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diff -ur libmng-orig/libmng_zlib.c libmng-1.0.10/libmng_zlib.c
--- libmng_zlib.c 2005-12-15 00:53:13.000000000 +0100
+++ libmng_zlib.c 2007-07-19 13:17:44.000000000 +0200
@@ -162,6 +162,9 @@
#ifdef MNG_SUPPORT_TRACE
MNG_TRACE (pData, MNG_FN_ZLIB_INFLATEINIT, MNG_LC_START);
#endif
+
+ if (pData->bInflating) /* free the old zlib structures */
+ inflateEnd(&pData->sZlib);
/* initialize zlib structures and such */
iZrslt = inflateInit (&pData->sZlib);
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