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#include "apps.h"
#include <botan/compression.h>
#include <fstream>
namespace {
void do_compress(Transformation& comp, std::ifstream& in, std::ostream& out)
{
secure_vector<byte> buf;
comp.start();
while(in.good())
{
buf.resize(64*1024);
in.read(reinterpret_cast<char*>(&buf[0]), buf.size());
buf.resize(in.gcount());
comp.update(buf);
out.write(reinterpret_cast<const char*>(&buf[0]), buf.size());
}
buf.clear();
comp.finish(buf);
out.write(reinterpret_cast<const char*>(&buf[0]), buf.size());
}
int compress(int argc, char* argv[])
{
if(argc != 2 && argc != 3)
{
std::cout << "Usage: " << argv[0] << " input [type]\n";
return 1;
}
const std::string in_file = argv[1];
std::ifstream in(in_file.c_str());
if(!in.good())
{
std::cout << "Couldn't read " << in_file << "\n";
return 1;
}
const size_t level = 9;
const std::string suffix = argc == 3 ? argv[2] : "gz";
std::unique_ptr<Transformation> compress(make_compressor(suffix, level));
const std::string out_file = in_file + "." + suffix;
std::ofstream out(out_file.c_str());
do_compress(*compress, in, out);
return 0;
}
void parse_extension(const std::string& in_file,
std::string& out_file,
std::string& suffix)
{
auto last_dot = in_file.find_last_of('.');
if(last_dot == std::string::npos || last_dot == 0)
throw std::runtime_error("No extension detected in filename '" + in_file + "'");
out_file = in_file.substr(0, last_dot);
suffix = in_file.substr(last_dot+1, std::string::npos);
}
int uncompress(int argc, char* argv[])
{
const std::string in_file = argv[1];
std::ifstream in(in_file.c_str());
if(!in.good())
{
std::cout << "Couldn't read " << argv[1] << "\n";
return 1;
}
std::string out_file, suffix;
parse_extension(in_file, out_file, suffix);
std::ofstream out(out_file.c_str());
std::unique_ptr<Transformation> decompress(make_decompressor(suffix));
do_compress(*decompress, in, out);
return 0;
}
REGISTER_APP(compress);
REGISTER_APP(uncompress);
}
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