Method impl

subprojects/llama.cpp/src/llama-mmap.cpp:78–87

    }

    impl(const char * fname, const char * mode, [[maybe_unused]] const bool use_direct_io = false) {
        fp = ggml_fopen(fname, mode);
        if (fp == NULL) {
            throw std::runtime_error(format("failed to open %s: %s", fname, strerror(errno)));
        }
        fp_win32 = (HANDLE) _get_osfhandle(_fileno(fp));
        seek(0, SEEK_END);
        size = tell();
        seek(0, SEEK_SET);
    }

    size_t tell() const {
        LARGE_INTEGER li;