4.44 beta

CPP/7zip/Compress/LZ/LZOutWindow.h

@@ -0,0 +1,56 @@
+// LZOutWindow.h
+
+#ifndef __LZ_OUT_WINDOW_H
+#define __LZ_OUT_WINDOW_H
+
+#include "../../IStream.h"
+#include "../../Common/OutBuffer.h"
+
+#ifndef _NO_EXCEPTIONS
+typedef COutBufferException CLZOutWindowException;
+#endif
+
+class CLZOutWindow: public COutBuffer
+{
+public:
+  void Init(bool solid = false);
+  
+  // distance >= 0, len > 0, 
+  bool CopyBlock(UInt32 distance, UInt32 len)
+  {
+    UInt32 pos = _pos - distance - 1;
+    if (distance >= _pos)
+    {
+      if (!_overDict || distance >= _bufferSize)
+        return false;
+      pos += _bufferSize;
+    }
+    do
+    {
+      if (pos == _bufferSize)
+        pos = 0;
+      _buffer[_pos++] = _buffer[pos++];
+      if (_pos == _limitPos)
+        FlushWithCheck();  
+    }
+    while(--len != 0);
+    return true;
+  }
+  
+  void PutByte(Byte b)
+  {
+    _buffer[_pos++] = b;
+    if (_pos == _limitPos)
+      FlushWithCheck();  
+  }
+  
+  Byte GetByte(UInt32 distance) const
+  {
+    UInt32 pos = _pos - distance - 1;
+    if (pos >= _bufferSize)
+      pos += _bufferSize;
+    return _buffer[pos]; 
+  }
+};
+
+#endif