Method setup_writing

sql/sql_lifo_buffer.h:95–99

Specify where write() should get the source data from, as well as source data size. */

    data size.
  */
  void setup_writing(size_t len1, size_t len2)
  {
    size1= len1;
    size2= len2;
  }

  /** 
    Specify where read() should store pointers to read data, as well as read