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/* Copyright (C) 2006 MySQL AB
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; version 2 of the License.
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 */
#include <drizzled/server_includes.h>
#include <drizzled/sql_udf.h>
#include <drizzled/functions/int.h>
class Item_func_uncompressed_length : public Item_int_func
{
String value;
public:
Item_func_uncompressed_length():Item_int_func(){}
const char *func_name() const{return "uncompressed_length";}
void fix_length_and_dec() { max_length=10; }
int64_t val_int();
};
int64_t Item_func_uncompressed_length::val_int()
{
assert(fixed == 1);
String *res= args[0]->val_str(&value);
if (!res)
{
null_value=1;
return 0; /* purecov: inspected */
}
null_value=0;
if (res->is_empty()) return 0;
/*
res->ptr() using is safe because we have tested that string is not empty,
res->c_ptr() is not used because:
- we do not need \0 terminated string to get first 4 bytes
- c_ptr() tests simbol after string end (uninitialiozed memory) which
confuse valgrind
*/
return uint4korr(res->ptr()) & 0x3FFFFFFF;
}
Item_func* create_uncompressed_lengthudf_item(MEM_ROOT* m)
{
return new (m) Item_func_uncompressed_length();
}
static struct udf_func uncompressed_lengthudf = {
{ C_STRING_WITH_LEN("uncompressed_length") },
create_uncompressed_lengthudf_item
};
static int uncompressed_lengthudf_plugin_init(void *p)
{
udf_func **f = (udf_func**) p;
*f= &uncompressed_lengthudf;
return 0;
}
static int uncompressed_lengthudf_plugin_deinit(void *p)
{
udf_func *udff = (udf_func *) p;
(void)udff;
return 0;
}
mysql_declare_plugin(uncompressed_length)
{
DRIZZLE_UDF_PLUGIN,
"uncompressed_length",
"1.0",
"Stewart Smith",
"UDF for compress()",
PLUGIN_LICENSE_GPL,
uncompressed_lengthudf_plugin_init, /* Plugin Init */
uncompressed_lengthudf_plugin_deinit, /* Plugin Deinit */
NULL, /* status variables */
NULL, /* system variables */
NULL /* config options */
}
mysql_declare_plugin_end;
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