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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
*/
#pragma once
#include <drizzled/field/str.h>
#include <drizzled/charset.h>
#include <string>
#include <drizzled/visibility.h>
namespace drizzled {
/**
* Class representing a BLOB data type column
*/
class DRIZZLED_API Field_blob :
public Field_str
{
protected:
String value; // For temporaries
public:
using Field::store;
using Field::cmp;
using Field::pack;
using Field::unpack;
using Field::val_int;
using Field::val_str;
Field_blob(unsigned char *ptr_arg,
unsigned char *null_ptr_arg,
unsigned char null_bit_arg,
const char *field_name_arg,
TableShare *share,
const charset_info_st * const cs);
Field_blob(uint32_t len_arg,
bool maybe_null_arg,
const char *field_name_arg,
const charset_info_st * const cs)
:Field_str((unsigned char*) NULL,
len_arg,
maybe_null_arg ? (unsigned char *) "": 0,
0,
field_name_arg,
cs)
{
flags|= BLOB_FLAG;
}
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_st * const charset);
int store(double nr);
int store(int64_t nr, bool unsigned_val);
double val_real(void) const;
int64_t val_int(void) const;
String *val_str(String*,String *) const;
type::Decimal *val_decimal(type::Decimal *) const;
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) (sizeof(uint32_t)); }
uint32_t sort_length() const;
virtual uint32_t max_data_length() const
{
return (uint32_t) (((uint64_t) 1 << 32) -1);
}
int reset(void) { memset(ptr, 0, sizeof(uint32_t)+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_number, bool low_byte_first);
void store_length(unsigned char *i_ptr, uint32_t i_number);
inline void store_length(uint32_t number)
{
store_length(ptr, 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);
DRIZZLED_API uint32_t get_length(uint32_t row_offset= 0) const;
DRIZZLED_API uint32_t get_length(const unsigned char *ptr, bool low_byte_first) const;
DRIZZLED_API uint32_t get_length(const unsigned char *ptr_arg) const;
void put_length(unsigned char *pos, uint32_t length);
inline unsigned char* get_ptr() const
{
unsigned char* str;
memcpy(&str, ptr + sizeof(uint32_t), sizeof(unsigned char*));
return str;
}
inline void set_ptr(unsigned char *length, unsigned char *data)
{
memcpy(ptr,length,sizeof(uint32_t));
memcpy(ptr+sizeof(uint32_t),&data,sizeof(char*));
}
void set_ptr_offset(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, length);
memcpy(ptr_ofs+sizeof(uint32_t),&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);
uint32_t get_key_image(std::basic_string<unsigned char> &buff, uint32_t length);
void set_key_image(const unsigned char *buff,uint32_t length);
inline void copy()
{
value.copy((char*)get_ptr(), get_length(), charset());
char* tmp= value.ptr();
memcpy(ptr + sizeof(uint32_t), &tmp, sizeof(char*));
}
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);
virtual const unsigned char *unpack(unsigned char *to, const unsigned char *from, uint32_t , bool low_byte_first);
void free() { value.free(); }
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; }
uint32_t max_display_length();
};
} /* namespace drizzled */
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