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