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Attached are two small patches to expose md5 as a user function -- including

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documentation and regression test mods. It seemed small and unobtrusive enough
to not require a specific proposal on the hackers list -- but if not, let me
know and I'll make a pitch. Otherwise, if there are no objections please apply.

Joe Conway
This commit is contained in:
Bruce Momjian
2002-12-06 05:20:28 +00:00
parent 88ae9cd411
commit e87e82d2b7
7 changed files with 111 additions and 6 deletions
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29
src/backend/utils/adt/varlena.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/varlena.c,v 1.93 2002/11/17 23:01:30 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/varlena.c,v 1.94 2002/12/06 05:20:17 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -23,6 +23,7 @@
#include "utils/builtins.h"
#include "utils/pg_locale.h"
extern bool md5_hash(const void *buff, size_t len, char *hexsum);
typedef struct varlena unknown;
@ -1839,3 +1840,29 @@ to_hex64(PG_FUNCTION_ARGS)
result_text = PG_STR_GET_TEXT(ptr);
PG_RETURN_TEXT_P(result_text);
}
/*
* Create an md5 hash of a text string and return it as hex
*
* md5 produces a 16 byte (128 bit) hash; double it for hex
*/
#define MD5_HASH_LEN 32
Datum
md5_text(PG_FUNCTION_ARGS)
{
char *buff = PG_TEXT_GET_STR(PG_GETARG_TEXT_P(0));
size_t len = strlen(buff);
char *hexsum;
text *result_text;
/* leave room for the terminating '\0' */
hexsum = (char *) palloc(MD5_HASH_LEN + 1);
/* get the hash result */
md5_hash((void *) buff, len, hexsum);
/* convert to text and return it */
result_text = PG_STR_GET_TEXT(hexsum);
PG_RETURN_TEXT_P(result_text);
}