[]>(segmentKey, () => new byte[_segmentSize], _regionKey.Region);
System.Array.Copy(array, offset + bytesWritten, segment, segmentPosition, byteCount);
bytesWritten += byteCount;
_cache.Set(segmentKey, segment, _regionKey.Region);
}
}
_position += count;
var header = this.Header;
if (_position > header.Length)
{
header.Length = _position;
this.Header = header;
}
}
/// <summary>
/// When overridden in a derived class, sets the position within the current stream.
/// </summary>
/// <param name="offset">A byte offset relative to the <paramref name="origin" /> parameter.</param>
/// <param name="origin">A value of type <see cref="T:System.IO.SeekOrigin" /> indicating the reference point used to obtain the new position.</param>
/// <returns>
/// The new position within the current stream.
/// </returns>
public override long Seek(long offset, SeekOrigin origin)
{
var length = Header.Length;
var position = offset;
if (origin == SeekOrigin.End)
position = length - offset;
if (origin == SeekOrigin.Current)
position = _position + offset;
_position = position;
var header = this.Header;
// adjust the header length
if (header.Length < position)
{
header.Length = position;
this.Header = header;
}
return position;
}
