#include "Data.h"
#include <stdexcept>

using std::istream;
using std::ofstream;
using std::ifstream;
using std::ios;

namespace bf = boost::filesystem;

namespace cpputils {

boost::optional<Data> Data::LoadFromFile(const bf::path &filepath) {
  ifstream file(filepath.c_str(), ios::binary);
  if (!file.good()) {
    return boost::none;
  }
  return LoadFromStream(file);
}

std::streampos Data::_getStreamSize(istream &stream) {
  auto current_pos = stream.tellg();

  //Retrieve length
  stream.seekg(0, stream.end);
  auto endpos = stream.tellg();

  //Restore old position
  stream.seekg(current_pos, stream.beg);

  return endpos - current_pos;
}

Data Data::LoadFromStream(istream &stream, size_t size) {
  Data result(size);
  stream.read(static_cast<char*>(result.data()), result.size());
  return std::move(result);
}

}