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- /* Copyright (c) 2003, 2021, Oracle and/or its affiliates.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License, version 2.0,
- as published by the Free Software Foundation.
-
- This program is also distributed with certain software (including
- but not limited to OpenSSL) that is licensed under separate terms,
- as designated in a particular file or component or in included license
- documentation. The authors of MySQL hereby grant you an additional
- permission to link the program and your derivative works with the
- separately licensed software that they have included with MySQL.
-
- 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, version 2.0, 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
-
- #include "sql_cache.h" /* Query_cache_block */
-
- class Querycache_stream
- {
- uchar *cur_data;
- uchar *data_end;
- Query_cache_block *block;
- uint headers_len;
- public:
- #ifndef NDEBUG
- Query_cache_block *first_block;
- size_t stored_size;
- #endif
- Querycache_stream(Query_cache_block *ini_block, uint ini_headers_len) :
- block(ini_block), headers_len(ini_headers_len)
- {
- cur_data= ((uchar*)block)+headers_len;
- data_end= cur_data + (block->used-headers_len);
- #ifndef NDEBUG
- first_block= ini_block;
- stored_size= 0;
- #endif
- }
- void use_next_block(bool writing)
- {
- /*
- This shouldn't be called if there is only one block, or to loop
- around to the first block again. That means we're trying to write
- more data than we allocated space for.
- */
- assert(block->next != block);
- assert(block->next != first_block);
-
- block= block->next;
- /*
- While writing, update the type of each block as we write to it.
- While reading, make sure that the block is of the expected type.
- */
- if (writing)
- block->type= Query_cache_block::RES_CONT;
- else
- assert(block->type == Query_cache_block::RES_CONT);
-
- cur_data= ((uchar*)block)+headers_len;
- data_end= cur_data + (block->used-headers_len);
- }
-
- void store_uchar(uchar c);
- void store_short(ushort s);
- void store_int(uint i);
- void store_ll(ulonglong ll);
- void store_str_only(const char *str, size_t str_len);
- void store_str(const char *str, size_t str_len);
- void store_safe_str(const char *str, size_t str_len);
-
- uchar load_uchar();
- ushort load_short();
- uint load_int();
- ulonglong load_ll();
- void load_str_only(char *buffer, size_t 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);
- bool net_send_eof(THD *thd, uint server_status, uint total_warn_count);
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