From c65c196152e5fedd4be10ddbeae71edee1718287 Mon Sep 17 00:00:00 2001
From: "Ryan C. Gordon" <icculus@icculus.org>
Date: Fri, 17 Feb 2017 20:48:02 -0500
Subject: [PATCH] Fix bug with copying z_stream objects around in zip archiver
 (thanks, Andrei!).

zlib expects us to use inflateCopy() to move a z_stream, then inflateEnd()
the original, and apparently fails in later versions if you just try to
memcpy() it.

This is only a bug in the stable-2.0 and stable-1.0 branches; we replaced
zlib with miniz on the development branch, which doesn't have this
requirement (or an inflateCopy() function at all!).
(transplanted from 090cb9c74b87198e6d520afca9d649ca0d84669f)
---
 archivers/zip.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/archivers/zip.c b/archivers/zip.c
index 9eecb94..129b54a 100644
--- a/archivers/zip.c
+++ b/archivers/zip.c
@@ -368,7 +368,8 @@ static int ZIP_seek(FileHandle *handle, PHYSFS_uint64 offset)
                 return(0);
 
             inflateEnd(&finfo->stream);
-            memcpy(&finfo->stream, &str, sizeof (z_stream));
+            inflateCopy(&finfo->stream, &str);
+            inflateEnd(&str);
             finfo->uncompressed_position = finfo->compressed_position = 0;
         } /* if */