/// <summary>
/// 写入数据，如果数据溢出，就
/// </summary>
/// <param name="buffer"></param>
/// <param name="offset"></param>
/// <param name="len"></param>
public void Write(byte[] buffer, int offset, int len)
{
Trace.Assert(len > 0 && offset + len <= buffer.Length);
this.m_nDataSize += len;
while (len > 0)
{
PieceBuffer pieceBuffer = this.m_pieces.Last.Value;
if (pieceBuffer.IsWriteOver)
{
if (this.m_abandonPiecesCache.Count > 0)
{
LinkedListNode <PieceBuffer> first = this.m_abandonPiecesCache.First;
this.m_abandonPiecesCache.RemoveFirst();
this.m_pieces.AddLast(first);
pieceBuffer = first.Value;
}
else
{
pieceBuffer = new PieceBuffer(this.m_nPieceSize);
this.m_pieces.AddLast(pieceBuffer);
}
}
int num = pieceBuffer.Write(buffer, offset, len);
offset += num;
len -= num;
}
}
/// <summary>
/// 读取数据，如果超出buffer就添加这个已经读取的数据到abandonpiecesCache里面
/// </summary>
/// <param name="buffer"></param>
/// <param name="offset"></param>
/// <param name="len"></param>
public void Read(byte[] buffer, int offset, int len)
{
Trace.Assert(len > 0 && offset + len <= buffer.Length && len <= this.m_nDataSize);
this.m_nDataSize -= len;
while (len > 0)
{
PieceBuffer value = this.m_pieces.First.Value;
if (value.IsReadOver)
{
LinkedListNode <PieceBuffer> first = this.m_pieces.First;
this.m_pieces.RemoveFirst();
if (this.m_pieces.Count + this.m_abandonPiecesCache.Count < this.m_nMinPieceNum)
{
this.m_abandonPiecesCache.AddLast(first);
}
}
else
{
int num = value.Read(buffer, offset, len);
offset += num;
len -= num;
}
}
}
