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/ChunkedFile.h

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+//---------------------------------------------------------------------------
+// ChunkedFile.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(ChunkedFile_H)
+  #define ChunkedFile_H
+
+  #include "GlobalTypes.h"
+  #include "adler32.h"
+  #include <iostream>
+  #include <algorithm>
+
+  // private data type: the data tree information
+  typedef struct TChunkChecksum {
+    Checksum::uLong adler32;
+    CHECKSUM_BLOCK v;
+  } TChunkChecksum;
+
+  inline bool operator<(const TChunkChecksum& a, const TChunkChecksum& b) {
+    return (a.adler32 < b.adler32) ? true : (
+            (a.adler32 == b.adler32) ? (a.v < b.v) : false
+                                            );
+  }
+  inline bool operator==(const TChunkChecksum& a, const TChunkChecksum& b) {
+    return (a.v == b.v) && (a.adler32 == b.adler32);
+  }
+
+  typedef struct FileChunk {
+    TFileOffset offset;
+    TChunkChecksum checksum;
+  } FileChunk;
+
+  inline bool operator<(const FileChunk& a, const FileChunk& b) {
+    return a.checksum < b.checksum;
+  }
+
+  class ChunkedFile {
+    public:
+      TFileOffset chunkCount;
+      FileChunk* chunks;
+
+      ChunkedFile(bistream& f, TFileOffset fSize, TFileOffset chunkSize);
+
+      ~ChunkedFile() {
+        if(chunks != NULL) delete[] chunks;
+      }
+
+      bool search(TChunkChecksum key, TFileOffset* start);
+
+      inline void calculateChecksum(unsigned char* data, TFileOffset size, TChunkChecksum& K) {
+        K.v = *reinterpret_cast<CHECKSUM_BLOCK*>(data);
+        K.adler32 = Checksum::adler32(1L,data,size);
+      }
+  };
+
+#endif // ChunkedFile_H