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/* $Id: mysql_checksum.c 1525 2014-08-03 12:34:17Z coelho $
*
* This function computes a simple and fast checksum of a binary
* It is unclear to me what happends on different encodings.
* NOT CRYPTOGRAPHICALLY SECURE.
*/
// minimal headers
#include <my_global.h>
#include <mysql.h>
/* Jenkins-based hash functions
*/
/* foo_init, foo, foo_deinit */
my_bool cksum8_init(UDF_INIT *, UDF_ARGS *, char *);
longlong cksum8(UDF_INIT *, UDF_ARGS *, char *, char *);
my_bool cksum4_init(UDF_INIT *, UDF_ARGS *, char *);
longlong cksum4(UDF_INIT *, UDF_ARGS *, char *, char *);
my_bool cksum2_init(UDF_INIT *, UDF_ARGS *, char *);
longlong cksum2(UDF_INIT *, UDF_ARGS *, char *, char *);
#include "jenkins.c"
longlong cksum2(
UDF_INIT *initid __attribute__((unused)),
UDF_ARGS *args,
char *is_null,
char *error __attribute__((unused)))
{
// if in doubt, return NULL
if (args->arg_count!=1 || args->arg_type[0]!=STRING_RESULT)
{
*is_null = 1;
return 0;
}
return (longlong) checksum_int2(args->args[0], args->lengths[0]);
}
my_bool cksum2_init(
UDF_INIT *initid __attribute__((unused)),
UDF_ARGS *args __attribute__((unused)),
char *message __attribute__((unused)))
{
return 0;
}
longlong cksum4(
UDF_INIT *initid __attribute__((unused)),
UDF_ARGS *args,
char *is_null __attribute__((unused)),
char *error __attribute__((unused)))
{
// if in doubt, return NULL
if (args->arg_count!=1 || args->arg_type[0]!=STRING_RESULT)
{
*is_null = 1;
return 0;
}
return (longlong) checksum_int4(args->args[0], args->lengths[0]);
}
my_bool cksum4_init(
UDF_INIT *initid __attribute__((unused)),
UDF_ARGS *args __attribute__((unused)),
char *message __attribute__((unused)))
{
return 0;
}
longlong cksum8(
UDF_INIT *initid __attribute__((unused)),
UDF_ARGS *args,
char *is_null __attribute__((unused)),
char *error __attribute__((unused)))
{
// if in doubt, return NULL
if (args->arg_count!=1 || args->arg_type[0]!=STRING_RESULT)
{
*is_null = 1;
return 0;
}
return (longlong) checksum_int8(args->args[0], args->lengths[0]);
}
my_bool cksum8_init(
UDF_INIT *initid __attribute__((unused)),
UDF_ARGS *args __attribute__((unused)),
char *message __attribute__((unused)))
{
return 0;
}
/* FNV-based hash functions
*/
my_bool fnv8_init(UDF_INIT *, UDF_ARGS *, char *);
longlong fnv8(UDF_INIT *, UDF_ARGS *, char *, char *);
my_bool fnv4_init(UDF_INIT *, UDF_ARGS *, char *);
longlong fnv4(UDF_INIT *, UDF_ARGS *, char *, char *);
my_bool fnv2_init(UDF_INIT *, UDF_ARGS *, char *);
longlong fnv2(UDF_INIT *, UDF_ARGS *, char *, char *);
#include "fnv.c"
longlong fnv2(
UDF_INIT *initid __attribute__((unused)),
UDF_ARGS *args,
char *is_null,
char *error __attribute__((unused)))
{
// if in doubt, return NULL
if (args->arg_count!=1 || args->arg_type[0]!=STRING_RESULT)
{
*is_null = 1;
return 0;
}
return (longlong) checksum_int2(args->args[0], args->lengths[0]);
}
my_bool fnv2_init(
UDF_INIT *initid __attribute__((unused)),
UDF_ARGS *args __attribute__((unused)),
char *message __attribute__((unused)))
{
return 0;
}
longlong fnv4(
UDF_INIT *initid __attribute__((unused)),
UDF_ARGS *args,
char *is_null __attribute__((unused)),
char *error __attribute__((unused)))
{
// if in doubt, return NULL
if (args->arg_count!=1 || args->arg_type[0]!=STRING_RESULT)
{
*is_null = 1;
return 0;
}
return (longlong) checksum_int4(args->args[0], args->lengths[0]);
}
my_bool fnv4_init(
UDF_INIT *initid __attribute__((unused)),
UDF_ARGS *args __attribute__((unused)),
char *message __attribute__((unused)))
{
return 0;
}
longlong fnv8(
UDF_INIT *initid __attribute__((unused)),
UDF_ARGS *args,
char *is_null __attribute__((unused)),
char *error __attribute__((unused)))
{
// if in doubt, return NULL
if (args->arg_count!=1 || args->arg_type[0]!=STRING_RESULT)
{
*is_null = 1;
return 0;
}
return (longlong) checksum_int8(args->args[0], args->lengths[0]);
}
my_bool fnv8_init(
UDF_INIT *initid __attribute__((unused)),
UDF_ARGS *args __attribute__((unused)),
char *message __attribute__((unused)))
{
return 0;
}
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