59 lines
2.0 KiB
Scheme
59 lines
2.0 KiB
Scheme
(define-record-type <pffi-array>
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(array-make type size pointer)
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pffi-array?
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(type pffi-array-type)
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(size pffi-array-size)
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(pointer pffi-array-pointer))
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(define pffi-list->array
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(lambda (type list-arg)
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(let* ((array-size (length list-arg))
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(type-size (c-size-of type))
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(array (make-c-bytevector (* type-size array-size)))
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(offset 0))
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(for-each
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(lambda (item)
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(pffi-pointer-set! array type offset item)
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(set! offset (+ offset type-size)))
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list-arg)
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(array-make type array-size array))))
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(define pffi-pointer->array
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(lambda (pointer type size)
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(array-make type size pointer)))
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(define pffi-array->list
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(lambda (array)
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(letrec* ((type (pffi-array-type array))
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(type-size (c-size-of type))
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(max-offset (* type-size (pffi-array-size array)))
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(array-pointer (pffi-array-pointer array))
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(looper (lambda (offset result)
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(if (= offset max-offset)
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result
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(looper (+ offset type-size)
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(append result
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(list (pffi-pointer-get array-pointer
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type
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offset))))))))
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(looper 0 (list)))))
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(define pffi-array-allocate
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(lambda (type size)
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(array-make type size (pffi-pointer-allocate-calloc size (c-size-of type)))))
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(define pffi-array-get
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(lambda (array index)
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(let ((type (pffi-array-type array)))
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(pffi-pointer-get (pffi-array-pointer array)
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type
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(* (c-size-of type) index)))))
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(define pffi-array-set!
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(lambda (array index value)
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(let ((type (pffi-array-type array)))
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(pffi-pointer-set! (pffi-array-pointer array)
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type
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(* (c-size-of type) index)
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value))))
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