1 files changed, 31 insertions, 7 deletions

diff --git a/common/zlib.h b/common/zlib.h
index 1354134816..5fd13e842d 100644
--- a/common/zlib.h
+++ b/common/zlib.h
@@ -8,29 +8,31 @@
  * modify it under the terms of the GNU General Public License
  * as published by the Free Software Foundation; either version 2
  * of the License, or (at your option) any later version.
- *
+
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
- *
+
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  *
  * $URL$
  * $Id$
+ *
  */
 
 #ifndef COMMON_ZLIB_H
 #define COMMON_ZLIB_H
 
 #include "common/scummsys.h"
-
-#if defined(USE_ZLIB)
+#include "common/stream.h"
 
 namespace Common {
 
+#if defined(USE_ZLIB)
+
 /**
  * Thin wrapper around zlib's uncompress() function. This wrapper makes
  * it possible to uncompress data in engines without being forced to link
@@ -40,9 +42,31 @@ namespace Common {
  */
 bool uncompress(byte *dst, unsigned long *dstLen, const byte *src, unsigned long srcLen);
 
-} // end of namespace Common
-
 #endif
 
-#endif
+/**
+ * Take an arbitrary SeekableReadStream and wrap it in a custom stream which
+ * provides transparent on-the-fly decompression. Assumes the data it
+ * retrieves from the wrapped stream to be either uncompressed or in gzip
+ * format. In the former case, the original stream is returned unmodified
+ * (and in particular, not wrapped).
+ *
+ * It is safe to call this with a NULL parameter (in this case, NULL is
+ * returned).
+ */
+Common::SeekableReadStream *wrapCompressedReadStream(Common::SeekableReadStream *toBeWrapped);
+
+/**
+ * Take an arbitrary WriteStream and wrap it in a custom stream which provides
+ * transparent on-the-fly compression. The compressed data is written in the
+ * gzip format, unless ZLIB support has been disabled, in which case the given
+ * stream is returned unmodified (and in particular, not wrapped).
+ *
+ * It is safe to call this with a NULL parameter (in this case, NULL is
+ * returned).
+ */
+Common::WriteStream *wrapCompressedWriteStream(Common::WriteStream *toBeWrapped);
 
+}	// End of namespace Common
+
+#endif