public void AddToTail(Bytes bytes)
{
m_Count += bytes.Length;
BytesPlusCount holder = new BytesPlusCount(bytes);
m_DataQueue.Enqueue(new TRef(holder));
}
// Copy data out into a supplied buffer. If fPeek is true, it means we
// would copy out the exact same bytes if called again.
public int CopyFromHead(byte[] buffer, int offset, int length, bool fPeek)
{
int bytesCopied = 0;
while ((m_DataQueue.Count > 0) && (bytesCopied < length))
{
// Don't dequeue just yet, just peek
TRef wrapper = (TRef)m_DataQueue.Peek();
VTable.Assert(wrapper != null); // Because we checked the count
BytesPlusCount topChunk = (BytesPlusCount)(wrapper.Acquire());
int copied = topChunk.CopyOut(buffer, offset + bytesCopied,
length - bytesCopied, fPeek);
bytesCopied += copied;
if ((!fPeek) && (topChunk.Empty))
{
// We want to throw away the top chunk. To take pressure off
// the finalizer, we'll explicitly free the ExHeap data vector.
topChunk.Dispose();
m_DataQueue.Dequeue();
}
else if ((!fPeek) && (!topChunk.Empty))
{
// This should only happen because we filled up the
// caller's buffer
Debug.Assert(bytesCopied == length);
// Put the data back into its wrapper
wrapper.Release(topChunk);
}
else
{
// Release topChunk back
wrapper.Release(topChunk);
}
}
if (!fPeek)
{
m_Count -= bytesCopied;
Debug.Assert(m_Count >= 0);
}
return(bytesCopied);
}