1 ;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10 -*-
2 ;;;; *************************************************************************
3 ;;;; FILE IDENTIFICATION
5 ;;;; Name: compress.lisp
6 ;;;; Purpose: UFFI Example file for zlib compression
7 ;;;; Author: Kevin M. Rosenberg
8 ;;;; Date Started: Feb 2002
12 ;;;; This file, part of UFFI, is Copyright (c) 2002-2005 by Kevin M. Rosenberg
14 ;;;; *************************************************************************
16 (in-package #:uffi-tests)
18 (uffi:def-function ("compress" c-compress)
19 ((dest (* :unsigned-char))
26 (defun compress (source)
27 "Returns two values: array of bytes containing the compressed data
28 and the numbe of compressed bytes"
29 (let* ((sourcelen (length source))
30 (destsize (+ 12 (ceiling (* sourcelen 1.01))))
31 (dest (uffi:allocate-foreign-string destsize :unsigned t))
32 (destlen (uffi:allocate-foreign-object :long)))
33 (setf (uffi:deref-pointer destlen :long) destsize)
34 (uffi:with-cstring (source-native source)
35 (let ((result (c-compress dest destlen source-native sourcelen))
36 (newdestlen (uffi:deref-pointer destlen :long)))
39 (values (uffi:convert-from-foreign-usb8
42 (error "zlib error, code ~D" result))
44 (uffi:free-foreign-object destlen)
45 (uffi:free-foreign-object dest)))))))
47 (uffi:def-function ("uncompress" c-uncompress)
48 ((dest (* :unsigned-char))
55 (defun uncompress (source)
56 (let* ((sourcelen (length source))
57 (destsize 200000) ;adjust as needed
58 (dest (uffi:allocate-foreign-string destsize :unsigned t))
59 (destlen (uffi:allocate-foreign-object :long)))
60 (setf (uffi:deref-pointer destlen :long) destsize)
61 (uffi:with-cstring (source-native source)
62 (let ((result (c-uncompress dest destlen source-native sourcelen))
63 (newdestlen (uffi:deref-pointer destlen :long)))
66 (uffi:convert-from-foreign-string
69 :null-terminated-p nil)
70 (error "zlib error, code ~D" result))
72 (uffi:free-foreign-object destlen)
73 (uffi:free-foreign-object dest)))))))
75 (deftest :compress.1 (compress "")
76 #(120 156 3 0 0 0 0 1) 8)
77 (deftest :compress.2 (compress "test")
78 #(120 156 43 73 45 46 1 0 4 93 1 193) 12)
79 (deftest :compress.3 (compress "test2")
80 #(120 156 43 73 45 46 49 2 0 6 80 1 243) 13)
82 (defun compress-uncompress (str)
83 (multiple-value-bind (compressed len) (compress str)
84 (declare (ignore len))
85 (multiple-value-bind (uncompressed len2) (uncompress compressed)
86 (declare (ignore len2))
90 (deftest :uncompress.1 "" "")
91 (deftest :uncompress.2 "test" "test")
92 (deftest :uncompress.3 "test2" "test2")