Method underflow

src/Abyss/FileSystem/CASC.cpp:41–54

CASCStream::~CASCStream() { CascCloseFile(_file); }

int CASCStream::underflow() {
    if (gptr() == egptr()) {
        _startOfBlock += egptr() - eback();
        DWORD amountRead;
        if (!CascReadFile(_file, _buffer, sizeof(_buffer), &amountRead)) {
            if (GetCascError() != ERROR_HANDLE_EOF) {
                throw std::runtime_error("Error reading file from CASC");
            }
        }
        setg(_buffer, _buffer, _buffer + amountRead);
    }

    return gptr() == egptr() ? traits_type::eof() : traits_type::to_int_type(*gptr());
}

CASCStream::pos_type CASCStream::seekpos(pos_type pos, std::ios_base::openmode which) { return seekoff(pos, std::ios_base::beg, which); }