1 ;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10 -*-
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2 ;;;; *************************************************************************
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3 ;;;; FILE IDENTIFICATION
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5 ;;;; Name: compress.lisp
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6 ;;;; Purpose: UFFI Example file for zlib compression
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7 ;;;; Author: Kevin M. Rosenberg
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8 ;;;; Date Started: Feb 2002
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10 ;;;; $Id: compress.lisp,v 1.11 2003/05/02 02:50:12 kevin Exp $
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12 ;;;; This file, part of UFFI, is Copyright (c) 2002 by Kevin M. Rosenberg
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14 ;;;; UFFI users are granted the rights to distribute and use this software
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15 ;;;; as governed by the terms of the Lisp Lesser GNU Public License
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16 ;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
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17 ;;;; *************************************************************************
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19 (in-package :uffi-tests)
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21 (uffi:def-function ("compress" c-compress)
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22 ((dest (* :unsigned-char))
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29 (defun compress (source)
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30 "Returns two values: array of bytes containing the compressed data
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31 and the numbe of compressed bytes"
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32 (let* ((sourcelen (length source))
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33 (destsize (+ 12 (ceiling (* sourcelen 1.01))))
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34 (dest (uffi:allocate-foreign-string destsize :unsigned t))
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35 (destlen (uffi:allocate-foreign-object :long)))
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36 (setf (uffi:deref-pointer destlen :long) destsize)
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37 (uffi:with-cstring (source-native source)
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38 (let ((result (c-compress dest destlen source-native sourcelen))
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39 (newdestlen (uffi:deref-pointer destlen :long)))
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42 (values (uffi:convert-from-foreign-string
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45 :null-terminated-p nil)
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47 (error "zlib error, code ~D" result))
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49 (uffi:free-foreign-object destlen)
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50 (uffi:free-foreign-object dest)))))))
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52 (uffi:def-function ("uncompress" c-uncompress)
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53 ((dest (* :unsigned-char))
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60 (defun uncompress (source)
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61 (let* ((sourcelen (length source))
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62 (destsize 200000) ;adjust as needed
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63 (dest (uffi:allocate-foreign-string destsize :unsigned t))
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64 (destlen (uffi:allocate-foreign-object :long)))
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65 (setf (uffi:deref-pointer destlen :long) destsize)
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66 (uffi:with-cstring (source-native source)
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67 (let ((result (c-uncompress dest destlen source-native sourcelen))
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68 (newdestlen (uffi:deref-pointer destlen :long)))
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71 (uffi:convert-from-foreign-string
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74 :null-terminated-p nil)
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75 (error "zlib error, code ~D" result))
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77 (uffi:free-foreign-object destlen)
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78 (uffi:free-foreign-object dest)))))))
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80 (deftest compress.1 (map 'list #'char-code (compress ""))
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81 (120 156 3 0 0 0 0 1))
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82 (deftest compress.2 (map 'list #'char-code (compress "test"))
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83 (120 156 43 73 45 46 1 0 4 93 1 193))
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84 (deftest compress.3 (map 'list #'char-code (compress "test2"))
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85 (120 156 43 73 45 46 49 2 0 6 80 1 243))
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87 (defun compress-uncompress (str)
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88 (multiple-value-bind (compressed len) (compress str)
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89 (declare (ignore len))
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90 (multiple-value-bind (uncompressed len2) (uncompress compressed)
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91 (declare (ignore len2))
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95 (deftest uncompress.1 "" "")
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96 (deftest uncompress.2 "test" "test")
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97 (deftest uncompress.3 "test2" "test2")
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