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MySQL 5.1: Item_func_unhex Class Reference

Item_func_unhex Class Reference

#include <item_strfunc.h>

Inheritance diagram for Item_func_unhex:

[legend]Collaboration diagram for Item_func_unhex:

[legend]List of all members.


Public Member Functions
	Item_func_unhex (Item *a)
const char *	func_name () const
String *	val_str (String *)
void	fix_length_and_dec ()
bool	check_partition_func_processor (byte *bool_arg)
Private Attributes
String	tmp_value

Detailed Description

Definition at line 602 of file item_strfunc.h.

Constructor & Destructor Documentation

Item_func_unhex::Item_func_unhex ( Item * a ) [inline]

Definition at line 606 of file item_strfunc.h.

00606 :Item_str_func(a) {}

Member Function Documentation

bool Item_func_unhex::check_partition_func_processor ( byte * bool_arg ) [inline, virtual]

Reimplemented from Item.

Definition at line 615 of file item_strfunc.h.

00615 { return 0;}

void Item_func_unhex::fix_length_and_dec ( ) [inline, virtual]

Implements Item_result_field.

Definition at line 609 of file item_strfunc.h.

References Item_func::args, Item::collation, Item::decimals, Item::max_length, my_charset_bin, and DTCollation::set().

00610   {
00611     collation.set(&my_charset_bin);
00612     decimals=0;
00613     max_length=(1+args[0]->max_length)/2;
00614   }

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const char* Item_func_unhex::func_name ( ) const [inline, virtual]

Implements Item_func.

Definition at line 607 of file item_strfunc.h.

00607 { return "unhex"; }

String * Item_func_unhex::val_str ( String * ) [virtual]

Implements Item.

Definition at line 2553 of file item_strfunc.cc.

References String::alloc(), Item_func::args, DBUG_ASSERT, Item::fixed, from, String::length(), Item::null_value, String::ptr(), tmp_value, to, and Item::val_str().

02554 {
02555   const char *from, *end;
02556   char *to;
02557   String *res;
02558   uint length;
02559   DBUG_ASSERT(fixed == 1);
02560 
02561   res= args[0]->val_str(str);
02562   if (!res || tmp_value.alloc(length= (1+res->length())/2))
02563   {
02564     null_value=1;
02565     return 0;
02566   }
02567 
02568   from= res->ptr();
02569   null_value= 0;
02570   tmp_value.length(length);
02571   to= (char*) tmp_value.ptr();
02572   if (res->length() % 2)
02573   {
02574     int hex_char;
02575     *to++= hex_char= hexchar_to_int(*from++);
02576     if ((null_value= (hex_char == -1)))
02577       return 0;
02578   }
02579   for (end=res->ptr()+res->length(); from < end ; from+=2, to++)
02580   {
02581     int hex_char;
02582     *to= (hex_char= hexchar_to_int(from[0])) << 4;
02583     if ((null_value= (hex_char == -1)))
02584       return 0;
02585     *to|= hex_char= hexchar_to_int(from[1]);
02586     if ((null_value= (hex_char == -1)))
02587       return 0;
02588   }
02589   return &tmp_value;
02590 }

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Member Data Documentation

String Item_func_unhex::tmp_value [private]

Definition at line 604 of file item_strfunc.h.

Referenced by val_str().

The documentation for this class was generated from the following files:

mysql/src/5.1-dbg/sql/item_strfunc.h
mysql/src/5.1-dbg/sql/item_strfunc.cc

Generated on Sat Sep 9 21:46:26 2006 for MySQL 5.1 by

1.4.7