Re: luaL_loadstring error with dumped chunk

[Philipp Kraus <philipp.kraus@...>]

Am 10.10.2014 um 08:23 schrieb Sean Conner <sean@conman.org>:

> It was thus said that the Great Philipp Kraus once stated:
>> 
>> In my main I do something like
>> 
>> CInterpreter x("function abcd() print(‚test') end“)
>> CInterpreter y(x.m_binaryscript) <- This line creates the truncated chunk error
>> 
>> IMHO luaL_loadstring adds the compiled script on the stack top, my Lua
>> dump function adds the full data into a std::string, because on a
>> std::string the chunk is ended with \0 (I have tested the call with change
>> the std::string to std::vector<char> but I get equal errors). The
>> lua_pcall runs the script, which is on the stack top, so I don’t see my
>> mistake at the moment why the chunk with should be stored in the
>> std::string is incomplete.
>> 
>> Can anybody help me to create a correct dumping process?
> 
>  One question, not knowing C++, but what happens when you call
> (p_target)->append() with a string with embedded NUL bytes (and not just a
> NUL character ('\0') at the end)?  From your problem, it seems like append()
> will stop appending when it sees p_size non-NUL characters, or at the first
> NUL character.
> 
>  -spc (lua_dump() produces binary data … )

Thanks for this hint, I have tested the code with a std::vector<char> also, so on this I add the Lua
dump data into the vector, but this does not work. I get the same error message.
My Code with the std::vector<char> shows:

int CInterpreter::dump( lua_State* p_interpreter, const void* p_source, std::size_t p_size, void* p_target )
{
    std::vector<char>* l_target    = static_cast< std::vector<char>* >(p_target);
    const std::size_t l_beginindex = l_target->size();
    try {
        l_target->resize(l_beginindex + p_size);
        memcpy( &((*l_target)[l_beginindex]), p_source, p_size );

    } catch (...) {
        return 1;
    }
    return 0;
}


And the Dump-Load-Call is: luaL_loadstring(m_interpreter, &m_binaryscript[0])
with m_binaryscript = std::vector<char>

IMHO it seems, that I don’t add the correct data into my vector. I have sum the p_size variable
and the vector or string has got equal number of elements. 

Phil


-----------------------------------------------------
Dipl.-Inf. Philipp Kraus
Clausthal University of Technology
Department of Informatics
Julius-Albert-Str. 4, Room 211
D-38678 Clausthal-Zellerfeld

Phone: +49 - 5323 / 72-7109
EMail: philipp.kraus@tu-clausthal.de