Cpp Stream Chunk Reader

// this is not threadsafe

const char* istream_ChunkReader( lua_State *L, void *data, size_t *size )

{

    const size_t kBufferSize = 1024;

    static char s_buffer[kBufferSize];



    std::istream* pis = reinterpret_cast<std::istream*>(data);

    if ( !pis )

        return NULL;

    pis->read( &s_buffer[0], kBufferSize );

    *size = pis->gcount();

    return s_buffer;

}



// type-safe wrapper

int lua_load_stream( lua_State *L, std::istream& is, const std::string& chunkname = "" )

{

    return lua_load( L, &istream_ChunkReader, &is,

                     chunkname.empty() ? NULL : chunkname.c_str() );

}



// it would be invoked like so:

lua_State* L = some_lua_state;

std::istream& is = some_stream_from_somewhere;

int res = lua_load_stream( L, is, "my chunk name" );