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Implement md5(bytea), update regression tests and documentation. Patch

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from Abhijit Menon-Sen, minor editorialization from Neil Conway. Also,
improve md5(text) to allocate a constant-sized buffer on the stack
rather than via palloc.

Catalog version bumped.
This commit is contained in:
Neil Conway
2005-05-20 01:29:56 +00:00
parent ff0c143a3b
commit f3567eeaf2
7 changed files with 99 additions and 10 deletions
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29
src/backend/utils/adt/varlena.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/varlena.c,v 1.120 2005/05/01 18:56:18 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/varlena.c,v 1.121 2005/05/20 01:29:55 neilc Exp $
*
*-------------------------------------------------------------------------
*/
@ -2308,15 +2308,12 @@ md5_text(PG_FUNCTION_ARGS)
{
text *in_text = PG_GETARG_TEXT_P(0);
size_t len;
char *hexsum;
char hexsum[MD5_HASH_LEN + 1];
text *result_text;
/* Calculate the length of the buffer using varlena metadata */
len = VARSIZE(in_text) - VARHDRSZ;
/* leave room for the terminating '\0' */
hexsum = (char *) palloc(MD5_HASH_LEN + 1);
/* get the hash result */
if (md5_hash(VARDATA(in_text), len, hexsum) == false)
ereport(ERROR,
@ -2327,3 +2324,25 @@ md5_text(PG_FUNCTION_ARGS)
result_text = PG_STR_GET_TEXT(hexsum);
PG_RETURN_TEXT_P(result_text);
}
/*
* Create an md5 hash of a bytea field and return it as a hex string:
* 16-byte md5 digest is represented in 32 hex characters.
*/
Datum
md5_bytea(PG_FUNCTION_ARGS)
{
bytea *in = PG_GETARG_BYTEA_P(0);
size_t len;
char hexsum[MD5_HASH_LEN + 1];
text *result_text;
len = VARSIZE(in) - VARHDRSZ;
if (md5_hash(VARDATA(in), len, hexsum) == false)
ereport(ERROR,
(errcode(ERRCODE_OUT_OF_MEMORY),
errmsg("out of memory")));
result_text = PG_STR_GET_TEXT(hexsum);
PG_RETURN_TEXT_P(result_text);
}