From 4aca87515a5083ae0e31ce3177189fd43b6d05ac Mon Sep 17 00:00:00 2001
From: Andreas Baumann <mail@andreasbaumann.cc>
Date: Sat, 3 Jan 2015 13:58:15 +0100
Subject: patch to Vanilla Tomato 1.28

---
 .../squashfs/lzma/C/7zip/Compress/LZ/LZInWindow.h  | 84 ++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 release/src/linux/linux/scripts/squashfs/lzma/C/7zip/Compress/LZ/LZInWindow.h

(limited to 'release/src/linux/linux/scripts/squashfs/lzma/C/7zip/Compress/LZ/LZInWindow.h')

diff --git a/release/src/linux/linux/scripts/squashfs/lzma/C/7zip/Compress/LZ/LZInWindow.h b/release/src/linux/linux/scripts/squashfs/lzma/C/7zip/Compress/LZ/LZInWindow.h
new file mode 100644
index 00000000..7dc194f2
--- /dev/null
+++ b/release/src/linux/linux/scripts/squashfs/lzma/C/7zip/Compress/LZ/LZInWindow.h
@@ -0,0 +1,84 @@
+// LZInWindow.h
+
+#ifndef __LZ_IN_WINDOW_H
+#define __LZ_IN_WINDOW_H
+
+#include "../../IStream.h"
+
+class CLZInWindow
+{
+  Byte *_bufferBase; // pointer to buffer with data
+  ISequentialInStream *_stream;
+  UInt32 _posLimit;  // offset (from _buffer) of first byte when new block reading must be done
+  bool _streamEndWasReached; // if (true) then _streamPos shows real end of stream
+  const Byte *_pointerToLastSafePosition;
+protected:
+  Byte  *_buffer;   // Pointer to virtual Buffer begin
+  UInt32 _blockSize;  // Size of Allocated memory block
+  UInt32 _pos;             // offset (from _buffer) of curent byte
+  UInt32 _keepSizeBefore;  // how many BYTEs must be kept in buffer before _pos
+  UInt32 _keepSizeAfter;   // how many BYTEs must be kept buffer after _pos
+  UInt32 _keepSizeReserv;  // how many BYTEs must be kept as reserv
+  UInt32 _streamPos;   // offset (from _buffer) of first not read byte from Stream
+
+  virtual void BeforeMoveBlock() {};
+  virtual void AfterMoveBlock() {};
+  void MoveBlock();
+  virtual HRESULT ReadBlock();
+  void Free();
+public:
+  CLZInWindow(): _bufferBase(0) {}
+  virtual ~CLZInWindow() { Free(); }
+
+  bool Create(UInt32 keepSizeBefore, UInt32 keepSizeAfter, 
+      UInt32 keepSizeReserv = (1<<17));
+
+  HRESULT Init(ISequentialInStream *stream);
+  // void ReleaseStream();
+
+  Byte *GetBuffer() const { return _buffer; }
+
+  const Byte *GetPointerToCurrentPos() const { return _buffer + _pos; }
+
+  HRESULT MovePos()
+  {
+    _pos++;
+    if (_pos > _posLimit)
+    {
+      const Byte *pointerToPostion = _buffer + _pos;
+      if(pointerToPostion > _pointerToLastSafePosition)
+        MoveBlock();
+      return ReadBlock();
+    }
+    else
+      return S_OK;
+  }
+  Byte GetIndexByte(Int32 index)const
+    {  return _buffer[(size_t)_pos + index]; }
+
+  // index + limit have not to exceed _keepSizeAfter;
+  UInt32 GetMatchLen(Int32 index, UInt32 distance, UInt32 limit) const
+  {  
+    if(_streamEndWasReached)
+      if ((_pos + index) + limit > _streamPos)
+        limit = _streamPos - (_pos + index);
+    distance++;
+    Byte *pby = _buffer + (size_t)_pos + index;
+    UInt32 i;
+    for(i = 0; i < limit && pby[i] == pby[(size_t)i - distance]; i++);
+    return i;
+  }
+
+  UInt32 GetNumAvailableBytes() const { return _streamPos - _pos; }
+
+  void ReduceOffsets(Int32 subValue)
+  {
+    _buffer += subValue;
+    _posLimit -= subValue;
+    _pos -= subValue;
+    _streamPos -= subValue;
+  }
+
+};
+
+#endif
-- 
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