release/src-rt-6.x/linux/linux-2.6/scripts/squashfs/lzma/CS/7zip/Common/InBuffer.cs

   1 // InBuffer.cs
   2
   3 namespace SevenZip.Buffer
   4 {
   5         public class InBuffer
   6         {
   7                 byte[] m_Buffer;
   8                 uint m_Pos;
   9                 uint m_Limit;
  10                 uint m_BufferSize;
  11                 System.IO.Stream m_Stream;
  12                 bool m_StreamWasExhausted;
  13                 ulong m_ProcessedSize;
  14
  15                 public InBuffer(uint bufferSize)
  16                 {
  17                         m_Buffer = new byte[bufferSize];
  18                         m_BufferSize = bufferSize;
  19                 }
  20
  21                 public void Init(System.IO.Stream stream)
  22                 {
  23                         m_Stream = stream;
  24                         m_ProcessedSize = 0;
  25                         m_Limit = 0;
  26                         m_Pos = 0;
  27                         m_StreamWasExhausted = false;
  28                 }
  29
  30                 public bool ReadBlock()
  31                 {
  32                         if (m_StreamWasExhausted)
  33                                 return false;
  34                         m_ProcessedSize += m_Pos;
  35                         int aNumProcessedBytes = m_Stream.Read(m_Buffer, 0, (int)m_BufferSize);
  36                         m_Pos = 0;
  37                         m_Limit = (uint)aNumProcessedBytes;
  38                         m_StreamWasExhausted = (aNumProcessedBytes == 0);
  39                         return (!m_StreamWasExhausted);
  40                 }
  41
  42
  43                 public void ReleaseStream()
  44                 {
  45                         // m_Stream.Close();
  46                         m_Stream = null;
  47                 }
  48
  49                 public bool ReadByte(byte b) // check it
  50                 {
  51                         if (m_Pos >= m_Limit)
  52                                 if (!ReadBlock())
  53                                         return false;
  54                         b = m_Buffer[m_Pos++];
  55                         return true;
  56                 }
  57
  58                 public byte ReadByte()
  59                 {
  60                         // return (byte)m_Stream.ReadByte();
  61                         if (m_Pos >= m_Limit)
  62                                 if (!ReadBlock())
  63                                         return 0xFF;
  64                         return m_Buffer[m_Pos++];
  65                 }
  66
  67                 public ulong GetProcessedSize()
  68                 {
  69                         return m_ProcessedSize + m_Pos;
  70                 }
  71         }
  72 }