/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

class Querycache_stream
{
  byte *cur_data;
  byte *data_end;
  Query_cache_block *block;
  uint headers_len;
public:
#ifndef DBUG_OFF
  uint stored_size;
#endif
  Querycache_stream(Query_cache_block *ini_block, uint ini_headers_len) :
    block(ini_block), headers_len(ini_headers_len)    
  {
    use_next_block();
#ifndef DBUG_OFF
    stored_size= 0;
#endif
  }
  void use_next_block()
  {
    cur_data= ((byte*)block)+headers_len;
    data_end= cur_data + (block->used-headers_len);
  }
  
  void store_char(char c);
  void store_short(ushort s);
  void store_int(uint i);
  void store_ll(ulonglong ll);
  void store_str_only(const char *str, uint str_len);
  void store_str(const char *str, uint str_len);
  void store_safe_str(const char *str, uint str_len);

  char load_char();
  ushort load_short();
  uint load_int();
  ulonglong load_ll();
  void load_str_only(char *buffer, uint str_len);
  char *load_str(MEM_ROOT *alloc, uint *str_len);
  int load_safe_str(MEM_ROOT *alloc, char **str, uint *str_len);
  int load_column(MEM_ROOT *alloc, char **column);
};

uint emb_count_querycache_size(THD *thd);
int emb_load_querycache_result(THD *thd, Querycache_stream *src);
void emb_store_querycache_result(Querycache_stream *dst, THD* thd);