Jonathon McKitrick <j_mckitrick@bigfoot.com> wrote:
+---------------
| I'd like to use Ironclad for md5 hashing and http authentication.  Is
| there a simple or straight-forward way to convert the string values I
| get from http into (simple-array (unsigned-byte 8) (*))?
| 
| I keep thinking I've figured this out, but I'm not quite there yet.
| 
|   (defparameter *data* (make-array 8 :element-type :unsigned-byte
|                 :adjustable nil :fill-pointer nil :displaced-to nil))
| works, but
|   (ironclad:update-digest *digest* *data*)
| complains that
|   #(0 0 0 0 0 0 0 0) is not of type (simple-array (unsigned-byte 8) (*))
| and
|   (type-of *data*) is (simple-vector 8)
| and
|   (type-of (elt *data* 0)) is bit.
+---------------

The problem is probably that your MAKE-ARRAY is insufficiently-specific
to get what you need. Try executing:

    (upgraded-array-element-type 'unsigned-byte)

and see what your local implementation gives you back -- probably T,
but almost certainly *NOT* (UNSIGNED-BYTE 8)!!  So try this instead:

    > (defparameter *data* (make-array 8 :element-type '(unsigned-byte 8)
					 :initial-element 0))

    *DATA*
    > *data*

    #(0 0 0 0 0 0 0 0)
    > (type-of *data*)

    (SIMPLE-ARRAY (UNSIGNED-BYTE 8) (8))
    > (type-of (elt *data* 0))

    (INTEGER 0 0)
    > 

It would probably also be good to add an ":INITIAL-ELEMENT 0" to your
MAKE-ARRAY [as I did above], rather than assuming the implementation
will default it for you, since:

    If initial-element is not supplied, the consequences of
    later reading an uninitialized element of new-array are
    undefined unless either initial-contents is supplied or
    displaced-to is non-nil.

Conversely, since NIL *is* defined as the default for all of
the :ADJUSTABLE, :FILL-POINTER, & :DISPLACED-TO parameters,
you don't need to specify them here.


-Rob

-----
Rob Warnock			<rpw3@rpw3.org>
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