;;;; Programmer: Kevin M. Rosenberg
;;;; Date Started: Feb 2002
;;;;
-;;;; $Id: compress.lisp,v 1.1 2002/09/30 10:02:36 kevin Exp $
+;;;; This file, part of UFFI, is Copyright (c) 2002-2010 by Kevin M. Rosenberg
;;;;
-;;;; This file, part of UFFI, is Copyright (c) 2002 by Kevin M. Rosenberg
-;;;;
-;;;; UFFI users are granted the rights to distribute and use this software
-;;;; as governed by the terms of the Lisp Lesser GNU Public License
-;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
;;;; *************************************************************************
(in-package :cl-user)
-(unless (uffi:load-foreign-library
- (uffi:find-foreign-library
- "libz"
- '("/usr/local/lib/" "/usr/lib/" "/zlib/")
- :types '("so" "a" "dylib"))
- :module "zlib"
- :supporting-libraries '("c"))
- (warn "Unable to load zlib"))
+(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))
(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)))
+ (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)))))))
+ (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)
- (format t "~&(compress ~S) => " str)
- (dotimes (i len)
- (format t "~X" (char-code (char compressed i))))
- (format t ",~D" len))))
+ (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