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#include "format.hpp"
#include <cstring>
#include <istream>
#include <stdexcept>
#include <string>
namespace ESM
{
namespace
{
bool isValidFormat(std::uint32_t value)
{
return value == static_cast<std::uint32_t>(Format::Tes3)
|| value == static_cast<std::uint32_t>(Format::Tes4);
}
Format toFormat(std::uint32_t value)
{
if (!isValidFormat(value))
throw std::runtime_error("Invalid format: " + std::to_string(value));
return static_cast<Format>(value);
}
}
Format readFormat(std::istream& stream)
{
std::uint32_t format = 0;
stream.read(reinterpret_cast<char*>(&format), sizeof(format));
if (stream.gcount() != sizeof(format))
throw std::runtime_error("Not enough bytes to read file header");
return toFormat(format);
}
Format parseFormat(std::string_view value)
{
if (value.size() != sizeof(std::uint32_t))
throw std::logic_error("Invalid format value: " + std::string(value));
std::uint32_t format;
std::memcpy(&format, value.data(), sizeof(std::uint32_t));
return toFormat(format);
}
}
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