Initial commit

Unity Studio/7zip/Common/InBuffer.cs

@@ -0,0 +1,72 @@
+// InBuffer.cs
+
+namespace SevenZip.Buffer
+{
+	public class InBuffer
+	{
+		byte[] m_Buffer;
+		uint m_Pos;
+		uint m_Limit;
+		uint m_BufferSize;
+		System.IO.Stream m_Stream;
+		bool m_StreamWasExhausted;
+		ulong m_ProcessedSize;
+
+		public InBuffer(uint bufferSize)
+		{
+			m_Buffer = new byte[bufferSize];
+			m_BufferSize = bufferSize;
+		}
+
+		public void Init(System.IO.Stream stream)
+		{
+			m_Stream = stream;
+			m_ProcessedSize = 0;
+			m_Limit = 0;
+			m_Pos = 0;
+			m_StreamWasExhausted = false;
+		}
+
+		public bool ReadBlock()
+		{
+			if (m_StreamWasExhausted)
+				return false;
+			m_ProcessedSize += m_Pos;
+			int aNumProcessedBytes = m_Stream.Read(m_Buffer, 0, (int)m_BufferSize);
+			m_Pos = 0;
+			m_Limit = (uint)aNumProcessedBytes;
+			m_StreamWasExhausted = (aNumProcessedBytes == 0);
+			return (!m_StreamWasExhausted);
+		}
+
+
+		public void ReleaseStream()
+		{
+			// m_Stream.Close(); 
+			m_Stream = null;
+		}
+
+		public bool ReadByte(byte b) // check it
+		{
+			if (m_Pos >= m_Limit)
+				if (!ReadBlock())
+					return false;
+			b = m_Buffer[m_Pos++];
+			return true;
+		}
+
+		public byte ReadByte()
+		{
+			// return (byte)m_Stream.ReadByte();
+			if (m_Pos >= m_Limit)
+				if (!ReadBlock())
+					return 0xFF;
+			return m_Buffer[m_Pos++];
+		}
+
+		public ulong GetProcessedSize()
+		{
+			return m_ProcessedSize + m_Pos;
+		}
+	}
+}