VPatch 3.0

git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@4271 212acab6-be3b-0410-9dea-997c60f758d6

Contrib/VPatch/Source/GenPat/PatchGenerator.h

@@ -0,0 +1,72 @@
+//---------------------------------------------------------------------------
+// PatchGenerator.h
+//---------------------------------------------------------------------------
+//                           -=* VPatch *=-
+//---------------------------------------------------------------------------
+// Copyright (C) 2001-2005 Koen van de Sande / Van de Sande Productions
+//---------------------------------------------------------------------------
+// Website: http://www.tibed.net/vpatch
+//
+// This software is provided 'as-is', without any express or implied
+// warranty.  In no event will the authors be held liable for any damages
+// arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented; you must not
+//    claim that you wrote the original software. If you use this software
+//    in a product, an acknowledgment in the product documentation would be
+//    appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//    misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+
+#if !defined(PatchGenerator_H)
+  #define PatchGenerator_H
+
+  #include <iostream>
+  #include <vector>
+  #include "GlobalTypes.h"
+  #include "ChunkedFile.h"
+
+  using namespace std;
+
+  typedef struct SameBlock {
+    TFileOffset sourceOffset;
+    TFileOffset targetOffset;
+    TFileOffset size;
+  } SameBlock;
+
+  class PatchGenerator {
+  protected:
+    bistream& source;
+    TFileOffset sourceSize;
+    bistream& target;
+    TFileOffset targetSize;
+    bostream& patch;
+
+    // cache
+    unsigned char* targetCData;
+    TFileOffset targetCDataBaseOffset;
+    TFileOffset targetCDataSize;
+
+    SameBlock* PatchGenerator::findBlock(ChunkedFile* sourceTree,
+                                         TFileOffset targetFileStartOffset);
+//    SameBlock* findBlock(ChunkedFile* sourceTree, unsigned char* targetData, TFileOffset targetStartOffset);
+    void improveSameBlockMatch(SameBlock& match, TFileOffset currentBest = 0);
+  public:
+    TFileOffset blockSize;
+    int maxMatches;
+    bool beVerbose;
+
+    // load in the source, target streams
+    PatchGenerator(bistream& source, TFileOffset sourceSize, bistream& target, TFileOffset targetSize, bostream& patch);
+    ~PatchGenerator();
+
+    // construct the actual patch
+    void execute(vector<SameBlock*>& sameBlocks);
+  };
+
+#endif // PatchGenerator_H