Function ReadVarUInt64

library/cpp/yson/varint.cpp:35–53

    }

    int ReadVarUInt64(IInputStream* input, ui64* value) {
        size_t count = 0;
        ui64 result = 0;

        ui8 byte = 0;
        do {
            if (7 * count > 8 * sizeof(ui64)) {
                ythrow yexception() << "The data is too long to read ui64";
            }
            if (input->Read(&byte, 1) != 1) {
                ythrow yexception() << "The data is too short to read ui64";
            }
            result |= (static_cast<ui64>(byte & 0x7F)) << (7 * count);
            ++count;
        } while (byte & 0x80);

        *value = result;
        return count;
    }

    int ReadVarInt32(IInputStream* input, i32* value) {
        ui64 varInt;