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#include "file.h"
#include "unicode.h"
#include <boost/endian/conversion.hpp>
#include <filesystem>
#include <functional>
#include <iostream>
#include <string>
#include <unordered_map>
namespace fs = std::filesystem;
namespace {
void usage()
{
std::cout << "Usage: validate <format> <file>" << std::endl;
std::cout << "Format:" << std::endl;
std::cout << " UTF-8 UTF-8" << std::endl;
std::cout << " UTF-16 UTF-16, big or little 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, big or little 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 << "Exit code: 0 if valid, 1 otherwise." << std::endl;
}
std::unordered_map<std::string, std::function<bool(const std::string&)>> validate_map
{
{ "UTF-8", [](const std::string& s) -> bool { return unicode::is_valid_utf(s); }},
{ "UTF-16", [](const std::string& s) -> bool
{
if (s.size() & 1) // need even number of bytes
return false;
std::u16string data(s.size() / 2, u'\0');
std::memcpy(data.data(), s.data(), s.size());
if (unicode::is_valid_utf(data))
return true;
// maybe reverse endianess
std::for_each(data.begin(), data.end(), [](char16_t& c){boost::endian::endian_reverse_inplace(c);});
return unicode::is_valid_utf(data);
}
},
{ "UTF-16LE", [](const std::string& s) -> bool
{
if (s.size() & 1) // need even number of bytes
return false;
std::u16string data(s.size() / 2, u'\0');
std::memcpy(data.data(), s.data(), s.size());
if (boost::endian::order::native != boost::endian::order::little)
std::for_each(data.begin(), data.end(), [](char16_t& c){boost::endian::native_to_little_inplace(c);});
return unicode::is_valid_utf(data);
}
},
{ "UTF-16BE", [](const std::string& s) -> bool
{
if (s.size() & 1) // need even number of bytes
return false;
std::u16string data(s.size() / 2, u'\0');
std::memcpy(data.data(), s.data(), s.size());
if (boost::endian::order::native != boost::endian::order::big)
std::for_each(data.begin(), data.end(), [](char16_t& c){boost::endian::native_to_big_inplace(c);});
return unicode::is_valid_utf(data);
}
},
{ "UTF-32", [](const std::string& s) -> bool
{
if (s.size() & 3) // need even number of bytes
return false;
std::u32string data(s.size() / 4, U'\0');
std::memcpy(data.data(), s.data(), s.size());
if (unicode::is_valid_utf(data))
return true;
// maybe reverse endianess
std::for_each(data.begin(), data.end(), [](char32_t& c){boost::endian::endian_reverse_inplace(c);});
return unicode::is_valid_utf(data);
}
},
{ "UTF-32LE", [](const std::string& s) -> bool
{
if (s.size() & 3) // need multiple of 4 bytes
return false;
std::u32string data(s.size() / 4, U'\0');
std::memcpy(data.data(), s.data(), s.size());
if (boost::endian::order::native != boost::endian::order::little)
std::for_each(data.begin(), data.end(), [](char32_t& c){boost::endian::native_to_little_inplace(c);});
return unicode::is_valid_utf(data);
}
},
{ "UTF-32BE", [](const std::string& s) -> bool
{
if (s.size() & 3) // need multiple of 4 bytes
return false;
std::u32string data(s.size() / 4, U'\0');
std::memcpy(data.data(), s.data(), s.size());
if (boost::endian::order::native != boost::endian::order::big)
std::for_each(data.begin(), data.end(), [](char32_t& c){boost::endian::native_to_big_inplace(c);});
return unicode::is_valid_utf(data);
}
},
};
}
int main(int argc, char* argv[])
{
if (argc != 3) {
usage();
return 1;
}
try {
std::string format {argv[1]};
fs::path path {argv[2]};
std::string data{unicode::File::getFile(path)};
auto it { validate_map.find(format) };
if (it == validate_map.end()) {
std::cerr << "Error: Encoding " << format << " not supported." << std::endl;
return 1;
}
return it->second(data) ? 0 : 1;
} catch (const std::exception& ex) {
std::cerr << "Error: " << ex.what() << std::endl;
return 1;
}
return 0;
}
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