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• Atj-java-primitive-array-model

Byte-array-write

Write a component to a Java byte array.

Signature

(byte-array-write array index component) → new-array

Arguments

array — Guard (byte-arrayp array).

index — Guard (int-valuep index).

component — Guard (byte-valuep component).

Returns

new-array — Type (byte-arrayp new-array).

Definitions and Theorems

Function: byte-array-write

(defun byte-array-write (array index component)
  (declare (xargs :guard (and (byte-arrayp array)
                              (int-valuep index)
                              (byte-valuep component))))
  (declare (xargs :guard (byte-array-index-in-range-p array index)))
  (let ((__function__ 'byte-array-write))
    (declare (ignorable __function__))
    (if (mbt (byte-array-index-in-range-p array index))
        (byte-array (update-nth (int-value->int index)
                                component
                                (byte-array->components array)))
      (byte-array-fix array))))

Theorem: byte-arrayp-of-byte-array-write

(defthm byte-arrayp-of-byte-array-write
  (b* ((new-array (byte-array-write array index component)))
    (byte-arrayp new-array))
  :rule-classes :rewrite)

Theorem: len-of-components-of-byte-array-write

(defthm len-of-components-of-byte-array-write
  (b* ((?new-array (byte-array-write array index component)))
    (equal (len (byte-array->components new-array))
           (len (byte-array->components array)))))

Theorem: byte-array-index-in-range-p-of-byte-array-write

(defthm byte-array-index-in-range-p-of-byte-array-write
  (b* ((?new-array (byte-array-write array index component)))
    (equal (byte-array-index-in-range-p new-array index1)
           (byte-array-index-in-range-p array index1))))