~drizzle-trunk/drizzle/development

/* - mode: c++ c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 *  Copyright (C) 2008 MySQL

 *

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

 */

#ifndef DRIZZLE_SERVER_FIELD_VARSTRING

#define DRIZZLE_SERVER_FIELD_VARSTRING

#include <drizzled/field/longstr.h>

#include <string>

class Field_varstring :public Field_longstr {

public:

  using Field::store;

  using Field::pack;

  using Field::unpack;

  using Field::val_int;

  using Field::val_str;

  /*

    The maximum space available in a Field_varstring, in bytes. See

    length_bytes.

  */

  static const uint32_t MAX_SIZE;

  /* Store number of bytes used to store length (1 or 2) */

  uint32_t length_bytes;

  Field_varstring(unsigned char *ptr_arg,

                  uint32_t len_arg, uint32_t length_bytes_arg,

                  unsigned char *null_ptr_arg, unsigned char null_bit_arg,

                  enum utype unireg_check_arg, const char *field_name_arg,

                  TABLE_SHARE *share, const CHARSET_INFO * const cs);

  Field_varstring(uint32_t len_arg,bool maybe_null_arg,

                  const char *field_name_arg,

                  TABLE_SHARE *share, const CHARSET_INFO * const cs);

  enum_field_types type() const { return DRIZZLE_TYPE_VARCHAR; }

  enum ha_base_keytype key_type() const;

  uint32_t row_pack_length() { return field_length; }

  bool zero_pack() const { return 0; }

  int  reset(void) { memset(ptr, 0, field_length+length_bytes); return 0; }

  uint32_t pack_length() const { return (uint32_t) field_length+length_bytes; }

  uint32_t key_length() const { return (uint32_t) field_length; }

  uint32_t sort_length() const

  {

    return (uint32_t) field_length + (field_charset == &my_charset_bin ?

                                    length_bytes : 0);

  }

  int  store(const char *to,uint32_t length, const CHARSET_INFO * const charset);

  int  store(int64_t nr, bool unsigned_val);

  int  store(double nr) { return Field_str::store(nr); } /* QQ: To be deleted */

  double val_real(void);

  int64_t val_int(void);

  String *val_str(String*,String *);

  inline String *val_str(String *str) { return val_str(str, str); }

  my_decimal *val_decimal(my_decimal *);

  int cmp_max(const unsigned char *, const unsigned char *, uint32_t max_length);

  inline  int cmp(const unsigned char *str) { return cmp(ptr,str); }

  int cmp(const unsigned char *a,const unsigned char *b)

  {

    return cmp_max(a, b, UINT32_MAX);

  }

  void sort_string(unsigned char *buff,uint32_t length);

  uint32_t get_key_image(unsigned char *buff,uint32_t length, imagetype type);

  uint32_t get_key_image(std::basic_string <unsigned char> &buff,

                         uint32_t length, imagetype type);

  void set_key_image(const unsigned char *buff,uint32_t length);

  void sql_type(String &str) const;

  virtual unsigned char *pack(unsigned char *to, const unsigned char *from,

                              uint32_t max_length,

                              bool low_byte_first);

  unsigned char *pack_key(unsigned char *to, const unsigned char *from, uint32_t max_length, bool low_byte_first);

  unsigned char *pack_key_from_key_image(unsigned char* to, const unsigned char *from,

                                 uint32_t max_length, bool low_byte_first);

  virtual const unsigned char *unpack(unsigned char* to,

                                      const unsigned char *from,

                                      uint32_t param_data,

                                      bool low_byte_first);

  const unsigned char *unpack_key(unsigned char* to, const unsigned char *from,

                          uint32_t max_length, bool low_byte_first);

  int pack_cmp(const unsigned char *a, const unsigned char *b, uint32_t key_length,

               bool insert_or_update);

  int pack_cmp(const unsigned char *b, uint32_t key_length,bool insert_or_update);

  int cmp_binary(const unsigned char *a,const unsigned char *b, uint32_t max_length=UINT32_MAX);

  int key_cmp(const unsigned char *,const unsigned char*);

  int key_cmp(const unsigned char *str, uint32_t length);

  uint32_t packed_col_length(const unsigned char *to, uint32_t length);

  uint32_t max_packed_col_length(uint32_t max_length);

  uint32_t data_length();

  uint32_t used_length();

  uint32_t size_of() const { return sizeof(*this); }

  enum_field_types real_type() const { return DRIZZLE_TYPE_VARCHAR; }

  bool has_charset(void) const

  { return charset() == &my_charset_bin ? false : true; }

  Field *new_field(MEM_ROOT *root, Table *new_table, bool keep_type);

  Field *new_key_field(MEM_ROOT *root, Table *new_table,

                       unsigned char *new_ptr, unsigned char *new_null_ptr,

                       uint32_t new_null_bit);

  uint32_t is_equal(Create_field *new_field);

  void hash(uint32_t *nr, uint32_t *nr2);

private:

  int do_save_field_metadata(unsigned char *first_byte);

};

#endif