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;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10 -*-
;;;; *************************************************************************
;;;; FILE IDENTIFICATION
;;;;
;;;; Name: compress.cl
;;;; Purpose: UFFI Example file for zlib compression
;;;; Programmer: Kevin M. Rosenberg
;;;; Date Started: Feb 2002
;;;;
;;;; This file, part of UFFI, is Copyright (c) 2002-2010 by Kevin M. Rosenberg
;;;;
;;;; *************************************************************************
(in-package :cl-user)
(eval-when (:load-toplevel :execute)
(unless (uffi:load-foreign-library
#-(or macosx darwin)
(uffi:find-foreign-library
"libz"
'("/usr/local/lib/" "/usr/lib/" "/zlib/")
:types '("so" "a"))
#+(or macosx darwin)
(uffi:find-foreign-library "z"
`(,(pathname-directory *load-pathname*)))
:module "zlib"
:supporting-libraries '("c"))
(warn "Unable to load zlib")))
(uffi:def-function ("compress" c-compress)
((dest (* :unsigned-char))
(destlen (* :long))
(source :cstring)
(source-len :long))
:returning :int
:module "zlib")
(defun compress (source)
"Returns two values: array of bytes containing the compressed data
and the numbe of compressed bytes"
(let* ((sourcelen (length source))
(destsize (+ 12 (ceiling (* sourcelen 1.01))))
(dest (uffi:allocate-foreign-string destsize :unsigned t))
(destlen (uffi:allocate-foreign-object :long)))
(setf (uffi:deref-pointer destlen :long) destsize)
(uffi:with-cstring (source-native source)
(let ((result (c-compress dest destlen source-native sourcelen))
(newdestlen (uffi:deref-pointer destlen :long)))
(unwind-protect
(if (zerop result)
(values (uffi:convert-from-foreign-string
dest
:length newdestlen
:null-terminated-p nil)
newdestlen)
(error "zlib error, code ~D" result))
(progn
(uffi:free-foreign-object destlen)
(uffi:free-foreign-object dest)))))))
(uffi:def-function ("uncompress" c-uncompress)
((dest (* :unsigned-char))
(destlen (* :long))
(source :cstring)
(source-len :long))
:returning :int
:module "zlib")
(defun uncompress (source)
(let* ((sourcelen (length source))
(destsize 200000) ;adjust as needed
(dest (uffi:allocate-foreign-string destsize :unsigned t))
(destlen (uffi:allocate-foreign-object :long)))
(setf (uffi:deref-pointer destlen :long) destsize)
(uffi:with-cstring (source-native source)
(let ((result (c-uncompress dest destlen source-native sourcelen))
(newdestlen (uffi:deref-pointer destlen :long)))
(unwind-protect
(if (zerop result)
(uffi:convert-from-foreign-string
dest
:length newdestlen
:null-terminated-p nil)
(error "zlib error, code ~D" result))
(progn
(uffi:free-foreign-object destlen)
(uffi:free-foreign-object dest)))))))
#+examples-uffi
(progn
(flet ((print-results (str)
(multiple-value-bind (compressed len) (compress str)
(let ((*print-length* nil))
(format t "~&(compress ~S) => " str)
(format t "~S~%" (map 'list #'char-code compressed))))))
(print-results "")
(print-results "test")
(print-results "test2")))
#+test-uffi
(progn
(flet ((test-compress (str)
(multiple-value-bind (compressed len) (compress str)
(multiple-value-bind (uncompressed len2) (uncompress compressed)
(util.test:test str uncompressed :test #'string=
:fail-info "Error uncompressing a compressed string")))))
(test-compress "")
(test-compress "test")
(test-compress "test2")))
;; Results of the above on my system:
;; (compress "") => 789c300001,8
;; (compress "test") => 789c2b492d2e1045d1c1,12
;; (compress "test2") => 789c2b492d2e31206501f3,13
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