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#include "file.h"
#include "unicode.h"
#include <boost/algorithm/string/predicate.hpp>
#include <boost/endian/conversion.hpp>
#include <boost/version.hpp>
#include <algorithm>
#include <filesystem>
#include <functional>
#include <iostream>
#include <string>
#include <tuple>
#include <unordered_map>
namespace fs = std::filesystem;
using namespace std::string_literals;
namespace {
void usage()
{
std::cout << "Usage: recode <from-format> <from-file> <to-format> <to-file>" << std::endl;
std::cout << "Format:" << std::endl;
std::cout << " UTF-8 UTF-8" << std::endl;
std::cout << " UTF-16 UTF-16, native endian" << std::endl;
std::cout << " UTF-16LE UTF-16, little endian" << std::endl;
std::cout << " UTF-16BE UTF-16, big endian" << std::endl;
std::cout << " UTF-32 UTF-32, native endian" << std::endl;
std::cout << " UTF-32LE UTF-32, little endian" << std::endl;
std::cout << " UTF-32BE UTF-32, big endian" << std::endl;
std::cout << " ISO-8859-1 ISO-8859-1 (Latin-1)" << std::endl;
std::cout << " ISO-8859-15 ISO-8859-15 (Latin-9)" << std::endl;
std::cout << "Exit code: 0 if valid, 1 otherwise." << std::endl;
}
std::unordered_map<std::string, std::string> typeid_name_map
{
{ "UTF-8", typeid(unicode::UTF_8).name() },
{ "UTF-16", typeid(unicode::UTF_16).name() },
{ "UTF-16LE", typeid(unicode::UTF_16).name() },
{ "UTF-16BE", typeid(unicode::UTF_16).name() },
{ "UTF-32", typeid(unicode::UTF_32).name() },
{ "UTF-32LE", typeid(unicode::UTF_32).name() },
{ "UTF-32BE", typeid(unicode::UTF_32).name() },
{ "ISO-8859-1", typeid(unicode::ISO_8859_1).name() },
{ "ISO-8859-15", typeid(unicode::ISO_8859_15).name() },
};
std::string get_id(const std::string& from, const std::string& to)
{
return from + "," + to;
}
template<typename From, typename To>
std::string get_id()
{
return get_id(std::string{typeid(From).name()}, typeid(To).name());
}
// workaround for broken boost::endian::endian_reverse_inplace for C++20 in boost 1.74
template<typename T>
void reverse_endian_inplace(T& c)
{
size_t size{sizeof(T)};
uint8_t* p{reinterpret_cast<uint8_t*>(&c)};
for (int i = 0; i < size / 2; i++) {
std::swap(p[i], p[size - 1 - i]);
}
}
template<typename T>
void reverse_endian(std::basic_string<T>& s)
{
std::for_each(s.begin(), s.end(), [](T& c){
#if BOOST_VERSION > 107700
boost::endian::endian_reverse_inplace(c);
#else
reverse_endian_inplace(c);
#endif
});
}
std::unordered_map<std::string, std::function<std::string(const std::string&, bool, bool)>> convert_map {};
template<typename From, typename To>
void register_convert()
{
std::string id{ get_id<From, To>() };
std::function<std::string(const std::string&, bool, bool)> f([](const std::string& s, bool swap_from_endian, bool swap_to_endian) -> std::string
{
if (s.size() % sizeof(typename From::value_type) != 0)
throw std::invalid_argument("Bad number of input bytes. Need multiple of "s + std::to_string(sizeof(typename From::value_type)) + ", got " + std::to_string(s.size()));
std::basic_string<typename From::value_type> from_data(s.size() / sizeof(typename From::value_type), static_cast<typename From::value_type>(0));
std::memcpy(from_data.data(), s.data(), s.size());
if (swap_from_endian) {
reverse_endian(from_data);
}
std::basic_string<typename To::value_type> to_data {unicode::convert<From, To>(from_data)};
if (swap_to_endian) {
reverse_endian(to_data);
}
std::string result(to_data.size() * sizeof(typename To::value_type), '\0');
std::memcpy(result.data(), to_data.data(), to_data.size() * sizeof(typename To::value_type));
return result;
});
convert_map[id] = f;
}
template<int N, typename... Ts> using NthTypeOf =
typename std::tuple_element<N, std::tuple<Ts...>>::type;
template<size_t i, size_t j, typename ...Ts>
void iterate_over()
{
register_convert<NthTypeOf<i,Ts...>, NthTypeOf<j,Ts...>>();
if constexpr (i + 1 < sizeof...(Ts)) {
iterate_over<i + 1, j, Ts...>();
} else if constexpr (j + 1 < sizeof...(Ts)) {
iterate_over<0, j + 1, Ts...>();
}
}
template<typename...Ts>
void build_map()
{
iterate_over<0, 0, Ts...>();
}
}
int main(int argc, char* argv[])
{
if (argc != 5) {
usage();
return 1;
}
try {
build_map<unicode::UTF_8, unicode::UTF_16, unicode::UTF_32, unicode::ISO_8859_1, unicode::ISO_8859_15>();
std::string from_format {argv[1]};
fs::path from_path {argv[2]};
std::string to_format {argv[3]};
fs::path to_path {argv[4]};
std::string data{unicode::File::getFile(from_path)};
auto it_from{typeid_name_map.find(from_format)};
if (it_from == typeid_name_map.end())
throw std::invalid_argument("Bad input format: "s + from_format);
auto it_to{typeid_name_map.find(to_format)};
if (it_to == typeid_name_map.end())
throw std::invalid_argument("Bad output format: "s + to_format);
std::string id{get_id(it_from->second, it_to->second)};
auto it { convert_map.find(id) };
if (it == convert_map.end()) {
std::cerr << "Error: Conversion ID " << id << " not supported." << std::endl;
return 1;
}
bool swap_from_endian{(boost::algorithm::ends_with(from_format, "LE") && boost::endian::order::native != boost::endian::order::little) ||
(boost::algorithm::ends_with(from_format, "BE") && boost::endian::order::native != boost::endian::order::big)};
bool swap_to_endian{(boost::algorithm::ends_with(to_format, "LE") && boost::endian::order::native != boost::endian::order::little) ||
(boost::algorithm::ends_with(to_format, "BE") && boost::endian::order::native != boost::endian::order::big)};
// actual conversion
std::string to_data{it->second(data, swap_from_endian, swap_to_endian)};
unicode::File::setFile(to_path, to_data);
} catch (const std::exception& ex) {
std::cerr << "Error: " << ex.what() << std::endl;
return 1;
}
return 0;
}
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