~drizzle-trunk/drizzle/development : revision 173.1.2

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

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

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*

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*

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* This program is free software; you can redistribute it and/or modify

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* it under the terms of the GNU General Public License as published by

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* the Free Software Foundation; either version 2 of the License, or

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* (at your option) any later version.

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*

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* This program is distributed in the hope that it will be useful,

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* but WITHOUT ANY WARRANTY; without even the implied warranty of

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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

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* GNU General Public License for more details.

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*

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* You should have received a copy of the GNU General Public License

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* along with this program; if not, write to the Free Software

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

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*/

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#ifndef DRIZZLE_SERVER_FIELD_BLOB

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#define DRIZZLE_SERVER_FIELD_BLOB

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#include "mysql_priv.h"

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class Field_blob :public Field_longstr {

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protected:

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uint packlength;

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String value; // For temporaries

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public:

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Field_blob(uchar *ptr_arg, uchar *null_ptr_arg, uchar null_bit_arg,

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enum utype unireg_check_arg, const char *field_name_arg,

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TABLE_SHARE *share, uint blob_pack_length, CHARSET_INFO *cs);

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Field_blob(uint32_t len_arg,bool maybe_null_arg, const char *field_name_arg,

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CHARSET_INFO *cs)

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:Field_longstr((uchar*) 0, len_arg, maybe_null_arg ? (uchar*) "": 0, 0,

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NONE, field_name_arg, cs),

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packlength(4)

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{

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flags|= BLOB_FLAG;

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}

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Field_blob(uint32_t len_arg,bool maybe_null_arg, const char *field_name_arg,

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CHARSET_INFO *cs, bool set_packlength)

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:Field_longstr((uchar*) 0,len_arg, maybe_null_arg ? (uchar*) "": 0, 0,

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NONE, field_name_arg, cs)

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{

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flags|= BLOB_FLAG;

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packlength= 4;

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if (set_packlength)

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{

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uint32_t l_char_length= len_arg/cs->mbmaxlen;

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packlength= l_char_length <= 255 ? 1 :

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l_char_length <= 65535 ? 2 :

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l_char_length <= 16777215 ? 3 : 4;

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}

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}

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Field_blob(uint32_t packlength_arg)

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:Field_longstr((uchar*) 0, 0, (uchar*) "", 0, NONE, "temp", system_charset_info),

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packlength(packlength_arg) {}

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enum_field_types type() const { return MYSQL_TYPE_BLOB;}

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enum ha_base_keytype key_type() const

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{ return binary() ? HA_KEYTYPE_VARBINARY2 : HA_KEYTYPE_VARTEXT2; }

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

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int store(double nr);

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int store(int64_t nr, bool unsigned_val);

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double val_real(void);

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int64_t val_int(void);

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String *val_str(String*,String *);

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my_decimal *val_decimal(my_decimal *);

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int cmp_max(const uchar *, const uchar *, uint max_length);

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int cmp(const uchar *a,const uchar *b)

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{ return cmp_max(a, b, ~0L); }

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int cmp(const uchar *a, uint32_t a_length, const uchar *b, uint32_t b_length);

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int cmp_binary(const uchar *a,const uchar *b, uint32_t max_length=~0L);

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int key_cmp(const uchar *,const uchar*);

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int key_cmp(const uchar *str, uint length);

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uint32_t key_length() const { return 0; }

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void sort_string(uchar *buff,uint length);

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uint32_t pack_length() const

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{ return (uint32_t) (packlength+table->s->blob_ptr_size); }

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/**

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Return the packed length without the pointer size added.

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This is used to determine the size of the actual data in the row

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buffer.

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@returns The length of the raw data itself without the pointer.

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*/

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uint32_t pack_length_no_ptr() const

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{ return (uint32_t) (packlength); }

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uint row_pack_length() { return pack_length_no_ptr(); }

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uint32_t sort_length() const;

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virtual uint32_t max_data_length() const

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{

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return (uint32_t) (((uint64_t) 1 << (packlength*8)) -1);

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}

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int reset(void) { bzero(ptr, packlength+sizeof(uchar*)); return 0; }

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void reset_fields() { bzero((uchar*) &value,sizeof(value)); }

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#ifndef WORDS_BIGENDIAN

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static

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#endif

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void store_length(uchar *i_ptr, uint i_packlength, uint32_t i_number, bool low_byte_first);

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void store_length(uchar *i_ptr, uint i_packlength, uint32_t i_number)

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{

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store_length(i_ptr, i_packlength, i_number, table->s->db_low_byte_first);

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}

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inline void store_length(uint32_t number)

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{

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store_length(ptr, packlength, number);

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}

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/**

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Return the packed length plus the length of the data.

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This is used to determine the size of the data plus the

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packed length portion in the row data.

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@returns The length in the row plus the size of the data.

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*/

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uint32_t get_packed_size(const uchar *ptr_arg, bool low_byte_first)

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{return packlength + get_length(ptr_arg, packlength, low_byte_first);}

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inline uint32_t get_length(uint row_offset= 0)

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{ return get_length(ptr+row_offset, this->packlength, table->s->db_low_byte_first); }

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uint32_t get_length(const uchar *ptr, uint packlength, bool low_byte_first);

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uint32_t get_length(const uchar *ptr_arg)

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{ return get_length(ptr_arg, this->packlength, table->s->db_low_byte_first); }

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void put_length(uchar *pos, uint32_t length);

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inline void get_ptr(uchar **str)

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{

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memcpy_fixed((uchar*) str,ptr+packlength,sizeof(uchar*));

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}

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inline void get_ptr(uchar **str, uint row_offset)

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{

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memcpy_fixed((uchar*) str,ptr+packlength+row_offset,sizeof(char*));

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}

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inline void set_ptr(uchar *length, uchar *data)

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{

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memcpy(ptr,length,packlength);

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memcpy_fixed(ptr+packlength,&data,sizeof(char*));

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}

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void set_ptr_offset(my_ptrdiff_t ptr_diff, uint32_t length, uchar *data)

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{

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uchar *ptr_ofs= ADD_TO_PTR(ptr,ptr_diff,uchar*);

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store_length(ptr_ofs, packlength, length);

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memcpy_fixed(ptr_ofs+packlength,&data,sizeof(char*));

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}

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inline void set_ptr(uint32_t length, uchar *data)

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{

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set_ptr_offset(0, length, data);

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}

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uint get_key_image(uchar *buff,uint length, imagetype type);

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void set_key_image(const uchar *buff,uint length);

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void sql_type(String &str) const;

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inline bool copy()

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{

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uchar *tmp;

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get_ptr(&tmp);

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if (value.copy((char*) tmp, get_length(), charset()))

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{

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Field_blob::reset();

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return 1;

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}

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tmp=(uchar*) value.ptr();

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memcpy_fixed(ptr+packlength,&tmp,sizeof(char*));

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return 0;

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}

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virtual uchar *pack(uchar *to, const uchar *from,

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uint max_length, bool low_byte_first);

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uchar *pack_key(uchar *to, const uchar *from,

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uint max_length, bool low_byte_first);

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uchar *pack_key_from_key_image(uchar* to, const uchar *from,

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uint max_length, bool low_byte_first);

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virtual const uchar *unpack(uchar *to, const uchar *from,

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uint param_data, bool low_byte_first);

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const uchar *unpack_key(uchar* to, const uchar *from,

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uint max_length, bool low_byte_first);

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int pack_cmp(const uchar *a, const uchar *b, uint key_length,

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my_bool insert_or_update);

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int pack_cmp(const uchar *b, uint key_length,my_bool insert_or_update);

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uint packed_col_length(const uchar *col_ptr, uint length);

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uint max_packed_col_length(uint max_length);

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void free() { value.free(); }

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inline void clear_temporary() { bzero((uchar*) &value,sizeof(value)); }

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friend int field_conv(Field *to,Field *from);

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

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bool has_charset(void) const

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

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uint32_t max_display_length();

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uint is_equal(Create_field *new_field);

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inline bool in_read_set() { return bitmap_is_set(table->read_set, field_index); }

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inline bool in_write_set() { return bitmap_is_set(table->write_set, field_index); }

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private:

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int do_save_field_metadata(uchar *first_byte);

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};

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#endif

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