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/* vim: expandtab:shiftwidth=2:tabstop=2:smarttab:
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 <config.h>
#include <cstdio>
#include <cstddef>
#include <gcrypt.h>
#include <drizzled/charset.h>
#include <drizzled/charset_info.h>
#include <drizzled/function/str/strfunc.h>
#include <drizzled/item/func.h>
#include <drizzled/plugin/function.h>
using namespace std;
using namespace drizzled;
class Md5Function : public Item_str_func
{
public:
Md5Function() : Item_str_func() {}
String *val_str(String*);
void fix_length_and_dec()
{
max_length= 32;
args[0]->collation.set(
get_charset_by_csname(args[0]->collation.collation->csname,
MY_CS_BINSORT), DERIVATION_COERCIBLE);
}
const char *func_name() const
{
return "md5";
}
bool check_argument_count(int n)
{
return (n == 1);
}
};
String *Md5Function::val_str(String *str)
{
assert(fixed == true);
String *sptr= args[0]->val_str(str);
if (sptr == NULL || str->alloc(32))
{
null_value= true;
return 0;
}
null_value= false;
str->set_charset(&my_charset_bin);
gcry_md_hd_t md5_context;
gcry_md_open(&md5_context, GCRY_MD_MD5, 0);
gcry_md_write(md5_context, sptr->ptr(), sptr->length());
unsigned char *digest= gcry_md_read(md5_context, 0);
snprintf((char *) str->ptr(), 33,
"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
digest[0], digest[1], digest[2], digest[3],
digest[4], digest[5], digest[6], digest[7],
digest[8], digest[9], digest[10], digest[11],
digest[12], digest[13], digest[14], digest[15]);
str->length((uint32_t) 32);
gcry_md_close(md5_context);
return str;
}
plugin::Create_function<Md5Function> *md5udf= NULL;
static int initialize(module::Context &context)
{
/* Initialize libgcrypt */
if (not gcry_check_version(GCRYPT_VERSION))
{
errmsg_printf(error::ERROR, _("libgcrypt library version mismatch"));
return 1;
}
/* Disable secure memory. */
gcry_control (GCRYCTL_DISABLE_SECMEM, 0);
/* Tell Libgcrypt that initialization has completed. */
gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
md5udf= new plugin::Create_function<Md5Function>("md5");
context.add(md5udf);
return 0;
}
DRIZZLE_DECLARE_PLUGIN
{
DRIZZLE_VERSION_ID,
"md5",
"1.0",
"Stewart Smith",
"UDF for computing md5sum",
PLUGIN_LICENSE_GPL,
initialize, /* Plugin Init */
NULL, /* depends */
NULL /* config options */
}
DRIZZLE_DECLARE_PLUGIN_END;
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