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MySQL 5.1: Item_func_encrypt Class Reference

Item_func_encrypt Class Reference

#include <item_strfunc.h>

Inheritance diagram for Item_func_encrypt:

[legend]Collaboration diagram for Item_func_encrypt:

[legend]List of all members.


Public Member Functions
	Item_func_encrypt (Item *a)
	Item_func_encrypt (Item a, Item b)
String *	val_str (String *)
void	fix_length_and_dec ()
const char *	func_name () const
Private Attributes
String	tmp_value

Detailed Description

Definition at line 333 of file item_strfunc.h.

Constructor & Destructor Documentation

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

Definition at line 337 of file item_strfunc.h.

00337 :Item_str_func(a) {}

Item_func_encrypt::Item_func_encrypt	(	Item *	a,
		Item *	b
	)			`[inline]`

Definition at line 338 of file item_strfunc.h.

00338 : Item_str_func(a,b) {}

Member Function Documentation

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

Implements Item_result_field.

Definition at line 340 of file item_strfunc.h.

References Item::max_length, and Item::maybe_null.

00340 { maybe_null=1; max_length = 13; }

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

Implements Item_func.

Definition at line 341 of file item_strfunc.h.

00341 { return "encrypt"; }

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

Implements Item.

Definition at line 1573 of file item_strfunc.cc.

References Item_func::arg_count, Item_func::args, bin_to_ascii, String::c_ptr(), String::charset(), String::copy(), current_thd, DBUG_ASSERT, Item::fixed, String::length(), LOCK_crypt, my_empty_string(), Item::null_value, pthread_mutex_lock, pthread_mutex_unlock, String::set(), strlen(), tmp_value, and Item::val_str().

01574 {
01575   DBUG_ASSERT(fixed == 1);
01576   String *res  =args[0]->val_str(str);
01577 
01578 #ifdef HAVE_CRYPT
01579   char salt[3],*salt_ptr;
01580   if ((null_value=args[0]->null_value))
01581     return 0;
01582   if (res->length() == 0)
01583     return &my_empty_string;
01584 
01585   if (arg_count == 1)
01586   {                                     // generate random salt
01587     time_t timestamp=current_thd->query_start();
01588     salt[0] = bin_to_ascii( (ulong) timestamp & 0x3f);
01589     salt[1] = bin_to_ascii(( (ulong) timestamp >> 5) & 0x3f);
01590     salt[2] = 0;
01591     salt_ptr=salt;
01592   }
01593   else
01594   {                                     // obtain salt from the first two bytes
01595     String *salt_str=args[1]->val_str(&tmp_value);
01596     if ((null_value= (args[1]->null_value || salt_str->length() < 2)))
01597       return 0;
01598     salt_ptr= salt_str->c_ptr();
01599   }
01600   pthread_mutex_lock(&LOCK_crypt);
01601   char *tmp= crypt(res->c_ptr(),salt_ptr);
01602   if (!tmp)
01603   {
01604     pthread_mutex_unlock(&LOCK_crypt);
01605     null_value= 1;
01606     return 0;
01607   }
01608   str->set(tmp,(uint) strlen(tmp),res->charset());
01609   str->copy();
01610   pthread_mutex_unlock(&LOCK_crypt);
01611   return str;
01612 #else
01613   null_value=1;
01614   return 0;
01615 #endif  /* HAVE_CRYPT */
01616 }

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Member Data Documentation

String Item_func_encrypt::tmp_value [private]

Definition at line 335 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 21:30:43 2006 for MySQL 5.1 by

1.4.7