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• Atj-java-primitive-array-model

Byte-array-read

Read a component from a Java byte array.

Signature

(byte-array-read array index) → component

Arguments

array — Guard (byte-arrayp array).

index — Guard (int-valuep index).

Returns

component — Type (byte-valuep component).

Definitions and Theorems

Function: byte-array-read

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

Theorem: byte-valuep-of-byte-array-read

(defthm byte-valuep-of-byte-array-read
  (b* ((component (byte-array-read array index)))
    (byte-valuep component))
  :rule-classes :rewrite)