New function prototype:

bson_iterator_init( bson_iterator *i, const bson *bson );

For pure bson buffers, adding this function:

bson_iterator_from_buffer( bson_iterator *i, const char *buffer );

To get the bson* from the cursor:

const bson *mongo_cursor_bson( mongo_cursor *cursor );

To get the raw buffers from either cursor or bson objects:

const char *mongo_cursor_data( mongo_cursor *cursor );
const char *bson_data( bson *b );