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;;; lolevel.scm: low level access utility
;;;
;;; Copyright (c) 2009-2012 uim Project http://code.google.com/p/uim/
;;;
;;; All rights reserved.
;;;
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;; 1. Redistributions of source code must retain the above copyright
;;; notice, this list of conditions and the following disclaimer.
;;; 2. Redistributions in binary form must reproduce the above copyright
;;; notice, this list of conditions and the following disclaimer in the
;;; documentation and/or other materials provided with the distribution.
;;; 3. Neither the name of authors nor the names of its contributors
;;; may be used to endorse or promote products derived from this software
;;; without specific prior written permission.
;;;
;;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
;;; ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
;;; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
;;; ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE
;;; FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
;;; OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
;;; HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
;;; LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
;;; OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
;;; SUCH DAMAGE.
;;;;
(use srfi-1)
(require-dynlib "lolevel")
(define (u8list-pack fmt . args)
(apply append
(map (lambda (f)
(cond ((eq? (car f) 'u8)
(list (cadr f)))
((eq? (car f) 'u16)
(u16->u8list (cadr f)))
((eq? (car f) 'u32)
(u32->u8list (cadr f)))
((eq? (car f) 's8)
(string->u8list (cadr f)))
((eq? (car f) 's16)
(append (string->u8list (cadr f)) '(0))) ;; XXX
((eq? (car f) 'u8list)
(cadr f))
((eq? (car f) 'u16list)
(apply append (map (lambda (x) (u16->u8list x)) (cadr f))))
(else
(uim-notify-fatal (N_ "unknown byte operator")))))
(zip fmt args))))
(define (u8list-unpack fmt arg)
(let loop ((fmt fmt)
(arg arg)
(rest '()))
(define (call-with-n-byte n thunk)
(receive (h t) (split-at arg n)
(loop (cdr fmt) t (cons (thunk h) rest))))
(cond ((null? fmt)
(reverse rest))
((eq? 'u8 (car fmt))
(call-with-n-byte 1 car))
((eq? 'u16 (car fmt))
(call-with-n-byte 2 u8list->u16))
((eq? 'u32 (car fmt))
(call-with-n-byte 4 u8list->u32))
((eq? 's8 (car fmt))
(let ((ret (take-while (lambda (x) (not (= x 0))) arg)))
(loop (cdr fmt)
(drop arg (+ 1 (length ret)))
(cons (list->string (map integer->char ret)) rest))))
((eq? 's16 (car fmt))
(let ((ret (take-while (lambda (x) (not (= x 0))) arg)))
(loop (cdr fmt)
(drop arg (+ 2 (length ret))) ;; XXX
(cons (list->string (map integer->char ret)) rest))))
((eq? 'u8list (car fmt))
(loop (cdr fmt) '() (cons arg rest)))
(else
(uim-notify-fatal (N_ "unknown byte operator"))))))
(define (call-with-u8list-unpack fmt arg thunk)
(apply thunk (u8list-unpack fmt arg)))
(define (u8list->string-buf l)
(map integer->char l))
(define (string-buf->u8list l)
(map char->integer l))
(define (call-jit ret l args)
(and-let* ((anon-flag (or (assq-cdr '$MAP_ANONYMOUS (mmap-flags?))
(assq-cdr '$MAP_ANON (mmap-flags?))))
(function-pointer (u8list->pointer l))
(mapped (mmap function-pointer (length l)
(cons (assq-cdr '$PROT_EXEC (mmap-prot-flags?))
anon-flag)
-1
0))
(ret (ffi-call ret function-pointer args)))
(munmap mapped (length l))
(free function-pointer)
ret))
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