;;;; Programmer: Kevin M. Rosenberg
;;;; Date Started: Dec 2002
;;;;
-;;;; $Id: encode.lisp,v 1.1 2003/01/12 20:25:26 kevin Exp $
+;;;; $Id: encode.lisp,v 1.2 2003/01/12 22:32:40 kevin Exp $
;;;;
;;;; This file implements the Base64 transfer encoding algorithm as
;;;; defined in RFC 1521 by Borensten & Freed, September 1993.
;;;; - Renamed functions now that supporting integer conversions
;;;; - URI-compatible encoding using :uri key
;;;;
-;;;; $Id: encode.lisp,v 1.1 2003/01/12 20:25:26 kevin Exp $
+;;;; $Id: encode.lisp,v 1.2 2003/01/12 22:32:40 kevin Exp $
(in-package #:cl-base64)
(the fixnum
(char-code (the character (char string (+ 2 isource)))))))
4))))))
-
-(defun integer-to-base64 (input &key (uri nil) (columns 0) (stream nil))
- (if stream
- (integer-to-base64-stream input stream :uri uri :columns columns)
- (integer-to-base64-string input :uri uri :columns columns)))
+
+(defmacro def-*-to-base64-* (input-type output-type)
+ `(defun ,(intern (concatenate 'string (symbol-name input-type)
+ (symbol-name :-to-base-64-)
+ (symbol-name output-type)))
+ (input
+ ,@(when (eq output-type :stream)
+ 'output)
+ &key (uri nil) (columns 0))
+ "Encode a string array to base64. If columns is > 0, designates
+maximum number of columns in a line and the string will be terminated
+with a #\Newline."
+ (declare (,@(case input-type
+ (:string
+ '((string input)))
+ (:usb8-array)
+ '((type (array fixnum (*))) input))
+ (fixnum columns)
+ (optimize (speed 3))))
+ (let ((pad (if uri *uri-pad-char* *pad-char*))
+ (encode-table (if uri *uri-encode-table* *encode-table*)))
+ (declare (simple-string encode-table)
+ (character pad))
+ (let* ((string-length (length input))
+ (complete-group-count (truncate string-length 3))
+ (remainder (nth-value 1 (truncate string-length 3)))
+ (padded-length (* 4 (truncate (+ string-length 2) 3)))
+ (num-lines (if (plusp columns)
+ (truncate (+ padded-length (1- columns)) columns)
+ 0))
+ (num-breaks (if (plusp num-lines)
+ (1- num-lines)
+ 0))
+ (strlen (if stream
+ 0
+ (+ padded-length num-breaks)))
+ (result (make-string strlen))
+ (col (if (plusp columns)
+ 0
+ (1+ padded-length)))
+ (ioutput 0))
+ (declare (fixnum string-length padded-length col ioutput)
+ (simple-string result))
+ (macrolet ((output-char (ch)
+ (if (= col columns)
+ (progn
+ (if stream
+ (write-char #\Newline stream)
+ (progn
+ (setf (schar result ioutput) #\Newline)
+ (incf ioutput)))
+ (setq col 1))
+ (incf col))
+ ,@(case output-type
+ (:stream
+ '((write-char ch stream))
+ (:string
+ '((setf (schar result ioutput) ch)
+ (incf ioutput)))))))
+ (labels ((output-group (svalue chars)
+ (declare (fixnum svalue chars))
+ (output-char
+ (schar encode-table
+ (the fixnum
+ (logand #x3f
+ (the fixnum (ash svalue -18))))))
+ (output-char
+ (schar encode-table
+ (the fixnum
+ (logand #x3f
+ (the fixnum (ash svalue -12))))))
+ (if (> chars 2)
+ (output-char
+ (schar encode-table
+ (the fixnum
+ (logand #x3f
+ (the fixnum (ash svalue -6))))))
+ (output-char pad))
+ (if (> chars 3)
+ (output-char
+ (schar encode-table
+ (the fixnum
+ (logand #x3f svalue))))
+ (output-char pad))))
+ (do ((igroup 0 (1+ igroup))
+ (isource 0 (+ isource 3)))
+ ((= igroup complete-group-count)
+ (cond
+ ((= remainder 2)
+ (output-group
+ (the fixnum
+ (+
+ (the fixnum
+ (ash
+ ,(case input-type
+ (:string
+ '(char-code (the character (char input isource))))
+ (:usb8-array
+ '(the fixnum (aref input isource))))
+ 16))
+ (the fixnum
+ (ash
+ ,(case input-type
+ (:string
+ '(char-code (the character (char input (1+ isource)))))
+ (:usb8-array
+ '(the fixnum (aref input (1+ isource)))))
+ 8))))
+ 3))
+ ((= remainder 1)
+ (output-group
+ (the fixnum
+ ,(case input-type
+ (:string
+ '(char-code (the character (char input isource))))
+ (:usb8-array
+ '(the fixnum (aref input isource)))))
+ 2)))
+ result)
+ (declare (fixnum igroup isource))
+ (output-group
+ (the fixnum
+ (+
+ (the fixnum
+ (ash
+ ,(case input-type
+ (:string
+ '(char-code (the character (char input isource))))
+ (:usb8-array
+ '(the fixnum (aref input isource))))
+ 16))
+ (the fixnum
+ (ash
+ ,(case input-type
+ (:string
+ '(char-code (the character (char input (1+ isource)))))
+ (:usb8-array
+ '(the fixnum (aref input (1+ isource)))))
+ 8))
+ (the fixnum
+ ,(case input-type
+ (:string
+ '(char-code (the character (char input (+ 2 isource)))))
+ (:usb8-array
+ '(the fixnum (aref input (+ 2 isource)))))
+ )))
+ 4))))))))
+
+(def-*-to-base64-* :string :string)
+(def-*-to-base64-* :string :stream)
+(def-*-to-base64-* :usb8-array :string)
+(def-*-to-base64-* :usb8-array :stream)
+
(defun integer-to-base64-string (input &key (uri nil) (columns 0))
"Encode an integer to base64 format."
projects / cl-base64.git / blobdiff