Add undocumented inflateResetKeep() function for CAB file decoding.

The Microsoft CAB file format compresses each block with completed
deflate streams that depend on the sliding window history of the
previous block in order to decode.  inflateResetKeep() does what
inflateReset() does, except the sliding window history from the
previous inflate operation is retained.

1 files changed, 1 insertions, 0 deletions

diff --git a/zlib.h b/zlib.h
index 96c2c14..99cd058 100644
--- a/zlib.h
+++ b/zlib.h
@@ -1687,6 +1687,7 @@ ZEXTERN const char   * ZEXPORT zError           OF((int));
 ZEXTERN int            ZEXPORT inflateSyncPoint OF((z_streamp));
 ZEXTERN const uLongf * ZEXPORT get_crc_table    OF((void));
 ZEXTERN int            ZEXPORT inflateUndermine OF((z_streamp, int));
+ZEXTERN int            ZEXPORT inflateResetKeep OF((z_streamp));
 #ifndef Z_SOLO
   ZEXTERN unsigned long  ZEXPORT gzflags          OF((void));
 #endif