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 1.12 2003/08/13 18:53:42 kevin Exp $
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12 ;;;; This file, part of UFFI, is Copyright (c) 2002-2003 by Kevin M. Rosenberg
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14 ;;;; *************************************************************************
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16 (in-package #:uffi-tests)
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18 (uffi:def-function ("compress" c-compress)
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19 ((dest (* :unsigned-char))
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26 (defun compress (source)
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27 "Returns two values: array of bytes containing the compressed data
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28 and the numbe of compressed bytes"
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29 (let* ((sourcelen (length source))
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30 (destsize (+ 12 (ceiling (* sourcelen 1.01))))
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31 (dest (uffi:allocate-foreign-string destsize :unsigned t))
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32 (destlen (uffi:allocate-foreign-object :long)))
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33 (setf (uffi:deref-pointer destlen :long) destsize)
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34 (uffi:with-cstring (source-native source)
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35 (let ((result (c-compress dest destlen source-native sourcelen))
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36 (newdestlen (uffi:deref-pointer destlen :long)))
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39 (values (uffi:convert-from-foreign-string
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42 :null-terminated-p nil)
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44 (error "zlib error, code ~D" result))
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46 (uffi:free-foreign-object destlen)
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47 (uffi:free-foreign-object dest)))))))
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49 (uffi:def-function ("uncompress" c-uncompress)
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50 ((dest (* :unsigned-char))
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57 (defun uncompress (source)
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58 (let* ((sourcelen (length source))
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59 (destsize 200000) ;adjust as needed
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60 (dest (uffi:allocate-foreign-string destsize :unsigned t))
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61 (destlen (uffi:allocate-foreign-object :long)))
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62 (setf (uffi:deref-pointer destlen :long) destsize)
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63 (uffi:with-cstring (source-native source)
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64 (let ((result (c-uncompress dest destlen source-native sourcelen))
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65 (newdestlen (uffi:deref-pointer destlen :long)))
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68 (uffi:convert-from-foreign-string
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71 :null-terminated-p nil)
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72 (error "zlib error, code ~D" result))
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74 (uffi:free-foreign-object destlen)
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75 (uffi:free-foreign-object dest)))))))
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77 (deftest compress.1 (map 'list #'char-code (compress ""))
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78 (120 156 3 0 0 0 0 1))
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79 (deftest compress.2 (map 'list #'char-code (compress "test"))
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80 (120 156 43 73 45 46 1 0 4 93 1 193))
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81 (deftest compress.3 (map 'list #'char-code (compress "test2"))
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82 (120 156 43 73 45 46 49 2 0 6 80 1 243))
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84 (defun compress-uncompress (str)
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85 (multiple-value-bind (compressed len) (compress str)
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86 (declare (ignore len))
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87 (multiple-value-bind (uncompressed len2) (uncompress compressed)
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88 (declare (ignore len2))
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92 (deftest uncompress.1 "" "")
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93 (deftest uncompress.2 "test" "test")
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94 (deftest uncompress.3 "test2" "test2")
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