From e1948d520af3df173e33bc46087b1717215293dd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pedro=20J=2E=20Est=C3=A9banez?= <pedrojrulez@gmail.com>
Date: Mon, 13 Jun 2016 00:19:45 +0200
Subject: Zip-align exported APK

---
 core/io/unzip.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

(limited to 'core')

diff --git a/core/io/unzip.c b/core/io/unzip.c
index 78672677f9..7aa0a86d13 100644
--- a/core/io/unzip.c
+++ b/core/io/unzip.c
@@ -1031,10 +1031,19 @@ local int unz64local_GetCurrentFileInfoInternal (unzFile file,
 
         if (lSeek!=0)
         {
-            if (ZSEEK64(s->z_filefunc, s->filestream,lSeek,ZLIB_FILEFUNC_SEEK_CUR)==0)
-                lSeek=0;
-            else
-                err=UNZ_ERRNO;
+			if (lSeek<0) {
+				// WORKAROUND for backwards seeking
+				z_off_t pos = ZTELL64(s->z_filefunc, s->filestream);
+				if (ZSEEK64(s->z_filefunc, s->filestream,pos+lSeek,ZLIB_FILEFUNC_SEEK_SET)==0)
+					lSeek=0;
+				else
+					err=UNZ_ERRNO;
+			} else {
+				if (ZSEEK64(s->z_filefunc, s->filestream,lSeek,ZLIB_FILEFUNC_SEEK_CUR)==0)
+					lSeek=0;
+				else
+					err=UNZ_ERRNO;
+			}
         }
 
         while(acc < file_info.size_file_extra)
-- 
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