mariadb/sql/protocol.h

/*
   Copyright (c) 2002-2007 MySQL AB, 2009 Sun Microsystems, Inc.
   Use is subject to license terms.

   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; version 2 of the License.

   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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/

#ifdef USE_PRAGMA_INTERFACE
#pragma interface			/* gcc class implementation */
#endif


class i_string;
class THD;
typedef struct st_mysql_field MYSQL_FIELD;
typedef struct st_mysql_rows MYSQL_ROWS;

class Protocol
{
protected:
  THD	 *thd;
  String *packet;
  /* Used by net_store_data() for charset conversions */
  String *convert;
  uint field_pos;
#ifndef DBUG_OFF
  enum enum_field_types *field_types;
#endif
  uint field_count;
#ifndef EMBEDDED_LIBRARY
  bool net_store_data(const uchar *from, size_t length);
#else
  virtual bool net_store_data(const uchar *from, size_t length);
  char **next_field;
  MYSQL_FIELD *next_mysql_field;
  MEM_ROOT *alloc;
#endif
  /* 
    The following two are low-level functions that are invoked from
    higher-level store_xxx() funcs.  The data is stored into this->packet.
  */
  bool net_store_data(const uchar *from, size_t length,
                      CHARSET_INFO *fromcs, CHARSET_INFO *tocs);
  bool store_string_aux(const char *from, size_t length,
                        CHARSET_INFO *fromcs, CHARSET_INFO *tocs);
public:
  Protocol() {}
  Protocol(THD *thd_arg) { init(thd_arg); }
  virtual ~Protocol() {}
  void init(THD* thd_arg);

  enum { SEND_NUM_ROWS= 1, SEND_DEFAULTS= 2, SEND_EOF= 4 };
  virtual bool send_fields(List<Item> *list, uint flags);

  void get_packet(const char **start, size_t *length) 
  {
    *start= packet->ptr();
    *length= packet->length(); 
  }
  void set_packet(const char *start, size_t len)
  {
    packet->length(0);
    packet->append(start, len);
#ifndef DBUG_OFF
  field_pos= field_count - 1;
#endif
  }

  bool store(I_List<i_string> *str_list);
  bool store(const char *from, CHARSET_INFO *cs);
  String *storage_packet() { return packet; }
  inline void free() { packet->free(); }
  virtual bool write();
  inline  bool store(int from)
  { return store_long((longlong) from); }
  inline  bool store(uint32 from)
  { return store_long((longlong) from); }
  inline  bool store(longlong from)
  { return store_longlong((longlong) from, 0); }
  inline  bool store(ulonglong from)
  { return store_longlong((longlong) from, 1); }
  inline bool store(String *str)
  { return store((char*) str->ptr(), str->length(), str->charset()); }

  virtual bool prepare_for_send(List<Item> *item_list) 
  {
    field_count=item_list->elements;
    return 0;
  }
  virtual bool flush();
  virtual void end_partial_result_set(THD *thd);
  virtual void prepare_for_resend()=0;

  virtual bool store_null()=0;
  virtual bool store_tiny(longlong from)=0;
  virtual bool store_short(longlong from)=0;
  virtual bool store_long(longlong from)=0;
  virtual bool store_longlong(longlong from, bool unsigned_flag)=0;
  virtual bool store_decimal(const my_decimal *)=0;
  virtual bool store(const char *from, size_t length, CHARSET_INFO *cs)=0;
  virtual bool store(const char *from, size_t length, 
  		     CHARSET_INFO *fromcs, CHARSET_INFO *tocs)=0;
  virtual bool store(float from, uint32 decimals, String *buffer)=0;
  virtual bool store(double from, uint32 decimals, String *buffer)=0;
  virtual bool store(MYSQL_TIME *time, int decimals)=0;
  virtual bool store_date(MYSQL_TIME *time)=0;
  virtual bool store_time(MYSQL_TIME *time, int decimals)=0;
  virtual bool store(Field *field)=0;
#ifdef EMBEDDED_LIBRARY
  int begin_dataset();
  virtual void remove_last_row() {}
#else
  void remove_last_row() {}
#endif
  enum enum_protocol_type
  {
    PROTOCOL_TEXT= 0, PROTOCOL_BINARY= 1
    /*
      before adding here or change the values, consider that it is cast to a
      bit in sql_cache.cc.
    */
  };
  virtual enum enum_protocol_type type()= 0;
};


/** Class used for the old (MySQL 4.0 protocol). */

class Protocol_text :public Protocol
{
public:
  Protocol_text() {}
  Protocol_text(THD *thd_arg) :Protocol(thd_arg) {}
  virtual void prepare_for_resend();
  virtual bool store_null();
  virtual bool store_tiny(longlong from);
  virtual bool store_short(longlong from);
  virtual bool store_long(longlong from);
  virtual bool store_longlong(longlong from, bool unsigned_flag);
  virtual bool store_decimal(const my_decimal *);
  virtual bool store(const char *from, size_t length, CHARSET_INFO *cs);
  virtual bool store(const char *from, size_t length,
  		     CHARSET_INFO *fromcs, CHARSET_INFO *tocs);
  virtual bool store(MYSQL_TIME *time, int decimals);
  virtual bool store_date(MYSQL_TIME *time);
  virtual bool store_time(MYSQL_TIME *time, int decimals);
  virtual bool store(float nr, uint32 decimals, String *buffer);
  virtual bool store(double from, uint32 decimals, String *buffer);
  virtual bool store(Field *field);
#ifdef EMBEDDED_LIBRARY
  void remove_last_row();
#endif
  virtual enum enum_protocol_type type() { return PROTOCOL_TEXT; };
};


class Protocol_binary :public Protocol
{
private:
  uint bit_fields;
public:
  Protocol_binary() {}
  Protocol_binary(THD *thd_arg) :Protocol(thd_arg) {}
  virtual bool prepare_for_send(List<Item> *item_list);
  virtual void prepare_for_resend();
#ifdef EMBEDDED_LIBRARY
  virtual bool write();
  bool net_store_data(const uchar *from, size_t length);
#endif
  virtual bool store_null();
  virtual bool store_tiny(longlong from);
  virtual bool store_short(longlong from);
  virtual bool store_long(longlong from);
  virtual bool store_longlong(longlong from, bool unsigned_flag);
  virtual bool store_decimal(const my_decimal *);
  virtual bool store(const char *from, size_t length, CHARSET_INFO *cs);
  virtual bool store(const char *from, size_t length,
  		     CHARSET_INFO *fromcs, CHARSET_INFO *tocs);
  virtual bool store(MYSQL_TIME *time, int decimals);
  virtual bool store_date(MYSQL_TIME *time);
  virtual bool store_time(MYSQL_TIME *time, int decimals);
  virtual bool store(float nr, uint32 decimals, String *buffer);
  virtual bool store(double from, uint32 decimals, String *buffer);
  virtual bool store(Field *field);
  virtual enum enum_protocol_type type() { return PROTOCOL_BINARY; };
};

void send_warning(THD *thd, uint sql_errno, const char *err=0);
bool net_send_error(THD *thd, uint sql_errno=0, const char *err=0);
void net_end_statement(THD *thd);
void net_send_progress_packet(THD *thd);
uchar *net_store_data(uchar *to,const uchar *from, size_t length);
uchar *net_store_data(uchar *to,int32 from);
uchar *net_store_data(uchar *to,longlong from);