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Issue with loading Union related archives #52

Description

@Try

More FYI, rather than actual issues. When OpenGothic load *.vdf from file system, game crashes with exception:

 for(auto& i:archives)
    inst->gothicAssets.merge(phoenix::vdf_file::open(i.name), false); // buffer_underflow here

Callstack:

0x00007ff67c54ed76: dbg::call_stack<64u>::collect(unsigned int) in C:\Users\mrsta\Downloads\opengothic_win\Gothic2Notr.exe
0x00007ff67c3cf1dc: CrashLog::dumpStack(char const*) in C:\Users\mrsta\Downloads\opengothic_win\Gothic2Notr.exe
0x00007ff67c3cf738: terminateHandler() in C:\Users\mrsta\Downloads\opengothic_win\Gothic2Notr.exe
0x00007fff739263f6: ZN10__cxxabiv111__terminateEPFvvE in C:\Users\mrsta\Downloads\opengothic_win\libstdc++-6.dll
0x00007fff73a22d43: ZSt9terminatev in C:\Users\mrsta\Downloads\opengothic_win\libstdc++-6.dll
0x00007fff73a2bf56: _cxa_throw in C:\Users\mrsta\Downloads\opengothic_win\libstdc++-6.dll
0x00007ff67c430819: phoenix::buffer::slice(unsigned long long, unsigned long long) const in C:\Users\mrsta\Downloads\opengothic_win\Gothic2Notr.exe
0x00007ff67c47a368: phoenix::vdf_entry::read(phoenix::buffer&, unsigned int) in C:\Users\mrsta\Downloads\opengothic_win\Gothic2Notr.exe
0x00007ff67c47aa5b: phoenix::vdf_file::open(phoenix::buffer&) in C:\Users\mrsta\Downloads\opengothic_win\Gothic2Notr.exe
0x00007ff67c47ac87: phoenix::vdf_file::open(std::filesystem::__cxx11::path const&) in C:\Users\mrsta\Downloads\opengothic_win\Gothic2Notr.exe
0x00007ff67c3b7c39: Resources::loadVdfs(std::vector<std::__cxx11::basic_string<char16_t, std::char_traits<char16_t>, std::allocator<char16_t> >, std::allocator<std::__cxx11::basic_string<char16_t, std::char_traits<char16_t>, std::allocator<char16_t> > > > const&) in C:\Users\mrsta\Downloads\opengothic_win\Gothic2Notr.exe

I've added simple try-catch handler to workaround issue, so here is the list of files that are failed to load:

unable to load archive: "D:/Games/Gothic II/Data/$Templates$/asmcl.dll"
unable to load archive: "D:/Games/Gothic II/Data/Union.vdf"
unable to load archive: "D:/Games/Gothic II/Data/$Templates$/ZUNIONUTILS.DLL"
unable to load archive: "D:/Games/Gothic II/Data/$Templates$/ZBINKFIX.DLL"
unable to load archive: "D:/Games/Gothic II/Data/$Templates$/ZMOUSEFIX.DLL"

Proposed change:
Can you add new dedicated type of exception, if *.vdf file signature does not match VDF_SIGNATURE_G* ?
Thanks!

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