Enum binary access

Hi there,

we tried to create the libpqtypes enum binary send but it doesn't work:

// register types
PGregisterType user_def[] = { {"seqtype", enum_put, enum_get} };
PQregisterTypes(connector->getConn(), PQT_USERDEFINED, user_def, 1, 0);

// enum_put throws format error
int enum_put (PGtypeArgs *args ) {

char *val = va_arg(args->ap, char *);
char *out = NULL;
int vallen = 0, len = 0, oid = 0;
float sortorder = 0.0;

if (!args || !val) return 0;

/* expand buffer enough */
vallen = strlen(val);
len = sizeof(int) + sizeof(float) + (vallen * sizeof(char));
if (args->put.expandBuffer(args, len) == -1) return -1;

/* put header (oid, sortorder) and value */
out = args->put.out;
memcpy(out, &oid, sizeof(int));
out += sizeof(int);
memcpy(out, &sortorder, sizeof(float));
out += sizeof(float);
memcpy(out, val, vallen);

return len;
}

// enum_get (FYI, get works OK)
int enum_get (PGtypeArgs *args) {
char *val = PQgetvalue(args->get.result, args->get.tup_num,
args->get.field_num);
int len = PQgetlength(args->get.result, args->get.tup_num,
args->get.field_num);
char **result = va_arg(args->ap, char **);
*result = (char *) PQresultAlloc((PGresult *) args->get.result, len
* sizeof(char));
memcpy(*result, val, len * sizeof(char));
return 0;
}

Postgres doesn't accept enum sent like this and throws format error.
This should be used as a prototype for derived types. There is no real
"enum" named type. Libpqypes doesn't seem to provide simplified binary
manipulation for enum types.

What should we do, please? Can you fix it? I think there is more people
that need access enum types in binary mode.

Cheers,

Petr and Vojtech

P.S. We have created the 9.1's cube extension send/receive functionality
as in https://gitorious.org/vtapi/vtapi/trees/master/postgres/cube