Re: Undefined type LDAP_UINT4 (ITS#341)

[kst@SDSC.EDU]

> SHA1 code requires that uint32 to be EXACTLY 32 bits long.

I'm working on a tentative solution.  In ldap/include/ac/bytes.h,
I'm adding code that will use type {signed,unsigned,} short for
LDAP_{S,U,}INT4 if short is 4 bytes (and both int and long are
bigger than 4 bytes).  This covers the T3E.  If neither long, int,
nor short is 4 bytes, it falls through to a "#error" directive; this
means it won't compile on the Cray T90, but at least the reason for
the failure will be clear.

In ldap/include/lutil_md5.h, the comment states that uint32 should
be defined as unsigned long, so I'll just leave it that way.
In ldap/include/lutil_sha1.h, I'll define uint32 as LDAP_UINT4,
which is now guaranteed to be exactly 4 bytes.

I'm not comfortable about uint32 being defined differently in
two different headers.  If both headers are included in the same
compilation unit, the first one included will get to define uint32
(since the typedef is surrounded by #ifndef ... #endif); this would
be A Bad Thing.  If there's no chance of this happening, it's merely
poor style, IMHO.  For that matter, the name uint32 is commonly used
in system headers; for example, see <rpc/rpc_sztypes.h> on Solaris.
I strongly suggest picking a name, or names, unique to LDAP.

Comments?

Note that C99 defines a number of integer typedefs in the new
header <stdint.h>.  The type uint32_t, which is guaranteed to be
exactly 32 bits wide, would be suitable as a replacement for the
uint32 in lutil_sha1.h.  The type uint_least32_t would be a good
choice for the uint32 in lutil_md5.h.  Of course, few implementations
provide this header, but Doug Gwyn has written public-domain versions
of several C99 headers that will work with a C89 implementation.
See <http://www.lysator.liu.se/c/q8/index.html>.

> Also note, we, in general, prefer to apply changes to OpenLDAP-devel
> first and then back port the changes to 1.2.

At this point, my top priority is to get this working with Globus.
Globus is currently using a patched version of OpenLDAP 1.2.7, available
at <ftp://ftp.globus.org/pub/globus/OpenLDAP-1.2.7-globus.tar.gz>,
so I need to work with the 1.2.7 sources for now.  Once that's stable,
I'll port the changes to OpenLDAP-devel -- and hopefully there'll be
no need for OpenLDAP-1.2.7-globus.

-- 
Keith Thompson, San Diego Supercomputer Center  kst@sdsc.edu
<http://www.sdsc.edu/~kst/>  Office: 858-822-0853  Fax: 858-534-5077
"Oh my gosh!  You are SO ahead of your time!" -- anon.