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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 <mysql_priv.h>
#include <stdlib.h>
#include <ctype.h>
#include <drizzle_version.h>
#include <drizzle/plugin.h>
#include <my_global.h>
#include <my_dir.h>
#include <zlib.h>
bool udf_init_crc32udf(UDF_INIT *initid, UDF_ARGS *args, char *message)
{
/* initid->ptr keeps state for between udf_init_foo and udf_deinit_foo */
initid->ptr= NULL;
if (args->arg_count != 1)
{
strcpy(message,"CRC32() requires one arguments");
return 1;
}
if (args->arg_type[0] != STRING_RESULT)
{
strcpy(message,"CRC32() requires a string");
return 1;
}
return 0;
}
long long udf_doit_crc32(UDF_INIT *initid, UDF_ARGS *args, char *result,
unsigned long *length, char *is_null, char *error)
{
(void)initid;
(void)result;
(void)length;
(void)is_null;
(void)error;
return (long long) crc32(0L, (uchar*)args->args[0], args->lengths[0]);
}
void udf_deinit_crc32udf(UDF_INIT *initid)
{
(void)initid;
/* if we allocated initid->ptr, free it here */
return;
}
static int crc32udf_plugin_init(void *p)
{
udf_func *udff= (udf_func *) p;
static char crc32str[6];
strcpy(crc32str,"crc32");
udff->name.str= crc32str;
udff->name.length= strlen("crc32");
udff->type= UDFTYPE_FUNCTION;
udff->returns= INT_RESULT;
udff->func_init= udf_init_crc32udf;
udff->func_deinit= udf_deinit_crc32udf;
udff->func= (Udf_func_any) udf_doit_crc32;
return 0;
}
static int crc32udf_plugin_deinit(void *p)
{
udf_func *udff = (udf_func *) p;
(void)udff;
return 0;
}
mysql_declare_plugin(crc32)
{
MYSQL_UDF_PLUGIN,
"crc32",
"1.0",
"Stewart Smith",
"UDF for computing CRC32",
PLUGIN_LICENSE_GPL,
crc32udf_plugin_init, /* Plugin Init */
crc32udf_plugin_deinit, /* Plugin Deinit */
NULL, /* status variables */
NULL, /* system variables */
NULL /* config options */
}
mysql_declare_plugin_end;
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