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diff --git a/src/os_zlib/os_zlib.h b/src/os_zlib/os_zlib.h
index 1f84568..24b992f 100755
--- a/src/os_zlib/os_zlib.h
+++ b/src/os_zlib/os_zlib.h
@@ -1,26 +1,40 @@
-/* @(#) $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);
+/**
+ * @brief Compress a string with zlib.
+ * @param[in] src the source string to compress
+ * @param[out] dst the destination buffer for the compressed string, will be null-terminated on success
+ * @param[in] src_size the length of the source string
+ * @param[in] dst_size the size of the destination buffer
+ * @return 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);
+/**
+ * @brief Uncompress a string with zlib.
+ * @param[in] src the source string to uncompress
+ * @param[out] dst the destination buffer for the uncompressed string, will be null-terminated on success
+ * @param[in] src_size the length of the source string
+ * @param[in] dst_size the size of the destination buffer
+ * @return 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 */