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OpenMW is an open implementation of the Morrowind engine
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1.4 kB · 40 lines
C++
1234567891011121314151617181920212223242526272829303132333435363738394041#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);}