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diff --git a/src/os_zlib/os_zlib.h b/src/os_zlib/os_zlib.h
old mode 100755
new mode 100644
index 1f84568..9c3303e
--- a/src/os_zlib/os_zlib.h
+++ b/src/os_zlib/os_zlib.h
@@ -1,26 +1,38 @@
-/* @(#) $Id: os_zlib.h,v 1.5 2009/06/24 18:53:06 dcid Exp $ */
-
 /* Copyright (C) 2009 Trend Micro Inc.
  * All rights reserved.
  *
  * This program is a free software; you can redistribute it
  * and/or modify it under the terms of the GNU General Public
- * License (version 3) as published by the FSF - Free Software
+ * License (version 2) as published by the FSF - Free Software
  * Foundation
  */
-       
 
 #ifndef __OS_ZLIB_H
 #define __OS_ZLIB_H
 
-#include "zlib.h"
-
-/* os_compress: Compress a string with zlib. */
-int os_compress(char *src, char *dst, int src_size, int dst_size);
+/* Compress a string with zlib
+ * src: the source string to compress
+ * dst: the destination buffer for the compressed string, will be
+ *      null-terminated on success
+ * src_size: the length of the source string
+ * dst_size: the size of the destination buffer
+ * Returns 0 on failure, else the length of the compressed string
+ */
+unsigned long int os_zlib_compress(const char *src, char *dst,
+                                   unsigned long int src_size,
+                                   unsigned long int dst_size);
 
-/* os_uncompress: Uncompress a string with zlib. */
-int os_uncompress(char *src, char *dst, int src_size, int dst_size);
+/* Uncompress a string with zlib
+ * src: the source string to uncompress
+ * dst: the destination buffer for the uncompressed string, will be
+ *      null-terminated on success
+ * src_size: the length of the source string
+ * dst_size: the size of the destination buffer
+ * Returns 0 on failure, else the length of the uncompressed string
+ */
+unsigned long int os_zlib_uncompress(const char *src, char *dst,
+                                     unsigned long int src_size,
+                                     unsigned long int dst_size);
 
-#endif
+#endif /* __OS_ZLIB_H */
 
-/* EOF */