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107 lines
2.5 KiB
C++
107 lines
2.5 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 Martio 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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std::map<string,int32> Checksum::fileListCache;
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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::addSum(int32 value) {
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sum+= value;
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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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if(path != "") {
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fileList[path] = 0;
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}
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}
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void Checksum::addFileToSum(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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int32 Checksum::getSum() {
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if(fileList.size() > 0) {
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SystemFlags::OutputDebug(SystemFlags::debugSystem,"In [%s::%s Line: %d] fileList.size() = %d\n",__FILE__,__FUNCTION__,__LINE__,fileList.size());
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Checksum newResult;
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for(std::map<string,int32>::iterator iterMap = fileList.begin();
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iterMap != fileList.end(); iterMap++) {
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if(Checksum::fileListCache.find(iterMap->first) == Checksum::fileListCache.end()) {
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Checksum fileResult;
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fileResult.addFileToSum(iterMap->first);
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Checksum::fileListCache[iterMap->first] = fileResult.getSum();
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//SystemFlags::OutputDebug(SystemFlags::debugSystem,"In [%s::%s Line: %d] iterMap->first [%s] has CRC [%d]\n",__FILE__,__FUNCTION__,__LINE__,iterMap->first.c_str(),Checksum::fileListCache[iterMap->first]);
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}
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newResult.addSum(Checksum::fileListCache[iterMap->first]);
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}
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return newResult.getSum();
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}
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return sum;
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}
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int32 Checksum::getFinalFileListSum() {
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sum = 0;
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return getSum();
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}
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}}//end namespace
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