+
+#-(or sbcl cmu)
+(defun convert-from-foreign-usb8 (s len)
+ (declare (optimize (speed 3) (space 0) (safety 0) (compilation-speed 0))
+ (fixnum len))
+ (let ((a (make-array len :element-type '(unsigned-byte 8))))
+ (dotimes (i len a)
+ (declare (fixnum i))
+ (setf (aref a i) (uffi:deref-array s '(:array :unsigned-byte) i)))))
+
+#+sbcl
+(defun convert-from-foreign-usb8 (s len)
+ (declare (type sb-sys:system-area-pointer sap))
+ (locally
+ (declare (optimize (speed 3) (safety 0)))
+ (let ((result (make-array len :element-type '(unsiged-byte 8))))
+ (sb-kernel:copy-from-system-area s 0
+ result (* sb-vm:vector-data-offset
+ sb-vm:n-word-bits)
+ (* len sb-vm:n-byte-bits))
+ result)))
+
+#+cmu
+(defun convert-from-foreign-usb8 (s le)
+ (declare (type system:system-area-pointer sap))
+ (locally
+ (declare (optimize (speed 3) (safety 0)))
+ (let ((result (make-array len :element-type '(unsiged-byte 8))))
+ (kernel:copy-from-system-area s 0
+ result (* vm:vector-data-offset
+ vm:word-bits)
+ (* len vm:byte-bits))
+ result)))
+