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/* - 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_BLOB
#define DRIZZLE_SERVER_FIELD_BLOB
#include <drizzled/field/longstr.h>
class Field_blob :public Field_longstr {
protected:
uint32_t packlength;
String value; // For temporaries
public:
Field_blob(unsigned char *ptr_arg, unsigned char *null_ptr_arg, unsigned char null_bit_arg,
enum utype unireg_check_arg, const char *field_name_arg,
TABLE_SHARE *share, uint32_t blob_pack_length, const CHARSET_INFO * const cs);
Field_blob(uint32_t len_arg, bool maybe_null_arg, const char *field_name_arg,
const CHARSET_INFO * const cs)
:Field_longstr((unsigned char*) 0, len_arg, maybe_null_arg ? (unsigned char*) "": 0, 0,
NONE, field_name_arg, cs),
packlength(4)
{
flags|= BLOB_FLAG;
}
Field_blob(uint32_t len_arg, bool maybe_null_arg, const char *field_name_arg,
const CHARSET_INFO * const cs, bool set_packlength)
:Field_longstr((unsigned char*) 0,len_arg, maybe_null_arg ? (unsigned char*) "": 0, 0,
NONE, field_name_arg, cs)
{
flags|= BLOB_FLAG;
packlength= 4;
if (set_packlength)
{
uint32_t l_char_length= len_arg/cs->mbmaxlen;
packlength= l_char_length <= 255 ? 1 :
l_char_length <= 65535 ? 2 :
l_char_length <= 16777215 ? 3 : 4;
}
}
Field_blob(uint32_t packlength_arg)
:Field_longstr((unsigned char*) 0, 0, (unsigned char*) "", 0, NONE, "temp", system_charset_info),
packlength(packlength_arg) {}
enum_field_types type() const { return DRIZZLE_TYPE_BLOB;}
enum ha_base_keytype key_type() const
{ return binary() ? HA_KEYTYPE_VARBINARY2 : HA_KEYTYPE_VARTEXT2; }
int store(const char *to,uint32_t length, const CHARSET_INFO * const charset);
int store(double nr);
int store(int64_t nr, bool unsigned_val);
double val_real(void);
int64_t val_int(void);
String *val_str(String*,String *);
my_decimal *val_decimal(my_decimal *);
int cmp_max(const unsigned char *, const unsigned char *, uint32_t max_length);
int cmp(const unsigned char *a,const unsigned char *b)
{ return cmp_max(a, b, UINT32_MAX); }
int cmp(const unsigned char *a, uint32_t a_length, const unsigned char *b, uint32_t b_length);
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 key_length() const { return 0; }
void sort_string(unsigned char *buff,uint32_t length);
uint32_t pack_length() const;
/**
Return the packed length without the pointer size added.
This is used to determine the size of the actual data in the row
buffer.
@returns The length of the raw data itself without the pointer.
*/
uint32_t pack_length_no_ptr() const
{ return (uint32_t) (packlength); }
uint32_t row_pack_length() { return pack_length_no_ptr(); }
uint32_t sort_length() const;
virtual uint32_t max_data_length() const
{
return (uint32_t) (((uint64_t) 1 << (packlength*8)) -1);
}
int reset(void) { memset(ptr, 0, packlength+sizeof(unsigned char*)); return 0; }
void reset_fields() { memset(&value, 0, sizeof(value)); }
#ifndef WORDS_BIGENDIAN
static
#endif
void store_length(unsigned char *i_ptr, uint32_t i_packlength,
uint32_t i_number, bool low_byte_first);
void store_length(unsigned char *i_ptr, uint32_t i_packlength,
uint32_t i_number);
inline void store_length(uint32_t number)
{
store_length(ptr, packlength, number);
}
/**
Return the packed length plus the length of the data.
This is used to determine the size of the data plus the
packed length portion in the row data.
@returns The length in the row plus the size of the data.
*/
uint32_t get_packed_size(const unsigned char *ptr_arg, bool low_byte_first);
uint32_t get_length(uint32_t row_offset= 0);
uint32_t get_length(const unsigned char *ptr, uint32_t packlength,
bool low_byte_first);
uint32_t get_length(const unsigned char *ptr_arg);
void put_length(unsigned char *pos, uint32_t length);
inline void get_ptr(unsigned char **str)
{
memcpy(str,ptr+packlength,sizeof(unsigned char*));
}
inline void get_ptr(unsigned char **str, uint32_t row_offset)
{
memcpy(str,ptr+packlength+row_offset,sizeof(char*));
}
inline void set_ptr(unsigned char *length, unsigned char *data)
{
memcpy(ptr,length,packlength);
memcpy(ptr+packlength,&data,sizeof(char*));
}
void set_ptr_offset(my_ptrdiff_t ptr_diff, uint32_t length, unsigned char *data)
{
unsigned char *ptr_ofs= ADD_TO_PTR(ptr,ptr_diff,unsigned char*);
store_length(ptr_ofs, packlength, length);
memcpy(ptr_ofs+packlength,&data,sizeof(char*));
}
inline void set_ptr(uint32_t length, unsigned char *data)
{
set_ptr_offset(0, length, data);
}
uint32_t get_key_image(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;
inline bool copy()
{
unsigned char *tmp;
get_ptr(&tmp);
if (value.copy((char*) tmp, get_length(), charset()))
{
Field_blob::reset();
return 1;
}
tmp=(unsigned char*) value.ptr();
memcpy(ptr+packlength,&tmp,sizeof(char*));
return 0;
}
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);
uint32_t packed_col_length(const unsigned char *col_ptr, uint32_t length);
uint32_t max_packed_col_length(uint32_t max_length);
void free() { value.free(); }
inline void clear_temporary() { memset(&value, 0, sizeof(value)); }
friend int field_conv(Field *to,Field *from);
uint32_t size_of() const { return sizeof(*this); }
bool has_charset(void) const
{ return charset() == &my_charset_bin ? false : true; }
uint32_t max_display_length();
uint32_t is_equal(Create_field *new_field);
bool in_read_set();
bool in_write_set();
private:
int do_save_field_metadata(unsigned char *first_byte);
};
#endif
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