initial version ( megaglest 3.2.3-beta3 )

source/shared_lib/sources/util/checksum.cpp

@@ -0,0 +1,70 @@
+// ==============================================================
+//	This file is part of Glest Shared Library (www.glest.org)
+//
+//	Copyright (C) 2001-2008 Marti<74>o Figueroa
+//
+//	You can redistribute this code and/or modify it under 
+//	the terms of the GNU General Public License as published 
+//	by the Free Software Foundation; either version 2 of the 
+//	License, or (at your option) any later version
+// ==============================================================
+
+#include "checksum.h"
+
+#include <cassert>
+#include <stdexcept>
+
+#include "util.h"
+#include "leak_dumper.h"
+
+using namespace std;
+
+namespace Shared{ namespace Util{
+
+// =====================================================
+//	class Checksum
+// =====================================================
+
+Checksum::Checksum(){
+	sum= 0;
+	r= 55665; 
+	c1= 52845; 
+	c2= 22719;
+}
+
+void Checksum::addByte(int8 value){
+	int32 cipher= (value ^ (r >> 8));
+	
+	r= (cipher + r) * c1 + c2;
+	sum+= cipher;
+}
+
+void Checksum::addString(const string &value){
+	for(int i= 0; i<value.size(); ++i){
+		addByte(value[i]);
+	}
+}
+
+void Checksum::addFile(const string &path){
+	
+	FILE* file= fopen(path.c_str(), "rb");
+
+	if(file!=NULL){
+
+		addString(lastFile(path));
+
+		while(!feof(file)){
+			int8 byte= 0;
+
+			fread(&byte, 1, 1, file);
+			addByte(byte);
+		}
+	}
+	else
+	{
+		throw runtime_error("Can not open file: " + path);
+	}
+	fclose(file);
+}
+
+}}//end namespace