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#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <list>
#include <exception>
#include <boost/filesystem/operations.hpp>
#include <boost/filesystem/fstream.hpp>
#include <boost/iostreams/copy.hpp>
#include <boost/iostreams/device/array.hpp>
#include <boost/iostreams/filtering_streambuf.hpp>
#include <boost/iostreams/filter/gzip.hpp>
#ifdef _WIN32
#define DIR_SEPARATOR "\\"
#else
#define DIR_SEPARATOR "/"
#endif
using namespace std;
class my_exception : public exception
{
private:
string cause;
public:
my_exception(const string& cause) : cause(cause) { }
~my_exception() throw () { }
virtual const char* what() const throw() { return cause.c_str(); }
};
struct index_entry
{
index_entry(const string& file_name, bool is_dir) : file_name(file_name), is_dir(is_dir), file_size(0) { }
unsigned int file_size;
string file_name;
bool is_dir;
};
class paq_extractor
{
private:
list<index_entry> index;
vector<char> files;
void process(const vector<char>& v)
{
unsigned int i = 4, depth = 1;
while (depth)
{
unsigned int fname_size = static_cast<unsigned char>(v[i++]);
if (fname_size)
{
if (i + fname_size + 6 > v.size()) throw my_exception("Unexpected end of PAQ file");
index.push_back(index_entry(string(&v[i], &v[i + fname_size]), v[i + fname_size + 4]));
if (index.back().is_dir)
++depth;
else
index.back().file_size = *reinterpret_cast<const unsigned int*>(&v[i + fname_size]);
i += fname_size + 5;
}
else
{
index.push_back(index_entry(string(""), 0));
--depth;
}
}
files.assign(v.begin() + i, v.end());
for(list<index_entry>::iterator i_it = index.begin(); i_it != index.end(); i_it++)
i += i_it->file_size;
if (i < v.size()) throw my_exception("Unexpected end of PAQ file");
}
void extract_r(string path, list<index_entry>::iterator& i_it, vector<char>::iterator& f_it)
{
boost::filesystem::create_directory(path);
for(i_it; i_it->file_name.size() != 0; i_it++)
if (i_it->is_dir)
extract_r(path + DIR_SEPARATOR + i_it++->file_name, i_it, f_it);
else
{
const string file_path = path + DIR_SEPARATOR + i_it->file_name;
cout << "Extracting " << file_path << endl;
ofstream out(file_path.c_str(), ios::binary);
if (!out) throw my_exception(string("Can't open ") + file_path);
if (i_it->file_size > 4)
{
boost::iostreams::filtering_streambuf<boost::iostreams::input> in;
in.push(boost::iostreams::gzip_decompressor());
in.push(boost::iostreams::array_source(&(*f_it) + 4, i_it->file_size - 4));
boost::iostreams::copy(in, out);
out.close();
if (*reinterpret_cast<unsigned int*>(&(*f_it)) != boost::filesystem::file_size(file_path)) throw my_exception(string("Uncompressed file size of ") + file_path + " inconsistent with PAQ entry for this file");
}
f_it += i_it->file_size;
}
}
void print_r(string path, list<index_entry>::iterator& i_it)
{
for(i_it; i_it->file_name.size() != 0; i_it++)
if (i_it->is_dir)
print_r(path + DIR_SEPARATOR + i_it++->file_name, i_it);
else
cout << (path + DIR_SEPARATOR + i_it->file_name).c_str() + 1 << endl;
}
public:
paq_extractor(const char* paq_path)
{
ifstream paq(paq_path, ios::binary);
if (!paq) throw my_exception(string("Can't open ") + paq_path);
unsigned int file_size = boost::filesystem::file_size(paq_path);
if (file_size < 5) throw my_exception(string(paq_path) + " doesn't seem to be a valid PAQ archive");
vector<char> v(file_size);
paq.read(&v[0], file_size);
paq.close();
if (*reinterpret_cast<unsigned int*>(&v[0]) != 0x5141504E) throw my_exception("No valid signature found in PAQ file");
process(v);
}
void extract_to(const char* path) { list<index_entry>::iterator ib = index.begin(); vector<char>::iterator fb = files.begin(); extract_r(string(path), ib, fb); }
void print_index() { list<index_entry>::iterator b = index.begin(); print_r(string(), b); }
};
class paq_builder
{
private:
list<index_entry> index;
list<vector<char> > files;
void process(string path)
{
boost::filesystem::directory_iterator end;
for (boost::filesystem::directory_iterator itr(path.c_str()); itr != end ; ++itr)
{
index.push_back(index_entry(itr->filename(), boost::filesystem::is_directory(itr->status())));
if (index.back().is_dir)
process(path + DIR_SEPARATOR + itr->filename());
else
{
cout << "Adding " << path << DIR_SEPARATOR << itr->filename() << endl;
ifstream in(itr->string().c_str(), ios::binary);
if (!in) throw my_exception(string("Can't open ") + itr->string());
vector<char> v(4);
*reinterpret_cast<unsigned int*>(&v[0]) = boost::filesystem::file_size(itr->path());
boost::iostreams::filtering_streambuf<boost::iostreams::output> out;
out.push(boost::iostreams::gzip_compressor());
out.push(boost::iostreams::back_inserter(v));
boost::iostreams::copy(in, out);
files.push_back(v);
}
}
index.push_back(index_entry(string(""), 0));
}
public:
paq_builder(const char* path)
{
if (!boost::filesystem::exists(path) || !boost::filesystem::is_directory(path))
throw my_exception(string(path) + " doesn't exist or isn't a directory!");
process(string(path));
}
void write_to_file(const char* path)
{
ofstream paq(path, ios::binary);
if (!paq) throw my_exception(string("Can't open ") + path);
paq.write("NPAQ", 4);
list<vector<char> >::iterator f_it = files.begin();
for (list<index_entry>::iterator i_it = index.begin(); i_it != index.end(); i_it++)
{
paq << static_cast<char>(i_it->file_name.size());
if (i_it->file_name.size())
{
paq.write(i_it->file_name.c_str(), i_it->file_name.size());
unsigned int file_size = i_it->is_dir ? 0 : f_it++->size();
paq.write(reinterpret_cast<char*>(&file_size), 4);
paq << static_cast<char>(file_size ? 0 : 1);
}
}
for(f_it = files.begin(); f_it != files.end(); f_it++)
paq.write(&(*f_it)[0], f_it->size());
}
};
void process_command_line(int argc, char** argv)
{
if (argc < 2 || !strcmp(argv[1], "--help") || !strcmp(argv[1], "-h") || !strcmp(argv[1], "/?"))
{
cout << "PAQ archiving utility, version 1.0 (" << __DATE__ << ")" << endl;
cout << "Copyright (C) 2009 Jes, http://www.bessab.com" << endl << endl;
cout << "Usage: " << argv[0] << " [action] [paq file] {in/out directory}" << endl << endl;
cout << " The following actions are supported:" << endl << endl;
cout << " -l list files in a PAQ archive" << endl;
cout << " -x extract PAQ archive to the specified directory" << endl;
cout << " -c create PAQ archive of an entire directory (including its sub-directories)" << endl;
return;
}
if (!strcmp(argv[1], "-c") && argc > 3)
{
paq_builder(argv[3]).write_to_file(argv[2]);
return;
}
if (!strcmp(argv[1], "-x") && argc > 3)
{
paq_extractor(argv[2]).extract_to(argv[3]);
return;
}
if (!strcmp(argv[1], "-l") && argc > 2)
{
paq_extractor(argv[2]).print_index();
return;
}
throw my_exception("Syntax error in the command line, use --help option for any help");
}
int main(int argc, char** argv)
{
try
{
process_command_line(argc, argv);
}
catch (exception& e)
{
cerr << e.what() << endl;
return -1;
}
return 0;
}
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