// OutBuffer.cs
using Windows.Storage.Streams;
using System.IO;

namespace WinRT.BxlComponent.SevenZip.Buffer
{
	public sealed class OutBuffer
	{
		byte[] m_Buffer;
		uint m_Pos;
		uint m_BufferSize;
		System.IO.Stream m_Stream;
		ulong m_ProcessedSize;

		public OutBuffer(uint bufferSize)
		{
			m_Buffer = new byte[bufferSize];
			m_BufferSize = bufferSize;
		}

        //public void SetStream(System.IO.Stream stream) { m_Stream = stream; }
        public void SetStream(IRandomAccessStream stream) { m_Stream = stream.AsStream(); }
        public void FlushStream() { m_Stream.Flush(); }
		public void CloseStream() { m_Stream.Dispose(); }
		public void ReleaseStream() { m_Stream = null; }

		public void Init()
		{
			m_ProcessedSize = 0;
			m_Pos = 0;
		}

		public void WriteByte(byte b)
		{
			m_Buffer[m_Pos++] = b;
			if (m_Pos >= m_BufferSize)
				FlushData();
		}

		public void FlushData()
		{
			if (m_Pos == 0)
				return;
			m_Stream.Write(m_Buffer, 0, (int)m_Pos);
			m_Pos = 0;
		}

		public ulong GetProcessedSize() { return m_ProcessedSize + m_Pos; }
	}
}
