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• Read-bytes$-n

Read-16ube-n

(read-16ube-n n channel state) reads n 16-bit, unsigned, big-endian values from the input channel and returns them as a list.

Definitions and Theorems

Function: tr-read-16ube-n

(defun tr-read-16ube-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-16ube channel state)
      (cond ((eq byte nil) (mv 'fail state))
            ((eq byte 'fail) (mv 'fail state))
            (t (tr-read-16ube-n (1- n)
                                channel state (cons byte acc)))))))

Function: read-16ube-n

(defun read-16ube-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-16ube channel state)
           (cond ((eq byte nil) (mv 'fail state))
                 ((eq byte 'fail) (mv 'fail state))
                 (t (mv-let (rest state)
                            (read-16ube-n (1- n) channel state)
                      (mv (if (eq rest 'fail)
                              'fail
                            (cons byte rest))
                          state))))))
       :exec (tr-read-16ube-n n channel state nil)))

Theorem: read-16ube-n-state

(defthm read-16ube-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-16ube-n n channel state)))))

Theorem: read-16ube-n-open-input-channel

(defthm read-16ube-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-16ube-n n channel state)))))

Theorem: read-16ube-n-data

(defthm read-16ube-n-data
  (implies
       (not (equal (mv-nth 0 (read-16ube-n n channel state))
                   'fail))
       (and (true-listp (mv-nth 0 (read-16ube-n n channel state)))
            (equal (len (mv-nth 0 (read-16ube-n n channel state)))
                   (nfix n)))))