- (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-usb8
+ dest newdestlen)
+ 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)))))))
+
+(deftest :compress.1 (compress "")
+ #(120 156 3 0 0 0 0 1) 8)
+(deftest :compress.2 (compress "test")
+ #(120 156 43 73 45 46 1 0 4 93 1 193) 12)
+(deftest :compress.3 (compress "test2")
+ #(120 156 43 73 45 46 49 2 0 6 80 1 243) 13)