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// 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;
}
}
}
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