r3593: *** empty log message ***

[uffi.git] / examples / compress.lisp

diff --git a/examples/compress.lisp b/examples/compress.lisp
index e5140aea57b6d4b60988d5dd2cb670b7175142cc..1229be56e75ac1962099665ffb398786821cce6e 100644 (file)
--- a/examples/compress.lisp
+++ b/examples/compress.lisp
@@ -7,7 +7,7 @@
 ;;;; Programmer:    Kevin M. Rosenberg
 ;;;; Date Started:  Feb 2002
 ;;;;
-;;;; $Id: compress.lisp,v 1.2 2002/12/03 06:58:39 kevin Exp $
+;;;; $Id: compress.lisp,v 1.3 2002/12/09 16:30:20 kevin Exp $
 ;;;;
 ;;;; This file, part of UFFI, is Copyright (c) 2002 by Kevin M. Rosenberg
 ;;;;
@@ -63,6 +63,33 @@
            (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
@@ -76,6 +103,17 @@
     (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