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• Base64

Base64-encode-list

Base64 encode a character list.

Signature

(base64-encode-list x) → x-enc

Arguments

x — Character list to encode.
    Guard (character-listp x).

Returns

x-enc — Encoded version of x.
    Type (character-listp x-enc).

Definitions and Theorems

Function: base64-encode-list

(defun base64-encode-list (x)
  (declare (xargs :guard (character-listp x)))
  (let ((acl2::__function__ 'base64-encode-list))
    (declare (ignorable acl2::__function__))
    (mbe :logic
         (b* (((when (atom x)) nil)
              ((when (atom (cdddr x)))
               (b* (((mv c1 c2 c3 c4)
                     (b64-encode-last-group x)))
                 (list c1 c2 c3 c4)))
              ((mv c1 c2 c3 c4)
               (b64-enc3 (first x)
                         (second x)
                         (third x))))
           (append (list c1 c2 c3 c4)
                   (base64-encode-list (cdddr x))))
         :exec (reverse (b64-encode-list-impl x nil)))))

Theorem: character-listp-of-base64-encode-list

(defthm character-listp-of-base64-encode-list
  (b* ((x-enc (base64-encode-list x)))
    (character-listp x-enc))
  :rule-classes :rewrite)

Theorem: b64-encode-list-impl-removal

(defthm b64-encode-list-impl-removal
  (equal (b64-encode-list-impl x acc)
         (revappend (base64-encode-list x) acc)))