-(defun base64-to-string (string &key (uri nil))
- "Decode a base64 string to a string array."
- (declare (string string)
- (optimize (speed 3)))
- (let ((pad (if uri *uri-pad-char* *pad-char*))
- (decode-table (if uri *uri-decode-table* *decode-table*)))
- (declare (type decode-table decode-table)
- (character pad))
- (let ((result (make-string (* 3 (truncate (length string) 4))))
- (ridx 0))
- (declare (simple-string result)
- (fixnum ridx))
- (loop
- for char of-type character across string
- for svalue of-type fixnum = (aref decode-table
- (the fixnum (char-code char)))
- with bitstore of-type fixnum = 0
- with bitcount of-type fixnum = 0
- do
- (cond
- ((>= svalue 0)
- (setf bitstore (logior
- (the fixnum (ash bitstore 6))
- svalue))
- (incf bitcount 6)
- (when (>= bitcount 8)
- (decf bitcount 8)
- (setf (char result ridx)
- (code-char (the fixnum
- (logand
- (the fixnum
- (ash bitstore
- (the fixnum (- bitcount))))
- #xFF))))
- (incf ridx)
- (setf bitstore (the fixnum (logand bitstore #xFF)))))
- ((char= char pad)
- ;; Could add checks to make sure padding is correct
- ;; Currently, padding is ignored
- )
- ((whitespace-p char)
- ;; Ignore whitespace
- )
- ((minusp svalue)
- (warn "Bad character ~W in base64 decode" char))
-))
- (subseq result 0 ridx))))
+#+ignore
+(defmacro def-base64-stream-to-* (output-type)
+ `(defun ,(intern (concatenate 'string (symbol-name :base64-stream-to-)
+ (symbol-name output-type)))
+ (input &key (uri nil)
+ ,@(when (eq output-type :stream)
+ '(stream)))
+ ,(concatenate 'string "Decode base64 stream to " (string-downcase
+ (symbol-name output-type)))
+ (declare (stream input)
+ (optimize (speed 3) (space 0) (safety 0)))
+ (let ((pad (if uri *uri-pad-char* *pad-char*))
+ (decode-table (if uri *uri-decode-table* *decode-table*)))
+ (declare (type decode-table decode-table)
+ (type character pad))
+ (let (,@(case output-type
+ (:string
+ '((result (make-string (* 3 (truncate (length string) 4))))))
+ (:usb8-array
+ '((result (make-array (* 3 (truncate (length string) 4))
+ :element-type '(unsigned-byte 8)
+ :fill-pointer nil
+ :adjustable nil)))))
+ (ridx 0))
+ (declare ,@(case output-type
+ (:string
+ '((simple-string result)))
+ (:usb8-array
+ '((type (simple-array (unsigned-byte 8) (*)) result))))
+ (fixnum ridx))
+ (do* ((bitstore 0)
+ (bitcount 0)
+ (char (read-char stream nil #\null)
+ (read-char stream nil #\null)))
+ ((eq char #\null)
+ ,(case output-type
+ (:stream
+ 'stream)
+ ((:string :usb8-array)
+ 'result)
+ ;; ((:stream :string)
+ ;; '(subseq result 0 ridx))))
+ ))
+ (declare (fixnum bitstore bitcount)
+ (character char))
+ (let ((svalue (aref decode-table (the fixnum (char-code char)))))
+ (declare (fixnum svalue))
+ (cond
+ ((>= svalue 0)
+ (setf bitstore (logior
+ (the fixnum (ash bitstore 6))
+ svalue))
+ (incf bitcount 6)
+ (when (>= bitcount 8)
+ (decf bitcount 8)
+ (let ((ovalue (the fixnum
+ (logand
+ (the fixnum
+ (ash bitstore
+ (the fixnum (- bitcount))))
+ #xFF))))
+ (declare (fixnum ovalue))
+ ,(case output-type
+ (:string
+ '(setf (char result ridx) (code-char ovalue)))
+ (:usb8-array
+ '(setf (aref result ridx) ovalue))
+ (:stream
+ '(write-char (code-char ovalue) stream)))
+ (incf ridx)
+ (setf bitstore (the fixnum (logand bitstore #xFF))))))
+ ((char= char pad)
+ ;; Could add checks to make sure padding is correct
+ ;; Currently, padding is ignored
+ )
+ ((whitespace-p char)
+ ;; Ignore whitespace
+ )
+ ((minusp svalue)
+ (warn "Bad character ~W in base64 decode" char))
+ )))))))