C++11 library providing functionality common to all adapters.
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// This file is under GNU General Public License 3.0
// see LICENSE.txt
#ifndef LIBPEPADAPTER_STD_UTILS_HXX
#define LIBPEPADAPTER_STD_UTILS_HXX
#include <sstream>
#include <fstream>
#include <iterator>
namespace pEp {
namespace Utils {
template<typename T>
std::string to_string(const std::vector<T>& v)
{
std::stringstream ss;
for (const T& elem : v) {
ss << elem << std::endl;
}
return ss.str();
}
template<typename T>
std::vector<T> file_read_bin(const std::string &filename)
{
std::vector<T> ret{};
if (pEp::Utils::path_exists(filename)) {
std::ifstream ifs(filename, std::ios_base::binary);
ifs.unsetf(std::ios_base::skipws);
if (ifs.bad()) {
throw std::runtime_error("failed to read file: '" + filename + "'");
}
ret = { std::istream_iterator<T>(ifs), std::istream_iterator<T>() };
} else {
throw std::runtime_error("File does not exist: '" + filename + "'");
}
return ret;
}
template<typename T>
void file_write_bin(const std::string &filename, std::vector<T> &data)
{
std::fstream f(filename, std::ios_base::out | std::ios_base::binary | std::ios_base::trunc);
f.write(data.data(), static_cast<std::streamsize>(data.size()));
if (f.bad()) {
throw std::runtime_error("failed to write file: '" + filename + "'");
}
}
template<class T>
std::string bin2hex(const T &bin)
{
std::string ret{};
std::stringstream ss{};
for (const auto &i : bin) {
ss << std::hex << std::setfill('0') << std::setw(2) << (int)i;
}
ret = ss.str();
return ret;
}
template<class T>
T hex2bin(const std::string &hex_str)
{
T ret{};
if ((hex_str.size() % 2) != 0) {
throw std::runtime_error("hex2bin: Invalid hex string: must be even length");
}
for (int i = 0; i < hex_str.size(); i += 2) {
std::ostringstream val_hex{};
val_hex << hex_str.at(i);
val_hex << hex_str.at(i + 1);
int val_int;
std::istringstream conv_ss{ val_hex.str() };
conv_ss >> std::hex >> val_int;
if (conv_ss.fail()) {
throw std::runtime_error("hex2bin: invalid hex string" + hex_str);
}
ret.push_back(static_cast<typename T::value_type>(val_int));
}
return ret;
// alternative way
// std::string extract;
// for (std::string::const_iterator pos = hex_str.begin(); pos < hex_str.end(); pos += 2) {
// extract.assign(pos, pos + 2);
// ret.push_back(std::stoi(extract, nullptr, 16));
// }
// return ret;
}
} // namespace Utils
} // namespace pEp
#endif // LIBPEPADAPTER_STD_UTILS_HXX