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#ifndef COMPONENTS_FILES_UTILS_H
#define COMPONENTS_FILES_UTILS_H
#include <cerrno>
#include <format>
#include <istream>
#include <stdexcept>
#include <system_error>
namespace Files
{
inline std::streamsize getStreamSizeLeft(std::istream& stream)
{
const auto begin = stream.tellg();
if (stream.fail())
throw std::runtime_error(
std::format("Failed to get current file position: {}", std::generic_category().message(errno)));
stream.seekg(0, std::ios_base::end);
if (stream.fail())
throw std::runtime_error(
std::format("Failed to seek end file position: {}", std::generic_category().message(errno)));
const auto end = stream.tellg();
if (stream.fail())
throw std::runtime_error(
std::format("Failed to get current file position: {}", std::generic_category().message(errno)));
stream.seekg(begin);
if (stream.fail())
throw std::runtime_error(
std::format("Failed to seek original file position: {}", std::generic_category().message(errno)));
return end - begin;
}
}
#endif
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