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/* This file is part of SevenZipSharp.
SevenZipSharp is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
SevenZipSharp is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with SevenZipSharp. If not, see <http://www.gnu.org/licenses/>.
*/
using System.IO;
namespace SevenZip.Sdk.Buffer
{
/// <summary>
/// Implements the input buffer work
/// </summary>
internal class InBuffer
{
private readonly byte[] m_Buffer;
private readonly uint m_BufferSize;
private uint m_Limit;
private uint m_Pos;
private ulong m_ProcessedSize;
private Stream m_Stream;
private bool m_StreamWasExhausted;
/// <summary>
/// Initializes the input buffer
/// </summary>
/// <param name="bufferSize"></param>
private InBuffer(uint bufferSize)
{
m_Buffer = new byte[bufferSize];
m_BufferSize = bufferSize;
}
/// <summary>
/// Initializes the class
/// </summary>
/// <param name="stream"></param>
private void Init(Stream stream)
{
m_Stream = stream;
m_ProcessedSize = 0;
m_Limit = 0;
m_Pos = 0;
m_StreamWasExhausted = false;
}
/// <summary>
/// Reads the whole block
/// </summary>
/// <returns></returns>
private 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);
}
/// <summary>
/// Releases the stream
/// </summary>
private void ReleaseStream()
{
// m_Stream.Close();
m_Stream = null;
}
/// <summary>
/// Reads the byte to check it
/// </summary>
/// <param name="b"></param>
/// <returns></returns>
private bool ReadByte(out byte b)
{
b = 0;
if (m_Pos >= m_Limit)
if (!ReadBlock())
return false;
b = m_Buffer[m_Pos++];
return true;
}
/// <summary>
/// Reads the next byte
/// </summary>
/// <returns></returns>
private byte ReadByte()
{
// return (byte)m_Stream.ReadByte();
if (m_Pos >= m_Limit)
if (!ReadBlock())
return 0xFF;
return m_Buffer[m_Pos++];
}
/// <summary>
/// Gets processed size
/// </summary>
/// <returns></returns>
private ulong GetProcessedSize()
{
return m_ProcessedSize + m_Pos;
}
}
}
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