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#include "formid.hpp"
#include <charconv>
#include <cstring>
std::string ESM::FormId::toString(std::string_view prefix) const
{
std::string res;
res.resize(prefix.length() + 20);
std::memcpy(res.data(), prefix.data(), prefix.size());
char* buf = res.data() + prefix.size();
uint64_t value;
if (hasContentFile())
{
if ((mIndex & 0xff000000) != 0)
throw std::invalid_argument("Invalid FormId index value: " + std::to_string(mIndex));
value = mIndex | (static_cast<uint64_t>(mContentFile) << 24);
}
else
{
*(buf++) = '@';
value = mIndex | (static_cast<uint64_t>(-mContentFile - 1) << 32);
}
*(buf++) = '0';
*(buf++) = 'x';
const auto r = std::to_chars(buf, res.data() + res.size(), value, 16);
if (r.ec != std::errc())
throw std::system_error(std::make_error_code(r.ec), "ESM::FormId::toString failed");
res.resize(r.ptr - res.data());
return res;
}
uint32_t ESM::FormId::toUint32() const
{
if (isSet() && !hasContentFile())
throw std::runtime_error("Generated FormId can not be converted to 32bit format");
if (mContentFile > 0xfe)
throw std::runtime_error("FormId with mContentFile > 0xFE can not be converted to 32bit format");
return (mIndex & 0xffffff) | ((hasContentFile() ? mContentFile : 0xff) << 24);
}
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