System.Net.BufferedReadStream.Push C# (CSharp) Метод

        internal void Push(byte[] buffer, int offset, int count)
        {
            if (count == 0)
                return;

            if (_storedOffset == _storedLength)
            {
                if (_storedBuffer == null || _storedBuffer.Length < count)
                {
                    _storedBuffer = new byte[count];
                }
                _storedOffset = 0;
                _storedLength = count;
            }
            else
            {
                // if there's room to just insert before existing data
                if (count <= _storedOffset)
                {
                    _storedOffset -= count;
                }
                // if there's room in the buffer but need to shift things over
                else if (count <= _storedBuffer.Length - _storedLength + _storedOffset)
                {
                    Buffer.BlockCopy(_storedBuffer, _storedOffset, _storedBuffer, count, _storedLength - _storedOffset);
                    _storedLength += count - _storedOffset;
                    _storedOffset = 0;
                }
                else
                {
                    byte[] newBuffer = new byte[count + _storedLength - _storedOffset];
                    Buffer.BlockCopy(_storedBuffer, _storedOffset, newBuffer, count, _storedLength - _storedOffset);
                    _storedLength += count - _storedOffset;
                    _storedOffset = 0;
                    _storedBuffer = newBuffer;
                }
            }

            Buffer.BlockCopy(buffer, offset, _storedBuffer, _storedOffset, count);
        }