The following code creates a ( recursive ) backup of a directory in the form of interlinked HTML files, structured in the same form as the input directory.
It does not take the backup of the contents of a directory, just stores the names and sizes of all the files and folders contained in the directory.
( It can be thought of as a hyperlinked version of the dir /s or tree /f commands. )
For more details, refer this.
#include <iostream>
#include <sstream>
#include <fstream>
#include <string>
#include <cassert>
#include <vector>
#include <cstdlib>
#include <boost/filesystem.hpp>
using namespace std;
using namespace boost::filesystem;
const path LogFileName = "DirectorySnapshotLog.txt";
ofstream Log;
// Buffer soft errors to output them separately after the informational messages in the log file.
stringstream LogErrorStream;
// Convert any type to its string representation
template<typename T> std::string ToString( const T obj )
{
std::stringstream ss;
ss << obj;
return ss.str();
}
// Convert the input size ( in bytes ) to its nearest units in the ratio of 1024.
// ( Trying to do what Windows does on right-clicking the properties of a folder )
string RoundSize( const long long& size )
{
double ret = ( double )size;
vector<string> units;
units.push_back( "bytes" );
units.push_back( "KB" );
units.push_back( "MB" );
units.push_back( "GB" );
units.push_back( "TB" );
const unsigned ratio = 1024;
unsigned i = 0;
while ( ret > ratio && i < units.size() - 1 )
{
ret /= ratio;
i++;
}
return ToString( ret ) + " " + units[i];
}
// Iterate through a directory and store everything found ( regular files, directories or any other special files ) in the input container
void DirectoryIterate( const path& dirPath, vector<path>& dirContents )
{
if ( exists( dirPath ) && is_directory( dirPath ) )
{
copy( directory_iterator( dirPath ), directory_iterator(), back_inserter( dirContents ) );
}
}
// Create a set of HTML files containing information about source directory's contents and store it in the destination directory, in a directory structure similar to the source directory
// Returns the total size of the sourcePath directory
long long Snapshot( const path& sourcePath, const path& destinationPath )
{
Log << sourcePath << endl;
long long sourcePathSize = 0; // Total size of the source directory
vector<path> dirContents, files, directories;
DirectoryIterate( sourcePath, dirContents );
sort( dirContents.begin(), dirContents.end() ); // sort, since directory iteration is not ordered on some file systems
for ( const auto& item : dirContents )
{
if ( is_directory( item ) )
{
directories.push_back( item );
}
else
{
files.push_back( item );
}
}
const string sourcePathName = sourcePath.filename().string(); // Name of the source folder
path pwd = destinationPath / sourcePathName; // Present working directory
boost::system::error_code ec;
create_directory( pwd, ec );
if ( ec )
{
LogErrorStream << "Error creating " << absolute( pwd ) << " : " << ec.message() << endl;
return 0;
}
// Write the HTML file header.
const path outFilePath = ( pwd / sourcePathName ).string() + ".html";
ofstream outFile( outFilePath.string() );
if ( !outFile )
{
LogErrorStream << "Error creating " << absolute( outFilePath ) << " : " << strerror( errno ) << endl;
return 0;
}
outFile << "<!DOCTYPE html>\n";
outFile << "<meta charset=\"UTF-8\">\n";
outFile << "<html>\n";
outFile << "<title>" << sourcePathName << "</title>\n";
outFile << "<body>\n";
// Write information about the files
outFile << "<h1> Files </h1>\n";
for ( const auto& file : files )
{
auto size = file_size( file );
outFile << file.filename() << "----" << RoundSize( size ) << "<br>\n";
sourcePathSize += size;
}
// Write information about the directories
outFile << "<h1> Directories </h1>\n";
for ( const auto& directory : directories )
{
long long size = Snapshot( sourcePath / directory.filename(), pwd );
sourcePathSize += size;
outFile << "<a href=\"" << ( directory.filename() / directory.filename() ).generic_string() << ".html\">" << directory.filename() << "</a>----" << RoundSize( size ) << "<br>\n";
}
// Write the footer
outFile << "<br>\n";
outFile << "<h3>Total directory size = " << RoundSize( sourcePathSize ) << "</h3><br>\n";
outFile << "</body>\n";
outFile << "</html>\n";
return sourcePathSize;
}
int main()
{
string sourcePath, destinationPath;
cout << "Enter source directory path -:\n";
getline( cin, sourcePath );
if ( !is_directory( sourcePath ) )
{
cout << absolute( sourcePath ) << " is not a directory !\n";
return -1;
}
cout << "Enter destination directory path -:\n";
getline( cin, destinationPath );
if ( !is_directory( destinationPath ) )
{
cout << absolute( destinationPath ) << " is not a directory !\n";
return -1;
}
cout << "\n";
Log.open( LogFileName.string() );
if ( !Log )
{
cerr << "Error creating " << absolute( LogFileName ) << " : " << strerror( errno ) << endl;
}
Snapshot( sourcePath, destinationPath );
if ( Log )
{
if ( LogErrorStream.str().empty() )
{
cout << "The program ran without any errors.\n";
}
else
{
Log << "ERRORS -:\n" << LogErrorStream.str() << endl;
cout << "There were some errors during the execution of this program !\n\nCheck " << absolute( LogFileName ) << " for details.\n";
}
}
}
`