Mercurial > vba-linux

     1 // LzOutWindow.h

     2 

     3 #ifndef __LZ_OUT_WINDOW_H

     4 #define __LZ_OUT_WINDOW_H

     5 

     6 #include "../IStream.h"

     7 

     8 #include "../Common/OutBuffer.h"

     9 

    10 #ifndef _NO_EXCEPTIONS

    11 typedef COutBufferException CLzOutWindowException;

    12 #endif

    13 

    14 class CLzOutWindow: public COutBuffer

    15 {

    16 public:

    17   void Init(bool solid = false);

    18   

    19   // distance >= 0, len > 0,

    20   bool CopyBlock(UInt32 distance, UInt32 len)

    21   {

    22     UInt32 pos = _pos - distance - 1;

    23     if (distance >= _pos)

    24     {

    25       if (!_overDict || distance >= _bufferSize)

    26         return false;

    27       pos += _bufferSize;

    28     }

    29     if (_limitPos - _pos > len && _bufferSize - pos > len)

    30     {

    31       const Byte *src = _buffer + pos;

    32       Byte *dest = _buffer + _pos;

    33       _pos += len;

    34       do

    35         *dest++ = *src++;

    36       while(--len != 0);

    37     }

    38     else do

    39     {

    40       if (pos == _bufferSize)

    41         pos = 0;

    42       _buffer[_pos++] = _buffer[pos++];

    43       if (_pos == _limitPos)

    44         FlushWithCheck();

    45     }

    46     while(--len != 0);

    47     return true;

    48   }

    49   

    50   void PutByte(Byte b)

    51   {

    52     _buffer[_pos++] = b;

    53     if (_pos == _limitPos)

    54       FlushWithCheck();

    55   }

    56   

    57   Byte GetByte(UInt32 distance) const

    58   {

    59     UInt32 pos = _pos - distance - 1;

    60     if (pos >= _bufferSize)

    61       pos += _bufferSize;

    62     return _buffer[pos];

    63   }

    64 };

    65 

    66 #endif
author	Robert McIntyre <rlm@mit.edu>
date	Sat, 03 Mar 2012 10:31:27 -0600
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