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00020
00021 #pragma once
00022
00023 #include <drizzled/field/str.h>
00024
00025 #include <drizzled/global_charset_info.h>
00026
00027 #include <string>
00028
00029 #include <drizzled/visibility.h>
00030
00031 namespace drizzled
00032 {
00033
00037 class DRIZZLED_API Field_blob :
00038 public Field_str
00039 {
00040 protected:
00041 String value;
00042 public:
00043
00044 using Field::store;
00045 using Field::cmp;
00046 using Field::pack;
00047 using Field::unpack;
00048 using Field::val_int;
00049 using Field::val_str;
00050
00051 Field_blob(unsigned char *ptr_arg,
00052 unsigned char *null_ptr_arg,
00053 unsigned char null_bit_arg,
00054 const char *field_name_arg,
00055 TableShare *share,
00056 const CHARSET_INFO * const cs);
00057 Field_blob(uint32_t len_arg,
00058 bool maybe_null_arg,
00059 const char *field_name_arg,
00060 const CHARSET_INFO * const cs)
00061 :Field_str((unsigned char*) NULL,
00062 len_arg,
00063 maybe_null_arg ? (unsigned char *) "": 0,
00064 0,
00065 field_name_arg,
00066 cs)
00067 {
00068 flags|= BLOB_FLAG;
00069 }
00070
00071 enum_field_types type() const { return DRIZZLE_TYPE_BLOB;}
00072 enum ha_base_keytype key_type() const
00073 { return binary() ? HA_KEYTYPE_VARBINARY2 : HA_KEYTYPE_VARTEXT2; }
00074 int store(const char *to,uint32_t length,
00075 const CHARSET_INFO * const charset);
00076 int store(double nr);
00077 int store(int64_t nr, bool unsigned_val);
00078
00079 double val_real(void) const;
00080 int64_t val_int(void) const;
00081 String *val_str(String*,String *) const;
00082 type::Decimal *val_decimal(type::Decimal *) const;
00083 int cmp_max(const unsigned char *, const unsigned char *, uint32_t max_length);
00084 int cmp(const unsigned char *a,const unsigned char *b)
00085 { return cmp_max(a, b, UINT32_MAX); }
00086 int cmp(const unsigned char *a, uint32_t a_length, const unsigned char *b, uint32_t b_length);
00087 int cmp_binary(const unsigned char *a,const unsigned char *b, uint32_t max_length=UINT32_MAX);
00088 int key_cmp(const unsigned char *,const unsigned char*);
00089 int key_cmp(const unsigned char *str, uint32_t length);
00090 uint32_t key_length() const { return 0; }
00091 void sort_string(unsigned char *buff,uint32_t length);
00092 uint32_t pack_length() const;
00093
00094
00103 uint32_t pack_length_no_ptr() const
00104 { return (uint32_t) (sizeof(uint32_t)); }
00105
00106 uint32_t sort_length() const;
00107 virtual uint32_t max_data_length() const
00108 {
00109 return (uint32_t) (((uint64_t) 1 << 32) -1);
00110 }
00111 int reset(void) { memset(ptr, 0, sizeof(uint32_t)+sizeof(unsigned char*)); return 0; }
00112 void reset_fields() { memset(&value, 0, sizeof(value)); }
00113 #ifndef WORDS_BIGENDIAN
00114 static
00115 #endif
00116 void store_length(unsigned char *i_ptr, uint32_t i_number, bool low_byte_first);
00117 void store_length(unsigned char *i_ptr, uint32_t i_number);
00118
00119 inline void store_length(uint32_t number)
00120 {
00121 store_length(ptr, number);
00122 }
00123
00132 uint32_t get_packed_size(const unsigned char *ptr_arg, bool low_byte_first);
00133
00134 DRIZZLED_API uint32_t get_length(uint32_t row_offset= 0) const;
00135 DRIZZLED_API uint32_t get_length(const unsigned char *ptr, bool low_byte_first) const;
00136 DRIZZLED_API uint32_t get_length(const unsigned char *ptr_arg) const;
00137 void put_length(unsigned char *pos, uint32_t length);
00138 inline void get_ptr(unsigned char **str)
00139 {
00140 memcpy(str,ptr+sizeof(uint32_t),sizeof(unsigned char*));
00141 }
00142 inline void get_ptr(unsigned char **str, uint32_t row_offset)
00143 {
00144 memcpy(str,ptr+sizeof(uint32_t)+row_offset,sizeof(char*));
00145 }
00146 inline void set_ptr(unsigned char *length, unsigned char *data)
00147 {
00148 memcpy(ptr,length,sizeof(uint32_t));
00149 memcpy(ptr+sizeof(uint32_t),&data,sizeof(char*));
00150 }
00151 void set_ptr_offset(ptrdiff_t ptr_diff, uint32_t length, unsigned char *data)
00152 {
00153 unsigned char *ptr_ofs= ADD_TO_PTR(ptr,ptr_diff,unsigned char*);
00154 store_length(ptr_ofs, length);
00155 memcpy(ptr_ofs+sizeof(uint32_t),&data,sizeof(char*));
00156 }
00157 inline void set_ptr(uint32_t length, unsigned char *data)
00158 {
00159 set_ptr_offset(0, length, data);
00160 }
00161 uint32_t get_key_image(unsigned char *buff,uint32_t length);
00162 uint32_t get_key_image(std::basic_string<unsigned char> &buff, uint32_t length);
00163 void set_key_image(const unsigned char *buff,uint32_t length);
00164 void sql_type(String &str) const;
00165 inline bool copy()
00166 {
00167 unsigned char *tmp;
00168 get_ptr(&tmp);
00169 if (value.copy((char*) tmp, get_length(), charset()))
00170 {
00171 Field_blob::reset();
00172 return 1;
00173 }
00174 tmp=(unsigned char*) value.ptr();
00175 memcpy(ptr+sizeof(uint32_t),&tmp,sizeof(char*));
00176 return 0;
00177 }
00178 virtual unsigned char *pack(unsigned char *to, const unsigned char *from,
00179 uint32_t max_length, bool low_byte_first);
00180 unsigned char *pack_key(unsigned char *to, const unsigned char *from,
00181 uint32_t max_length, bool low_byte_first);
00182 virtual const unsigned char *unpack(unsigned char *to, const unsigned char *from,
00183 uint32_t , bool low_byte_first);
00184 void free() { value.free(); }
00185 inline void clear_temporary() { memset(&value, 0, sizeof(value)); }
00186 friend int field_conv(Field *to,Field *from);
00187 uint32_t size_of() const { return sizeof(*this); }
00188 bool has_charset(void) const
00189 { return charset() == &my_charset_bin ? false : true; }
00190 uint32_t max_display_length();
00191 };
00192
00193 }
00194
00195