cleanup: Field_blob::get_ptr()

and declare few other Field getters to be 'const'

sql/field.cc

@@ -7883,7 +7883,7 @@ void Field_blob::store_length(uchar *i_ptr, uint i_packlength, uint32 i_number)
 }
 
 
-uint32 Field_blob::get_length(const uchar *pos, uint packlength_arg)
+uint32 Field_blob::get_length(const uchar *pos, uint packlength_arg) const
 {
   return (uint32)read_lowendian(pos, packlength_arg);
 }
@@ -7898,8 +7898,7 @@ int Field_blob::copy_value(Field_blob *from)
   DBUG_ASSERT(field_charset == from->charset());
   int rc= 0;
   uint32 length= from->get_length();
-  uchar *data;
-  from->get_ptr(&data);
+  uchar *data= from->get_ptr();
   if (packlength < from->packlength)
   {
     set_if_smaller(length, Field_blob::max_data_length());
@@ -8146,7 +8145,7 @@ uint Field_blob::get_key_image(uchar *buff,uint length, imagetype type_arg)
       bzero(buff, image_length);
       return image_length;
     }
-    get_ptr(&blob);
+    blob= get_ptr();
     gobj= Geometry::construct(&buffer, (char*) blob, blob_length);
     if (!gobj || gobj->get_mbr(&mbr, &dummy))
       bzero(buff, image_length);
@@ -8161,7 +8160,7 @@ uint Field_blob::get_key_image(uchar *buff,uint length, imagetype type_arg)
   }
 #endif /*HAVE_SPATIAL*/
 
-  get_ptr(&blob);
+  blob= get_ptr();
   uint local_char_length= length / field_charset->mbmaxlen;
   local_char_length= my_charpos(field_charset, blob, blob + blob_length,
                           local_char_length);
@@ -8320,7 +8319,7 @@ uchar *Field_blob::pack(uchar *to, const uchar *from, uint max_length)
    */
   if (length > 0)
   {
-    get_ptr((uchar**) &from);
+    from= get_ptr();
     memcpy(to+packlength, from,length);
   }
   ptr=save;					// Restore org row pointer

sql/field.h

@@ -1265,7 +1265,7 @@ class Field: public Value_source
   virtual uint max_packed_col_length(uint max_length)
   { return max_length;}
 
-  uint offset(uchar *record)
+  uint offset(uchar *record) const
   {
     return (uint) (ptr - record);
   }
@@ -3266,30 +3266,29 @@ class Field_blob :public Field_longstr {
   {
     store_length(ptr, packlength, number);
   }
-  inline uint32 get_length(uint row_offset= 0)
+  inline uint32 get_length(uint row_offset= 0) const
   { return get_length(ptr+row_offset, this->packlength); }
-  uint32 get_length(const uchar *ptr, uint packlength);
-  uint32 get_length(const uchar *ptr_arg)
+  uint32 get_length(const uchar *ptr, uint packlength) const;
+  uint32 get_length(const uchar *ptr_arg) const
   { return get_length(ptr_arg, this->packlength); }
-  inline void get_ptr(uchar **str)
-    {
-      memcpy(str, ptr+packlength, sizeof(uchar*));
-    }
-  inline void get_ptr(uchar **str, uint row_offset)
-    {
-      memcpy(str, ptr+packlength+row_offset, sizeof(char*));
-    }
+  inline uchar *get_ptr() const { return get_ptr(0); }
+  inline uchar *get_ptr(my_ptrdiff_t row_offset) const
+  {
+    uchar *s;
+    memcpy(&s, ptr + packlength + row_offset, sizeof(uchar*));
+    return s;
+  }
   inline void set_ptr(uchar *length, uchar *data)
-    {
-      memcpy(ptr,length,packlength);
-      memcpy(ptr+packlength, &data,sizeof(char*));
-    }
+  {
+    memcpy(ptr,length,packlength);
+    memcpy(ptr+packlength, &data,sizeof(char*));
+  }
   void set_ptr_offset(my_ptrdiff_t ptr_diff, uint32 length, uchar *data)
-    {
-      uchar *ptr_ofs= ADD_TO_PTR(ptr,ptr_diff,uchar*);
-      store_length(ptr_ofs, packlength, length);
-      memcpy(ptr_ofs+packlength, &data, sizeof(char*));
-    }
+  {
+    uchar *ptr_ofs= ADD_TO_PTR(ptr,ptr_diff,uchar*);
+    store_length(ptr_ofs, packlength, length);
+    memcpy(ptr_ofs+packlength, &data, sizeof(char*));
+  }
   inline void set_ptr(uint32 length, uchar *data)
   {
     set_ptr_offset(0, length, data);
@@ -3303,8 +3302,7 @@ class Field_blob :public Field_longstr {
   void sql_type(String &str) const;
   inline bool copy()
   {
-    uchar *tmp;
-    get_ptr(&tmp);
+    uchar *tmp= get_ptr();
     if (value.copy((char*) tmp, get_length(), charset()))
     {
       Field_blob::reset();
@@ -3320,7 +3318,7 @@ class Field_blob :public Field_longstr {
   uint packed_col_length(const uchar *col_ptr, uint length);
   uint max_packed_col_length(uint max_length);
   void free() { value.free(); }
-  inline void clear_temporary() { bzero((uchar*) &value,sizeof(value)); }
+  inline void clear_temporary() { bzero((uchar*) &value, sizeof(value)); }
   uint size_of() const { return sizeof(*this); }
   bool has_charset(void) const
   { return charset() == &my_charset_bin ? FALSE : TRUE; }

sql/sql_insert.cc

@@ -3126,9 +3126,7 @@ static void free_delayed_insert_blobs(register TABLE *table)
   {
     if ((*ptr)->flags & BLOB_FLAG)
     {
-      uchar *str;
-      ((Field_blob *) (*ptr))->get_ptr(&str);
-      my_free(str);
+      my_free(((Field_blob *) (*ptr))->get_ptr());
       ((Field_blob *) (*ptr))->reset();
     }
   }

sql/sql_join_cache.cc

@@ -1304,7 +1304,7 @@ uint JOIN_CACHE::write_record_data(uchar * link, bool *is_full)
         uint blob_len= blob_field->get_length();
         (*copy_ptr)->blob_length= blob_len;
         len+= blob_len;
-        blob_field->get_ptr(&(*copy_ptr)->str);
+        (*copy_ptr)->str= blob_field->get_ptr();
       }
     }
   }

storage/archive/ha_archive.cc

@@ -383,8 +383,7 @@ unsigned int ha_archive::pack_row_v1(uchar *record)
     uint32 length= ((Field_blob *) table->field[*blob])->get_length();
     if (length)
     {
-      uchar *data_ptr;
-      ((Field_blob *) table->field[*blob])->get_ptr(&data_ptr);
+      uchar *data_ptr= ((Field_blob *) table->field[*blob])->get_ptr();
       memcpy(pos, data_ptr, length);
       pos+= length;
     }