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• Read-bytes$-n

Read-32ule-n

(read-32ule-n n channel state) reads n 32-bit, unsigned, little-endian values from the input channel and returns them as a list.

Definitions and Theorems

Function: tr-read-32ule-n

(defun
 tr-read-32ule-n (n channel state acc)
 (declare (xargs :guard (and (natp n)
                             (state-p state)
                             (symbolp channel)
                             (open-input-channel-p channel
                                                   :byte state)
                             (true-listp acc))))
 (if
  (mbe :logic (zp n) :exec (= 0 n))
  (mv (reverse acc) state)
  (mv-let
       (byte state)
       (read-32ule channel state)
       (cond ((eq byte nil) (mv 'fail state))
             ((eq byte 'fail) (mv 'fail state))
             (t (tr-read-32ule-n (1- n)
                                 channel state (cons byte acc)))))))

Function: read-32ule-n

(defun
 read-32ule-n (n channel state)
 (declare (xargs :guard (and (natp n)
                             (state-p state)
                             (symbolp channel)
                             (open-input-channel-p channel
                                                   :byte state))))
 (mbe
    :logic
    (if (zp n)
        (mv nil state)
        (mv-let (byte state)
                (read-32ule channel state)
                (cond ((eq byte nil) (mv 'fail state))
                      ((eq byte 'fail) (mv 'fail state))
                      (t (mv-let (rest state)
                                 (read-32ule-n (1- n) channel state)
                                 (mv (if (eq rest 'fail)
                                         'fail
                                         (cons byte rest))
                                     state))))))
    :exec (tr-read-32ule-n n channel state nil)))

Theorem: read-32ule-n-state

(defthm
     read-32ule-n-state
     (implies (and (force (state-p1 state))
                   (force (symbolp channel))
                   (force (open-input-channel-p1 channel
                                                 :byte state)))
              (state-p1 (mv-nth 1 (read-32ule-n n channel state)))))

Theorem: read-32ule-n-open-input-channel

(defthm
    read-32ule-n-open-input-channel
    (implies (and (force (state-p1 state))
                  (force (symbolp channel))
                  (force (open-input-channel-p1 channel
                                                :byte state)))
             (open-input-channel-p1
                  channel
                  :byte (mv-nth 1 (read-32ule-n n channel state)))))

Theorem: read-32ule-n-data

(defthm
    read-32ule-n-data
    (implies
         (not (equal (mv-nth 0 (read-32ule-n n channel state))
                     'fail))
         (and (true-listp (mv-nth 0 (read-32ule-n n channel state)))
              (equal (len (mv-nth 0 (read-32ule-n n channel state)))
                     (nfix n)))))