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// ==============================================================
// This file is part of Glest Shared Library (www.glest.org)
//
// Copyright (C) 2001-2008 Martio 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);
}
}
}}//end namespace
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